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⚛️ Physics — 45 Questions

Physics+4 / −1

A beam of light from a source L is incident normally on a plane mirror fixed at a certain distance x from the source. The beam is reflected back as a spot on a scale placed just above the source L. When the mirror is rotated through a small angle "q", the spot of the light is found to move through a distance y on the scale. The angle \(\theta\) is given by

\(\displaystyle \frac{\text{y}}{2\text{x}}\)

\(\displaystyle \frac{\text{y}}{\text{x}}\)

\(\displaystyle \frac{\text{x}}{2\text{y}}\)

\(\displaystyle \frac{\text{x}}{\text{y}}\)

Physics+4 / −1

A thin prism having refracting angle \(10^\circ\) is made of glass of refractive index 1.42. This prism is combined with another thin prismof glass of refractive index 1.7. This combination produces dispersion without deviation. The refracting angle of second prism should be

\(4^\circ\)

\(6^\circ\)

\(8^\circ\)

\(10^\circ\)

Physics+4 / −1

The acceleration due to gravity at a height 1 Km above the earth is the same as at a depth "d" below the surface of earth. Then

d = 1 km

d = 32 km

d = 2 km

d = 12 km

Physics+4 / −1

Two astronauts are floating in gravitational free space after having lost contact with their spaceship. The two will

move towards each other

move away from each other

will become stationary

keep floating at the same distance between them

Physics+4 / −1

Young’s double slit experiment is first performed in air and then in a medium other than air. It is found that 8th bright fringe in the medium lies where 5th dark fringe lies in air. The refractive index of the medium is nearly

1.25

1.59

1.69

1.78

Physics+4 / −1

A physical quantity of the dimensions of length that can be formed out of c, G and \(\displaystyle \frac{e^2}{4\pi \, \epsilon_0}\) is
[c is velocity of light, G is the universal constant of gravitation and e is charge]

Physics+4 / −1

The ratio of resolving powers of an optical microscope for two wavelengths \(\lambda_1 = 4000\,\mathring{A}\) and \(\lambda_2 = 6000\, \mathring{A}\) is

8 : 27

9 : 4

3 : 2

16 : 81

Physics+4 / −1

Two polaroids \(\text{P}_1\) and \( \text{P}_ 2\) are placed with their axis perpendicular to each other. Unpolarised light \(\text{I}_0\) is incident on \(\text{P}_1\) . A third polaroid \(\text{P}_3\) is kept in between \(\text{P}_1\) and \(\text{P}_2\) such that its axis makes an angle 45° with that of \(\text{P}_1\). The intensity of transmitted light through \(\text{P}_2\) is

\(\displaystyle \frac{I_0}{2}\)

\(\displaystyle \frac{I_0}{4}\)

\(\displaystyle \frac{I_0}{8}\)

\(\displaystyle \frac{I_0}{16}\)

Physics+4 / −1

Thermodynamic processes are indicated in the following diagram

Match the following:

\(P\rightarrow a\), \(Q\rightarrow c\), \(R\rightarrow d\), \(S\rightarrow b\)

\(P\rightarrow c\), \(Q\rightarrow a\), \(R\rightarrow d\), \(S\rightarrow b\)

\(P\rightarrow c\), \(Q\rightarrow d\), \(R\rightarrow b\), \(S\rightarrow a\)

\(P\rightarrow d\), \(Q\rightarrow b\), \(R\rightarrow a\), \(S\rightarrow c\)

Physics+4 / −1

A Carnot engine having an efficiency of 110 as heat engine, is used as a refrigerator. If the workdone on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

1 J

90 J

99 J

100 J

Physics+4 / −1

A gas mixture consists of 2 moles of \(O_2\) and 4 moles of \(A_r\) at temperature T. Neglecting all vibrational modes, the total internal energy of the system is

4 RT

15 RT

9 RT

11 RT

Physics+4 / −1

The de-Broglie wavelength of a neutron in thermal equilibrium with heavy water at a temperature T (kelvin) and mass m, is

\(\displaystyle \frac{h}{\sqrt{3mkT}}\)

\(\displaystyle \frac{2h}{\sqrt{3mkT}}\)

\(\displaystyle \frac{2h}{\sqrt{mkT}}\)

\(\displaystyle \frac{h}{\sqrt{mkT}}\)

Physics+4 / −1

The photoelectric threshold wavelength of silver is \(3250 \times 10^{−10}\,m\). The velocity of the electron ejected from a silver surface by ultraviolet light of wavelength \(2536 \times 10^{−10}\,m\) is
[Given: \(h \,=\, 4.14 \times 10^{−15}\, \text{eVs}\) and \(c \,=\, 3 \times 10^8\,ms^{−1}\)]

\(\approx 0.6 \times 10^6\,ms^{−1}\)

\(\approx 61 \times 10^3\,ms^{−1}\)

\(\approx 0.3 \times 10^6\,ms^{−1}\)

\(\approx 6 \times 10^5\,ms^{−1}\)

Physics+4 / −1

Suppose the charge of a proton and an electron differ slightly. One of them is \(−e\) and the other is \(\left(e + \Delta e\right)\). If the net of electrostatic force and gravitational force between two hydrogen atoms placed at a distance d (much greater than atomic size) apart is zero, then \(\Delta e\) is of the order [Given mass of hydrogen, \(m_h =1.67 × 10^{−27} kg\)]

\(10^{-20} \,C\)

\(10^{-23} \,C\)

\(10^{-37} \,C\)

\(10^{-47} \,C\)

Physics+4 / −1

Two rods \(A\) and \(B\) of different materials are welded together as shown infigure. Their thermal conductivities are \(K_1\) and \(K_2\) The thermal conductivity of the composite rod will be

\(\displaystyle \frac{3\left(K_1 + K_2\right)}{2}\)

\(K_1 + K_2\)

\(2\left(K_1 + K_2\right)\)

\(\displaystyle \frac{K_1 + K_2}{2}\)

Physics+4 / −1

A spherical black body with a radius of \(12\, \text{cm}\) radiates \(450\, \text{watt}\) power at \(500\, \text{K}\). If the radius were halved and the temperature doubled, the power radiated in watt would be

\(450\)

\(1000\)

\(1800\)

\(225\)

Physics+4 / −1

The bulk modulus of a spherical object is \('B'\). If it is subjected to uniform pressure \('p'\) the fractional decrease in radius is

\(\displaystyle \frac{B}{3p}\)

\(\displaystyle \frac{3p}{B}\)

\(\displaystyle \frac{p}{3B}\)

\(\displaystyle \frac{P}{B}\)

Physics+4 / −1

In a common emitter transistor amplifier the audio signal voltage across the collector is 3 V. The resistance of collector is 3 KΩ. If current gain is 100 and the base resistance is 2 KΩ, the voltage and power gain of the amplifier is

15 and 200

150 and 15000

20 and 2000

200 and 1000

Physics+4 / −1

The given electrical network is equivalent to

OR gate

NOR gate

NOT gate

AND gate

Physics+4 / −1

Which one of the following represents forward bias diode?

Physics+4 / −1

A long solenoid of diameter 0.1 m has 2 × 10⁴ turns per metre. At the centre of the solenoid, a coil of 100 turns and radius 0.01 m is placed with its axis coinciding with the solenoid axis. The current in the solenoid reduces at a constant rate to 0 A from 4 A in 0.05 s. If the resistance of the coil is 10π²Ω, the total charge flowing through the coil during this time is

16 μC

32 μC

16 πμC

32 π μC

Physics+4 / −1

Figure shows a circuit that contains three identical resistors with resistance R = 9.0Ω each, two identical inductors with inductance L =2.0 mH each, and an ideal battery with emf ε = 18V . The current i through the battery just after the switch closed is

0.2 A

none of the above

0 A

2 mA

Physics+4 / −1

A U tube with both ends open to the atmosphere, is partially filled with water. Oil, which is immiscible with water, is poured into one side until it stands at a distance of 10mm above the water level on the other side. Mean while the water rises by 65 mm from its original level (see diagram). The density ofthe oil is

\(650\, \text{Kg}\,m^{ −3}\)

\(425\, \text{Kg} \,m^{−3}\)

\(800\, \text{Kg}\, m^{ −3}\)

\(928\, \text{Kg} \,m^{ −3}\)

Physics+4 / −1

A spring of force constant k is cut into lengths of ratio \(1 : 2 : 3\). They are connected in series and the new force constant is \(k'\).Then they are connected in parallel and force constant is \(k''\).Then \(k' : k''\) is

\(1 : 9\)

\(1 : 11\)

\(1 : 14\)

\(1 : 6\)

Physics+4 / −1

A particle executes linear simple harmonic motion with an amplitude of \(3\, \text{cm}\). When the particle is at \(2\, \text{cm}\) from the mean position, the magnitude of its velocity is equal to that of its acceleration. Then its time period in seconds is

\(\displaystyle \frac{\sqrt{5}}{2π}\)

\(\displaystyle \frac{4π}{\sqrt{5}}\)

\(\displaystyle \frac{2π}{\sqrt{3}}\)

\(\displaystyle \frac{\sqrt{5}}{π}\)

Physics+4 / −1

The ratio of wavelengths of the last line of Balmer series and the last line of Lyman series is

0.5

Physics+4 / −1

Radioactive material A has decay constant \(8 \lambda\) and material B has decay constant \(\lambda\). Initially, they have same number of nuclei. After what time, the ratio of number of nuclei of material B to that A will be \(\frac{1}{e}\) ?

\(\displaystyle \frac{1}{\lambda}\)

\(\displaystyle \frac{1}{7 \lambda}\)

\(\displaystyle \frac{1}{8\lambda}\)

\(\displaystyle \frac{1}{9\lambda}\)

Physics+4 / −1

The two nearest harmonics of a tube closed at one end and open at other end are \(220\, Hz\) and \(260\, Hz\). What is the fundamental frequency of the system?

\(20\, Hz\)

\(30\, Hz\)

\(40\, Hz\)

\(10\,Hz\)

Physics+4 / −1

Two cars moving in opposite directions approach each other with speed of \(22\,ms^{−1}\) and \(16.5\,ms^{−1}\) respectively. The driver of the first car blows a horn having a frequency \(400\, Hz\). The frequency heard by the driver of the second car is [velocity of sound is \(340\,ms^{−1}\)]

\(361\, Hz\)

\(411\, Hz\)

\(448\, Hz\)

\(350\, Hz\)

Physics+4 / −1

A capacitor is charged by a battery. The battery is removed and another identical uncharged capacitor is connected in parallel. The total electrostatic energy of resulting system

decreases by a factor of 2

remains the same

increases by a factor of 2

increases by a factor of 4

Physics+4 / −1

The diagrams below show regions of equipotential. A positive charge is moved from A to B in each diagram.

In all the four cases the work done is the same.

Minimum work is required to move q in figure (I)

Maximum work is required to move q in figure (II)

Maximum work is required to move q in figure (III)

Physics+4 / −1

One end of string of length \(l\) is connected to a particle of mass \('m'\) and the other end is connected to a small peg on a smooth horizontal table.If the particle moves in circle with speed 'V' , the net force on the particle (directed towards center) will be (T represents the tension in the string)

\(\displaystyle T\, +\, \frac{mv^2}{l}\)

\(\displaystyle T\, -\, \frac{mv^2}{l}\)

zero

\(T\)

Physics+4 / −1

If \(θ_1\) and \(θ_2\) be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip \(\theta\) is given by

\(tan^2θ = tan^2θ_1 + tan^2θ_2\)

\(cot^2θ = cot^2θ_1 − cot^2θ_2\)

\(tan^2θ = tan^2θ_1 − tan^2θ_2\)

\(cot^2θ = cot^ 2θ_1 + cot^2θ_2\)

Physics+4 / −1

A 250 turn rectangular coil of length 2.1 cm and width 1.25 cm carries a current of 85 µA and subjected to a magnetic field of strength 0.85 T. Work done for rotating the coil by 180° against the torque is

4.55 µJ

2.3 µJ

1.15 µJ

9.1 µJ

Physics+4 / −1

The resistance of a wire is 'R' ohm. If it is melted and stretched to 'n'times its original length, its new resistance will be

\(\displaystyle \frac{R}{M}\)

\(\displaystyle n^2\,R\)

\(\displaystyle \frac{R}{n^2}\)

\(nR\)

Physics+4 / −1

A potentiometer is an accurate and versatile device to make electrical measurements of EMF because the method involves

potential gradients

a condition of no current flow through the galvanometer

a combination of cells, galvanometer and resistances

cells

Physics+4 / −1

In an electromagnetic wave in free space the root mean square value of the electric field is \(E_{rms}\,=\, 6V m^{−1}\).The peak value of the magnetic field is

\(2.83 \times 10^{−8}\,T\)

\(0.70 \times 10^{−8}\,T\)

\(4.23 \times 10^{−8}\,T\)

\(1.41 \times 10^{−8}\,T\)

Physics+4 / −1

An arrangement of three parallel straight wires placed perpendicular to plane of paper carrying same current I along the same direction as shown in figure. Magnitude of force per unit length on the middle wire ‘B’ is given by

\(\displaystyle\frac{2µ_0I^2}{πd}\)

\(\displaystyle\frac{µ_0I^2}{\sqrt{2}πd}\)

\(\displaystyle\frac{µ_0I^2}{2πd}\)

Physics+4 / −1

Consider a drop of rain water having mass 1 g falling from a height of 1km. It hits the ground with a speed of 50ms⁻¹. Take 'g' constant with a value 10ms⁻².The work done by the (i) gravitational force and the (ii) resistive force of air is

(i) 1.25 J (ii) -8.25 J

(i) 100 J (ii) 8.75 J

(i) 10 J (ii) -8.75 J

(i) -10 J (ii) -8.25 J

Physics+4 / −1

A rope is wound around a hollow cylinder of mass 3 kg and radius 40 cm. What is the angular acceleration of the cylinder if the rope is pulled with a force of 30 N?

\(0.25\, \text{rad}\, s^{−2}\)

\(25\, \text{rad}\, s^{−2}\)

\(5\, m\,s^{−2}\)

\(25\, m\,s^{−2}\)

Physics+4 / −1

Two discs of same moment of inertia rotating about their regular axis passing through centre and perpendicular to the plane of disc with angular velocities ω₁ and ω₂.They are brought into contact face to face coinciding the axis of rotation. The expression for loss of energy during this process is

\(\displaystyle \frac{1}{4} I \left(ω_1 − ω_2\right)^2\)

\(\displaystyle I \left(ω_1 − ω_2\right)^2\)

\(\displaystyle \frac{1}{8} I \left(ω_1 − ω_2\right)^2\)

\(\displaystyle \frac{1}{2} I \left(ω_1 + ω_2\right)^2\)

Physics+4 / −1

Which of the following statements are correct?
(1) Centre of mass of a body always coincides with the centre of gravity of the body.
(2) Centre of mass of a body is the point at which the total gravitational torque on the body is zero.
(3) A couple on a body produces both transnational and rotational motion in a body.
(4) Mechanical advantage greater than one means that small effort can be used to lift a large load.

(1) and (2)

(2) and (3)

(3) and (4)

none of the above

Physics+4 / −1

Preeti reached the metro station and found that the escalator was not working. She walked up the stationary escalator in time \(t_1\). On other days, if she remains stationary on the moving escalator, then the escalator takes her up in time \(t_2\). The time taken by her to walk up on the moving escalator will be

\(\displaystyle \frac{t_1\,t_2}{t_2\,-\,t_1}\)

\(\displaystyle \frac{t_1\,t_2}{t_2\,+\,t_1}\)

\(t_1\,-\,t_2\)

\(\displaystyle \frac{t_1\,+\,t_2}{2}\)

Physics+4 / −1

The x and y coordinates of the particle at any time are x = 5t − 2\(t^2 \) and y = 10t respectively, where x and y are in meters and t in seconds. The acceleration of the particle at t = 2 s

\(\displaystyle 5 \, \frac{m}{s^2}\)

\(\displaystyle - 4 \, \frac{m}{s^2} \)

\(\displaystyle -8 \, \frac{m}{s^2}\)

\(0\)

Physics+4 / −1

Two blocks A and B of masses 3m and m respectively are connected by a mass-less and in extensible string. The whole system is suspended by a mass-less spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut are, respectively

\(\displaystyle \frac{g}{3}\), \(g\)

\(g\), \(g\)

\(\displaystyle \frac{g}{3}\), \(\displaystyle \frac{g}{3}\)

\(g\), \(\displaystyle \frac{g}{3}\)

🧪 Chemistry — 45 Questions

Chemistry+4 / −1

The equilibrium constants of the following are:
N₂ + 3H₂ \(\rightleftharpoons\) 2NH₃ ------ K₁
N₂ + O₂ \(\rightleftharpoons\) 2NO ------ K₂
H₂ + \(\frac{\text{1}}{\text{2}}\)O₂ \(\rightarrow \) H₂O ------ K₃
The equilibrium constant (K) of the reaction:
2NH₃ + \(\frac{\text{5}}{\text{2}}\)O₂ \(\rightleftharpoons\) 2NO + 3H₂O, will be

\(\text{K}_2^3\, \text{K}_3\)/\(\text{K}_1\)

\(\text{K}_1\, \text{K}_3^3\)/\(\text{K}_2\)

\(\text{K}_2\, \text{K}_3^3\)/\(\text{K}_1\)

\(\text{K}_2\, \text{K}_3\)/\(\text{K}_1\)

Chemistry+4 / −1

The heating of phenyl-methyl ethers with HI produces

benzene

ethyl chlorides

iodobenzene

phenol

Chemistry+4 / −1

The most suitable method of separation of 1 : 1 mixture of ortho and para-nitrophenols is

steam distillation

sublimation

chromatography

crystallization

Chemistry+4 / −1

Predict the correct intermediate and product in the following reaction

Chemistry+4 / −1

Which of the following reactions is appropriate for converting acetamide to methanamine ?

Gabriels phthalimide synthesis

Carbylamine reaction

Hoffmann hypobromamide reaction

Stephens reaction

Chemistry+4 / −1

The IUPAC name of the compound is

3-keto-2-methylhex-5-enal

3-keto-2-methylhex-4-enal

5-formylhex-2-en-3-one

5-methyl-4-oxohex-2-en-5-al

Chemistry+4 / −1

Which of the following is a sink for CO?

Plants

Haemoglobin

Micro-organisms present in the soil

Oceans

Chemistry+4 / −1

Of the following, which is the product formed when cyclohexanone undergoes aldol condensation followed by heating ?

Chemistry+4 / −1

Which of the following pair of compounds is isoelectronic and isostructural ?

IF₃ , XeF₂

BeCl₂, XeF₂

Tel₂, XeF₂

IBr₂^- , XeF₂

Chemistry+4 / −1

Consider the reaction

Identify A, X, Y, and Z

A-Ethanol, X-Acetaldehyde, Y-Butanone, Z-Hydrazone

A-Methoxymethane, X-Ethanoic acid, Y-Acetate ion, Z-hydrazine

A-Methoxymethane, X-Ethanol, Y-Ethanoic acid, Z-Semicarbazide

A-Ethanal, X-Ethanol, Y-But-2-enal, Z-Semicarbazone

Chemistry+4 / −1

Which one is the most acidic compound ?

Chemistry+4 / −1

Name the gas that can readily decolourizes acidified KMnO₄ solution.

P₂O₅

CO₂

SO₂

NO₂

Chemistry+4 / −1

Which one is the correct order of acidity ?

CH₃ – CH₃ > CH₂ = CH₂ > CH₃ –C ≡ CH > CH ≡ CH

CH₂ = CH₂ > CH₃ – CH = CH₂ > CH₃ – C ≡ CH

CH ≡ CH > CH₃ – C ≡ CH > CH₂ = CH₂ > CH_{3 –} - CH₃

CH ≡ CH > CH₂ = CH₂ > CH₃ – C ≡ CH > CH₃ – CH₃

Chemistry+4 / −1

Concentration of the Ag+ ions in a saturated solution of Ag₂C₂O₄ is 2.2 × 10^–4mol L^–1. Solubility product of Ag₂C₂O₄ is

5.3 × 10^–12

2.42 × 10^–8

2.66 × 10^–12

4.5 × 10^–11

Chemistry+4 / −1

With respect to the conformers of ethane, which of the following statements is true ?

Both bond angles and bond length remains same.

Bond angle remains same but bond length changes.

Bond angle changes but bond length remains same.

Both bond angle and bond length change.

Chemistry+4 / −1

The correct statement regarding electrophile is

Electrophile can be either neutral or positively charged species and can form a bond by accepting a pair of electrons from a nucleophile.

Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from a nucleophile

Electrophile is a negatively charged species and can form a bond by accepting a pair of electrons from another electro-phile

Electrophiles are generally neutral species and can form a bond by accepting a pair of electrons from a nucleophile

Chemistry+4 / −1

Which one is the wrong statement ?

The energy of 2s orbital is less than the energy of 2p orbital in case of Hydrogen like atoms.

de-Broglie's wavelength is given by \(\lambda\,=\,\frac{\text{h}}{\text{mv}}\)
where m = mass of the particle, v = group velocity of the particle.

The uncertainty principle is \(\Delta \text{E} \times \Delta \text{t}\) ≥ \(\frac{\text{h}}{\text{4} \pi\)

Half-filled and fully filled orbitals have greater stability due to greater exchange energy, greater symmetry and more balanced arrangement.

Chemistry+4 / −1

Correct increasing order for the wavelengths of absorption in the visible region for the complexes of Co³⁺ is

[Co(NH₃)₆ ]³⁺, [Co(en)₃]³⁺, [Co(H₂O)₆]³⁺

[Co(en)₃)]³⁺, [Co(NH₃)₆ ]³⁺, [Co(H₂O)₆]³⁺

[Co(H₂O)₆]³⁺, [Co(en)₃)]³⁺, [Co(NH₃)₆ ]³⁺

[Co(H₂O)₆]³⁺, [Co(NH₃)₆ ]³⁺, [Co(en)₃)]³⁺

Chemistry+4 / −1

Match the interhalogen compounds of column I with the geometry in column II and assign the correct code.

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

(a) - (iii), (b) - (i), (c) - (iv), (d) - (ii)

(a) - (v), (b) - (iv), (c) - (iii), (d) - (ii)

Chemistry+4 / −1

The species, having bond angles of 120° is

BCl₃

PH₃

ClF₃

NCl₃

Chemistry+4 / −1

The correct increasing order of basic strength for the following compounds is

II < I < III

II < III < I

III < I < II

III < II < I

Chemistry+4 / −1

A gas is allowed to expand in a well insulated container against a constant external pressure of 2.5 atm from an initial volume of 2.50 L to a final volume of 4.50 L. The change in internal energy \(\Delta \text{U}\) of the gas in joules will be

+505 J

1136.25 J

–500 J

–505 J

Chemistry+4 / −1

A 20 litre container at of 400 K contains CO₂(g) at pressure 0.4 atm and an excess SrO (neglect the volume of solid SrO). The volume of the containers is now decreased by moving the movable piston fitted in the container. The maximum volume of the container, when pressure of CO₂ attains its maximum value, will be
[Given : SrCO₃(s) \(\rightleftharpoons\) SrO(s) + CO₂ (g).
K = 1.6 atm]

2 litre

5 litre

10 litre

4 litre

Chemistry+4 / −1

Which of the following statements is not correct ?

Denaturation makes the proteins more active.

Insulin maintains sugar level in the blood of a human body.

Ovalbumin is a simple food reserve in egg-white.

Blood proteins thrombin and fibrinogen are involved in blood clotting.

Chemistry+4 / −1

Mechanism of a hypothetical reaction X₂ + Y₂ \(\rightarrow\) 2XY is given below:
(i) X₂ \(\rightarrow\) X + X (fast)
(ii) X + Y₂ \(\rightleftharpoons\) XY + Y (slow)
(iii) X + Y \(\rightarrow\) XY (fast)
The overall order of the reaction will be

1.5

Chemistry+4 / −1

In which pair of ions both the species contain S – S bond ?

\(\text{S}_4 O_6^{2-}\), \(\text{S}_2 O_7^{2-}\)

\(\text{S}_2 O_7^{2-}\), \(\text{S}_2 O_3^{2-}\)

\(\text{S}_4 O_6^{2-}\), \(\text{S}_2 O_3^{2-}\)

\(\text{S}_2 O_7^{2-}\), \(\text{S}_2 O_8^{2-}\)

Chemistry+4 / −1

Which one of the following pairs of species have the same bond order ?

N₂, O₂^–

CO, NO

O₂, NO⁺

CN^-, CO

Chemistry+4 / −1

Mixture of chloroxylenol and terpineol acts as

antibiotic.

analgesic.

antiseptic.

antipyretic.

Chemistry+4 / −1

It is because of inability of ns² electrons of the valence shell to participate in bonding that

Sn⁴⁺ is reducing while Pb⁴⁺ is oxidizing.

Sn²⁺ is reducing while Pb⁴⁺ is oxidizing.

Sn²⁺ is oxidizing while ⁴⁺is reducing.

Sn²⁺ and Pb²⁺ are both oxidising and reducing.

Chemistry+4 / −1

For a given reaction, \(\Delta \text{H}\) = 35.5 kJ mol^–1 and \(\Delta \text{S}\) = 83.6 JK^–1 mol^–1. The reaction is spontaneous at :
[Assume that \(\Delta \text{H}\) and \(\Delta \text{S}\) do not vary with temperature]

T > 298 K

T < 425 K

T > 425 K

All temperatures

Chemistry+4 / −1

If molality of the dilute solution is doubled, the value of molal depression constant (K_f ) will be

unchanged.

doubled.

halved.

tripled.

Chemistry+4 / −1

Which of the following is dependent on temperature ?

Weight percentage

Molality

Molarity

Mole fraction

Chemistry+4 / −1

Pick out the correct statement with respect to [Mn(CN)₆]^3–

It is dsp² hybridized and square planar.

It is sp³d² hybridized and octahedral.

It is sp³d² hybridized and tetrahedral.

It is d²sp³ hybridized and octahedral.

Chemistry+4 / −1

Which is the incorrect statement ?

Frenkel defect is favoured in those ionic compounds in which sizes of cation and anions are almost equal.

FeO_0.98 has non stoichiometric metal deficiency defect.

Density decreases in case of crystals with Schottky's defect.

NaCl(s) is insulator, silicon is semi-conductor, silver is conductor, quartz is piezo electric crystal.

Chemistry+4 / −1

HgCl₂ and I₂ both when dissolved in water containing I^- ions, the pair ofspecies formed is

Hg₂I₂, I^-

HgI₂, I₃^-

HgI₂, I^-

HgI₄^2-, I₃^-

Chemistry+4 / −1

Extraction of gold and silver involves leaching with CN^- ion. Silver is later recovered by

Displacement with Zn

Liquation

Distillation

Zone refining

Chemistry+4 / −1

The correct order of the stoichiometries of AgCl formed when AgNO₃ in excess istreated with the complexes:
CoCl₃.6NH₃, CoCl3.5NH₃, CoCl3 .4NH₃ respectively is

2 AgCl, 3 AgCl, 1 AgCl

1 AgCl, 3 AgCl, 2 AgCl

3 AgCl, 1 AgCl, 2 AgCl

3 AgCl, 2 AgCl, 1 AgCl

Chemistry+4 / −1

Identify A and predict the type of reaction

Chemistry+4 / −1

An example of a sigma bonded organometallic compound is

cobaltocene.

ruthenocene.

grignard's reagent.

ferrocene.

Chemistry+4 / −1

The reason for greater range of oxidation states in actinoids is attributed to

4f and 5d levels being close in energies.

the radioactive nature of actinoids.

actinoid contraction.

5f, 6d and 7s levels having comparable energies.

Chemistry+4 / −1

The element Z = 114 has been discovered recently. It will belong to which of the following family group and electronic configuration ?

Nitrogen family, [Rn] 5f¹⁴ 6d¹⁰7s²7p⁶

Halogen family, [Rn] 5f¹⁴ 6d¹⁰7s²7p⁵

Carbon family, [Rn] 5f¹⁴ 6d¹⁰7s²7p²

Oxygen family, [Rn] 5f¹⁴ 6d¹⁰7s²7p⁴

Chemistry+4 / −1

A first order reaction has a specific reaction rate of 10^-2 s^-1. How much time will it take for 20 g of the reactant to reduce to 5 g ?

693.0 second

238.6 second

138.6 second

346.5 second

Chemistry+4 / −1

Ionic mobility of which of the following alkali metal ions is lowest when aqueous solution of their salts are put under an electric field ?

Chemistry+4 / −1

In the electrochemical cell
Zn|ZnSO₄ (0.01M)| |CuSO₄(1.0 M)|Cu, the emf of this Daniel cell is E₁. When the concentration of ZnSO₄ is changed to 1.0 M and that of CuSO₄ changed to 0.01 M, the emf changes to E₂. From the following, which one is relationship between E₁ and E₂
(Given, \(\frac{\text{RT}}{\text{F}}\) = 0.059)

E₂ = 0 \(\neq\) E₁

E₁ = E₂

E₁ < E₂

E₁ > E₂

Chemistry+4 / −1

Which one of the following statements is not correct ?

Coenzymes increase the catalytic activity of enzyme.

Catalyst does not initiate any reaction.

The value of equilibrium constant is changed in the presence of a catalyst in the reaction at equilibrium.

Enzymes catalyze mainly bio-chemical reactions.

🧬 Biology — 90 Questions

Biology+4 / −1

The final proof for DNA as the genetic material came from the experiments of

Hargobind Khorana

Griffith

Hershey and Chase

Avery, Mcleod and McCarty

Biology+4 / −1

Spliceosomes are not found in cells of

bacteria.

plants.

fungi.

animals.

Biology+4 / −1

The pivot joint between atlas and axis is a type of

saddle joint.

fibrous joint.

cartilaginous joint.

synovial joint.

Biology+4 / −1

The association of histone H1 with a nucleosome indicates

the DNA double helix is exposed.

transcription is occurring.

DNA replication is occurring.

the DNA is condensed into a chromatin fibre.

Biology+4 / −1

Which of the following is made up of dead cells ?

Phloem

Xylem parenchyma

Collenchyma

Phellem

Biology+4 / −1

Select the correct route for the passage of sperms in male frogs

Testes → Vasa efferentia → Kidney → Bidder's canal → Urinogenital duct → Cloaca

Testes → Bidder's canal → Kidney → Vasa efferentia → Urinogenital duct → Cloaca

Testes → Vasa efferentia → Kidney → Seminal Vesicle → Urinogenital duct → Cloaca

Testes → Vasa efferentia → Bidder's canal → Ureter → Cloaca

Biology+4 / −1

Adult human RBC's are enucleate. Which of the following statement(s) is/are most appropriate explanation for this feature ?
(i) They do not need to reproduce
(ii) They are somatic cells
(iii) They do not metabolise
(iv) All their internal space is available for oxygen

(ii) and (iii)

Only (iv)

Only (i)

(i), (iii) and (iv)

Biology+4 / −1

Homozygous pure lines in cattle can be obtained by

mating of individuals of different species.

mating of related individuals of same breed.

mating of unrelated individuals of same breed.

mating of individuals of different breed.

Biology+4 / −1

A temporary endocrine gland in the human body is

corpus allatum.

pineal gland.

corpus cardiacum.

corpus luteum.

100

Biology+4 / −1

Viroids differ from viruses in having

RNA molecules without protein coat.

DNA molecules with protein coat.

DNA molecules without protein coat.

RNA molecules with protein coat.

101

Biology+4 / −1

A decrease in blood pressure/volume will not cause the release of

ADH.

renin.

atrial Natriuretic Factor.

aldosterone.

102

Biology+4 / −1

An example of colonial alga is

Spirogyra.

Chlorella.

Volvox.

Ulothrix.

103

Biology+4 / −1

The morphological nature of the edible part of coconut is

pericarp.

perisperm.

cotyledon.

endosperm.

104

Biology+4 / −1

Which of the following is correctly matched for the product produced by them ?

Saccharomyces cerevisiae : Ethanol

Acetobacter aceti : Antibiotics

Methanobacterium : Lactic acid

Penicillium notatum : Acetic acid

105

Biology+4 / −1

Match the following sexually transmitted diseases (Column - I) with their causative agent (Column - II) and select the correct option.

(a) - (iv), (b) - (iii), (c) - (ii), (d) - (i)

(a) - (ii), (b) - (iii), (c) - (iv), (d) - (i)

(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

(a) - (iv), (b) - (ii), (c) - (iii), (d) - (i)

106

Biology+4 / −1

In case of poriferans, the spongocoel is lined with flagellated cells called

mesenchymal cells.

ostia.

oscula.

choanocytes.

107

Biology+4 / −1

Among the following characters, which one was not considered by Mendel in his experiments on pea ?

Pod – Inflated or Constricted

Stem – Tall or Dwarf

Trichomes – Glandular or Non-glandular

Seed – Green or Yellow

108

Biology+4 / −1

Identify the wrong statement in context of heartwood

It comprises dead elements with highly lignified walls.

Organic compounds are deposited in it.

It is highly durable.

It conducts water and minerals efficiently.

109

Biology+4 / −1

During DNA replication, Okazaki fragments are used to elongate

the lagging strand away from the replication fork.

the leading strand towards the replication fork.

the lagging strand towards the replication fork.

the leading strand away from the replication fork.

110

Biology+4 / −1

Mycorrhizae are the example of

mutualism.

fungistasis.

amensalism.

antibiosis.

111

Biology+4 / −1

Which of the following RNA's is the most abundant in animal cell ?

mi-RNA

r-RNA

t-RNA

m-RNA

112

Biology+4 / −1

The process of separation and purification of expressed protein before marketing is called

postproduction processing.

upstream processing.

downstream processing.

bioprocessing.

113

Biology+4 / −1

Which among the following are the smallest living cells, known without a definite cell wall, pathogenic to plants as well as animals and can survive without oxygen ?

Nostoc

Bacillus

Pseudomonas

Mycoplasma

114

Biology+4 / −1

Which of the following components provides sticky character to the bacterial cell ?

Glycocalyx

Cell wall

Nuclear membrane

Plasma membrane

115

Biology+4 / −1

With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct ?

Tomato is a greenhouse crop which can be grown in CO₂ -enriched atmosphere for higher yield.

Light saturation for CO₂ fixation occurs at 10% of full sunlight.

Increasing atmospheric CO₂ concentration upto 0.05% can enhance CO₂fixation rate.

C₃ plants responds to higher temperatures with enhanced photosynthesis while C₄ plants have much lower temperature optimum.

116

Biology+4 / −1

Which of the following options best represents the enzyme composition of pancreatic juice ?

Lipase, amylase, trypsinogen, procarboxy-peptidase

Amylase, peptidase, trypsinogen, rennin

Amylase, pepsin, trypsinogen, maltase

Peptidase, amylase, pepsin, rennin

117

Biology+4 / −1

Which one of the following statements is correct, with reference to enzymes ?

Holoenzyme = Coenzyme + Co-factor

Apoenzyme = Holoenzyme + Coenzyme

Holoenzyme = Apoenzyme + Coenzyme

Coenzyme = Apoenzyme + Holoenzyme

118

Biology+4 / −1

If there are 999 bases in an RNA that codes for a protein with 333 amino acids, and the base at position 901 is deleted such that the length of the RNA becomes 998 bases, how many codons will be altered ?

333

119

Biology+4 / −1

Asymptote in a logistic growth curve is obtained when

K < N

The value of 'r' approaches zero

K = N

K > N

120

Biology+4 / −1

Select the mismatch from the following

Equisetum – Homosporous

Pinus – Dioecious

Cycas – Dioecious

Salvinia – Heterosporous

121

Biology+4 / −1

Anaphase promoting complex (APC) is a protein degradation machinery necessary for proper mitosis of animal cells. If APC is defective in a human cell, which of the following is expected to occur ?

Recombination of chromosome arms will occur

Chromosomes will not condense

Chromosomes will be fragmented

Chromosomes will not segregate

122

Biology+4 / −1

Which ecosystem has the maximum biomass ?

Lake ecosystem

Forest ecosystem

Grassland ecosystem

Pond ecosystem

123

Biology+4 / −1

Zygotic meiosis is characteristic of

Chlamydomonas.

Marchantia.

Fucus.

Funaria.

124

Biology+4 / −1

Hypersecretion of Growth Hormone in adults does not cause further increase in height, because

muscle fibres do not grow in size after birth.

growth hormone becomes inactive in adults.

epiphyseal plates close after adole scence.

bones loose their sensitivity to Growth Hormone in adults.

125

Biology+4 / −1

Frog's heart when taken out of the body continues to beat for sometime.
Select the best option from the following statements :
(i) Frog is a poikilotherm
(ii) Frog does not have any coronary circulation
(iii) Heart is "myogenic" in nature
(iv) Heart is autoexcitable

(iii) & (iv)

Only (iii)

Only (iv)

(i) & (ii)

126

Biology+4 / −1

Transplantation of tissues/organs fails often due to non-acceptance by the patient's body. Which type of immune-response is responsible for such rejections ?

Physiological immune response

Autoimmune response

Cell-mediated immune response

Hormonal immune response

127

Biology+4 / −1

Thalassemia and sickle cell anaemia are caused due to a problem in globin molecule synthesis. Select the correct statement.

Sickle cell anemia is due to a quantitative problem of globin molecules. Options

Both are due to a qualitative defect in globin chain synthesis.

Both are due to a quantitative defect in globin chain synthesis.

Thalassemia is due to less synthesis of globin molecules.

128

Biology+4 / −1

An important characteristic that Hemichordates share with Chordates is

pharynx without gill slits.

absence of notochord.

ventral tubular nerve cord.

pharynx with gill slits.

129

Biology+4 / −1

Double fertilization is exhibited by

angiosperms.

gymnosperms.

algae.

fungi.

130

Biology+4 / −1

Which of the following cell organelles is responsible for extracting energy from carbohydrates to form ATP ?

Mitochondrion

Lysosome

Ribosome

Chloroplast

131

Biology+4 / −1

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of

Expiratory Reserve Volume.

Residual Volume.

Inspiratory Reserve Volume.

Tidal Volume.

132

Biology+4 / −1

Which of the following are not polymeric ?

Lipids

Nucleic acids

Proteins

Polysaccharides

133

Biology+4 / −1

Flowers which have single ovule in the ovary and are packed into inflorescence are usually pollinated by

bat

water

bee

wind

134

Biology+4 / −1

Life cycle of Ectocarpus and Fucus respectively are

Haplodiplontic, Haplontic

Haplontic, Diplontic

Diplontic, Haplodiplontic

Haplodiplontic, Diplontic

135

Biology+4 / −1

Presence of plants arranged into well defined vertical layers depending on their height can be seen best in

Temperate Forest.

Tropical Savannah.

Tropical Rain Forest.

Grassland.

136

Biology+4 / −1

Phosphoenol pyruvate (PEP) is the primary CO₂ acceptor in

C₃ and C₄ plants

C₃ plants

C₄ plants

C₂ plants

137

Biology+4 / −1

Good vision depends on adequate intake of carotene rich food.
Select the best option from the following statements:
(i) Vitamin A derivatives are formed from carotene
(ii) The photopigments are embedded in the membrane discs of the inner segment
(iii) Retinal is a derivative of vitamin A
(iv) Retinal is a light absorbing part of all the visual photopigments

(ii), (iii) & (iv)

(i) & (ii)

(i), (iii) & (iv)

(i) & (iii)

138

Biology+4 / −1

Which one from the given below is the period for Mendel's hybridization experiments ?

1870-1877

1856-1863

1840-1850

1857 - 1869

139

Biology+4 / −1

Select the mismatch

Rhizobium – Alfalfa

Frankia – Alnus

Rhodospirillum – Mycorrhiza

Anabaena – Nitrogen fixer

140

Biology+4 / −1

Attractants and rewards are required for

cleistogamy.

anemophily.

entomophily.

hydrophily.

141

Biology+4 / −1

In case of a couple, where the male is having a very low sperm count, which technique will be suitable for fertilisation ?

Intracytoplasmic sperm injection

Intrauterine transfer

Gamete intracytoplasmic fallopian transfer

Artificial Insemination

142

Biology+4 / −1

Which among these is the correct combination of aquatic mammals ?

Trygon, Whales, Seals

Seals, Dolphins, Sharks

Dolphins, Seals, Trygon

Whales, Dolphins, Seals

143

Biology+4 / −1

Functional megaspore in an angiosperm develops into

embryo.

ovule.

endosperm.

embryo sac.

144

Biology+4 / −1

Root hairs develop from the region of

Meristematic activity

Maturation

Elongation

Root cap

145

Biology+4 / −1

A dioecious flowering plant prevents both

cleistogamy and xenogamy.

autogamy and xenogamy.

autogamy and geitonogamy.

geitonogamy and xenogamy.

146

Biology+4 / −1

The hepatic portal vein drains blood to liver from

intestine.

heart.

stomach.

kidneys.

147

Biology+4 / −1

What is the criterion for DNA fragments movement on agarose gel during gel electrophoresis ?

Negatively charged fragments do not move

The larger the fragment size , the farther it moves

The smaller the fragment size , the farther it moves

Positively charged fragments move to farther end

148

Biology+4 / −1

Which of the following represents order of ' Horse ' ?

Ferus

Equidae

Perissodactyla

Caballus

149

Biology+4 / −1

Which statement is wrong for Kreb's cycle ?

The cycle starts with the condensation of acetyl group ( acetyl CoA ) with pyruvic acid to yield citric acid .

There are three points in the cycle where NAD⁺ is reduced to NADH + H⁺ .

There is one point in the cycle where FAD⁺ is reduced to FADH₂ .

During conversion of succinyl CoA to succinic acid , a molecule of GTP is synthesized .

150

Biology+4 / −1

Artificial selection to obtain cows yielding higher milk output represents

Stabilizing ; followed by disruptive as it stabilizes the population to produce higher yielding cows .

Stabilizing ; selection as it stabilizes this character in the population .

Directional ; as it pushes the mean of the character in one direction .

Disruptive ; as it splits the population into two , one yielding higher output and the other lower output .

151

Biology+4 / −1

The region of Biosphere Reserve which is legally protected and where no human activity is allowed is known as

Restoration zone .

Core zone .

Buffer zone.

Transition zone .

152

Biology+4 / −1

Receptor sites for neurotransmitters are present on

post - synaptic membrane .

membranes of synaptic vesicles .

pre - synaptic membrane .

tips of axons .

153

Biology+4 / −1

The vascular cambium normally gives rise to

periderm

phelloderm

primary phloem

secondary xylem

154

Biology+4 / −1

A baby boy aged two years is admitted to play school and passes through a dental check - up. The dentist observed that the boy had twenty teeth. Which teeth were absent ?

Molars

Incisors

Canines

Premolars

155

Biology+4 / −1

The water potential of pure water is

more than one .

zero .

less than zero .

more than zero but less than one .

156

Biology+4 / −1

DNA fragments are

either positively or negatively charged depending on their size .

positively charged .

negatively charged .

neutral .

157

Biology+4 / −1

Capacitation occurs in

female Reproductive tract .

rete testis .

epididymis .

vas deferens .

158

Biology+4 / −1

The function of copper ions in copper releasing IUD's is

they inhibit ovulation .

they suppress sperm motility and fertilizing capacity of sperms .

they inhibit gametogenesis .

they make uterus unsuitable for implantation .

159

Biology+4 / −1

A gene whose expression helps to identify transformed cell is known as

structural gene .

selectable marker.

vector .

plasmid .

160

Biology+4 / −1

Which one of the following statements is not valid for aerosols ?

They have negative impact on agricultural land .

They are harmful to human health .

They alter rainfall and monsoon patterns .

They cause increased agricultural productivity .

161

Biology+4 / −1

Which of the following statements is correct ?

The descending limb of loop of Henle is permeable to electrolytes .

The ascending limb of loop of Henle is impermeable to water .

The descending limb of loop of Henle is impermeable to water .

The ascending limb of loop of Henle is permeable to water .

162

Biology+4 / −1

Which of the following in sewage treatment removes suspended solids ?

Sludge treatment

Tertiary treatment

Secondary treatment

Primary treatment

163

Biology+4 / −1

GnRH, a hypothalamic hormone, needed in reproduction, acts on

posterior pituitary gland and stimulates secretion of LH and relaxin .

anterior pituitary gland and stimulates secretion of LH and oxytocin .

anterior pituitary gland and stimulates secretion of LH and FSH .

posterior pituitary gland and stimulates secretion of oxytocin and FSH

164

Biology+4 / −1

Which of the following facilitates opening of stomatal aperture ?

Longitudinal orientation of cellulose microfibrils in the cell wall of guard cells

Contraction of outer wall of guard cells

Decrease in turgidity of guard cells

Radial orientation of cellulose microfibrils in the cell wall of guard cells

165

Biology+4 / −1

The genotypes of a Husband and Wife are I^AI^B and I^Ai. Among the blood types of their children, how many different genotypes and phenotypes are possible ?

4 genotypes ; 4 phenotypes

3 genotypes ; 3 phenotypes

3 genotypes ; 4 phenotypes

4 genotypes ; 3 phenotypes

166

Biology+4 / −1

Plants which produce characteristic pneu-matophores and show vivipary belongs to

hydrophytes.

mesophytes.

halophytes.

psammophytes.

167

Biology+4 / −1

Alexander Von Humboldt described for the first time

population Growth equation.

ecological Biodiversity.

laws of limiting factor.

species area relationships.

168

Biology+4 / −1

DNA replication in bacteria occurs

just before transcription.

during S-phase.

within nucleolus.

prior to fission.

169

Biology+4 / −1

MALT constitutes about ________________ percent of the lymphoid tissue in human body.

10%

50%

20%

70%

170

Biology+4 / −1

In Bougainvillea thorns are the modifications of

leaf.

stipules.

adventitious root.

stem.

171

Biology+4 / −1

Fruit and leaf drop at early stages can be prevented by the application of

gibberellic acid.

cytokinins.

ethylene.

auxins.

172

Biology+4 / −1

Which of the following are found in extreme saline conditions ?

Mycobacteria

Archaebacteria

Eubacteria

Cyanobacteria

173

Biology+4 / −1

Coconut fruit is a

capsule.

drupe.

berry.

nut.

174

Biology+4 / −1

The DNA fragments separated on an agarose gel can be visualised after staining with

ethidium bromide.

bromophenol blue.

acetocarmine.

aniline blue.

175

Biology+4 / −1

Out of 'X' pairs of ribs in humans only 'Y' pairs are true ribs. Select the option that correctly represents values of X and Y and provides their explanation

X = 24, Y = 12 - True ribs are dorsally attached to vertebral column but are free on ventral side

X = 12, Y = 7 - True ribs are dorsally attached to vertebral column and ventrally to the sternum

X = 12, Y = 5 - True ribs are attached dorsally to vertebral column and sternum on the two ends

X = 24, Y = 7 - True ribs are dorsally attached to vertebral column but are free on ventral side

176

Biology+4 / −1

Myelin sheath is produced by

Osteoclasts and Astrocytes.

Schwann Cells and Oligodendrocytes.

Astrocytes and Schwann Cells.

Oligodendrocytes and Osteoclasts.

177

Biology+4 / −1

Which of the following options gives the correct sequence of events during mitosis ?

Condensation → arrangement at equator → centromere division → segregation → telophase

Condensation → nuclear membrane disassembly → crossing over → segregation → telophase

Condensation → nuclear membrane disassembly → arrangement at equator → centromere division → segregation → telophase

Condensation → crossing over → nuclear membrane disassembly → segregation → telophase

178

Biology+4 / −1

A disease caused by an autosomal primary non- disjunction is

sickle cell anemia.

down's syndrome.

klinefelter's syndrome.

turner's syndrome.

179

Biology+4 / −1

Which cells of 'Crypts of Lieberkuhn' secrete antibacterial lysozyme ?

Kupffer cells

Argentaffin cells

Paneth cells

Zymogen cells

180

Biology+4 / −1

Which one of the following is related to Ex-situ conservation of threatened animals and plants ?

Himalayan region

Wildlife Safari parks

Biodiversity hot spots

Amazon rainforest

NEET 2016 · Full Paper · 180 questions · 200 minutes · +4 / −1 marking

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