Physics · NDA previous year questions

1. A.The velocity of the particle is uniform
2. B.The velocity of the particle is non-uniform
3. C.The speed is uniform and the particle is moving on a circular path
4. D.The speed is non-uniform and the particle is moving on a straight line path

The human eye is like a camera and hence it contains a system of lens. The eye lens forms

1. A.a straight or upright, real image of the object on the retina
2. B.an inverted, virtual image of the object on the retina
3. C.an inverted, real image of the object on the retina
4. D.a straight or upright, real image of the object on the iris

An object is placed at the focus of a concave mirror. The image will be

1. A.real, inverted, same size at the focus
2. B.real, upright, same size at the focus
3. C.virtual, inverted, highly enlarged at infinity
4. D.real, inverted, highly enlarged at infinity

An optician prescribes a power $=-0.5\text{dioptre}$. The corresponding lens must be a

1. A.convex lens of focal length $2\mathrm{m}$
2. B.convex lens of focal length $50\mathrm{cm}$
3. C.concave lens of focal length $2\mathrm{m}$
4. D.concave lens of focal length $50\mathrm{cm}$

A particle is moving freely. Then its

1. A.kinetic energy is always greater than zero
2. B.potential energy is greater than zero and kinetic energy is less than zero
3. C.potential energy is less than zero and kinetic energy is greater than zero
4. D.potential energy is zero and kinetic energy is less than zero

The displacement of a particle at time $t$ is given by $\vec{x}=a\hat{i}+bt\hat{j}+\frac{c}{2}{t}^2\hat{k}$ where $a,b$ and $c$ are positive constants. Then the particle is

1. A.accelerated along $\hat{k}$-direction
2. B.decelerated along $\hat{k}$-direction
3. C.decelerated along $\hat{j}$-direction
4. D.accelerated along $\hat{j}$-direction

Gravitational force shares a common feature with electromagnetic force. In both cases, the force is

1. A.between massive and neutral objects
2. B.between charged objects
3. C.a short range
4. D.a long range

The spread in colours in a rainbow on sky is primarily due to

1. A.dispersion of sunlight
2. B.reflection of sunlight
3. C.refraction of sunlight
4. D.total internal reflection of sunlight

A force $F$ is applied on a body (which moves on a straight line) for a duration of $3\mathrm{s}$. The momentum of the body changes from $10\mathrm{g}cm/s$ to $40\mathrm{g}cm/s$. The magnitude of the force $F$ is

1. A.10 dynes
2. B.10 newtons
3. C.120 dynes
4. D.12 dynes

Specific gravity of silver is 11 and specific gravity of iron is 8. Which one among the following is the approximate relative density of silver with respect to iron?

1. A.1.4
2. B.0.7
3. C.3.0
4. D.2.8

A positively charged particle projected towards west is deflected towards north by a magnetic field. The direction of the magnetic field is

1. A.towards south
2. B.towards east
3. C.in downward direction
4. D.in upward direction

Which one among the following is the correct order of power consumption for light of equal intensity ?

1. A.CFL tube < Fluorescent tube < Incandescent bulb < Light emitting diode
2. B.Light emitting diode < CFL tube < Fluorescent tube < Incandescent bulb
3. C.CFL tube < Fluorescent tube < Light emitting diode < Incandescent bulb
4. D.Incandescent bulb < Light emitting diode < Fluorescent tube < CFL tube

A swinging pendulum has its maximum acceleration at

1. A.the bottom of the swing
2. B.the two extremities of the swing
3. C.every point on the swing
4. D.no particular portion of the pendulum

The process of nuclear fusion in the sun requires

1. A.very high temperature and very high pressure
2. B.low temperature and high pressure
3. C.high temperature and low pressure
4. D.very high temperature and no pressure

In India, distribution of electricity for domestic purpose is done in the form of

1. A.220 V; 50 Hz
2. B.110 V; 60 Hz
3. C.220 V; 60 Hz
4. D.110 V; 50 Hz

The earth’s magnetic field is approximately

1. A.1 Tesla
2. B.2 Gauss
3. C.$10^4$ Tesla
4. D.1 Gauss

Yellow colour light is used as fog light because yellow colour

1. A.light is most scattered by fog
2. B.has the longest wavelength among all colours
3. C.has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarity with red
4. D.has the shortest wavelength among all colours not already reserved for other purpose

A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the

1. A.temperature of the object
2. B.temperature of the surroundings
3. C.temperature difference between the object and its surroundings
4. D.average temperature of the object and its surroundings

The mirror used for the head light of a car is

1. A.spherical concave
2. B.plane
3. C.cylindrical
4. D.parabolic concave

Match List I with List II and select the correct answer using the code given below the Lists: | List I *(Magnet)* | List II *(Property)* | | :--- | :--- | | A. Artificial magnet | 1. Long lived | | B. Permanent magnet | 2. Last for infinitely long period | | C. Temporary magnet | 3. Short lived | | D. Earth as a magnet | 4. Induced magnet | *Code :*

1. A.3 1 4 2
2. B.3 4 1 2
3. C.2 1 4 3
4. D.2 4 1 3

The polarity of an unmarked horse shoe magnet can be determined by using

1. A.a charged glass rod
2. B.a magnetic compass
3. C.an electroscope
4. D.another unmarked bar magnet

A staircase has 5 steps each $10\text{ cm}$ high and $10\text{ cm}$ wide. What is the minimum horizontal velocity to be given to the ball so that it hits directly the lowest plane from the top of the staircase? ($g=10{\text{ ms}}^{-2}$)

1. A.$2{\text{ ms}}^{-1}$
2. B.$1{\text{ ms}}^{-1}$
3. C.$\sqrt{2}{\text{ ms}}^{-1}$
4. D.$\frac{1}{2}{\text{ ms}}^{-1}$

Consider the following circuit: The current flowing through each of the resistors connected in the above circuit is

1. A.2A
2. B.1A
3. C.9A
4. D.4A

Telescopes are placed in space to view distant galaxies primarily to

1. A.get closer to the observed objects
2. B.avoid the absorption of light or other radiations in the atmosphere of the earth
3. C.avoid light pollution from the earth's populated areas
4. D.avoid steering the telescope against the earth's motion

When an electrical safety fuse is rated (marked) as 16 A, it means it

1. A.will not work if current is less than 16 A
2. B.has a resistance of 16 Ω
3. C.will work if the temperature is more than 16°C
4. D.will be blown (break) if current exceeds 16 A