Physics · NDA previous year questions

When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by :

1. A.the theory of relativity.
2. B.Newton's first law.
3. C.Newton's second law.
4. D.Newton's third law.

The material used for electric fuse is an alloy of tin and lead. This alloy should have :

1. A.high specific resistance and low melting point.
2. B.low specific resistance and high melting point.
3. C.low specific resistance and low melting point.
4. D.high specific resistance and high melting point.

Suppose you are standing 1 m in front of a plane mirror. What should be the minimum vertical size of the mirror so that you can see your full image in it?

1. A.0·50 m
2. B.2 m
3. C.half of your height.
4. D.twice your height.

Light travels slower in glass than in air because :

1. A.refractive index of air is less than that of glass.
2. B.refractive index of air is greater than that of glass.
3. C.density of glass is greater than that of air.
4. D.density of glass is less than that of air.

The lines of force of a uniform magnetic field :

1. A.must be convergent.
2. B.must be divergent.
3. C.must be parallel to each other.
4. D.intersect.

A Jet engine works on the principle of conservation of :

1. A.linear momentum.
2. B.angular momentum.
3. C.energy.
4. D.mass.

The surface temperature of the Sun is nearly :

1. A.2000 K
2. B.4000 K
3. C.6000 K
4. D.8000 K

If the electrical resistance of a typical substance suddenly drops to zero, then the substance is called :

1. A.super conductor.
2. B.semiconductor.
3. C.conductor.
4. D.insulator.

A spherical air bubble is embedded in a piece of glass. For a ray of light passing through the bubble, it behaves like a :

1. A.converging lens.
2. B.diverging lens.
3. C.plano-converging lens.
4. D.plano-diverging lens.

'The stars seem to be higher on the sky than they actually are'. This can be explained by :

1. A.atmospheric refraction.
2. B.dispersion of light.
3. C.total internal reflection.
4. D.diffraction of light.

Mass of B is four times that of A. B moves with a velocity half that of A. Then B has :

1. A.kinetic energy equal to that of A.
2. B.half the kinetic energy of A.
3. C.twice the kinetic energy of A.
4. D.kinetic energy one-fourth of A.

In a pressure cooker cooking is faster because the increase in vapour pressure :

1. A.increases the specific heat.
2. B.decreases the specific heat.
3. C.decreases the boiling point.
4. D.increases the boiling point.

Magnets attract magnetic substances such as iron, nickel, cobalt etc. They can also repel :

1. A.paramagnetic substances.
2. B.ferromagnetic substances.
3. C.diamagnetic substances.
4. D.non-magnetic substances.

When a ray of light is going from one medium to another, its :

1. A.wavelength remains same.
2. B.frequency remains same.
3. C.frequency increases.
4. D.wavelength increases.

Iron nails are dipped into blue copper sulphate solution. After some time iron nails are :

1. A.dissolved and blue colour is discharged.
2. B.dissolved but blue colour is not discharged.
3. C.not dissolved and blue colour is not discharged.
4. D.not dissolved but blue colour is discharged.

Which of the following statements about diamond are correct? 1. It is used as a gem in jewellery because of its ability to reflect light 2. It is a good conductor of electricity 3. It is used for cutting glass, marble stones and other hard materials 4. It is used for drilling of rocks Select the correct answer using the code given below :

1. A.1, 3 and 4
2. B.2, 3 and 4
3. C.1, 2 and 3
4. D.2 and 4 only

Statement II : The eye lens of a myopic person focuses the parallel rays coming from distant objects in front of the retina

1. A.Both the statements are individually true and statement II is the correct explanation of statement I
2. B.Both the statements are individually true but statement II is not the correct explanation of statement I
3. C.Statement I is true but Statement II is false
4. D.Statement I is false but statement II is true

The next four (04) items are based on the following Table : Match List I with List II, List III and List IV and select the correct answer using the code given below : $$\begin{array}{llll}\text{List I (Body system)}& \text{List II (Organ)}& \text{List III (Structure)}& \text{List IV (Function of the system)}\\ \text{A. Blood Circulation}& \text{1. Bone marrow}& \text{I. Alveoli}& \text{i. Clot formation}\\ \text{B. Excretory}& \text{2. Thymus}& \text{II. T-lymphocyte}& \text{ii. Perfusion of tissues}\\ \text{C. Alimentary}& \text{3. Intestine}& \text{III. Myocardium}& \text{iii. Support and protect of body frame}\\ \text{D. Skeletal}& \text{4. Lung}& \text{IV. Matrix}& \text{iv. Oxygenation}\\ \text{E. Blood}& \text{5. Bone}& \text{V. Nephron}& \text{v. Filtration of body waste}\\ \text{F. Respiratory}& \text{6. Heart}& \text{VI. Villi}& \text{vi. Absorption of nutrients}\\ \text{G. Neurological}& \text{7. Kidney}& \text{VII. Axon}& \text{vii. Fighting infection and foreign invasion}\\ \text{H. Immunological}& \text{8. Neuron}& \text{VIII. Platelets}& \text{viii. Transmission of electrical impulse}\end{array}$$ List I List II List III List IV

1. A.A 1 III ii
2. B.B 7 VI v
3. C.A 6 III ii
4. D.B 2 V v

Which among the following are the properties of good paint ? 1. The paint should be opaque and have high covering power 2. The solid particles in paint should reflect much of the destructive light to ensure long life of the paint 3. Combination of pigments, e.g., white lead and $\mathrm{Ti}{\mathrm{O}}_2$ give better result 4. Addition of plasticiser destroy the elasticity of the film and leads to cracking Select the correct answer using the code given below :

1. A.1, 2 and 4
2. B.1, 2 and 3
3. C.2 and 3 only
4. D.1 and 3 only

Which one of the following characteristics of the particle does the shaded area of the velocity-time graph shown above represent?

1. A.Momentum
2. B.Acceleration
3. C.Distance covered
4. D.Speed

A body is at rest on the surface of the earth. Which one among the following statements is correct regarding this?

1. A.No force is acting on the body
2. B.Only weight of the body acts on it
3. C.Net downward force is equal to the net upward force
4. D.None of the above statements is correct

A pendulum beats faster than a standard pendulum. In order to bring it to the standard beat, the length of the pendulum is to be :

1. A.reduced
2. B.increased
3. C.reduced and the mass of the bob increased
4. D.reduced and also the mass of the bob reduced

Two identical blocks of ice, A and B, float in water as shown in the figure given above. Which one among the following statements in this regard is correct?

1. A.Block A displaces a greater volume of water since the pressure acts on a smaller bottom area
2. B.Block A displaces a greater volume of water since its submerged end is lower in the water
3. C.Block B displaces a greater volume of water since its submerged end has a greater area in water
4. D.The two blocks displace equal volumes of water since they have the same specific gravity and same mass

When a ship floats on water :

1. A.it displaces no water
2. B.the mass of water displaced is equal to the mass of the ship
3. C.the mass of water displaced is lesser than the mass of the ship
4. D.the mass of water displaced is greater than the mass of the ship

Sound moves with higher velocity if :

1. A.pressure of the medium is decreased
2. B.temperature of the medium is increased
3. C.humidity of the medium is increased
4. D.both (b) and (c) above