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NDA Science Quiz


Q1.
The following questions consist of two statements, one labelled as the Assertion (A) and the other as ‘Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below:
Assertion (A): Most coloured flowers when exposed to chlorine get bleached.
Reason (R): HCl produced by the action of chlorine on water oxidises coloured matter to colourless compound.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true but R is NOT the correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Q2. A syringe is a hollow glass tube with lower end tapered to a nozzle. Due to which one of the following liquid can be drawn into a syringe?
(a) Partial vacuum produced inside the glass tube
(b) Diffusion
(c) Surface tension effect
(d) Capillary action

Q3. Flow velocities in an incompressible fluid can be measured with which one of the following?
(a) Barometer
(b) Venturi tube
(c) Strain gauge
(d) Manometer

Q4.  The following questions consist of two statements, one labelled as the Assertion (A) and the other as ‘Reason (R), You are to examine these two statements carefully and select the answers to these items using the codes given below:
26.
Assertion (A): Diameter of one of the limbs of a U-tube manometer is twice that of its other limb. The limbs are open to atmosphere at their free ends. If mercury is added to the manometer, the level of mercury in the wider limb will be half of that in the narrower limb.
Reason (R): Liquids always maintain the same level under same pressure.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is the NOT correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Q5. Consider the following statements. Work is not done, when:
 1. a man is walking on a horizontal road.
 2. a man is climbing up a hill.
 3. a man with a load on his head is walking on a horizontal road.
 4. moon is revolving round the earth.
Which of the statements given above are correct?
(a) 1 and 3 only
(b) 1 and 4 only
(c) 2, 3 and 4
(d) 1, 3 and 4

Q6. Consider the following statements: If the net external torque acting on an object is switched off, then –
 1. Linear momentum will remain unchanged.
 2. Angular momentum will remain unchanged. Which of the statements given above is/are correct?
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Q7. Mass of B is four times that of A.B moves with a velocity half that of A. Then, B has
(a) kinetic energy equal to that of A
(b) half the kinetic energy of A
(c) twice the kinetic energy of A
(d) kinetic energy one-fourth of A

Q8. For a simple pendulum, the graph between T2 and L (where T is the time period & L is the length) is
(a) straight line passing through origin
(b) parabolic
(c) circle
(d) none of the above

Q9.  Each of the next two items consists of two statements, one labelled as the ‘Assertion (A)’ and the other as ‘Reason (R)’. You are to examine these two statements carefully and select the answers to these items using the codes given below:
85.
Assertion (A): Two artificial satellites having different masses and revolving around the Earth in the same circular orbit have same speed.
Reason (R): The speed of a satellite is directly proportional to the radius of its orbit.
 
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is the NOT correct explanation of A
(c) A is true but R is false
(d) A is false but R is true

Q10. A fan produces a feeling of comfort during hot weather, because
(a) our body radiates more heat in air
(b) fan supplies cool air
(c) conductivity of air increases
(d) our perspiration evaporates rapidly

Q11. A hot object loses heat to its surroundings in the form of heat radiation. The rate of loss of heat depends on the
(a) temperature of the object
(b) temperature of the surroundings
(c) temperature difference between the object and its surroundings
(d) average temperature of the object and its surroundings

Q12. Consider the following statements:
Sound waves can undergo
 1. reflection
 2. refraction
 3. interference
(a) 1 and 2 only
(b) 2 and 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

 
1. (c)2. (a)3. (b)4. c5. (d)6. (b)7. (a)8. (a)9. (c)10. (d)11. (d)12. (d)

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