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# NDA Science Previous Year Questions

Q1.
The specific gravity of a substance is measured by a hydrometer at the sea level. If the measurement is done at the top of a mountain, what would be the specific gravity?
(a) Zero
(b) More than that measured at the sea level
(c) Less than that measured at the sea level
(d) Same as that measured at the sea level

Q2. A block of weight W floats in a lake. If the apparent weight of the floating block is W’, then which one of the following is correct?
(a) W ‘> W
(b) W=W/2
(c) W ‘=W
(d) W’=0

Q3. Consider two hollow glass spheres, one containing water and the other containing mercury. Each liquid fills about one-tenth of the volume of the sphere. In zero gravity environment
(a) water and mercury float freely inside the sphere
(b) water forms a layer on the glass, while mercury floats
(c) mercury forms a layer on the glass, while water floats
(d) water and mercury both form a layer on the glass

Q4. A bus moving at a speed of 24m/s begins to slow at a rate of 3 m/s each second. How far does it go before stopping?
(a) 96 m
(b) 72 m
(c) 60 m
(d) 48 m

Q5. On planet Earth, there is no centrifugal force at the
(a) Equator
(b) Tropic of Cal1cer
(c) Tropic of Capricorn
(d) Poles

Q6. It is impossible for two oscillators, each executing simple harmonic motion, to remain in phase with each other if they have different
(a) time periods
(b) amplitudes
(c) spring constants
(d) kinetic energy

Q7. A car is moving with a uniform speed. However its momentum is changing. Then the car
(a) may be on an elliptical path
(b) is moving on a straight path without acceleration
(c) is moving on a straight path with acceleration
(d) is moving without any acceleration

Q8. Two spheres of the same metal have radii in the ratio 1:2. Their heat capacities are in what ratio?
(a) 1: 2
(b) 1: 4
(c) 2: 1
(d) 1: 8

Q9. The surface temperature of the Sun is nearly
(a) 2000 K
(b) 4000 K
(c) 6000 K
(d) 8000 K

Q10. 1. The turntable of a gramophone is rotated at a constant speed of x revolutions/minute. Which one of the following values of the revolutions per minute is not used?
(a) 78 r.p.m.
(b) 56 r.p.m.
(c) 45 r.p.m.
(d) 33 r.p.m.

Q11. A pendulum clock is set to give correct time at the sea level. The clock is moved to a hill station at an altitude ‘h’ above sea level. In order to keep correct time on the hill station which one of the following adjustments is required?
(a) The length of the pendulum has to be reduced
(b) The length of the pendulum has to be increased
(c) The mass of the pendulum has to be increased
(d) The mass of the pendulum has to be reduced

Q12. Ultrasonic waves are those sound waves having frequency
(a) between 20 hertz and 1000 hertz
(b) between 1000 hertz and 20000 hertz
(c) more than 20 kilohertz
(d) less than 20 hertz

1. 2. (d)3. (b)4. (a)5. (d)6. (a)7. (a)8. (d)9. (c)10. 11. (a)12. (c)

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