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NDA Science Questions

A pendulum beats, faster than a standard pendulum. In order to bring it to the standard beat, the length of th pendulum is to be
(a) reduced
(b) increased
(c) reduced and the mass of the bob increased
(d) reduced and also the mass of the bob reduced

Q2. If an object undergoes a uniform circular motion, then its
(a) acceleration remains uniform [2013-I]
(b) velocity changes
(c) speed changes
(d) velocity remains uniform

Q3. Evening Sun is not as hot as the mid day sun. What is the reason?
(a) In the evening, radiation travel slowly
(b) In the evening, the temperature of the sun decreases
(c) Ozone in atmosphere absorbs more light in the evening
(d) In the evening, radiations travels larger distance through atmosphere

Q4. Thermometer A and B have ice points marked at 15° and 25° and steam points at 75° and 125° respectively. When thermometer A measures the temperature of a bath as 60°, the reading of B for the same bath is
(a) 60°
(b) 75°
(c) 90°
(d) 100°

Q5. Consider the following statements for a simple harmonic motion:
 1. The magnitude of the velocity of the body is proportional to its displacement from the mean position.
 2. The magnitude of the acceleration of the body is proportional to its displacement from the mean position.
 3. The sum of the kinetic energy and potential energy of the body is always constant.
Which of the statements given above is/are correct?
(a) 1 and 3
(b) 2 and 3
(c) Only 3
(d) Only 2

Q6. Which one of the following is not electromagnetic in nature?
(a) Cathode-rays
(b) X-rays
(c) Gamma-rays
(d) Infrared-rays

Q7. 1. Two plane mirrors are inclined at an angle q to one another. A ray of light incident on the first mirror and parallel to the second mirror is reflected from the second mirror parallel to the first mirror. What is the value of q?
(a) 0°
(b) 45°
(c) 60°
(d) 90°

Q8. When an optician prescribes a – 5D lens, what does it mean?
(a) Concave lens of 20 cm focal length
(b) Convex lens of 5 cm focal length
(c) Concave lens of 5 cm focal length
(d) Convex lens of 5 cm focal length

Q9. A refracting telescope consists of
(a) one concave mirror and one convex lens
(b) two convex lenses of equal focal length
(c) two concave mirrors of different focal lengths
(d) two convex lenses of unequal focal lengths

Q10. Why does a tower appear larger and larger to a person approaching it?
 1. The angle subtended by the tower at the eye increases.
 2. The focal length of eye lens increases.
 3. The size of the image on the retina of eye increases. Select the correct answer using the code given below:
(a) 1 only
(b) 3 only
(c) 1 and 3 only
(d) 1, 2 and 3

Q11. Which one of the following is the correct statement? A fairly uniform magnetic field is produced
(a) inside a horse-shoe magnet
(b) inside a cylindrical conductor
(c) inside a solenoid
(d) between two parallel conductors

Q12. In which one of the following cases Ohm’s law is not valid?
(a) Wire bound resistor
(b) Potentiometer
(c) Junction diode
(d) Electric bulb

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

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