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NDA General Science Practice Test


Q1.
Why do two ice blocks join to form one block when pressed together?
(a) Melting point of ice is lowered with increase in pressure
(b) Melting point of ice increases with increase in pressure
(c) Melting point of ice remains unchanged with increase in pressure
(d) Melting point of ice is 0°C

Q2. The phenomenon of ‘trade winds’ takes place due to
(a) conduction of heat
(b) convection of heat
(c) radiation
(d) None of the above

Q3. Why is sound heard with more intensity through CO2 than through the air?
(a) Density of CO2 is more than that of air
(b) Density of CO2 is less than that of air
(c) Air is bad conductor of heat
(d) CO2 is a compound, but air is a mixture of gases.

Q4. Consider the following parts of spectra
 1. Visible
 2. Infrared
 3. Ultraviolet
 4. Microwave Which one of the following is the correct sequence in which their wavelengths increase?
(a) 4 – 3 – 1 – 2
(b) 4 – 1 – 2 – 3
(c) 3 – 2 – 1 – 4
(d) 3 – 1 – 2 – 4

Q5. SONAR is mostly used by
(a) Doctors
(b) Engineers
(c) Astronauts
(d) Navigators

Q6. Which of the following statements is/are true regarding a light wave travelling from air to glass?
 1. Its frequency remains unchanged.
 2. Its speed changes. Select the correct answer using the code given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Nether 1nor 2

Q7. Which one of the following is the correct angle between the incident and reflected rays when a ray of light incident normally on a plane mirror?
(a) 180°
(b) 90°
(c) 45°
(d) 0°

Q8. What is the power of the lens, if the far point of a short-sighted eye is 200 cm?
(a) – 0. 5 D
(b) 2 D
(c) 1 D
(d) – 1.5 D

Q9.  DIRECTIONS : The following questions consist of two statements, Statement I and Statement II. You are to examine these two statements carefully and select the answer to these items using the codes given below.
58. Statement I: Convex mirror is used as a driver mirror.
Statement II: Images formed by convex mirror are diminished in size.
(a) Both the statements individually true and Statement II is the correct explanation of Statement I.
(b) Both the statements are individually true but Statement II is not correct explanation of Statement I.
(c) Statement I is true but Statement II is false.
(d) Statement I is false but Statement II is true.

Q10. Which one of the following is the correct statement? For an open circuit, the value of load,
(a) would be infinite
(b) would be zero
(c) depends on the voltage of the source
(d) depends on other components of circuit

Q11. A wire has a resistance of 32 ohm’s. It is melted and drawn into a wire of half of its original length. What is the resistance of the new wire?
(a) 32 ohm’s
(b) 16 ohm’s
(c) 8 ohm’s
(d) 4 ohm’s

Q12. A house, served by a 220 V supply line, is protected by a 9A fuse. What is the maximum number of 60 watt bulbs that can be turned on in parallel?
(a) 11
(b) 22
(c) 33
(d) 44

 1. (a)2. (b)3. (a)4. (d)5. d6. (c)7. (d)8. (a)9. (b)10. (a)11. (c)12.

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