Important Questions NDA
1. Which one among the following is an electrochemical cell that cannot be charged?
A. Electrolytic
B. Storage cell
C. Primary cell
D. Fuel cell
Ans. (C)
2. Which one among the following is the correct order of power consumption for light of equal intensity?
A. CFL tube < Fluorescent tube < Incandescent bulb < Light emitting diode
B. Light emitting diode < CFL tube < Fluorescent tube < Incandescent bulb
C. CFL tube < Fluorescent tube < Light emitting diode < Incandescent bulb
D. Incandescent bulb < Light emitting diode < Fluorescent tube < CFL tube
Ans. (B)
3. One feels heavier in a lift when the lift
A. is going down steadily
B. just begins to go up
C. is moving up steadily
D. descends freely
Ans. (B)
4. A swinging pendulum has its maximum acceleration at
A. the bottom of the swing
B. the two extremities of the swing
C. every point on the swing
D. no particular portion of the pendulum
Ans. (B)
5. Which one among the following statements about thermal conductivity is correct?
A. Steel > Wood > Water
B. Wood > Water > Wood
C. Water > Steel > Wood
D. Water > Wood > Steel
Ans. (B)
6. The process of nuclear fusion in the sun requires
A. very high temperature and very high pressure
B. low temperature and high pressure
C. high temperature and low pressure
D. very high temperature and no pressure
Ans. (A)
7. In India, distribution of electricity for domestic purpose is done in the form of
A. 220 V; 50 Hz
B. 110 V: 60 Hz
C. 220 V: 60 Hz
D. 110 V: 50 Hz
Ans. (A)
8. The earth’s magnetic field is approximately
A. 1 Tesla
B. 2 Gauss
C. 104 Tesla
D. 1 Gauss
Ans. (D)
9. Yellow colour light is used as fog light because yellow colour
A. light is most scattered by fog
B. has the longest wavelength among all colours
C. has the longest wavelength among all colours except red and orange but the red colour is already used for brake light and stop light whereas orange colour is avoided due to its similarly with red
D. has the shortest wavelength among all colours not already reserved for other purpose
Ans. (C)
10. A hot object losses heat to its surroundings in the form of heat reduction. The rate of loss of heat depends on the
A. temperature of the object
B. temperature of the surroundings
C. temperature differences between the objects and its surroundings
D. average temperature of the objects and its surroundings
Ans. (C)
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