1
NDA General Ability 4 September 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
In which one of the following devices, the light energy is converted into the electrical energy?
A
Light-emitting diode 
B
Laser diode
C
Solar cell
D
Transistor
2
NDA General Ability 4 September 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
SONAR is a device that is used to measure the distance of underwater objects by a ship. Which of the following types of waves does it use for this purpose?
A
Infrasonic waves
B
Sound waves in audible range for human beings
C
Ultrasonic waves
D
All of the above
3
NDA General Ability 4 September 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following statements about the speed of sound waves is not correct?
A
The speed of sound waves in steel is higher than that in water.
B
The speed of sound waves in air decreases with increase in temperature.
C
The speed of sound waves in air increases with increase in temperature.
D
The speed of sound waves in water is higher than that in air. 
4
NDA General Ability 4 September 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
Which one of the following metals is most commonly used for making filament of incandescent electric bulbs?
A
Aluminium
B
Silver
C
Copper
D
Tungsten
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