1
NDA General Ability 4 September 2022
MCQ (Single Correct Answer)
+4
-1.33
Change Language
A simple pendulum having bob of mass m and length of string l has time period of T. If the mass of the bob is doubled and the length of the string is halved, then the time period of this pendulum will be
A
T
B
T / $\sqrt2$
C
2T
D
$\sqrt2$T
2
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
3
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
4
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. 
EXAM MAP
Medical
NEETAIIMS
Graduate Aptitude Test in Engineering
GATE CSEGATE ECEGATE EEGATE MEGATE CEGATE PIGATE IN
Civil Services
UPSC Civil Service
Defence
NDA
Staff Selection Commission
SSC CGL Tier I
CBSE
Class 12