1
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Which one of the following can charge an insulator?
A
Current electricity
B
Static electricity
C
Magnetic field
D
Gravitational field
2
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
At 20$$^\circ$$C, the speed of sound in water is approximately
A
330 m/s
B
800 m/s
C
1500 m/s
D
5000 m/s
3
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Let us consider a copper wire having radius r and length l. Let its resistance be R. If the radius of another copper wire is 2r and the length is l/2, then the resistance of this wire will be
A
R
B
2R
C
R/4
D
R/8
4
NDA 2019 Paper 1
MCQ (Single Correct Answer)
+2.5
-0.83
Basic scientific principle behind a nuclear reactor is
A
nuclear fusion
B
controlled nuclear fusion
C
uncontrolled nuclear fission
D
controlled nuclear fission
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