1
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

The Poisson's ratio of a material is 0.1. If the longitudinal strain of a rod of this material is $$10^{-3}$$, then the percentage change in the volume of the rod will be

A
0.008%
B
0.08%
C
0.8%
D
8%
2
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A satellite can be in a geostationary orbit around a planet if it is at a distance R from the centre of the planet. If the planet starts rotating about its axis with double the angular velocity, then to make the satellite geostationary, its orbital radius should be

A
$$2R$$
B
$$\frac{R}{2}$$
C
$$\frac{R}{2^{1/3}}$$
D
$$\frac{R}{4^{1/3}}$$
3
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

When a $$p$$-$$n$$ junction diode is connected in forward bias, its barrier potential

A
decreases and less current flows in the circuit
B
decreases and more current flows in the circuit
C
increases and more current flows in the circuit
D
decreases and no current flows in the circuit
4
COMEDK 2020
MCQ (Single Correct Answer)
+1
-0

A ball floats on the surface of water in a container exposed to the atmosphere. When the container is covered and the air is partially removed, then the ball

A
rises
B
gets immersed more in water
C
remains immersed at its former depth
D
may rise or sink
EXAM MAP