Physics Test 31

Result

Physics Test 31

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Weekly Quiz Competition

Question 1
4 / -1

STATEMENT – 1
Two particles moving in the same direction do not lose all their energy in a completely inelastic collision.
STATEMENT – 2
Principle of conservation of momentum holds true for all kinds of collisions.

A
Statement – 1 is True, Statement – 2 is False.

B
Statement – 1 is True, Statement – 2 is True; Statement – 2 is a correct explanation for Statement – 1.

C
Statement – 1 is True, Statement – 2 is True; Statement – 2 is not the correct explanation for Statement – 1.

D
Statement – 1 is False, Statement – 2 is True.

Solution

In completely inelastic collision, the two particles stick together but they do not lose all of their energies. Law of conservation of momentum is valid in all type of collision. The law is valid for even inelastic collision.
Question 2
4 / -1

Which one of the following represents the correct dimensions of the coefficient of viscosity

A
ML⁻¹T⁻²

B
MLT⁻¹

C
ML⁻¹T⁻¹

D
ML⁻²T⁻²

Solution

Dimensions of η (coefficient of viscosity)
= ML⁻¹T^{−1

Use the formula: η = Force per unit area/ velocity gradient}
Question 3
4 / -1

Which of the following statements is correct for any thermodynamic system?

A
The internal energy changes in all processes.

B
Internal energy and entropy are state functions.

C
The change in entropy can never be zero.

D
The work done in an adiabatic process is always zero.

Solution

Internal energy does not change in isothermal process. As can be zero for adiabatic process. Work done in adiabatic process may benon-zero.
Question 4
4 / -1

When npn transistor is used as amplifier

A
electrons move from base to collector

B
holes move from emitter to base

C
electrons move from collector to base

D
holes move from base to emitter

Solution

When npn transistor is used, majority charge carrier electrons of n type emitter move from emitter to base and then base to collector.