Explore topic-wise MCQs in Physics.

This section includes 7 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

At constant pressure P the volume of a gas increases from V1 to V2 when Q amount of heat is removed from the system. What will happen to internal energy?

A. Remain the same if Q = P(V<sub>1</sub> V<sub>2</sub>)
B. Decrease by an amount P(V<sub>2</sub> V<sub>1</sub>) Q
C. Decrease by an amount Q + P(V<sub>2</sub> V<sub>1</sub>)
D. Increase by some unknown amount
Answer» D. Increase by some unknown amount
Discussion
2.

A disc spinning with 24J of kinetic energy is kept in a container containing a fluid having a heat capacity of 2000J/K. When the disc comes to rest what will be the change in internal energy if U = 3.5 T.

A. 0
B. 0.042J
C. 0.021J
D. 0.028J
Answer» C. 0.021J
Discussion
3.

Consider a gas contained in a rigid container of volume 20m3. What will be the change in internal energy if 50J of heat is provided to it? Assume the gas exerts a pressure of 1atm on the walls.

A. 50J
B. 0
C. 70J
D. 20J
Answer» B. 0
Discussion
4.

A block of mass 1kg is given a velocity of 5m/s on a horizontal flat surface. What will be the change in internal energy of the block-surface system, when the block comes to rest. The coefficient of kinetic friction is 0.3 and coefficient of static friction is 0.4.

A. 25J
B. 12.5J
C. 0
D. 30J
Answer» C. 0
Discussion
5.

If 315cal of heat is given to the system, and the system does 20cal of work, find the change in internal energy.

A. 295cal
B. 335cal
C. 0 cal
D. 335J
Answer» B. 335cal
Discussion
6.

First law of thermodynamics is based on?

A. Conservation of energy
B. Conservation of mass
C. Conservation of momentum
D. Conservation of work
Answer» B. Conservation of mass
Discussion
7.

U=0 means that the process is isothermic. True or False?

A. True
B. False
Answer» B. False
Discussion