Explore topic-wise MCQs in Physics.

This section includes 5 Mcqs, each offering curated multiple-choice questions to sharpen your Physics knowledge and support exam preparation. Choose a topic below to get started.

1.

The second law of thermodynamics states that?

A. Entropy of an isolated system can never decrease over time
B. Entropy of a pure crystalline substance at 0K is 0
C. Energy is conserved
D. Entropy of a system can never decrease
Answer» B. Entropy of a pure crystalline substance at 0K is 0
Discussion
2.

Which of the following is the Kelvin Planck statement?

A. Heat from a cold reservoir cannot be transferred to a hot reservoir without external work
B. Efficiency for a reversible cyclic process can be 1
C. Heat from a hot reservoir can be completely converted into work if process is reversible
D. Efficiency of a heat engine is less than 1
Answer» E.
Discussion
3.

Which law of thermodynamics says that efficiency of a heat engine cannot be 1?

A. First
B. Zeroth
C. Second
D. Third
Answer» D. Third
Discussion
4.

According to the first law of thermodynamics, a book lying on a table can fly upwards on its own by using the internal energy of the table. True or False?

A. True
B. False
Answer» B. False
Discussion
5.

A process is carried out between 2 systems. It is possible for entropy of one system to decrease. True or False?

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