If a machine is lubricated with oil ___________

Both its mechanical advantage and efficiency increases

The mechanical advantage of the machine increases

The mechanical efficiency of the machine increases

Both its mechanical advantage and efficiency increases

Its efficiency increases, but its mechanical advantage decreases

In an elastic collision of two billiard balls, the total kinetic energy is conserved ___________

For a long duration but not completely

Comets mover around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet s velocity in general. Yet the work done by the gravitational force over every orbit of the comet is zero. Why?

The gravitational force is non-conservative, hence work done is zero

The gravitational force is conservative, hence work done is zero

The gravitational force is non-conservative, hence work done is zero

Energy is absent, hence work done is zero

Explore topic-wise MCQs in Engineering Physics.

This section includes 6 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics knowledge and support exam preparation. Choose a topic below to get started.

1.	If a machine is lubricated with oil ___________
A.	The mechanical advantage of the machine increases
B.	The mechanical efficiency of the machine increases
C.	Both its mechanical advantage and efficiency increases
D.	Its efficiency increases, but its mechanical advantage decreases
Answer» C. Both its mechanical advantage and efficiency increases

Discussion

2.	Two masses of 1g and 4g are moving with equal kinetic energy. The ratio of the magnitudes of their momenta is ___________
A.	4:1
B.	2:1
C.	1:2
D.	1:16
Answer» D. 1:16

Discussion

3.	The mechanical energy of a system is always conserved.
A.	True
B.	False
Answer» C.

Discussion

4.	In an elastic collision of two billiard balls, the total kinetic energy is conserved ___________
A.	Completely
B.	For a short duration
C.	For a long duration but not completely
D.	Never
Answer» C. For a long duration but not completely

Discussion

5.	An artificial satellite orbiting the earth in very thin atmosphere loses its energy gradually due to dissipation against atmospheric resistance, however small. As it comes closer and closer to earth, its speed ___________
A.	Decreases progressively
B.	Remains constant
C.	Becomes non-uniform
D.	Increases progressively
Answer» E.

Discussion

6.	Comets mover around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet s velocity in general. Yet the work done by the gravitational force over every orbit of the comet is zero. Why?
A.	The gravitational force is conservative, hence work done is zero
B.	The gravitational force is non-conservative, hence work done is zero
C.	Energy is absent, hence work done is zero
D.	Force is in negative direction
Answer» B. The gravitational force is non-conservative, hence work done is zero

Discussion

Explore topic-wise MCQs in Engineering Physics.

If a machine is lubricated with oil ___________

Two masses of 1g and 4g are moving with equal kinetic energy. The ratio of the magnitudes of their momenta is ___________

The mechanical energy of a system is always conserved.

In an elastic collision of two billiard balls, the total kinetic energy is conserved ___________

An artificial satellite orbiting the earth in very thin atmosphere loses its energy gradually due to dissipation against atmospheric resistance, however small. As it comes closer and closer to earth, its speed ___________

Comets mover around the sun in highly elliptical orbits. The gravitational force on the comet due to the sun is not normal to the comet s velocity in general. Yet the work done by the gravitational force over every orbit of the comet is zero. Why?