Assertion: A needle placed carefully on the surface of the water may float, whereas a ball of the same material will always sink.

Reason: The buoyancy of an object depends both on the material and shape of the object

Both assertion and reason are true and the reason is the correct explanation of the assertion

Both assertion and reason are true but the reason is not the correct explanation of the assertion

Assertion is true but the reason is false

Spherical balls of radius R are falling in a viscous fluid of viscosity Ƞ with a velocity v. The retarding viscous force acting on the spherical ball is ___________

Directly proportional to R but inversely proportional to v

Directly proportional to both radius R and velocity v

Inversely proportional to both radius R and velocity v

Inversely proportional to R but directly proportional to velocity v

Assertion: A hydrogen filled balloon stops using after it has attained a certain height in the sky.

Reason: The atmospheric pressure decreases with height and becomes zero when maximum height is attained.

Both assertion and reason are true and the reason is the correct explanation of the assertion

Both assertion and reason are true but the reason is not the correct explanation of the assertion

Assertion is true but the reason is false

Explore topic-wise MCQs in Engineering Physics Questions and Answers.

This section includes 4 Mcqs, each offering curated multiple-choice questions to sharpen your Engineering Physics Questions and Answers knowledge and support exam preparation. Choose a topic below to get started.

1.	Assertion: A needle placed carefully on the surface of the water may float, whereas a ball of the same material will always sink.
A.	Reason: The buoyancy of an object depends both on the material and shape of the object
B.	Both assertion and reason are true and the reason is the correct explanation of the assertion
C.	Both assertion and reason are true but the reason is not the correct explanation of the assertion
D.	Assertion is true but the reason is false
E.	Assertion and reason is false
Answer» D. Assertion is true but the reason is false

Discussion

2.	Spherical balls of radius R are falling in a viscous fluid of viscosity Ƞ with a velocity v. The retarding viscous force acting on the spherical ball is ___________
A.	Directly proportional to R but inversely proportional to v
B.	Directly proportional to both radius R and velocity v
C.	Inversely proportional to both radius R and velocity v
D.	Inversely proportional to R but directly proportional to velocity v
Answer» C. Inversely proportional to both radius R and velocity v

Discussion

3.	A solid weight 6kg in air. If its density is 2000kgm-3, what will be its apparent weight in water?
A.	6kg
B.	2kg
C.	3kg
D.	5kg
Answer» D. 5kg

Discussion

4.	Assertion: A hydrogen filled balloon stops using after it has attained a certain height in the sky.
A.	Reason: The atmospheric pressure decreases with height and becomes zero when maximum height is attained.
B.	Both assertion and reason are true and the reason is the correct explanation of the assertion
C.	Both assertion and reason are true but the reason is not the correct explanation of the assertion
D.	Assertion is true but the reason is false
E.	Assertion and reason is false
Answer» D. Assertion is true but the reason is false

Discussion

Explore topic-wise MCQs in Engineering Physics Questions and Answers.

Assertion: A needle placed carefully on the surface of the water may float, whereas a ball of the same material will always sink.

Spherical balls of radius R are falling in a viscous fluid of viscosity Ƞ with a velocity v. The retarding viscous force acting on the spherical ball is ___________

A solid weight 6kg in air. If its density is 2000kgm-3, what will be its apparent weight in water?

Assertion: A hydrogen filled balloon stops using after it has attained a certain height in the sky.