Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

786.

Which of the following substances lowers the surface tension of water?

A.

metal

B.

sand

C.

detergent

D.

paper

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

787.

A ball is dropped from the top of a tower. Due to air resistance,it reaches terminal velocity. Which of the following statement(s) about its motion is/are correct? i. The acceleration of the ball is zero. ii. The net force on the ball is zero. iii. The velocity of the ball increases.

A.

i only

B.

i and ii only

C.

ii and iii only

D.

i, ii and iii

View answer & explanation

Correct answer is B

Terminal velocity refers to the constant speed that an object reaches as it falls through a liquid or gas.

Since the net force on the object is zero, the object has zero acceleration.

788.

The diagram given, represents the graph of stress against strain for an elastic wire. The point Q on the graph is the

A.

elastic limit

B.

breaking point

C.

yield point

D.

proportional limit

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

789.

A student measures the volume of a liquid using a measuring cylinder. What else needs to be measured by the student in order to determine the density of the liquid?

A.

depth of the liquid in the cylinder

B.

mass of the cylinder

C.

mass of the liquid

D.

temperature of the liquid

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

790.

The dimensions of momentum are

A.

MLT

B.

ML-1T-1

C.

MLT-1

D.

ML-1T

View answer & explanation

Correct answer is C

Momentum = kgms-1 = MLT-1


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