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.

2,201.

A rectangular block of wood floats in water with two-thirds of its volume immersed. When placed in another liquid, it floats with half of its volume immersed. Calculate the relative density of the liquid

A.

1.43

B.

1.33

C.

1.00

D.

0.83

E.

0.75

Correct answer is B

from the first statement, mg = \(\frac{2}{3}Vp_wg\) ........................1

from second statement, mg = \(\frac{1}{2}Vp_lg \)...................2

equating equations 1 and 2    we have that 

\(\frac{2}{3}Vp_wg\) = \(\frac{1}{2}Vp_lg\)

\(\frac{4}{3} = \frac{p_l}{p_w}\)

= 1.33

2,202.

The term torque means

A.

the moment

B.

the resultant of several forces acting on a body in equilibrium

C.

two equal and oposite forces whose lines of action do not coincide

D.

two coplaner forces at right angles to each other

E.

the equilibrant of two concurrent forces

Correct answer is A

No explanation has been provided for this answer.

2,203.

A piece of stone attached to one end of a string is whirled round in a horizontal circle. When the string is suddenly cut, the stone will

A.

move towards the centre of the circle

B.

stop moving immediately

C.

move along a circular path of smaller radius

D.

fly off in a direction tangential to the circular path

E.

acquire greater centripetal force

Correct answer is D

No explanation has been provided for this answer.

2,204.

During the same interval, it is observed that a train travels the same distance as does a lorry. The two vehicles therefore have the same

A.

uniform acceleration

B.

instantaneous velocity

C.

initial velocity

D.

average speed

E.

average velocity

Correct answer is D

No explanation has been provided for this answer.

2,205.

which of the following pairs of physical quantities comprises vectors?

A.

capacitance and inductance

B.

force ratio and velocity ratio

C.

friction and momentum

D.

energy and power

E.

electric field potential and electric field intensity

Correct answer is C

Friction and Momentum both have magnitudes and directions.