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.

3,442.

A stream of alpha particles is projected into an electric field between two plates X and Y as shown in the diagram above. Which of the following is correct? The particles are

A.

accelerated and they continue in a straight line

B.

directionally reversed at the end of the plates

C.

deflected towards plate Y

D.

attracted by both plates

E.

deflected towards plate X.

Correct answer is C

No explanation has been provided for this answer.

3,443.

A gas has a volume of 546 cm3 at OoC. What is the volume of the gas at- 100oC if its pressure remains constant?

A.

346cm3

B.

446cm3

C.

546cm3

D.

646cm3

E.

746 cm3.

Correct answer is A

V1/T1
=
V2/T2

546/273
=
V2/273 - 100

V2 = 346cm3

3,444.

A solid metal cube of side 10 cm is heated from
10oC to 60oC. lf the linear expansivity of the metal is 1.2 x 105K-1, calculate the increase in its volume.

A.

0.6cm3

B.

1.2 cm3

C.

1.8 cm3

D.

3.6 cm3

E.

6.0cm3.

Correct answer is C

Δv = 3αvΔθ = 3 x 1.2 x 10-5 x 1000
X(60 – 10) = 1.8cm

3,445.

The expansion of solids can be considered a disadvantage in the

A.

fire alarm system

B.

thermostat

C.

riveting of steel plates

D.

balance wheel of a watch

E.

fitting of wheels on rims.

Correct answer is D

No explanation has been provided for this answer.