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.

3,581.

Which of the following instruments can be used to compare the relative magnitudes of charges on two given bodies?

A.

The electrophorous

B.

Ebonite rod

C.

Proof plane

D.

Gold leaf electroscope

E.

Capacitor

Correct answer is D

No explanation has been provided for this answer.

3,582.

All the heat generated by a current of 2A passing through a resistor of 6Ω for 2.5s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?

A.

60 Jg-1

B.

120 Jg-1

C.

300 Jg-1

D.

360 Jg-1

E.

1500 Jg-1

Correct answer is B

Electrical Energy = Heat Energy.
I2Rt = ml
22 x 6 25 = 5 x L.
L = 120 Jg-1.

3,583.

A block of ice at its melting point is left on a table in the atmosphere and observed to melt gradually. Which of the following statements is true about the melting process?

A.

the reaction force of the table on the ice breaks the ice into water molecules

B.

heat extracted from the ice block makes the ice block cold

C.

the ice block absorbs heat from the atmosphere and its temperature rises

D.

the atmosphere absorbs heat from the ice block and its temperature falls

E.

the ice block absorbs heat from the atmosphere and its temperature remains constant as it melts

Correct answer is E

The heat of fusion is the quantity of heat necessary to change of a solid to a liquid with no temperature change

3,584.
3,585.

Which of the following substance is not a good conductor of electricity?

A.

Human body

B.

Glass

C.

Aluminium

D.

Earth

E.

Copper

Correct answer is B

No explanation has been provided for this answer.