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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.

1,556.

An object of height 2.5cm is places 20cm from a convex mirror of focal length 10cm. Calculate the height of its image.

A.

2.5 cm

B.

3.0cm

C.

5.0cm

D.

25.0cm

Correct answer is A

1v=1f1u

= 11012=120

v = 20

but hi = v×hou

= 20×2.520

= 2.5cm

1,557.

Which of the following properties of waves is exclusive to transverse waves?

A.

reflection

B.

interference

C.

diffraction

D.

polarization

Correct answer is D

No explanation has been provided for this answer.

1,558.

When two waves are superimposed on each other, the following occurrences are possible, except

A.

nodal lines

B.

anti nodal lines

C.

stationary waves

D.

dispersion

Correct answer is D

No explanation has been provided for this answer.

1,559.

Which of the following factors decreases the rate of evaporation of a liquid?

A.

increase in pressure over the liquid

B.

lowering the boiling point

C.

decreasing in humidity

D.

wind

Correct answer is A

No explanation has been provided for this answer.

1,560.

A piece of copper of mass 20g at a temperature of 110°C was dropped into a mixture of ice and water at 0°C. If the final steady temperature of the mixture is 0°C . Calculate the amount of ice that melted [Specific heat capacity of copper = 0.4 Jg1K1, specific latent heat of fusion of ice = 330Jg1]

A.

0.37g

B.

0.60g

C.

2.40g

D.

2.70g

Correct answer is D

Mice = MCθ

= \(\frac{20 \times 0.4 \times 110}{330} 

Heat lost by copper = Heat gained by ice

mcopper c θ = mice L

20 x 0.4 x (110 - 0) = mice x 330

mice = 20×0.4×110330

= 83

= 2.67 g

= 2.70g (to 1 d.p)