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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.

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1,796.

A relative density bottle of volume 50cm³ is completely filled with a liquid at 30^oC. It is then heated to 80^oC such that 0.75cm³ of the liquid is expelled. Calculate the apparent cubic expansivity of the liquid.

0.00030k^-1

0.00032k^-1

0.01970k^-1

0.02030k^-1

View answer & explanation

Correct answer is A

Ya = $\frac{\text{Vol. expelled}}{\text{Vol. left x temp. change}} = \frac{0.75}{49.25 \times 50}$

= 0.00030k^-1

1,797.

A cube made of metal of linear expansivity $\alpha$ is heated through a temperature $\theta$ . If the initial volume of the cube is V_o, the correct expression for the increase in volume of the cube is

$\frac{1}{3} \alpha V_o \theta$

$\frac{1}{2} \alpha V_o \theta$

$2 \alpha V_o \theta$

$3 \alpha V_o \theta$

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,798.

Which of the following statements distinguishes thermal conduction for convection?

i. Conduction requires a material medium while convection does not
ii. In convection, there is actual motion of hot material, while in conduction, molecules molecules vibrates faster about their mean positions
iii. Conduction takes place in solids while convection takes place in fluids.

i and ii only

ii and iii only

i and iii only

i, ii and iii

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,799.

The ice and steam point on a mercury-in-glass thermometer are 10cm and 30cm respectively. Calculate the temperature in degree Celsius when the mercury meniscus is the 14cm mark

20^oC

30^oC

34^oC