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.

1,828.

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

A.

0.00030k-1

B.

0.00032k-1

C.

0.01970k-1

D.

0.02030k-1

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

1,829.

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

A.

\(\frac{1}{3} \alpha V_o \theta\)

B.

\(\frac{1}{2} \alpha V_o \theta\)

C.

\(2 \alpha V_o \theta\)

D.

\(3 \alpha V_o \theta\)

Correct answer is D

No explanation has been provided for this answer.