Physics Past Questions and Answers

On a cold day, a concrete floor feels colder to the bear foot then a mat on the same floor because the

A Is better conductor of heat than the foot
B Mat loses heat to the bare foot at a faster rate
C Mat is better conductor of heat than the floor
D Concrete floor is a better conductor of heat than the mat

Question 3167:

When a metal ball is heated through 30^oC,its volume becomes 1.0018cm³. If the linear expansivity of the material of the ball is 2.0 x 10^-5 K^-1, calculate its original volume

A 1.0000cm³
B 1.0020cm³
C 1.0036cm³
D 1.0180cm³

Question 3168:

A faulty barometer reads 72.6cm Hg when the atmospheric pressure is 75.0cm Hg. Calculate the atmospheric pressure when the barometer reads 72.0cn Hg

A 79.4cm Hg
B 74.38cm Hg
C 74.2cm Hg
D 69.4cm Hg

Question 3169:

On a basis of the kinetic theory, an increase in the temperature of a fixed volume of an ideal gas causes

A A incease in the number of gas molecules
B A decrease in the density of the gass
C An increase in the average speed of the gas molecules
D A decrease in pressure exerted by the gas

Question 3170:

The temperature of 900cm³ of an ideal gas at a pressure of 114cm Hg is 27^oC. Calculate its volume at 76cm Hg and 0^oC

A 50.0cm³
B 546.0cm³
C 659.3cm³
D 1228.5cm³