Physics Past Questions and Answers

The ice point of an ungraduated mercury-in-glass thermometer is X, while its steam point is 90^o. This thermometer reads 60^o when the true temperature is 40^oC Calculate the value of X.

A 60^o
B 48^o
C 40^o
D 30^o

Question 662:

Iron at 30^oC feels colder to the hand than wood at 28^oC because

A Their linear expansivities are not equal.
B The temperature of the iron is higher than that of the wood
C Iron is a better radiator of heat than wood
D Iron conducts heat more quickly from the hand than wood

Question 663:

An iron rod of length 50m and at a temperature of 60^oC is heated to 70^oC. Calculate its new length. (Linear expansivity of iron = 1.2 x 10^-5K^-1)

A 50.006m
B 50.060m
C 51.600m
D 51.200m

Question 664:

The heat capacity of a substance is the energy

A Required to raise the temperature of a unit mass of the substance by one degree.
B Required to raise the temperature of the substance by one degree
C Absorbed by the substance at constant temperature
D Lost by a unit mass of the substance.

Question 665:

The temperature of a piece of metal of mass 9 g is raised from 10^oC to 110^oC when it absorbs 108J of heat energy. Determine the specific heat capacity of the metal in J kg^-1K^-1

A 1.2
B 12.0
C 120.0
D 1200.0