Jamb Physics 1994 Past Questions and Answers

Question 16:

• JAMB 1994

A Motor Tyre is inflated to pressure of 2.0 x 10⁵Nm^-2 when the temperature of air is 27^oC. What will be the pressure in it at 87^oC assuming that the volume of the Tyre does not change?

A. 2.6 x 10⁵Nm^-2
B. 2.4 x 10⁵Nm^-2
C. 2.2 x 10⁵Nm^-2
D. 1.3 x 10⁵Nm^-2

Question 17:

• JAMB 1994

When 100g of liquids L1 at 78°C was mixed with Xg of liquid L2 at 50°C, the final temperature was 66°C. Given that the specific heat capacity of L2is half that of L1, find x

A. 50g
B. 100g
C. 150g
D. 200g

Question 18:

• JAMB 1994

Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg^-1]

A. 336W
B. 450W
C. 560W
D. 600W

Question 19:

• JAMB 1994

If a room is saturated with water vapour, the temperature of the room must be

A. At 0^oC
B. Above the dew point
C. At 100^oC
D. Below or at the dew point

Question 20:

• JAMB 1994

Two similar kettles containing equal masses of boiling water are placed on a table. If the surface of one is highly polished and the surface of the other is covered with soot, Which of the following observations is correct

A. The two kettles will cool down at the same rate
B. The polished kettle cools down more quickly by conduction
C. The kettle covered with soot cools down more quickly because it is a good radiator
D. The kettle covered with soot cools down more quickly by the process of heat convection