Jamb Physics 1980 Past Questions and Answers

Question 26:

• JAMB 1980

Heat is supplied to a block of ice 0^o until half of it has melted. Which of the following statements is true?

A. The temperature rises and the ice exoands
B. The temperature remains constant and the volume of ice decreases
C. The ice gives out heat as it melts
D. The mass remains constant and the temperature increases
E. The mass decreases because some heat is lost to the atmosphere

Question 27:

• JAMB 1980

If the volume of a fixed mass of a gas is kept constant, the pressure of the gas

A. Is inversely proprotional to its centigrade temperature
B. Is inversely proportional to its absolute temperature
C. Is directly proportional to its centigrade temperature
D. Is directly proportional to its absolute temperature
E. Remains constant also

Question 28:

• JAMB 1980

Which of the following statements about sound is NOT true?

A. Sound is a longitudinal wave
B. Sound can be reflected and refracted like light
C. Sound travels through a vacuum
D. Sound moves faster in a steel wire than in air
E. Sound can ony be produced by vibrating objects

Question 29:

• JAMB 1980

In a compound microscope

A. There is only one lens
B. The objective lens have a shorter focal length than the eyepiece which is convex
C. The objective lens has a longer focal length than the eyepiece which is convex
D. The objective lens has a shorter focal length than the eyepiece which is concave
E. The objective and the eyepiece are both convex and have the same focal length

Question 30:

• JAMB 1980

In sunlight, a blue flower looks blue because we see the flower by the light it

A. Recieves from our eye
B. Disperses
C. Absorbs
D. Refracts
E. Reflects