Jamb Physics 1978 Past Questions and Answers

Question 36:

• JAMB 1978

A herdsman yelling out to fellow herdsman heard his voice reflected by cliff 4s later. What is the velocity of sound in air if the cliff is 680m away?

A. 170ms^-1
B. 136ms^-1
C. 340ms^-1
D. 680ms^-1
E. 510ms^-1

Question 37:

• JAMB 1978

an object 1cm high placed on the axis 15cm from a converging lens forms an image 30cm from the lens. The size of the image is

A. 0.5cm
B. 1.5cm
C. 3cm
D. 2.5m
E. 2cm

Question 38:

• JAMB 1978

The visible part of light consists of the following colours

A. Red, indigo, infra-red, violet, yellow, green and blue
B. Red, green, blue, violet, indigo, orange and yellow
C. Blue, ultra-violet, infra-red, red, yellow, indigo, violet,green and orange
D. Infra-red and ultra-violet
E. Red, orange, yellow, green, blue, indigo and infra-red

Question 39:

• JAMB 1978

An object is positioned between two plane mirrors inclined at right angles to each other. The object is 1 unit distance from each mirror, the number of images formed is

A. 1
B. 2
C. 3
D. 4
E. 5

Question 40:

• JAMB 1978

The angular dispersion of a prism depends on

A. The index of refraction only
B. The angle of incidence as well as the index of refraction
C. The angle of incidence only
D. The thickness of the prism
E. The prism angle