Jamb Physics 1997 Past Questions and Answers

Question 26:

• JAMB 1997

The colours seen in the thin films of oil on the road and in soap bubbles are due to

A. Reflection
B. Interference
C. Diffraction
D. Polarization

Question 27:

• JAMB 1997

If the load at the end of a sonometer wire is immersed in a bucket of water, the original fundamental frequency of the wire could be restored by

A. Decrease the length of the wire
B. Increasing the length of the wire
C. Increasing the mass per unit length of the wire
D. Changing the temperature of the wire

Question 28:

• JAMB 1997

A boy on looking into a mirror observed that his face appeared to have grown bigger. The boy must have been looking at a

A. Convex mirror with his face at the focus
B. Concave mirror with his face between the focus and the mirror
C. Concave mirror with his face at the focus
D. Convex mirror with his face between the focus and the mirror

Question 29:

• JAMB 1997

Light of velocity 3 x 10⁸ms^-1 is incident on a material of reflective of index n. If the velocity of light is reduced to 2.4 x 10⁸ms^-1 in the material, what is n?

A. 2.33
B. 2.25
C. 1.33
D. 1.25

Question 30:

• JAMB 1997

The electromagnetic waves that are sensitive to temperature changes are

A. X-rays
B. Gamma-rays
C. Ultra-violet rays
D. Infra-red rays