Waec Physics Past Questions and Answers

Question 41:

• WAEC 1988

A transparent rectangular block 5.0cm thick is placed on a black dot. The dot when viewed from above is seem 3.0cm from the top of the block calculate the refractive index of the material of the block.

A. 2/5
B. 3/5
C. 3/2
D. 5/3
E. 5/2

Question 42:

• WAEC 1988

The velocities of light in air and glass are 3.0 x10\(^8\)ms\(^{-1}\) and 1.8 \(\times \)10\(^8\) ms\(^{-1}\) respectively. Calculate the sine of the angle of incidence that will produce an angle of refraction of 30° for a ray of light incident on glass.

A. 1.2
B. 1.0
C. 0.8
D. 0.6
E. 0.3

Question 43:

• WAEC 1988

An object is placed 36cm from a converging lens of focal length 24cm.If a real image which is 4cm high is formed, Calculate the height of the object.

A. 2.0cm
B. 4.0cm
C. 6.0cm
D. 8.0cm
E. 10.0cm

Question 44:

• WAEC 1988

The ability of the eye to focus objects at different distances is called

A. Power
B. Accommodation
C. Normal vision
D. Persistence of vision
E. Long sight

Question 45:

• WAEC 1988

The change of the direction of a wave-front because of a change in the velocity of the wave in another medium is called

A. Refraction
B. Reflection
C. Diffraction
D. Interference
E. Dispersion