Waec Physics 1996 Past Questions and Answers

Question 31:

• WAEC 1996

A ray of light is incident on a glass block as shown in the diagram above. If the reflected and the retracted rays are perpendicular to each other, what is the refractive index of the glass relative to air.?

A. 1.65
B. 1.58
C. 1.52
D. 1.50
E. 1.48

Question 32:

• WAEC 1996

When a ray of light is incident normally on an air- glass interface, its angle of refraction is

A. 0^o
B. 42^o
C. 45^o
D. 60^o
E. 90^o

Question 33:

• WAEC 1996

The refractive index of a medium relative to air is 1.8. Calculate the critical angle for the medium to the nearest degree.

A. 18^o
B. 34^o
C. 45^o
D. 68^o
E. 90^o.

Question 34:

• WAEC 1996

A converging lens of focal length 5cm forms a virtual image which is 10cm from the lens. How far from the lens is the object?

A. 2.0cm
B. 3.3cm
C. 5.0cm
D. 10.0cm
E. 15.0cm

Question 35:

• WAEC 1996

Which of the following instruments produces sound by the vibration of air column?

A. Piano
B. Guitar
C. Flute
D. Hand bell
E. Talking drum