Waec Physics 1989 Past Questions and Answers

Question 21:

• WAEC 1989

A short chain is usual attached to the back of a petrol tanker trailing behind it to ensure that the

A. Petrol tanker is balanced on the wh eel
B. Heat generated by friction in the engine can be conducted to the floor
C. Charges generated by friction in the tanker can be conducted to the earth
D. The tanker moves slowly as the chain touches the floor
E. Chain produces sound for the resonance of the tanker engine

Question 22:

• WAEC 1989

A ray of light is incidence on a plane mirror at an angle of 35^o. What is the angle by the reflected ray with the surface of the mirror?

A. 125^o
B. 70^o
C. 65^o
D. 55^o
E. 35^o

Question 23:

• WAEC 1989

The image in a pine-hole camera is always

A. Diminished
B. Enlarged
C. Upright
D. Inverted
E. Blurred

Question 24:

• WAEC 1989

The refractive index of a given transparent medium is 1.4. Which of the following is the minimum internal angle for total internal reflection to take place in the medium?

A. 30^o
B. 36^o
C. 44^o
D. 46^o
E. 54^o

Question 25:

• WAEC 1989

The distance between a node and an anti-node for a transverse wave is equal to

A. The wavelength
B. Thrice the wavelength
C. One-half of the wavelength
D. One-quater of the wavelength
E. Three quaters of the wavelength