Jamb Physics 1981 Past Questions and Answers

Question 21:

• JAMB 1981

All of the following frequencies are overtones of 320 Hz EXCEPT

A. 960Hz
B. 640Hz
C. 520Hz
D. 1280Hz
E. 1600Hz

Question 22:

• JAMB 1981

The driver in a motor car, of which the total mass is 800kg and which is traveling at 20ms^-1, suddenly observes a stationary dog in his path 50m ahead. If the car brakes can exert a force of 2000N, what will most likely happen?

A. The car will be able to stop immediately the driver notices the dog
B. The car will stop 3pm after hitting the dog
C. The car will stop 20m in front of the dog
D. The driver will quickly reverse the car
E. The car will stop 5m beyound the dog

Question 23:

• JAMB 1981

The absolute refractive indices of glass and water are \(\frac{3}{2}\) and \(\frac{4}{3}\) respectively. The refractive index at the interface when a ray travels from water to glass is

A. \(\frac{1}{2}\)
B. \(\frac{8}{9}\)
C. \(\frac{9}{8}\)
D. \(\frac{17}{12}\)
E. 2

Question 24:

• JAMB 1981

Which of the following statements is CORRECT?

A. Charges generated on glass rubbed with silk are called negative
B. Charges in various media can be carried by protons detached from their atom
C. The magnitude of any charge is a multiple of the charge of an electron
D. The intensity of an electric field is a scalar quantity
E. If 500 joules of work are required to move a 2-coulomb charge between two points, the potential difference between the two point is 100V

Question 25:

• JAMB 1981

Which type of radiation does not NOT originate within the nucleus?

A. Alpha
B. Beta
C. Gamma
D. Neutron
E. X-rays