Jamb Physics 1985 Past Questions and Answers

Question 46:

• JAMB 1985

Which of the following features is NOT a characteristic of natural radioactivity?

A. Radioactivity is a nuclear phenomenon
B. Radioactivity is exhibited only by elements of mass number greater than 206
C. The radioactivity of an element is affected by electric and magnetic fields in the surroundings
D. Radioactive substances emits three types of radiations, a-rays, \(\beta\)-rays and y-rays
E. The radioactive element is transformed into a new element

Question 47:

• JAMB 1985

What is the number of neutrons in the Uranium isotope \(^{238}_{92}X\)?

A. 92
B. 146
C. 238
D. 330
E. 119

Question 48:

• JAMB 1985

Normal atmospheric pressure at sea-level is 10⁵Nm^-2 and the acceleration due to gravity is approximately 10ms^-1. If the atmosphere has a uniform density of 1kgm^-3, its height is

A. 100m
B. 1000m
C. 10 000m
D. 100 000m
E. 1000 000m

Question 49:

• JAMB 1985

In the Fig above, Current I passes through the combination, if the power dissipated in the 5 ohm resistor is 40W, then the power dissipated in the 10 ohm resistor is

A. 10W
B. 20W
C. 40W
D. 80
E. 100W

Question 50:

• JAMB 1985

The graph in the fig above describes the motion of a particle. the acceleration of the particle during the motion is

A. 0.00ms^-2
B. 0.25ms^-2
C. 4.00ms^-2
D. 8.00ms^-2
E. 10.00ms^-2