Physics Past Questions and Answers

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 372:

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

A 92
B 146
C 238
D 330
E 119

Question 373:

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 374:

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 375:

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