Post Utme Physics Past Questions and Answers

Question 206:

The half-life of a radioactive element is 9 days. Calculate the fraction that remains after 36 days.

A. \(1 / 32\)
B. \(1 / 16\)
C. \(1 / 4\)
D. \(15 / 32\)

Question 207:

One of the features of the fission process is that ____________

A. It leads to chain reaction
B. Its products are not radioactive
C. Neutrons are \(p\) not released
D. Mass and' energy are conserved

Question 208:

Two stones P and Q of different masses were projected horizontally at different angles of 15℃ and 75℃ respectively but with the same velocity.

The ranges covered by the stones will be ____________

A. Greater for P
B. Greater for Q
C. Same for P and Q
D. Greater for the heavier of the two stones

Question 209:

If the torque on a body is zero, the angular momentum of the body will ____________

A. Decrease continuously to zero
B. Increase then decrease to zero
C. Be constant
D. Increase continually

Question 210:

For which of the following quantities is the derived unit \(\mathrm{ML}^{2} \mathrm{~T}^{-2}\) correct?
I. Moment of force
II. Acceleration
III. Work
IV. Momentum

A. I and II
B. I and III
C. Ill and W
D. II only