Post Utme Physics Past Questions and Answers

Question 146:

4g of radioactive material of half-life 10days is spilled on a laboratory floor. How long would it take to disintegrate 3.5g of the material?

A. 11/4 days
B. 8 1/4 days
C. 30 days
D. 80 days

Question 147:

Which of the following statements correctly describe(s) cathode rays?
I. They consist of tiny particles carrying negative electric charges
II. They are deflected in a magnetic field but not in an electric field
III. They consist of fast-moving neutrons and are deflected in an electric field

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

Question 148:

Which of the following is most strongly deflected by a magnetic field?

A. γ-rays
B. ∝-rays
C. β-particles
D. X-rays

Question 149:

Which of the following is a set of vectors?

A. Force, mass and momentum
B. Acceleration, velocity and momentum
C. Mass, weight and density
D. Mass, volume and density

Question 150:

A catapult used to hold a stone of mass \(500 \mathrm{~g}\) is extended by \(20 \mathrm{~cm}\) with an applied force, F. If the stone leaves with a velocity of \(40 \mathrm{~m} / \mathrm{s}\), the value of \(F\) is ____________

A. \(4.0 \times 10^{2} \mathrm{~N} / \mathrm{m}^{2}\)
B. \(2.0 \times 10^{3} \mathrm{~N}\)
C. \(4.0 \times 10^{3} \mathrm{~N}\)
D. \(4.0 \times 10^{4} \mathrm{~N}\)