Jamb Physics 1991 Past Questions and Answers

Question 41:

• JAMB 1991

When an atom loses or gains a charge, it becomes

A. An electron
B. An ion
C. A neutron
D. A proton

Question 42:

• JAMB 1991

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

A. 1\(\frac{1}{4}\) days
B. 8\(\frac{1}{4}\) days
C. 30 days
D. 80 days

Question 43:

• JAMB 1991

In a nuclear fusion process, four protons each of mass M_p were fused to produce a nucleus X of mass M_x. Which of the following equations is CORRECT?

A. 4M_p > M_x
B. 4M_p = M_x
C. 4M_p < M_x
D. M_p > M_x

Question 44:

• JAMB 1991

Which of the following are True for \(\alpha\)-decay. i. mass number, decrease by four. ii. Atomic number decreases by two. iii. mass number does not change.

A. I and ii only
B. Ii and iii only
C. I and iii only
D. I, ii, and iii only

Question 45:

• JAMB 1991

Which of the following phenomena is called photoelectric effect?

A. High energy electrons impinge on a metalic anode which then emits photons
B. A high energy photon emits photons as it slowed down
C. A metal absorbs quanta of light and then emits electrons
D. Two electrons are created from a quantum of light