Elementary Modern Physics - Jamb Physics Past Questions and Answers

Question 36:

• JAMB 1990

The number of neutrons contained in the nucleus \(^{238}_{92}U\) is

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

Question 37:

• JAMB 1990

A substance has a half of 3mins. after 6mins. the count rate was observed to be 400. What was its count rate at zero time?

A. 200
B. 1200
C. 1600
D. 2400

Question 38:

• JAMB 1990

The photocell works on the principle of the

A. Voltaic cell
B. Emision of electrons by incident radiation
C. Emision of protons by incident electrons
D. Photographic plate

Question 39:

• JAMB 1991

which of the following statements are TRUE of isotopes? i. isotopes of an element have the same chemical properties because they have the same number of electrons. ii. isotopes of elements are normally separated using physical properties. iii. isotopes of an element have the same number of protons in their nuclei.

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

Question 40:

• JAMB 1991

When an atom loses or gains a charge, it becomes

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