Jamb Physics 1987 Past Questions and Answers

Question 41:

• JAMB 1987

Which of the following statements is TRUE of photoelectric effect?

A. It cannot occur in liquids
B. The energy of the emitted electrons is independent of the work function of the surface
C. The energy of the emitted electron depends on the wavelength of the incident light
D. The greater the intensity of the incuident light, the greater the incident of the emitted electron

Question 42:

• JAMB 1987

Isotopes are nuclei which have

A. The same number of nuetrons and electrons
B. Equal number of electrons and protons
C. The same atomic number but different number of neutrons
D. The same number of total particles

Question 43:

• JAMB 1987

A radioactive sample initially contains N atoms. After three half-lives the number of atoms that have disintegrated is

A. \(\frac{N}{8}\)
B. \(\frac{3N}{8}\)
C. \(\frac{5N}{8}\)
D. \(\frac{7N}{8}\)

Question 44:

• JAMB 1987

The velocity time graph above describes the motion of a particle between two points P and Q. What is the distance between P and Q?

A. 17.0m
B. 18.0m
C. 22.5m
D. 30.0m

Question 45:

• JAMB 1987

the fig above shows two connected bodies of masses M1 and M2 in equilibrium under gravity. The tension in the upper string is

A. (m1-m2)g
B. M1g
C. M2g
D. (m1+m2)g