Jamb Physics 1981 Past Questions and Answers

Question 11:

• JAMB 1981

An inclined plane of angle \(\theta\), acting as a simple machine, has a velocity ratio

A. Sin\(\theta\)
B. \(\frac{1}{\text{sin}\theta}\)
C. Cos\(\theta\)
D. \(\frac{1}{\text{cos}\theta}\)
E. Sin\(\theta cos\theta\)

Question 12:

• JAMB 1981

Heat may be transferred by conduction, convection and radiation. By which of these methods does heat travel through vacuum?

A. Conduction only
B. Convection only
C. Radiation only
D. Non of these methods

Question 13:

• JAMB 1981

Which of the following statements is applicable to a real image formed by a concave mirror? i. it can be observed on a screen ii. it is always inverted and in front of the mirror iii. it only seams to exist IV. it is formed by the actual converging of rays of light

A. I, ii and iii
B. I, ii and iv only
C. I and ii only
D. I and ii only
E. All four statements

Question 14:

• JAMB 1981

Which of the following is NOT an effect that can be produced by an electric current?

A. Heat
B. Light
C. Sound
D. Motion
E. None of the above

Question 15:

• JAMB 1981

A cell of e.m.f 2V and internal resistance 1\(\Omega\) supplies a current of 0.5 amps to a resistance whose value is

A. 0.5\(\Omega\)
B. 1\(\Omega\)
C. 2\(\Omega\)
D. 2.5\(\Omega\)
E. 3\(\Omega\)