Jamb Physics 1978 Past Questions and Answers

Question 21:

• JAMB 1978

The heat from the sun reaches the earth by the process

A. Insulation
B. Precipitation
C. Conduction
D. Convection
E. Radiation

Question 22:

• JAMB 1978

Two resistors R1 and R2 are connected in parallel, R2 being greater than R1. The combined resistance is

A. Less than R₁
B. Greater than R₂
C. The sum of R₁ and R₂
D. The difference of R₂ and R₁
E. Greater thanR₁ but less than R₂

Question 23:

• JAMB 1978

Three 5 ohms resistors connected in parallel have a potential difference of 60v. applied across the combination. The current in each resistor is

A. 4A
B. 36A
C. 12A
D. 24A
E. 10A

Question 24:

• JAMB 1978

If NEPA charges 5k per kWhr, what is the cost of operating for 24 hours a lamp required 1A on a 200v line?

A. 24k
B. 55k
C. 40k
D. 26k
E. 32k

Question 25:

• JAMB 1978

A magnet is moved through a coil of wire. The e.m.f. produced in the wire depends on

A. The number of turns in the coil
B. The strength of the magnet
C. The speed at which the magnet is moved
D. All of the above
E. None of the above