Question 26:

• JAMB 1978

The following are some units i. Ns ii. Mm iii. Nm^-2 iv. J^oK^-1. What are the units of latent heat?

A. I
B. Ii
C. Iii
D. Iv

Question 27:

• JAMB 1978

The heat from the sun reaches the earth by the process

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

Question 28:

• 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 29:

• 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 30:

• 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