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JAMB Physics Past Questions & Answers - Page 179

891.

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

the number of turns in the coil

the strength of the magnet

the speed at which the magnet is moved

all of the above

none of the above

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

892.

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

24k

55k

40k

26k

32k

View answer & explanation

Correct answer is A

Energy (kWhr) = 1 x 200 x 24 x 10-3

= 4.8kWhr

1 kWhr. cost 5k

4.8kwhr. will cost (5 x 4.8)k

= 24 kobo

893.

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

36A

12A

24A

10A

View answer & explanation

Correct answer is C

since they are in parallel, the same voltage across

= I₁ = I₂ = I₃

I₁ = $\frac{V}{R_1}$

$\frac{60}{5}$ = 12A

894.

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

less than R₁

greater than R₂

the sum of R₁ and R₂

the difference of R₂ and R₁

greater thanR₁ but less than R₂

View answer & explanation

Correct answer is A

No explanation has been provided for this answer.

895.

The heat from the sun reaches the earth by the process

insulation

precipitation

conduction

convection

radiation

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

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