Processing math: 100%

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

Click here to get our updates directly on your WhatsApp

391.

Which of the following instruments consumes the highest current?

I. Electric iron

II. Television set

III. Torch light

IV. Immersion heater

250v

220v

110v

1kW

110W

30W

500W

III

View answer & explanation

Correct answer is C

(I) I = $\frac{P}{V} = \frac{1000}{25}$ = 4A

(II) I = $\frac{110}{220}$ = 0.5A

(III) I = $\frac{30}{6}$ = 5A

(IV) I = $\frac{500}{110}$ = 4.55A

392.

In the figure, the value of R is

3 $\Omega$

6 $\Omega$

4 $\Omega$

5 $\Omega$

View answer & explanation

Correct answer is B

R $_T$ = $\frac{V}{1} = \frac{12}{2}$ = 6 $\Omega$

R $_T$ = 3 + $\frac{R \times 6}{R + 6}$

R = 6 $\Omega$

393.

In an experiment in which molten naphthalene is allowed to cool, the cooling curve i n the figure was obtained. The temperature 80 $^o$ C is known as the

cooling temperature

boiling point

melting point

vaporization point

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

394.

The fiqure above represents a block-and-tackle pulley system on which an effort of W Newtons supports a load of 120.0N. If the efficiency of the machine is 40 $^o$ , then the value of W is

28.0N

48.0N

288.0N

50.0N

View answer & explanation

Correct answer is D

V.E = 6, load = 120N

Efficiency = M.A x $\frac{1}{V.R}$ x 100%

40 = $\frac{120}{effort}$ x $\frac{1}{6}$ x $\frac{100}{1}$

Effort = 50N

395.

Two divers G and H are at depths 20m and 40m, respectively below the water surface in a lake. The pressure on G is p $_1$ while the pressure on H is P $_2$ , If the atmospheric pressure is equivalent to 10m of water, then the value of P $_2$ /P $_1$ is?

0.50

0.60

1.67

2.00

View answer & explanation

Correct answer is C

Atmospheric pressure equivalence of 10m of water
: $\frac{p_2+10}{p_1+10}$

= $\frac{40+10}{20+10$

= $\frac{50}{30}$ = 1.67

Sub-categories

JAMB

Aptitude Tests

Logical Reasoning Questions and Answers

Nigeria General Knowledge Questions and Answers

Personality Test

Situational Judgement Questions and Answers

Quantitative Reasoning Questions and Answers

Typing Speed and Accuracy Test

Spatial Reasoning Questions and Answers

Puzzles Questions and Answers

Microsoft Office Questions and Answers

Numerical Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

Data Interpretation Questions and Answers

Verbal Reasoning Questions and Answers

See all →

Interview Questions & Answers

View latest jobs in Nigeria today