Processing math: 100%

JAMB Physics Past Questions & Answers - Page 192

956.

A cell has an open circuit voltage V₁ and a closed circuit voltage V₂ when a current is flowing through it. Therefore, the internal resistance of the cell is

$\frac{V_2}{I}$

$\frac{V_1}{I}$

$\frac{(V_1 + V_2)}{I}$

$\frac{(V_1 - V_2)}{I}$

$\frac{(V_2 - V_1)}{I}$

View answer & explanation

Correct answer is E

On open circuit, V₁ = I; On closed circuit V₂ = IR + Ir

V₂ = V₁ + Ir

r = $\frac{(V_2 - V_1)}{I}$

957.

A man stands one-third of the way between two walls and claps his hands, He hears two distinct echoes 1s apart. If the speed of sound is 330ms^-1, the distance between the wall is

33m

110m

220m

330m

495m

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

958.

The ratio of the linear expansivity of copper to that of iron is approximately 1.5. A specimen of iron and a specimen of copper expands by the same amount per unit rise in temperature. The ratio of their length is

1.5

1.32

0.67

View answer & explanation

Correct answer is E

$\alpha_1$ L1 = $\alpha_2$ L2

$\frac{L_1}{L_2}$ = $\frac{\alpha_1}{1.5\alpha_2}$ (since a1- 1.5 $\alpha_2$ )

$\frac{L_1}{L_2}$ = 0.67

959.

A calorimeter of thermal capacity 80j contains 20g of water at 25°C. Water at 100°C is added so that the final temperature of the set-ups is 50°C. The amount of water added is (Heat capacity of water = 4.18J/g/°C)

20g

25g

45g

50g

100g

View answer & explanation

Correct answer is A

Heat lost = heat gained

mc $\theta$ = c $\theta$ + mc $\theta$

m x 4.18 x (100 - 50) = 80(50 -25) + [20 x 4.18] x (50 - 25)

m = 20g

960.

Which of the following elements is the best absorber of X-rays?

hydrogen

oxygen

calcium

copper

lead

View answer & explanation

Correct answer is E

No explanation has been provided for this answer.

JAMB Subjects

Literature in English

Islamic Religious Knowledge

Christian Religious Knowledge

Aptitude Tests

Numerical Reasoning Questions and Answers

Microsoft Office Questions and Answers

Nigeria General Knowledge Questions and Answers

Quantitative Reasoning Questions and Answers

Data Interpretation Questions and Answers

Personality Test

Verbal Reasoning Questions and Answers

Logical Reasoning Questions and Answers

Puzzles Questions and Answers

Situational Judgement Questions and Answers

Typing Speed and Accuracy Test

Spatial Reasoning Questions and Answers

Abstract Reasoning Questions and Answers

See all →

View latest jobs in Nigeria today