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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.

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