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JAMB Physics Past Questions & Answers - Page 172

856.

A fixed mass of gas of volume 600cm³ at a temperature of 27^oC is cooled at constant pressure to a temperature of 0^oC. What is the change in volume?

54cm²

273cm²

300cm²

546cm²

600cm²

View answer & explanation

Correct answer is A

$\frac{V_1}{T_1} = \frac{V_2}{T_2}$

T₂ = 0 + 273 = 273k

V₁ = 600

T₁ = 27 + 273 = 300k

V₂ = $\frac{V_1T_2}{T_1}$ = 546cm

V₁ - V₂ = 54cm

857.

The set-up illustrated above shows a capillary tube of uniform cross-sectional area in two different arrangements. Using the data in the diagrams. Calculate the pressure of the atmosphere

76cm of Hg

75cm of Hg

74cm of Hg

60cm of Hg

45cm of Hg

View answer & explanation

Correct answer is B

P₁ = p + 15, p₂ = p - 15

v₁ = 30cm, v₂ = 45cm

P₁v₁ = p₂v₂

p = 75cm of Hg

858.

A water fall is 420m high. Calculate the difference in temperature of the water between the top and bottom of the water fall. Neglect heat loses(g = 10.0m-2 specific heat capacity of water = 4.20 x 10 $^3$ JKg-1 K-1)

0.1^oC

1.0^oC

42^oC

100^oC

4.20^oC

View answer & explanation

Correct answer is B

Potential Energy = Heat Energy

mgh = Mc $\Delta \theta = \frac{gh}{c} = \frac{10 \times 240}{4.20 \times 10^3}$

= 1.0oC

859.

A wire, 20m long is heated from a temperature of 5°C to 55°C. If the change in length is 0.020m, calculate the linear expansivity of the wire

1.0 x 10^-3k^-1

2.0 x 10^-4k^-1

2.0 x 10^-5k^-1

1.0 x 10^-5k^-1

2.0 x 10^-6k^-1

View answer & explanation

Correct answer is C

$\alpha = \frac{\Delta L}{L \Delta \theta} = \frac{0.020}{20 \times (55 - 5)} = 2.0 \times 10^{-5}$

860.

The diagram above represents six maximum and minimum thermometer. If the temperature of the surrounding falls, which of the following correctly states how the thermometer would respond to the change in temperature?

S₁, would move upward but S₂ would not move

S₁ would not move but S₂ would move upwards

both S₁ and S₂ would move upwards

S₁ would move downwards and S₂ would move downwardw

S₁ would move downwards and S₂ wouldnmove downwards

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

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