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JAMB Physics Past Questions & Answers - Page 301

1,501.

If a room is saturated with water vapour, the temperature of the room must be

at 0^oC

above the dew point

at 100^oC

below or at the dew point

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

1,502.

Heat is supplied to a test tube containing 100g of ice at its melting point. The ice melts completely in 1 min.What is the power rating of the source of heat? [Latent heat of fusion of ice = 336Jg^-1]

336W

450W

560W

600W

View answer & explanation

Correct answer is C

p x t = heat energy

P x 1 x 60 = 100 x 336

p = 560W

1,503.

When 100g of liquids L1 at 78°C was mixed with Xg of liquid L2 at 50°C, the final temperature was 66°C. Given that the specific heat capacity of L2is half that of L1, find x

50g

100g

150g

200g

View answer & explanation

Correct answer is C

Heat lost by L1 = heat gained by L2

cL1 = 2cL2

100 x 2cL2 x (78 - 66)

= xg x cL2 x (66 - 50)

xg = 150g

1,504.

A Motor Tyre is inflated to pressure of 2.0 x 10⁵Nm^-2 when the temperature of air is 27^oC. What will be the pressure in it at 87^oC assuming that the volume of the Tyre does not change?

2.6 x 10⁵Nm^-2

2.4 x 10⁵Nm^-2

2.2 x 10⁵Nm^-2

1.3 x 10⁵Nm^-2

View answer & explanation

Correct answer is B

$\frac{p_1}{T_1}$ = $\frac{p_2}{T_2}$

$\frac{2 \times 10^5}{27 + 273}$ = $\frac{p_2}{87 + 273}$

P₂ = 2.4 x 10⁵Nm^-2

1,505.

The melting point of naphthalene is 78^oC. What is this temperature in kelvin

100k

351k

378k

444k

View answer & explanation

Correct answer is B

T = 78 + 273

= 351k

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