JAMB Physics Past Questions & Answers

126.

A gas at a volume of V $_{0}$ in a container at pressure p $_{0}$ is compressed to one-fifth of its volume. What will be its pressure if the magnitude of its original temperature T is constant?

$\frac{p_{0}} {5}$

$\frac{4p_{0}}{5}$

p $_{0}$

5P $_{0}$

View answer & explanation

Correct answer is D

p $_{1}$ = P $_{0}$ , V $_{1}$ = V $_{0}$ , V $_{2}$ = $\frac{1}{5}$ V $_{0}$ P $_{2}$ = ?

P $_{1}$ V $_{1}$ = P $_{2}$ V $_{2}$

P $_{2}$ = $\frac{P_{1}V_{1}}{V_{1}}$

= $\frac{\not P_{o}V_{o}}{\frac{1}{5}P_{o}}$ = 5 $\not P_{o}$

127.

When the temperature of a liquid increases, its surface tension

decreases

increases

remains constant

increases then decreases

View answer & explanation

Correct answer is A

Surface tension decreases by:

* Increasing liquid's temperature

* Adding soap to the liquid

128.

A solid weighs 10.00N in air, 6N when forcefully immersed in water, and 7.0N when fully immersed in a liquid, X. Calculate the relative density of the liquid X.

$\frac{5}{3}$

$\frac{4}{3}$

$\frac{3}{4}$

$\frac{7}{10}$

View answer & explanation

Correct answer is C

R.D = $\frac{\text {weigh in air - weigh in liquid X}}{\text {weigh in air - weigh in water}}$

= $\frac{10 - 7}{10 - 6} = \frac{3}{4}$

129.

If the stress on a wire is 10 $^{7}$ NM $^{-2}$ and the wire is stretched from its original length of 10.00m to 10.05m. The young's modulus of the wire is?

5.0 x 10 $^{-4}$ Nm $^{-2}$

5.0 x 10 $^{-5}$ Nm $^{-2}$

2.0 x 10 $^{-8}$ Nm $^{-2}$

2.0 x 10 $^{9}$ Nm $^{-2}$

View answer & explanation

Correct answer is D

Young's modulus $\frac{stress}{strain}$

Strain = $\frac{e}{l} = \frac{0.05}{10} = \frac{10^{7}}{0.005}$

2 x 10 $^{9}$ Nm $^{-2}$

130.

When the breaks in a car are applied, the frictional force on the tyres is?

a disadvantage because it is in the direction of the motion of the car

a disadvantage because it is in the opposite direction of the motion of the car

an advantage because it is in the direction of the motion of the car

an advantage because it is in the opposite direction of the motion of the car

View answer & explanation

Correct answer is D

Frictional force opposes motion

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