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Physics questions and answers

Physics Questions and Answers

If you want to learn more about the nature and properties of matter and energy or you're simply preparing for a Physics exam, these Physics past questions and answers are ideal for you.

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2,866.

An object of mass 400g and density 600kgm^-3 is suspended with a sting so that half of it is immersed in paraffin of density 900kgm^-3. The tension in the string is

A.

1.0N

B.

3.0N

C.

4.0N

D.

5.0N

View answer & explanation

Correct answer is B

volume of object = $\frac{400 \times 10^{-2}}{600}$

= 0.00067m³

volume of paraffin displaced = $\frac{1}{2}$ x 0.00067

= 0.00034m³

mass of paraffin = 900 x 34 x 10^-5

= 0.3kg

weight of paraffin = 0.3 x 10

= 3N = upthrust = tension in the string

2,867.

A weightless vessel of dimensions 4m x 3m x 2m is filled with a liquid of density 1000kgm^-3 and sealed. What is the maximum pressure this container can exert on a flat surface? [g = 10ms^-2]

A.

9 x 10⁴NM^-2

B.

4 x 10⁴NM^-2

C.

3 x 10⁴NM^-2

D.

2 x 10⁴NM^-2

View answer & explanation

Correct answer is D

P = 2 x 1000 x 10

= 2 x 10⁴NM^-2

2,868.

A plane inclined at angle $\theta$ has a velocity ratio of 10 : 1. The inclination of the plane to the horizontal is given by

A.

tan $\theta$ = $\frac{1}{10}$

B.

cot $\theta$ = $\frac{1}{10}$

C.

cos $\theta$ = $\frac{1}{10}$

D.

sin $\theta$ = $\frac{1}{10}$

View answer & explanation

Correct answer is D

V.R = $\frac{1}{sin\theta}$

= 10

sin = $\frac{1}{10}$

2,869.

Which of the following correctly describes the energy changes in the generation of light by a hydroelectric power station?

A.

Electrical $\to$ mechanical $\to$ potential

B.

potential $\to$ mechanical $\to$ electrical $\to$ light

C.

mechanical $\to$ sound $\to$ electrical $\to$ light

D.

mechanical $\to$ sound $\to$ electrical $\to$ light

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

2,870.

The force experienced by an object of mass 60.0kg in the moon's gravitational field is 1.002 x 10²N. What is the intensity of the gravitational field?

A.

0.60Nkg^-1

B.

1.67Nkg^-1

C.

6.12 x 10²Nkg^-1

D.

9.81ms^-2

View answer & explanation

Correct answer is B

Intensity = $\frac{1.002 \times 102}{60}$

= 1.67Nkg^-1

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