Physics Questions & Answers - Free Online Practice

1,301.

in a light experiment with a convex lens a student plotted a graph as shown above of the reciprocal of object distance (1)/u against the reciprocal of image distance (1)/v . the focal length of the lens is given as

slope of line PQ

Reciprocal of either OP or OQ

Length OP or OQ

area under the graph E ratio OP/OQ

View answer & explanation

Correct answer is B

The intercept on either of the axes of the graph of $\frac{1}{u}$ against $\frac{1}{v}$ gives the value of $\frac{1}{f}$ . Hence, the reciprocal of this intercecpt gives the value of the focal length.

1,302.

The wave motion above has a frequency

0.1Hz

0.2Hz

5Hz

10Hz

100Hz

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

1,303.

The effect of closing the key K in the circuit shown above would be to

increase the current by 0.6A

reduce the current by 0.6A

increase the current by 0.4A

keep the current unchanged

View answer & explanation

Correct answer is C

When K is open, the total resistance

R = 8 $\Omega$ + 2 $\Omega$ = 10 $\Omega$

I = $\frac{V}{R}$ = $\frac{6}{10}$

= 0.6A

When K is closed, we have

$\frac{1}{R}$ = $\frac{1}{8}$ + $\frac{1}{8}$

⇒ $\frac{1}{R}$ = $\frac{1}{4}$

⇒ R = 4 $\Omega$

The total resistance R = 4 $\Omega$ + 2 $\Omega$

= 6 $\Omega$

I = $\frac{6}{6}$

= 1A

Hence, I = 1A - 0.6A = 0.4A increase

1,304.

A body of mass 6kg rests on an inclined plane. The normal reaction is R and the limiting frictional force is F as shown in the image above. if F = 30N, and g = 10ms2 then the angle of inclination $\theta$ is

$15^{\circ}$

$30^{\circ}$

$45^{\circ}$

$60^{\circ}$

$75^{\circ}$

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

1,305.

In the diagram above, a ray of light passes from glass into air, if the angle of incidence in glass is a and angle of refraction in air is $\beta$ which of following statements is true???

$\alpha = \beta$

the efractive index of glass is $\frac{sin\theta}{sin\alpha}$

The ray suffers total internal reflection if $\beta$ is greater than the critical angle

the efractive index of glass is $\frac{sin\alpha}{sin\beta}$

View answer & explanation

Correct answer is D

No explanation has been provided for this answer.

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