# Physics MCQs GK objective Questions GK test Set – 28

## Question 1.

The type of mirror used in automobiles to see the traffic on the rear side is

A. Concave
B.Plano-Convex
C. Plane
D. Convex

A. Concave B.Plano-Convex C. Plane D. Convex

## Question 2.

In total internal reflection, the light travel from

A. Rarer to denser medium and it occurs with no loss of intensity
B. Denser to rarer medium and it occurs with no loss of intensity
C. Rarer to denser medium and it occurs with loss of intensity
D. Denser to rarer medium and it occurs with loss of intensity

Ans: B. Denser to rarer medium and it occurs with no loss of intensity

## Question 3.

An optically plane surface reflects a beam of light

A. As a parallel beam in one direction
B. As diffused beams in all directions
C. As parallel beams in all directions
D. As a diffused beam in one direction

Ans: A. As a parallel beam in one direction

## Question 4.

At what temperature do the Fahrenheit and Celsius scales give the same reading?

A. 212 degrees
B. 32 degreees
C. -40 degreees
D. 0 degreees

Ans: C. -40 degreees

## Question 5.

If you look into a mirror and find that the image (your reflection) is smaller than you, then the type of the mirror is:

A. Concave mirror
B. Convex mirror
C. Plano-concave mirror
D. Plane mirror

Ans: B. Convex mirror

## Question 6.

Convex mirrors are used as a rear view mirror in motor cycles because

A. It forms real image
B. It forms erect (upright) image
C. It forms smaller image as compared with object
D. All of the above

Ans: C. It forms smaller image as compared with object

## Question 7.

The focal length of a concave mirror with a radius of curvature of 20.0 cm is :

A. 20 cm
B. 5 cm
C. 10 cm
D. 15 cm

Ans: C. 10 cm

## Question 8.

The temperature of a liquid is 32° F. What is its temperature in Celsius scale?

A. 32° C
B. 0° C
C. 100° C
D. 212° C

Ans: B. 0° C

## Question 9.

Which one of the following reflects back more sunlight as compared to other three?

A. Sand desert
B. Land covered with fresh snow
C. Prairie land

Ans: B. Land covered with fresh snow

## Question 10.

A convex mirror of focal length f (in air) is immersed in a liquid (u=4/3). The focal length of the mirror in the liquid will be :

A. F
B. (4/3)f
C. (3/4)f
D. (7/3)f

Ans: A. F

## Question 11.

The type of mirrors used in the headlamp of cars is

A. Parabolic concave
B. Plane
C. Spherical convex
D. Cylindrical concave

Ans: A. Parabolic concave

## Question 12.

To convert temperature from Celcius to Kelvin scale, you must __ the given temperature.

A. Subtract 273
B. Multiply 273
D. Divide by 273

## Question 13.

After reflection from a plane mirror the word will look like.

A. AMBULANCE
B. ECNALUBMA
C. AMBULA CE
D. AWBULANCE

Ans: B. ECNALUBMA

## Question 14.

The phenomenon which causes mirage is

A. Interference
B. Diffraction
C. Polarisation
D. Total internal reflection

Ans: B. Diffraction

## Question 15.

Shaving mirror is

A. Convex
B. Concave
C. Plane
D. Parabolic

Ans: B. Concave

## Question 16.

0°K is equivalent to

A. 273°C
B. – 273°C
C. 0°C
D. 100°C

Ans: B. – 273°C

## Question 17.

Convex mirror is generally used in __

A. Solar cookers
B. Opthalmoscope
D. Rear view mirror

Ans: D. Rear view mirror

## Question 18.

Rear view mirror of car is convex or concave?

A. Convex
B. Concave
C. Both A & B
D. Can’t be determined

Ans: A. Convex

## Question 19.

What changes will happen to a bowl of ice and water kept at exactly zero degree Celsius ?

A. All ice will melt
B. All water will become ice
C. No change will happen
D. Only some ice will melt

Ans: C. No change will happen

## Question 20.

In very cold countries alcohol is used as a thermometric liquid because

A. Alcohol is a poor conductor of heat
B. Alcohol can be coloured for its level to be seen easily
C. Its freezing point is very low
D. It will not stick to the glass tube

Ans: C. Its freezing point is very low

## Physics GK MCQs all set

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