Important Physics Questions and answer 1 - 30

 Important Physics Questions and answer 1 - 30

important Physics Questions and Answers .Candidates those who are preparing for SSC CGL and all other competitive

exams can use these questions.

1).The Element of an electric heater is made of____

a) Nichrome

b) Copper

c) Aluminum

d) None of these

Answer is: a)

2).When water is heated from 0o Celsius to 100o Celsius, the volume of water

a) Increase gradually

b) Degrease gradually

c) First increase, then decrease

d) First decrease , then increase

Answer is: d)

3).One mega watt hour (MWH) is equal to

a) 3.6 × 103 joule

b) 3.6 × 104 joule

c) 3.6 × 107 joule

d) 3.6 × 109 joule

Answer is: d)

4).At what temperature are the temperature on Celsius and Fahrenheit scales equal?

a) 273o Celsius

b) - 273o Celsius

c) – 40o Celsius

d) 40o Celsius

Answer is: c)

5).The Period of revolution round the sun is maximum by which among the following

planets?

a) Mercury

b) Venus

c) Earth

d) Mars

Answer is: d)

6).Einstein got the Nobel prize for?

a) Theory of Relativity

b) Photo-electric effect

c) Polarisation

d) Radio activity

Answer is: b)

7).Galvanometer can be converted into a voltmeter by using

a) Low resistance in series

b) High resistance in series

c) Low resistance in parallel

d) High resistance in parallel

Answer is: b)

8).Gas law was given by

a) Boyle

b) Ostwald

c) Arrhenius

d) Faraday

Answer is: a)

9).Kilowatt – hour is a unit of

a) Energy

b) Power

c) Electric charge

d) Current

Answer is: b)

10).The ozone layer protects us from

a) Ultra violet rays

b) Radio waves

c) Visual radiation

d) Infrared radiation

Answer is: a)

11).What will be the temperature of the maximum if 100 gm ice at 0oC is put in 100 gm

water at 80oC? (Latent heat of ice = 80 cal / gm)

a) 35oC

b) 45oC

c) 60oC

d) 0oC

Answer is: d)

12).Fire in the diesel engine is produces by which of the following?.

a) Compression

b) Spark plug

c) Friction

d) Self starter

Answer is: a)

13).With an increase in pressure the melting point of max will.

a) Decrease

b) Increase

c) First increase and then decrease

d) Remain Unaffected

Answer is: b)

14).Which among the following is the best conductor of electricity?

a) Silver

b) Copper

c) Gold

d) Lead

Answer is: a)

15).Which among the following order of decreasing wavelengths of electromagnetic

waves is correct?

I. Radio waves II. Infrared rays III. Visible Light IV. X-Rays

a) II, I, IV, III

b) I, III, II, IV

c) I, II, III, IV

d) IV, III, II, I

Answer is: c)

16).Ampere-hour is the unit of which among the following?

a) Power

b) Energy

c) Intensity of current

d) Amount of charge

Answer is: d)

17).Who discovered X-Rays?

a) Madam Curie

b) Einstein

c) Roentgen

d) J. J. Thomson

Answer is: c)

18).Which among the following are primary colors?

a) Red, Green, Blue

b) Blue, Yellow, Green

c) Red, Magenta, Yellow

d) Yellow, Violet, Blue

Answer is: a)

19).At what temperature will the density of water be maximum?

a) 0o C

b) 32o C

c) - 4o C

d) 4o C

Answer is: d)

20).Persistence of vision is the principle behind?

a) Camera

b) spectroscope

c) Cinema

d) Periscope

Answer is: c)

21).Which metal is commonly used for making an electromagnet?

a) Copper

b) Iron

c) Nickel

d) Cobalt

Answer is: b)

22).Light from the laser is________.

a) Monochromatic

b) Composite

c) Dispersed light

d) Incoherent

Answer is: a)

23).Choke is used to_______.

a) Reduce the current in AC circuit

b) Reduce the current in DC circuit

c) Convert AC to DC

d) Convert DC to AC

Answer is: a)

24).In a standing wave the distance between a node and adjacent antinode is______.

a) 3λ / 2

b) λ / 2

c) λ / 4

d) 3λ / 4

Answer is: c)

25).A telescope and microscope differ in that______.

a) Both are different instruments

b) Telescope’s eyepiece with longer focal lengths that the oblective

c) Telescope has objective of large focal length and eyepiece of smaller

focal lengths

d) None of these

Answer is: c)

26).The weight of a body is______.

a) The same everywhere on the surface of the earth

b) Maximum at the poles

c) Maximum at the equator

d) More on the hills than in the plains

Answer is: b)

27).At what temperature a body will not radiate any heat energy?

a) 0o C

b) 273o C

c) 100o C

d) -273o C

Answer is: d)

28).Electromagnetic spectrum consists of the following radiations-

I. X-rays

II. Gamma rays

III. Ultraviolet radiations

IV. Infrared radiations

Choose the correct order of code in the increasing order of their frequency:

a) I, III, II, IV

b) II, I, III,IV

c) IV, III, I, II

d) IV, II, III, I

Answer is: c)

29).Only one part of moon can be seen from earth because____.

a) Only one part reflects light

b) It does not rotate

c) The period of rotation and revolution are equal

d) None of these

Answer is: c)

30).Parsec is a unit of_______.

a) Pressure

b) Astronomical distance

c) Time

d) Energy

Answer is: b)