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Delhi Police Exam General Knowledge Study Material

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General Physics

The cloud float in the atmosphere because of their low

a) Temperature
b) Velocity
c) Pressure
d) Density

✔Answer

Correct Answer Is : Temperature

Solution Is :

The change of a solid into vapour directly is called

a) Vaporization
b) Freezing
c) Melting
d) Sublimation

✔Answer

Correct Answer Is : Sublimation

Solution Is :

The audible frequency range of a human ear is

a) 20 Hz to 200 Hz
b) 2 Hz to 20 Hz
c) 200 Hz to 2000 Hz
d) 20 Hz to 20000 Hz

✔Answer

Correct Answer Is : 20 Hz to 20000 Hz

Solution Is :

The wavelength of X-rays is of the order of

a) 1 mm
b) 1 cm
c) 1 micron
d) 1 angstrom

✔Answer

Correct Answer Is : 1 angstrom

Solution Is :

Who discovered wireless communication ?

a) Hertz
b) Maxwell
c) Marconi
d) Newton

✔Answer

Correct Answer Is : Marconi

Solution Is :

Q.Which instrument is used for the measurement of angular distances between two objects?

a) Sexant
b) Telstar
c) Spherometer
d) Refractometer

✔Answer

Correct Answer Is : Sexant

Solution Is :

The Outer part of a Railway track near the bend or a curve is generally raised

a) To prevent the fast wear and tear of the railway track.
b) To produce the necessary centripetal force
c) To produce the necessary gravitational force
d) To enhance the speed of train

✔Answer

Correct Answer Is : To produce the necessary centripetal force

Solution Is :

Q.What are Sunspots?

a) These are great flames of gases which shoot out of the sun
b) These are cooler areas which move about on the sun`s surface and show up as dark spots.
c) These are areas of the Sun where the heat is most intense which shown up as dark spots
d) These are areas of the Sun where nuclear fission takes place.

✔Answer

Correct Answer Is : These are cooler areas which move about on the sun`s surface and show up as dark spots.

Solution Is :

The number of images of an object formed by two mirrors inclined at an angle of 60° is

a) 6
b) 5
c) 4
d) 7

✔Answer

Correct Answer Is : 5

Solution Is :

What is the technology used in a compact disc?

a) Electrical
b) Laser
c) Electro magnetic
d) Aeronautical

✔Answer

Delhi Police Exam General Knowledge Study Material

General Physics

The cloud float in the atmosphere because of their low

Correct Answer Is : Temperature

Solution Is :

The change of a solid into vapour directly is called

Correct Answer Is : Sublimation

Solution Is :

The audible frequency range of a human ear is

Correct Answer Is : 20 Hz to 20000 Hz

Solution Is :

The wavelength of X-rays is of the order of

Correct Answer Is : 1 angstrom

Solution Is :

Who discovered wireless communication ?

Correct Answer Is : Marconi

Solution Is :

Q.Which instrument is used for the measurement of angular distances between two objects?

Correct Answer Is : Sexant

Solution Is :

The Outer part of a Railway track near the bend or a curve is generally raised

Correct Answer Is : To produce the necessary centripetal force

Solution Is :

Q.What are Sunspots?

Correct Answer Is : These are cooler areas which move about on the sun`s surface and show up as dark spots.

Solution Is :

The number of images of an object formed by two mirrors inclined at an angle of 60° is

Correct Answer Is : 5

Solution Is :

What is the technology used in a compact disc?

Correct Answer Is : Laser

Solution Is :

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