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RRB NTPC Exam General Awareness Study Material

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Physics

The sky appears blue because

a) All colours interfere to produce blue
b) In white light, the blue component dominates
c) The atmosphere scatters blue colour more than the others
d) It is actually blue

✔Answer

✔Solution

Correct Answer Is : The atmosphere scatters blue colour more than the others

Solution Is : The sky appears blue because the atmosphere scatters blue colour more than the others.

The device in communication satellites which receives signals from an earth station and transmits them to different directions is

a) Transformer
b) Transistor
c) Transponder
d) Transducer

✔Answer

✔Solution

Correct Answer Is : Transponder

Solution Is : The device in communication satellites which receives signals from an earth station and transmits them to different directions is Transponder.

When a ship enters the sea from a river

a) It rises a little
b) It sinks a little
c) It remains at the same level
d) It rises or sinks depending on the material it Is made of

✔Answer

✔Solution

Correct Answer Is : It rises a little

Solution Is : When a ship enters the sea from a river it rises a little.

Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen ?

a) The heavier mass will reach greater height
b) The lighter mass will reach greater height
c) Both will reach the same height
d) Any of them may reach greater height

✔Answer

✔Solution

Correct Answer Is : Both will reach the same height

Solution Is : Two stones of unequal masses are thrown vertically up with the same velocity. Both will reach the same height.

Kaiga11 plant which supplies electricity is a

a) Hydel project
b) Coal project
c) Nuclear power reactor
d) None of the above

✔Answer

✔Solution

Correct Answer Is : Coal project

Solution Is : Kaiga11 plant which supplies electricity is a Coal project.

The scientist who first sent electromagnetic waves to distant places is

a) James Clerk Maxwell
b) Heinrich Hertz
c) Thomas Alva Edison
d) John Logic Baird

✔Answer

✔Solution

Correct Answer Is : James Clerk Maxwell

Solution Is : The scientist who first sent electromagnetic waves to distant places is James Clerk Maxwell.

Direct conversion of solar energy with use of a photovoltaic cell results in the production of

a) Optical energy
b) Electrical energy
c) Thermal energy
d) Mechanical energy

✔Answer

✔Solution

Correct Answer Is : Electrical energy

Solution Is : Direct conversion of solar energy with use of a photovoltaic cell results in the production of electrical energy.

A man inside an artificial satellite feels weightlessness necause the force of attraction due to earth is

a) Zero at that place
b) Is balanced by the force of attraction due to moon
c) Equal to the centripetal force
d) Non-effective due to particular design of sattelite

✔Answer

✔Solution

Correct Answer Is : Equal to the centripetal force

Solution Is : A man inside an artificial satellite feels weightlessness necause the force of attraction due to earth is equal to the centripetal force

Super Nova ` is

a) A comet
b) An asteroid
c) An exploding star
d) A black hole

✔Answer

✔Solution

Correct Answer Is : An exploding star

Solution Is : Super Nova` is an exploding star.

For a ray of light the sutter total internal reflection in has to pass from

a) Glass of water
b) Water of glass
c) Air to water
d) Air to glass

✔Answer

✔Solution

Correct Answer Is : Glass of water

Solution Is : Total internal reflection is a phenomenon that happens when a ray of light stricks a medium boundary at an angle larger then the angle of incidence above which toral internal reflectons occurs with respect to the surface. It will occur only when the ray of light passes through glass to other medium.

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RRB NTPC Exam General Awareness Study Material

Physics

The sky appears blue because

Correct Answer Is : The atmosphere scatters blue colour more than the others

Solution Is : The sky appears blue because the atmosphere scatters blue colour more than the others.

The device in communication satellites which receives signals from an earth station and transmits them to different directions is

Correct Answer Is : Transponder

Solution Is : The device in communication satellites which receives signals from an earth station and transmits them to different directions is Transponder.

When a ship enters the sea from a river

Correct Answer Is : It rises a little

Solution Is : When a ship enters the sea from a river it rises a little.

Two stones of unequal masses are thrown vertically up with the same velocity. Which of the following will happen ?

Correct Answer Is : Both will reach the same height

Solution Is : Two stones of unequal masses are thrown vertically up with the same velocity. Both will reach the same height.

Kaiga11 plant which supplies electricity is a

Correct Answer Is : Coal project

Solution Is : Kaiga11 plant which supplies electricity is a Coal project.

The scientist who first sent electromagnetic waves to distant places is

Correct Answer Is : James Clerk Maxwell

Solution Is : The scientist who first sent electromagnetic waves to distant places is James Clerk Maxwell.

Direct conversion of solar energy with use of a photovoltaic cell results in the production of

Correct Answer Is : Electrical energy

Solution Is : Direct conversion of solar energy with use of a photovoltaic cell results in the production of electrical energy.

A man inside an artificial satellite feels weightlessness necause the force of attraction due to earth is

Correct Answer Is : Equal to the centripetal force

Solution Is : A man inside an artificial satellite feels weightlessness necause the force of attraction due to earth is equal to the centripetal force

Super Nova ` is

Correct Answer Is : An exploding star

Solution Is : Super Nova` is an exploding star.

For a ray of light the sutter total internal reflection in has to pass from

Correct Answer Is : Glass of water

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