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RRB NTPC Exam General Awareness Study Material

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Physics

A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum.

a) Just after its dropped
b) When it is just on the half - way
c) Just before it touches the ground
d) When it touches the ground

✔Answer

✔Solution

Correct Answer Is : Just before it touches the ground

Solution Is : When the stone is dropped from the roof of a house towards the ground, the kinetic energy (when an object is in motion) of the stone will be maximum just before it touches the ground because as the body falls, its potential energy decreases but at the same time kinetic energy increases simultaneously by an eqal amount while going downward.

Hydraulic machines work under the principle of

a) Newton`s Law
b) Joules Law
c) Pascal`s Law
d) Floatation Law

✔Answer

✔Solution

Correct Answer Is : Pascal`s Law

Solution Is : The anser is `Pascal`s Law`

A radioactive substance has a half-life of four months. Three-fourth of the substance will decay in

a) 6 months
b) 8 months
c) 12 months
d) 4 months

✔Answer

✔Solution

Correct Answer Is : 8 months

Solution Is : If a radioactive substance has a half-life of four months, three-fourth of the substance will decay in 8 months .

Red light is used in traffic signal for stopping the traffic because

a) it is visible even to longsight people
b) Eye is more sensitive to red light
c) It is least scattered and hence can be easily noticed from long distance
d) It is very pleasant to the eye

✔Answer

✔Solution

Correct Answer Is : It is least scattered and hence can be easily noticed from long distance

Solution Is : Red light is used in traffic signal for stopping the traffic because it is least scattered and hence can be easily noticed from long distance .

The property which is seen in light waves but not in sound waves is

a) Interference
b) Diffraction
c) Refraction
d) Polarization

✔Answer

✔Solution

Correct Answer Is : Polarization

Solution Is : Polarization is a property of light wave . It is absent in sound waves .

The source of energy in the sun is

a) Nuclear fission
b) Nuclear fusion
c) Radioactivity
d) Electrical energy

✔Answer

✔Solution

Correct Answer Is : Nuclear fusion

Solution Is : Nuclear fusion is the source of energy in sun .Whan fusion takes place extreme energy is released.Atom bomb also works on this phenomena

Which one of the following materials is used a s controller in a nuclear reactor power generator?

a) Cadmium
b) Beryllium
c) Graphite
d) Heavy water

✔Answer

✔Solution

Correct Answer Is : Cadmium

Solution Is : Cadium rods are used as controller in a nuclear reactor power generator.Heavy water is used as a moderator

Banking of curves on road on railway track is done to provide

a) Centripetal force
b) Centrifugal force
c) Gravitational force
d) Angular velocity

✔Answer

✔Solution

Correct Answer Is : Centripetal force

Solution Is : Banking of curves on road on railway track is done to provide centripetal force

Which of the following is a good conductor of heat but bad conductor of electricity?

a) Asbestos
b) Celluloid
c) Paraffin Wax
d) Mice

✔Answer

✔Solution

Correct Answer Is : Mice

Solution Is : Mica` is a good conductor of heat and bad conductor of electricity

For which of the following substances, the resistance decreases with the increase in temperature?

a) Copper
b) Nichrome
c) Platinum
d) Pure Silicon

✔Answer

✔Solution

Correct Answer Is : Pure Silicon

Solution Is : We use silicon material in integrated circuits because when the temperature via these chips increases the resistance decreases.

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RRB NTPC Exam General Awareness Study Material

Physics

A stone is dropped from the roof of a house towards the ground. The kinetic energy of the stone will be maximum.

Correct Answer Is : Just before it touches the ground

Hydraulic machines work under the principle of

Correct Answer Is : Pascal`s Law

Solution Is : The anser is `Pascal`s Law`

A radioactive substance has a half-life of four months. Three-fourth of the substance will decay in

Correct Answer Is : 8 months

Solution Is : If a radioactive substance has a half-life of four months, three-fourth of the substance will decay in 8 months .

Red light is used in traffic signal for stopping the traffic because

Correct Answer Is : It is least scattered and hence can be easily noticed from long distance

Solution Is : Red light is used in traffic signal for stopping the traffic because it is least scattered and hence can be easily noticed from long distance .

The property which is seen in light waves but not in sound waves is

Correct Answer Is : Polarization

Solution Is : Polarization is a property of light wave . It is absent in sound waves .

The source of energy in the sun is

Correct Answer Is : Nuclear fusion

Solution Is : Nuclear fusion is the source of energy in sun .Whan fusion takes place extreme energy is released.Atom bomb also works on this phenomena

Which one of the following materials is used a s controller in a nuclear reactor power generator?

Correct Answer Is : Cadmium

Solution Is : Cadium rods are used as controller in a nuclear reactor power generator.Heavy water is used as a moderator

Banking of curves on road on railway track is done to provide

Correct Answer Is : Centripetal force

Solution Is : Banking of curves on road on railway track is done to provide centripetal force

Which of the following is a good conductor of heat but bad conductor of electricity?

Correct Answer Is : Mice

Solution Is : Mica` is a good conductor of heat and bad conductor of electricity

For which of the following substances, the resistance decreases with the increase in temperature?

Correct Answer Is : Pure Silicon

Solution Is : We use silicon material in integrated circuits because when the temperature via these chips increases the resistance decreases.

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