ICS Part 1 Physics English Medium Chapter 5 Online Short Questions Test with Answers

Question # 1

Why Einstein views of gravitation are preferred than Newton's views of gravitation? Explain briefly

Ans 1: Newton discovered the inverse square law of gravity. Einstein's theory also says that gravity follows an inverse square law (except in strong gravitational fields), but it gives us a physical picture of how gravity works. The bending of star light caused by the gravity of the Sun was measured during a solar eclipse in 1919, it was found to match Einstein's Prediction rather than Newton's.

Question # 2

Explain the difference between tangential velocity and angular velocity.

Ans 1: The linear velocity of a particle moving along a curve or circle is called tangential velocity. Its direction is always along the tangent to the circle.
The rate of change of angular displacement is called angular velocity.The direction of angular velocity is along the axis of rotation of the body by right hand rule. V= rw

Question # 3

What is meant by moment of inertia? Explain its significance.

Ans 1: The product of mass of the particle and square of its perpendicular distance from the axis of rotation is called the moment of inertia.

I =mr²
^{The moment of inertia plays the same role in angular motion as the mass in linear motion.}

Question # 4

Define Moment of Inertia.Write its formula.

Ans 1: The property of the body to resist any change in its state of rest or uniform angular velocity is called moment of inertia. For a point mass 'm'situated at a distance 'r' from the axis of rotation , the moment of inertia 'I' is given by ; I=mr²
Significance;
Moment of inertia plays the same role in angular motion as that of mass plays in linear motion. It is also called measure of rotational inertia in angular motion.Moment of inertia determines the angular acceleration while mass determines the linear acceleration.

Question # 5

Define angular velocity, How its direction is determined?

Ans 1: The rate of change of angular displacement is called angular velocity. The direction of angular velocity is along the axis of rotation and can be determined by right hand rule:
"Grasp the axis of rotation in right hand with the figures curling in the direction of rotation then the erect thumb will give the direction of angular velocity."

Question # 6

Why banked tracks are needed for turns?

Ans 1: Banked tracks are needed because friction alone cannot provide energy for centripetal force.
If the road is banked, so that the outer edge is above the inner edge, then a portion of the normal force from the road on the tyre points towards the center of the track; this fraction of the normal force can provide enough centripetal force to keep the car moving in a circle.

Question # 7

Write down application of communication satellites.

Ans 1: A satellite communication system consist of three geo-stationary satellites.There are over 200 Earth stations which can transmit and receive signals.INTELSAT-VI operates at microwave frequencies 4, 4, 11 and 14 Ghz and has a capacity of 30,000 two way telephone circuits plus three TV channels.
Geo-stationary satellite are very useful for worldwide communication,weather observation, navigation, and other military uses.

Question # 8

How would you determine the direction of angular momentum?

Ans 1: The direction of angular momentum can be determined by right hand rule:
"Grasp the axis of rotation in right hand with the figures curling in the direction rotation then the erect thumb will give the direction of angular momentum."

Question # 9

What are geostationary orbit and geostationary satellites?

Ans 1: Geostationary Orbit: An orbit in which the time period of satellite is equal to the time period of spin motion of the earth is called geostationary orbit.

Geostationary Satellites: A satellite whose orbital motion is stationary along the earth is called geostationary satellite.

Question # 10

Why you wear seat belts?

Ans 1: During collision, the passengers move forward towards the windscreen due to inertia. The seat belt prevents the passenger from moving forward. And lessened the chances of injury.

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ICS Part 1 Physics English Medium Chapter 5 Online Short Questions Test with Answers

Online Short Questions For Chapter 5 "ICS Part 1 Physics Chapter 5 Short Questions Test "

Physics - ICS Part 1 Physics Chapter 5 Short Questions Test

Why Einstein views of gravitation are preferred than Newton's views of gravitation? Explain briefly

Explain the difference between tangential velocity and angular velocity.

What is meant by moment of inertia? Explain its significance.

Define Moment of Inertia.Write its formula.

Define angular velocity, How its direction is determined?

Why banked tracks are needed for turns?

Write down application of communication satellites.

How would you determine the direction of angular momentum?

What are geostationary orbit and geostationary satellites?

Why you wear seat belts?

Prepare Complete Set Wise Questions For Chapter 5 "ICS Part 1 Physics Chapter 5 Short Questions Test "

Set 1

Set 2

Set 3

ICS Part 1 Physics Chapter 5 Short Questions Test - Set 1

Why Einstein views of gravitation are preferred than Newton's views of gravitation? Explain briefly

Explain the difference between tangential velocity and angular velocity.

What is meant by moment of inertia? Explain its significance.

Define Moment of Inertia.Write its formula.

Define angular velocity, How its direction is determined?

Why banked tracks are needed for turns?

Write down application of communication satellites.

How would you determine the direction of angular momentum?

What are geostationary orbit and geostationary satellites?

Why you wear seat belts?

ICS Part 1 Physics Chapter 5 Short Questions Test - Set 2

What are Artificial Satellites?

On what factors moment of inertia depends?

Define angular displacement.

Define angular momentum and give its dimension.

How is artificial gravity created?

Explain conservation of direction of angular momentum.

Why the microwaves are used in satellite communication?

Why banked tracks are needed for turns?

Explain how many minimum number of Geo-stationary satellites are required for global coverage of T.V transmission.

Define angular velocity give its units and dimensions.

ICS Part 1 Physics Chapter 5 Short Questions Test - Set 3

Define centripetal force; write its formula and unit.

State the law of conversation of angular momentum.

Explain how many minimum number of Geo-stationary satellites are required for global coverage of T.V transmission.

Explain why earth's satellite despite of being freely falling object does not reach the earth.

An object orbiting around the earth in said to be a freely falling body. Why?

What is meant by centripetal force?Write down its formula

Why Einstein views of gravitation are preferred than Newton's views of gravitation? Explain briefly

Define angular displacement.

What are geostationary orbit and geostationary satellites?

On what factors moment of inertia depends?

ICS Part 1 Physics Short Questions Test

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