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# Physics XI Notes

Physics XI Notes

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Can a body be in equilibrium if it is in motion? Explain.

## Can a body be in equilibrium if it is in motion? Explain.

On what factors does the time period of a simple pendulum depend?

## On what factors does the time period of a simple pendulum depend?

Viscosity-Old is Gold

## Viscosity-Old is Gold

What will happen to the value of ‘g’ if the earth stops rotating?

## What will happen to the value of ‘g’ if the earth stops rotating?

Differentiate between conservation of kinetic energy and conservation of linear momentum.

## Differentiate between conservation of kinetic energy and conservation of linear momentum.

3. Explain why a cricketer moves his hands backwards while catching ball?

## 3. Explain why a cricketer moves his hands backwards while catching ball?

State the laws of flotation.

## State the laws of flotation.

Why a wrench of longer arm is preferred in comparison to a wrench of short arm?

## Why a wrench of longer arm is preferred in comparison to a wrench of short arm?

Why is Glycerine more viscous than water?

## Why is Glycerine more viscous than water?

Why is a cow more stable than a man?

## Why is a cow more stable than a man?

why do we slip on a rainy day?

## why do we slip on a rainy day?

A body is moving in a circular path with constant speed. Is this motion a simple harmonic?

## A body is moving in a circular path with constant speed. Is this motion a simple harmonic?

If a pendulum clock is taken to a mountain top, does it gain or lose time?

## If a pendulum clock is taken to a mountain top, does it gain or lose time?

The earth moving round the sun actes upon by a force, the work on earth by this force. Do you agree with this statement?

## The earth moving round the sun actes upon by a force, the work on earth by this force. Do you agree with this statement?

1. State Newton’s Second Law of Motion.

## 1. State Newton’s Second Law of Motion.

2. If action and reaction are always equal and opposite, why don’t they always cancel each other?

## 2. If action and reaction are always equal and opposite, why don’t they always cancel each other?

Hygrometry- Old is Gold

## Hygrometry- Old is Gold

Why is it easy to pull a lawn roller than to push it?

## Why is it easy to pull a lawn roller than to push it?

Transfer of heat- Old is Gold

## Transfer of heat- Old is Gold

Photometry- Old is Gold

## Photometry- Old is Gold

What do you understand by viscosity?

## What do you understand by viscosity?

What is meant by the moment of a couple?

## What is meant by the moment of a couple?

Kinematics-Old is Gold

## Kinematics-Old is Gold

Can a body be regarded in a state of rest as well as in motion at the same time? Give an example.

## Can a body be regarded in a state of rest as well as in motion at the same time? Give an example.

Lenses – Old is Gold

## Lenses – Old is Gold

Refraction through prisms- Old is Gold

## Refraction through prisms- Old is Gold

Why is the bottom of a ship made heavy?

## Why is the bottom of a ship made heavy?

Why is it difficult to run fast on sand?

## Why is it difficult to run fast on sand?

During pregnancy, woman often develop back pains from leaning backward while walking. Why do they have to walk this way?

## During pregnancy, woman often develop back pains from leaning backward while walking. Why do they have to walk this way?

Units in different systems

## Units in different systems

If the sun somehow collapsed to form a black hole, what effect would this event have on the orbit of the earth?

## If the sun somehow collapsed to form a black hole, what effect would this event have on the orbit of the earth?

Physics XI Questions

## Physics XI Questions

If a cork is released from the bottom of a jar filled with water, what will happen and why?

## If a cork is released from the bottom of a jar filled with water, what will happen and why?

How does ‘g’ at a point vary with distance from the centre of the earth? Where is the highest value of ‘g’? Explain.

## How does ‘g’ at a point vary with distance from the centre of the earth? Where is the highest value of ‘g’? Explain.

NEB Model Question for Physics – Class 11

## NEB Model Question for Physics – Class 11

A dancer girl is rotating over a turntable with her arms outstretched. If she lowers her arms how does this affect her motion?

## A dancer girl is rotating over a turntable with her arms outstretched. If she lowers her arms how does this affect her motion?

What are centre of buoyancy and metacentre?

## What are centre of buoyancy and metacentre?

Dispersion- Old is Gold

## Dispersion- Old is Gold

Thermal Properties of Matter- Old is Gold

Work

## Work

The weight of a body is less inside the earth than on the surface. Explain.

## The weight of a body is less inside the earth than on the surface. Explain.

Is friction a necessary evil? Explain.

## Is friction a necessary evil? Explain.

Explain why the moon has no atmosphere?

## Explain why the moon has no atmosphere?

A man carrying a bucket of water on his hand always leans to the opposite side. Explain.

## A man carrying a bucket of water on his hand always leans to the opposite side. Explain.

What do you mean by geo-stationary satellite? Explain?

## What do you mean by geo-stationary satellite? Explain?

What is the difference between centre of gravity and centre of mass of a system?

## What is the difference between centre of gravity and centre of mass of a system?

Suppose two forces act on rigid body and two forces have same magnitude but opposite direction. what conditions the body rotate?

## Suppose two forces act on rigid body and two forces have same magnitude but opposite direction. what conditions the body rotate?

Quantity of Heat- Old is Gold

## Quantity of Heat- Old is Gold

When a bus takes a turn, passengers are thrown away from the centre of the curved path. Why?

## When a bus takes a turn, passengers are thrown away from the centre of the curved path. Why?

Why is easier to lift a body in a liquid than in air?

## Why is easier to lift a body in a liquid than in air?

How will you make difference between density and specific gravity of a body?

## How will you make difference between density and specific gravity of a body?

The leaves fall when a tree is shaken. Give reason.

## The leaves fall when a tree is shaken. Give reason.

Explain why a man carrying a load on his back leans forward?

## Explain why a man carrying a load on his back leans forward?

Refraction at plane surfaces- Old is Gold

## Refraction at plane surfaces- Old is Gold

What is meant by elastic and inelastic collision?

## What is meant by elastic and inelastic collision?

Why is the kinetic friction less than the limiting friction?

## Why is the kinetic friction less than the limiting friction?

Optical instruments- Old is Gold

## Optical instruments- Old is Gold

Explain why a cyclist bend while going along curved road?