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Physics XI Notes

Physics XI Notes

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Optical instruments- Old is Gold

Optical instruments- Old is Gold

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1 min read
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?

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1 min read
A pendulum clock is taken to moon. Will it gain or lose time?

A pendulum clock is taken to moon. Will it gain or lose time?

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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.

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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.

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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?

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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?

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A helium filled balloon rises to a certain height and then halts. Why?

A helium filled balloon rises to a certain height and then halts. Why?

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Why does ice float in water?

Why does ice float in water?

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Surface Tension-Old is Gold

Surface Tension-Old is Gold

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What do you understand by viscosity?

What do you understand by viscosity?

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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?

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A rigid, lighter than air balloon filled with Helium cannot continue to rise indefinitely. Why?

A rigid, lighter than air balloon filled with Helium cannot continue to rise indefinitely. Why?

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First law of thermodynamics- Old is Gold

First law of thermodynamics- Old is Gold

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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?

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If a moving bullet striking a block of wood on a frictionless table embeds inside it what happens to the KE of the bullet?

If a moving bullet striking a block of wood on a frictionless table embeds inside it what happens to the KE of the bullet?

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Hygrometry- Old is Gold

Hygrometry- Old is Gold

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why do we slip on a rainy day?

why do we slip on a rainy day?

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A cork is floating in water. What is the apparent weight of the cork?

A cork is floating in water. What is the apparent weight of the cork?

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A solid tied at the end of a string is revolved in vertical. At what point the tension in the string will be the greatest?

A solid tied at the end of a string is revolved in vertical. At what point the tension in the string will be the greatest?

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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?

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

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

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Why is a cow more stable than a man?

Why is a cow more stable than a man?

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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?

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Explain which one is more elastic- rubber or steel.

Explain which one is more elastic- rubber or steel.

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Work

Work

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Heat and Temperature- Old is Gold

Heat and Temperature- Old is Gold

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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.

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Lenses – Old is Gold

Lenses – Old is Gold

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Units in different systems

Units in different systems

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3 min read
NEB Model Question for Physics – Class 11

NEB Model Question for Physics – Class 11

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4 min read
Electrostatics- Old is Gold

Electrostatics- Old is Gold

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If the earth is struck by meteorites, the earth will slow down slightly. Why?

If the earth is struck by meteorites, the earth will slow down slightly. Why?

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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?

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What is the counterpart of the mass and force in rotational motion?

What is the counterpart of the mass and force in rotational motion?

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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?

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What is meant by elastic and inelastic collision?

What is meant by elastic and inelastic collision?

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When a heavy truck collides with a car, the occupants of car are more likely to be hurt than the truck driver. Why?

When a heavy truck collides with a car, the occupants of car are more likely to be hurt than the truck driver. Why?

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Why an astronaut in a space capsule orbiting the earth experiences a feeling of weightlessness?

Why an astronaut in a space capsule orbiting the earth experiences a feeling of weightlessness?

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

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

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Explain why a coin placed on a cardboard covering a glass falls into the glass when the cardboard is pulled to one side?

Explain why a coin placed on a cardboard covering a glass falls into the glass when the cardboard is pulled to one side?

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Why is it difficult to run fast on sand?

Why is it difficult to run fast on sand?

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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?

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How will you justify that stone is more rigid than iron?

How will you justify that stone is more rigid than iron?

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Is friction a necessary evil? Explain.

Is friction a necessary evil? Explain.

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Why is the bottom of a ship made heavy?

Why is the bottom of a ship made heavy?

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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?

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What is meant by the moment of a couple?

What is meant by the moment of a couple?

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Reflection at curved mirrors- Old is Gold

Reflection at curved mirrors- Old is Gold

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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?

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Refraction at plane surfaces- Old is Gold

Refraction at plane surfaces- Old is Gold

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Thermal Properties of Matter- Old is Gold

Thermal Properties of Matter- Old is Gold

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Why is Glycerine more viscous than water?

Why is Glycerine more viscous than water?

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Kinematics-Old is Gold

Kinematics-Old is Gold

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Why bridges are declared unsafe after a long use?

Why bridges are declared unsafe after a long use?

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Photometry- Old is Gold

Photometry- Old is Gold

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Refraction through prisms- Old is Gold

Refraction through prisms- Old is Gold

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

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

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Is it possible for a solid body to have no matter at it centre of gravity?

Is it possible for a solid body to have no matter at it centre of gravity?

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Explain why the moon has no atmosphere?

Explain why the moon has no atmosphere?

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