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Physics XI Notes

Physics XI Notes

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Dispersion- Old is Gold

Dispersion- Old is Gold

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1 min read
Why bridges are declared unsafe after a long use?

Why bridges are declared unsafe after a long use?

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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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1 min read
Why is a horse more stable than a man?

Why is a horse more stable than a man?

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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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Lenses – Old is Gold

Lenses – Old is Gold

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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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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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1 min read
Is friction a necessary evil? Explain.

Is friction a necessary evil? Explain.

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1 min read
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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1 min read
How does K.E. of an object change if its momentum is doubled?

How does K.E. of an object change if its momentum is doubled?

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Why is Glycerine more viscous than water?

Why is Glycerine more viscous than water?

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1 min read
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.

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1 min read
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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why do we slip on a rainy day?

why do we slip on a rainy day?

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Work

Work

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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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1 min read
In a siphon, water is lifted above its level during flow from container to another, where does it needed potential energy from?

In a siphon, water is lifted above its level during flow from container to another, where does it needed potential energy from?

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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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Explain why the moon has no atmosphere?

Explain why the moon has no atmosphere?

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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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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?

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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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1 min read
Why is the bottom of a ship made heavy?

Why is the bottom of a ship made heavy?

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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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Reflection at curved mirrors- Old is Gold

Reflection at curved mirrors- Old is Gold

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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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Electrostatics- Old is Gold

Electrostatics- Old is Gold

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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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Refraction at plane surfaces- Old is Gold

Refraction at plane surfaces- Old is Gold

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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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Distinguish between conservative and non-conservative force.

Distinguish between conservative and non-conservative force.

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

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

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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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Thermal Properties of Matter- Old is Gold

Thermal Properties of Matter- Old is Gold

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What is meant by elastic and inelastic collision?

What is meant by elastic and inelastic collision?

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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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Hygrometry- Old is Gold

Hygrometry- Old is Gold

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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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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?

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What do you understand by viscosity?

What do you understand by viscosity?

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Kinematics-Old is Gold

Kinematics-Old is Gold

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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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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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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?

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Units in different systems

Units in different systems

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3 min read
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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Explain how Newton’s first law of motion follows from the second law.

Explain how Newton’s first law of motion follows from the second law.

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Second Law of Thermodynamics- Old is Gold

Second Law of Thermodynamics- Old is Gold

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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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Why does ice float in water?

Why does ice float in water?

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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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Why is the kinetic friction less than the limiting friction?

Why is the kinetic friction less than the limiting friction?

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Viscosity-Old is Gold

Viscosity-Old is Gold

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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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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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1. State Newton’s Second Law of Motion.

1. State Newton’s Second Law of Motion.

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What are the drawbacks of simple pendulum?

What are the drawbacks of simple pendulum?

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Quantity of Heat- Old is Gold

Quantity of Heat- Old is Gold

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1 min read
Physics XI Questions

Physics XI Questions

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10 min read
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