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Physics XI Notes

Physics XI Notes

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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 bridges are declared unsafe after a long use?

Why bridges are declared unsafe after a long use?

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

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

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What do you understand by viscosity?

What do you understand by viscosity?

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Reflection at curved mirrors- Old is Gold

Reflection at curved mirrors- Old is Gold

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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 do you mean by geo-stationary satellite? Explain?

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

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Units in different systems

Units in different systems

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3 min read
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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Electrostatics- Old is Gold

Electrostatics- Old is Gold

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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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Hygrometry- Old is Gold

Hygrometry- Old is Gold

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Dispersion- Old is Gold

Dispersion- Old is Gold

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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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Photometry- Old is Gold

Photometry- 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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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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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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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 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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What are the drawbacks of simple pendulum?

What are the drawbacks of simple pendulum?

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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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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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What are centre of buoyancy and metacentre?

What are centre of buoyancy and metacentre?

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Viscosity-Old is Gold

Viscosity-Old is Gold

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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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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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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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Lenses – Old is Gold

Lenses – Old is Gold

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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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State the laws of flotation.

State the laws of flotation.

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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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Why is a cow more stable than a man?

Why is a cow more stable than a man?

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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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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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Why is it difficult to run fast on sand?

Why is it difficult to run fast on sand?

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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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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 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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Physics XI Questions

Physics XI Questions

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10 min read
Why is Glycerine more viscous than water?

Why is Glycerine more viscous than water?

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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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Why does ice float in water?

Why does ice float in water?

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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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Optical instruments- Old is Gold

Optical instruments- Old is Gold

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Is friction a necessary evil? Explain.

Is friction a necessary evil? Explain.

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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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Surface Tension-Old is Gold

Surface Tension-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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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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What is meant by elastic and inelastic collision?

What is meant by elastic and inelastic collision?

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Transfer of heat- Old is Gold

Transfer of heat- Old is Gold

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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?

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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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Explain why spokes are fitted in the cycle wheel.

Explain why spokes are fitted in the cycle wheel.

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Explain why a cyclist bend while going along curved road?

Explain why a cyclist bend while going along curved road?

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Thermal Properties of Matter- Old is Gold

Thermal Properties of Matter- Old is Gold

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Steel balls sink in water but they don’t sink in mercury. Why?

Steel balls sink in water but they don’t sink in mercury. Why?

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1 min read
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