Karma Physics test

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A mechanic is trying to loosen a tight bolt using a wrench. To make the task easier, he holds the wrench at its farthest end and applies force perpendicular to the handle. Why does this method help in loosening the bolt?

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A tightrope walker carries a long pole while walking on the rope. How does the pole help them maintain balance?

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A person pushes a shopping cart with a force of 50 N at an angle of 60° while waiting in line. The cart does not move. What is the work done by the applied force?

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While taking a sharp turn on a bike, a rider leans inward toward the curve. What is the reason for this action?

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Hydrogen-powered fuel cell vehicles generate electricity to run the motor by reacting hydrogen and oxygen. Which of the following best describes the energy conversion process?

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A company claims to have designed a perpetual motion machine that can run indefinitely without an external energy source while performing useful work. Why is this claim false?

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A crane lifts a 500 kg load vertically upwards by 20 m in 10 seconds at a constant speed. What is the power output of the crane? (Take g = 10 m/s²)

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A truck and a car are moving on a highway with the same momentum. However, the truck has more mass than the car. Which of the following statements is true about their kinetic energies?

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A car is moving with constant speed on a circular track. Which of the following statements is correct?

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A 40 kg child sits 2 m from the pivot of a seesaw. On the other side, at a distance of 3 m from the pivot, an adult sits to balance the seesaw. What should be the minimum mass of the adult to keep the seesaw in equilibrium?

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If the mass of an object is doubled, keeping the height same, its gravitational potential energy will:

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If an object moves with constant velocity, what can be said about the net work done on it?

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A shopkeeper turns a key in a lock to close the shutter. If the key is rotated clockwise, the moment of force is:

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A moving car has kinetic energy. What happens to this energy when the car stops due to brakes?

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Two workers push identical carts with the same force for the same distance. Worker X does it in 5 seconds, and Worker Y does it in 10 seconds. Which statement is correct?

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How many joules are there in 2 kilowatt hour (kWh)?

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Which of the following objects can have a center of gravity outside its physical material?

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Assertion (A): Energy can be transferred from one form to another.
Reason (R): Energy is always conserved, and it cannot be created or destroyed.

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A parachutist descending at a constant velocity experiences:

1

A mechanic is trying to loosen a tight bolt using a wrench. To make the task easier, he holds the wrench at its farthest end and applies force perpendicular to the handle. Why does this method help in loosening the bolt?

A tightrope walker carries a long pole while walking on the rope. How does the pole help them maintain balance?

A person pushes a shopping cart with a force of 50 N at an angle of 60° while waiting in line. The cart does not move. What is the work done by the applied force?

While taking a sharp turn on a bike, a rider leans inward toward the curve. What is the reason for this action?

Hydrogen-powered fuel cell vehicles generate electricity to run the motor by reacting hydrogen and oxygen. Which of the following best describes the energy conversion process?

A company claims to have designed a perpetual motion machine that can run indefinitely without an external energy source while performing useful work. Why is this claim false?

A crane lifts a 500 kg load vertically upwards by 20 m in 10 seconds at a constant speed. What is the power output of the crane? (Take g = 10 m/s²)

A truck and a car are moving on a highway with the same momentum. However, the truck has more mass than the car. Which of the following statements is true about their kinetic energies?

A car is moving with constant speed on a circular track. Which of the following statements is correct?

A 40 kg child sits 2 m from the pivot of a seesaw. On the other side, at a distance of 3 m from the pivot, an adult sits to balance the seesaw. What should be the minimum mass of the adult to keep the seesaw in equilibrium?

If the mass of an object is doubled, keeping the height same, its gravitational potential energy will:

If an object moves with constant velocity, what can be said about the net work done on it?

A shopkeeper turns a key in a lock to close the shutter. If the key is rotated clockwise, the moment of force is:

A moving car has kinetic energy. What happens to this energy when the car stops due to brakes?

Two workers push identical carts with the same force for the same distance. Worker X does it in 5 seconds, and Worker Y does it in 10 seconds. Which statement is correct?

How many joules are there in 2 kilowatt hour (kWh)?

Which of the following objects can have a center of gravity outside its physical material?

Assertion (A): Energy can be transferred from one form to another.Reason (R): Energy is always conserved, and it cannot be created or destroyed.

A parachutist descending at a constant velocity experiences:

Which of these tools works based on the principle of a couple?

Assertion (A): Energy can be transferred from one form to another.
Reason (R): Energy is always conserved, and it cannot be created or destroyed.