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Q1. A car is accelerated on a leveled road and attains a velocity 4 times of its initial velocity. In this process, the kinetic energy of the car

(a) Becomes twice to that of the initial
(b) Becomes four times to that of the initial
(c) Remains the same
(d) Becomes 16 times to that of the initial

Q2. When a body like earth is moving in a circular path the work done in that case is zero because:

(a) Centripetal force acts in the direction of motion of the body
(b) Centripetal force acts along the radius of circular path
(c) Gravitational force acts along the radius of circular path
(d) Centrifugal force acts perpendicular to the radius of circular path

Q3. When a body falls freely towards the earth, then its total energy

(a) Decreases
(b) Increases
(c) First increases and then decreases
(d) Remains constant

Q4. A man is carrying the heavy luggage from one platform to the other of a Railway station but still according to the logics of science his work done is said to be zero. Can you opt out the correct reason?

(a) The force is acting along the direction of displacement of luggage
(b) The force is acting perpendicular to the direction of displacement of luggage
(c) The force is acting opposite to the direction of displacement of luggage
(d) None of these

Q5. A bullet fired from a gun can pierce a target due to its ___________

(a) Mechanical energy
(b) Heat energy
(c) Kinetic energy
(d) Acceleration

Q6. A person is holding a bucket by applying a force of 10N. He moves a horizontal distance of 5m and then climbs up a vertical distance of 10m. Find the total work done by him?

(a) 877J
(b) 658J
(c) 100J
(d) 647J

Q7. A gardener pushes a lawn roller through a distance of 20m. If he applies a force of 20kg weight in a direction inclined at 60° to the ground, find the work done by him. (g=9.8m/s2)

(a) 4584J
(b) 1960J
(c) 7543J
(d) 8537J

Q8. For a body moving in a circular path, the work done by the centripetal force is ___________

(a) Negative
(b) Positive
(c) Constant
(d) Zero

Q9. When a body slides against a rough horizontal surface, the work done by friction is ___________

(a) Positive
(b) Zero
(c) Negative
(d) Constant

Q10. When a body falls freely under gravity, then the work done by the gravity is ___________

(a) Positive
(b) Negative
(c) Zero
(d) Infinity


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1 Answer
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A Block Of Mass 5kg Is Resting On A Smooth Surface. At What Angle A Force Of 20N Be Acted On The Body So That It Will Acquired A Kinetic Energy Of 40J After Moving 4m.

Modified 234 Year Ago

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234 Year Ago

A Block Of Mass 5kg Is Resting On A Smooth Surface. At What Angle A Force Of 20N Be Acted On The Body So That It Will Acquired A Kinetic Energy Of 40J After Moving 4m.

0 votes
1 Answer
717 views

A Mass Of M Kg Is Suspended By A Weightless String. The Horizontal Force That Is Required To Displace It Until The String Makes An Angle Of 45° With The Initial Vertical Direction Is

Modified 17 Year Ago

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17 Year Ago

A Mass Of M Kg Is Suspended By A Weightless String. The Horizontal Force That Is Required To Displace It Until The String Makes An Angle Of 45° With The Initial Vertical Direction Is

0 votes
1 Answer
678 views

A Ball Is Dropped From Height 20 M. If Coefficient Of Restitution Is 0.9 What Will Be The Height Attained After First Bounce?

Modified 17 Year Ago

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678
17 Year Ago

A Ball Is Dropped From Height 20 M. If Coefficient Of Restitution Is 0.9 What Will Be The Height Attained After First Bounce?

0 votes
1 Answer
503 views

A 50kg Man With 20kg Load On His Head Climbs Up 20 Steps Of 0.25m Height Each

Modified 204 Year Ago

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204 Year Ago

A 50kg Man With 20kg Load On His Head Climbs Up 20 Steps Of 0.25m Height Each

0 votes
1 Answer
499 views

A Particle Of Mass 100g Thrown Vertically Upwards With A Speed Of 5m/s.

Modified 234 Year Ago

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234 Year Ago

A Particle Of Mass 100g Thrown Vertically Upwards With A Speed Of 5m/s.

0 votes
1 Answer
472 views

If Force And Displacement Of Particle In Direction Force Are Doubled.Work Would Be

Modified 234 Year Ago

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234 Year Ago

If Force And Displacement Of Particle In Direction Force Are Doubled.Work Would Be

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