WORK, POWER AND ENERGY.

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

• (a) increases

• (b) decreases

• (c) remains constant

• (d) first increases and then decreases

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car

• DOES NOT CHANGE

• BECOMES TWICE TO THAT OF INITIAL

• BECOME 4 TIMES THAT OF INITIAL

• BECOMES 16 TIMES

In case of negative work the angle between the force and displacement is

• 0

• 45

• 90

• 180

An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are lo m above the ground, they have the same.

• ACCELERATION

• MOMENTA

• POTENTIAL ENERGY

• KINETIC ENERGY

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-4

A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)

• 6X10*3 J

• 6 J

• 0.6 J

• 0

Which one of the following is not the unit of energy?

• JOULE

• NEWTON METRE

• KILOWATT

• KILOWATT HOUR

The work done on an object does not depend upon the

• displacement

• force applied

• angle between force and displacement

• initial velocity of the object

Water stored in a dam possesses

• NO ENERGY

• ELECTRICAL ENERGY

• KINETIC ENERGY

• POTENTIAL ENERGY

Tags

NGSS.MS-PS3-2

A body is falling from a height h. After it has fallen a height h/2, it will possess

• only potential energy

• only kinetic energy

• half potential and half kinetic energy

• more kinetic and less potential energy

Tags

NGSS.MS-PS3-4

NGSS.MS-PS3-5

If speed of a car becomes 2 times, its kinetic energy becomes

• 4TIMES

• 8 TIMES

• 16 TIMES

• 12TIMES