Work, Energy and Power (STUDY BY TOPICS JUNIOR CLASS) : GATE Academy

Welcome to your Work, Energy and Power (STUDY BY TOPICS JUNIOR CLASS)

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[ Junior school science (physics) ]

A person jumps to the ground from a platform 10 feet high. Which of the following is true?

The person has more kinetic energy before they jump than after they jump.

The person's kinetic energy at the instant they jump is approximately double their potential energy the instant they land.

The person's potential energy at the instant they jump is approximately equal to their kinetic energy the instant they land.

The person has less potential energy at the top of the platform than in the air.

[ Junior school science (physics) ]

Which of the following are NOT types of energy

Light

Sound

Wood

Electricity

[ Junior school science (physics) ]

The formula of potential energy is

fscost

scos t

mgh

[ Junior school science (physics) ]

A feather and a coin are dropped in the air. Each falls with equal _____.

Momenta

None of the above

Potential energy

Kinetic energies

[ Junior school science (physics) ]

A feather and a coin dropped in a vacuum fall with equal ____

Momenta

Forces

Kinetic energies

Accelerations

[ Junior school science (physics) ]

A material through which electric current CANNOT pass easily is a/an ____________

Conductor

Receptor

Tester

Insulator

[ Junior school science (physics) ]

The kinetic energy of an object will increase the most if you _______

Double the potential energy

Double the temperature of the object

Double the velocity of the object

Double the mass of the object

[ Junior school science (physics) ]

Electric current in a/an ____________________ circuit travels in MORE THAN ONE path.

Series

Connected

Parallel

Wire

[ Junior school science (physics) ]

In order for a circuit to work, the path must be _________.

Open

Paralled

Series

Closed

10.

[ Junior school science (physics) ]

The SI unit of time is

days

hours

seconds

minutes

11.

[ Junior school science (physics) ]

Which of the following is not a unit for power?

Watt

Horsepower

Joule – second

Newton-meter per second

12.

[ Junior school science (physics) ]

When an object is lifted 10 meters, it gains a certain amount of potential energy. If the same object is lifted 20 meters, its potential energy is ______.

Twice as much.

Less.

Four times as much

The same

13.

[ Junior school science (physics) ]

The following are natural sources of energy except

Food

Sun

Petroleum

Wind

14.

[ Junior school science (physics) ]

"Power" is defined as ________

The rate at which work is done

The velocity of an object squared

The sum of potential and kinetic energy

The energy necessary to do work

15.

[ Junior school science (physics) ]

What work is done when a mass of 5kg is raised through a vertical height of 25m (take g=10m/s²)

1250J

12500J

125J

12.5J

16.

[ Junior school science (physics) ]

Example of renewable energy include the following except

Natural Gas

Sun

Water

Wind

17.

[ Junior school science (physics) ]

Calculate the work done in moving a body through a distance of 20m pulled along a horizontal plane by a force of 10N applied to the plane

200J

400J

100J

300J

18.

[ Junior school science (physics) ]

The potential energy of an object is equal to _______

The velocity of the object divided by its mass.

The force of gravity working on the object.

The size of the object compared to its surface area.

The work done on the object to put the object into its current state.

19.

[ Junior school science (physics) ]

Two identical arrows, one with twice the speed of the other, are fired into a hay bale. The faster arrow will penetrate _____.

Four times as far as the slower arrow.

More than four times as far as the slower arrow.

Twice as far as the slower arrow.

The same distance as the slower arrow.

20.

[ Junior school science (physics) ]

There are how many types of force

21 out of 20

Work, Energy and Power (STUDY BY TOPICS JUNIOR CLASS)

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