CURIOUSITY QUIZ: WORK, POWER, ENERGY

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Test Your knowledge on 'Work, Power, Energy' prepared exclusively according to the NCERT science curriculum for Class-9 . Attempt all the questions by clicking on the right option. Submit the completed Form by clicking the 'Submit' button at the end of the Form. Get your Score and the correct Answer by clicking the 'View score' button. Good Luck!

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Which physical quantity has the same unit as that of Energy ?

1 point

Power

Torque

Pressure

Work

Clear selection

He first experimentally verified the Law of Conservation of Energy and calculated a value for the Mechanical Equivalent of Heat. Who was he ?

1 point

Sadi Carnot

James Prescott Joule

Count Rumford

Lord Kelvin

Clear selection

The SI unit of Work is Newton. meter (N.m). What is its other name ?

1 point

Erg

Pascal

Watt

Joule

Clear selection

What is the Work done by the Force of Gravity on a satellite moving around the Earth ?

1 point

It depends on the value of 'g' at the orbit of the satellite .

It depends on the Mass of the satellite orbiting around the Earth..

It depends on the height of the satellite from the Earth's surface.

Clear selection

Work done by Friction on a moving body is:

1 point

Zero

Always Positive

Negative

Can't be said.

Clear selection

The unit of electrical energy generally used in households and commercial establishments to measure the consumption of energy is expressed in :

1 point

Joules

KwH

Horse Power

Kilo Watt

Clear selection

The Power of an Engine is generally measured in a unit called Horse Power (hp). How many Watts make a Mechanical Horse Power ?

1 point

681

745.7

1001

398

Clear selection

When the Work done by a given Force can be zero?

1 point

When the Displacement produced by the Force is zero.

When the Displacement is produced perpendicular to the direction of the Force.

Both the above answers are correct.

When the Displacement is produced parallel to the direction of the Force.

Clear selection

Power is defined as the rate of doing Work. The SI unit of Power is Watt (W). 1 W = ?

1 point

1 J/min

1 kW/h

1 J/h

1 J/s

Clear selection

A battery lights a bulb. Describe the energy changes involved in the process.

0 points

Electrical energy is converted to Chemical energy.

Electrical energy is converted to Heat energy.

Chemical energy is converted to Electrical energy which is then converted to Light energy.

Electrical energy is converted to Light energy.

Clear selection

An object of mass 'm' is moving with a constant velocity 'v'. How much Work should be done on the object in order to bring it to rest?

1 point

1/2 mv2

Zero

mgh

Clear selection

A stone is dropped from the top of a building. What is the kind of energy of the body :

Just before its release?

During its fall in air?

When it is about to touch the ground?

1 point

Fully Potential; Fully Kinetic; Partly Kinetic and partly Potential

Fully Potential; Fully Kinetic; Fully Kinetic

Fully Kinetic; Partly Potential and partly Kinetic; Fully Potential

Fully Potential; Partly Potential and partly Kinetic; Fully Kinetic

Clear selection

A metal spring is first compressed and then completely dissolved in an acid solution. What happens to its stored elastic potential energy?

1 point

The energy got lost as the spring is eaten away by the acid

The energy appears in the form of the chemical energy of the acid.

The energy gets stored in the molecular energy of the acid molecules.

The stored energy of the metal atoms of the spring increases Kinetic energy of the acid molecules which, in turn, is manifested in the form of heat energy that slightly increases the temperature of the solution.

Clear selection

How many Joules make 1 kWh ?

1 point

3,60,000 (3.6 x 10 5) Joules

3,600,000 (3.6 x 10 6) Joules

36,000 (3.6 x 10 4) Joules

3600 (3.6 x 10 3) Joules

Clear selection

What is TRUE about a body that falls through certain distance from a height ?

1 point

The Work done by gravity on the body is equal to the gain in Kinetic Energy by the body.

The body losses Potential Energy which is manifested by the gain in Kinetic Energy .

The Work done by gravity on the is independent of the path followed by the body as long as its initial and final points remain the same.

All the above answers are true.

Clear selection

An object is dropped from rest from the top of a building of 10m height. Neglecting air resistance, what is the speed of the object on reaching the ground ?

1 point

12 m/sec

13 m/sec

14 m/sec

Can't be said.

Clear selection

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