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Work and Energy

Description: This test is standardised achievment test in physics suitable for the students of cbse,icse and all other boards of class 6 and also useful for the students of different competitions and olympiads.
Number of Questions: 16
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Tags: Types of work and energy Work and Energy Physics Energy Change in State and Effect of Temperature and Pressure Different States of Matter
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Which of the following words defines the force of attraction between any two objects?

  1. Weight

  2. Gravity

  3. Thrust

  4. Friction

  5. Work


Correct Option: B
Explanation:

Gravitation force or gravity is the mutual force of attraction between two bodies because of their masses.

The SI unit of work and energy is named after the scientist _____.

  1. J P Joule

  2. Isaac Newton

  3. Michel Faradey

  4. James Watt

  5. Blaise Pascal


Correct Option: A
Explanation:

Joule is the SI unit of work and energy, which is named after J P Joule.

In which of the following forms is the energy stored in a cell?

  1. Heat energy

  2. Light energy

  3. Nuclear energy

  4. Muscular energy

  5. Chemical energy


Correct Option: E
Explanation:

In a cell energy is stored in the form of chemical energy because cell consists of some chemicals, when these chemicals reacted then energy is released.

Potential energy depends upon its

  1. colour

  2. motion

  3. size

  4. shape

  5. mass


Correct Option: E
Explanation:

Potential energy depends upon mass because Potential energy calculated by P.E=mgh, where m is mass of the body.

A kite when flying in the air has _____________.

  1. kinetic energy

  2. potential energy

  3. both potential energy and kinetic energy

  4. neither kinetic energy nor potential energy

  5. kinetic and muscular energy


Correct Option: A
Explanation:

A kite when flying in the air possesses only kinetic energy.

In a freely falling body, the interchange of energy takes place __________________.

  1. gradually from potential to kinetic energy

  2. gradually from kinetic to potential energy

  3. alternately between potential and kinetic

  4. gradually from chemical to kinetic energy

  5. gradually from potential to chemical energy


Correct Option: A
Explanation:

In a freely falling body, the interchange of energy takes place gradually from potential to kinetic energy.

In a diesel engine, which of the following energies is converted into mechanical energy?

  1. Sound energy

  2. Nuclear energy

  3. Chemical energy

  4. Electrical energy

  5. Light energy


Correct Option: C
Explanation:

 In Diesel engine,  while in motion  the chemical energy of diesel changes into mechanical energy.

The energy possessed by a moving body is called

  1. muscular energy

  2. kinetic energy

  3. heat energy

  4. potential energy

  5. light energy


Correct Option: B
Explanation:

The energy possessed by a moving body is called as kinetic energy.

Which of the following is not a fossil fuel?

  1. Kerosene

  2. Wood

  3. Coal

  4. Bio gas

  5. Natural gas


Correct Option: D
Explanation:

Bio gas is not a fossil fuel, it is formed by bio mass.

Which energy is produced by the vibrations of bodies?

  1. Wind

  2. Sound

  3. Electrical

  4. Light

  5. Heat


Correct Option: B
Explanation:

A vibrating body possesses sound energy, which is sensed by our ears.

Which type of energy conversion takes place in a hydroelectric power plant?

  1. Chemical energy into electrical energy

  2. Chemical energy into mechanical energy

  3. Mechanical energy into electrical energy

  4. Electrical energy into mechanical energy

  5. Light energy into electrical energy


Correct Option: C
Explanation:

Water of the hydroelectric power plant has mechanical energy, which is transformed into the electrical energy.

Which of the following statements is not true about the solar and wind energy?

  1. Both are the mechanical forms of energy.

  2. Both forms of energy can be classified as energy in action.

  3. Both types of energy sources cause no pollution.

  4. Both are the forms of renewable energy.

  5. Both types of energy can be converted into electrical energy.


Correct Option: A
Explanation:

No, solar energy is a form of heat energy while wind energy is a form of mechanical energy.

Which of the following has the highest potential energy?

  1. 10 kg stone at a height at 20 m

  2. 50 kg stone at a height at 2 m

  3. 40 kg stone at a height of 5 m

  4. 30 kg stone at a height of 7 m

  5. 20 kg stone at a height of 8 m


Correct Option: D
Explanation:

This has highest potential energy. P.E= mgh, where m=30 kg, h= 7 m, g=gravitational force, hence so P.E. = 30 * 7 = 210 joule

Which of the following energies is not a form of stored energy?

  1. Chemical energy

  2. Muscular energy

  3. Magnetic energy

  4. Nuclear energy

  5. Electrical energy


Correct Option: E
Explanation:

Electrical energy can not be stored, it is a form of energy in action, because it is produced by moving electrons .

A plant usually stores its carbohydrates in its fruits. This process shows the conversion of ___________.

  1. kinetic energy to potential energy

  2. mechanical energy to chemical energy

  3. solar energy to chemical energy

  4. chemical energy to mechanical energy

  5. chemical energy to solar energy


Correct Option: C
Explanation:

Green plants absorb sun light during photosynthesis and prepare their own food, in this way plants convert this solar energy in chemical energy.

A chemical, when burned, produces energy if

  1. the energy absorbed by reactants is more than the energy released by products

  2. the energy absorbed by reactants is less than the energy released by products

  3. the energy released by products is equal to energy absorbed by reactants

  4. it reacts with carbon dioxide

  5. none of these


Correct Option: B
Explanation:

Yes, when the energy absorbed by reactants is less than energy released by products.

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