Tag: physics

Questions Related to physics

A stretched spring possesses:

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. kinetic energy

  2. elastic potential energy

  3. electric energy

  4. magnetic energy

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Correct Option: B
Explanation:

Elastic potential energy is Potential energy stored as a result of deformation of an elastic object, such as the stretching of a spring. It is equal to the work done to stretch the spring, which depends upon the spring constant k as well as the distance stretched.

The energy required to raise a given volume of water from a well can be

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Mega watts

  2. Mega newton

  3. Mega joules

  4. Kilo watts

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Correct Option: C
Explanation:

unit of energy is joule.

so energy required for raising water from the well is also in joule or kilo joule or mega joule.
watt is unit of energy per unit time and  newton is unit of force.
so best option is option C.
Also 1 Mega joule $=10\times10^6$ joule.

A cricket ball of mass 300 g is bowled towards a batsman with a speed of $\displaystyle 180\quad km\quad { h }^{ -1 }$. The batsman hits the ball such that it bounces back with the same speed. If the force exerted by the bat on the ball is 3000 N, find the duration of the impact is ____ s.

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. 1

  2. 0.01

  3. 0.1

  4. 0.04

Show answer
Correct Option: B

The type of energy utilised by humans and animals to carry out their daily life activities is ________ .

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. wind energy

  2. geothermal energy

  3. biochemical energy

  4. hydro energy

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Correct Option: C
Explanation:
Biochemical energy comes under biochemistry which is a study of chemical processes within and relating to living organisms. By controlling information flow through biochemical signaling and flow of chemical energy through metabolism, biochemical processes involves in day to day activities.
Hence biochemical energy is utilised by humans for carrying daliy activities.

The energy stored in a torch cell is :

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Light energy

  2. Electrical energy

  3. Chemical energy

  4. Potential energy

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Correct Option: C
Explanation:

The torch cell makes use of redox reaction to store energy in the form of chemical energy. This chemical energy is then converted to electrical energy and finally to light energy as the bulb glows.


Hence, correct answer is option $C$

The energy that helps in burning of wood is :

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Chemical

  2. Electrical

  3. Potential

  4. Muscular

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Correct Option: A
Explanation:

In the case of burning wood, stored chemical energy in the log is released due to heating by other excited atoms. This chemical reaction is called combustion and requires oxygen. Combustion changes the chemical energy into heat and light energy.


Hence, correct answer is option $A$

An electric heater converts electrical energy into

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Chemical energy

  2. Heat energy

  3. Light energy

  4. Muscular energy

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Correct Option: B
Explanation:

An electric heater is an electrical device that converts electrical energy into heat energy. The heating elements inside electric heater is an electrical converter and works on the principle of joule heating. An electric current passing through resistor converts electrical energy into heat energy.

The energy present in petrol is :

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Chemical

  2. Kinetic

  3. Potential

  4. Heat

Show answer
Correct Option: A
Explanation:

 chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.

kinetic energy is due to motion.
potential energy is due to relative position.
heat energy is due to temperature.
in petrol different different reaction occurs which provide energy to run the engine, so energy possessed in petrol is chemical energy.
option A.

The muscular energy required by our body is given to us by :

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Air

  2. Water

  3. Oxygen

  4. Food

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Correct Option: D
Explanation:

chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.

In food different different reaction occurs which provide energy to run the body, so energy possessed in food is chemical energy and which is converted to muscular energy required to run our body.
so option D.

The energy stored in food is :

physics the essence of change forms of energy and energy conservation energy for everything forms of energy

  1. Electrical

  2. Heat

  3. Chemical

  4. Muscular

Show answer
Correct Option: C
Explanation:

 chemical energy is the potential of a chemical substance to undergo a transformation through a chemical reaction to transform other chemical substances.

heat energy is due to temperature.
in food different different reaction occurs which provide energy to run the body, so energy possessed in food is chemical energy.
option C.