Tag: the essence of change

Questions Related to the essence of change

Select the correct option given below:
How much work can be obtained from 100 calories of heat energy?

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

  1. 100 J

  2. 420 J

  3. 42 J

  4. 4200 J

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Correct Option: B
Explanation:

$1\ cal=4.2\ J$

$\because$ Work done = heat obtained in calories $\times 4.2$

or $W=100 \times 4.2=420 J$

Which type of energy does the food we eat have.?

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

  1. Electrical energy

  2. Chemical energy.

  3. Solar energy

  4. Sound energy

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Correct Option: A
Explanation:

Chemical energy

Energy associated with moving objects is called:

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

  1. Potential energy

  2. Kinetic energy

  3. No energy

  4. Work

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Correct Option: B
Explanation:

energy which a body possesses by virtue of being in motion.

The form of energy stored in kerosene is:

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

  1. chemical

  2. heat energy

  3. magnetic

  4. mechanical

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Correct Option: A
Explanation:

Kerosene is the by-product of crude oil, which is a fossil fuel. In fossil fuels, energy is stored in the form of chemical energy, which is converted into heat and light energies when burnt.

Heat is a form of :

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

  1. Force

  2. Energy

  3. Work

  4. Simple machine

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Correct Option: B
Explanation:

Heat is a form of energy.  Heat energy is transferred from one body to another as the result of a difference in temperature.

Its SI unit is $\textrm {Joule}$.

A solar cell converts solar energy into:

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

  1. Chemical energy

  2. Light energy

  3. Electrical energy

  4. Muscular energy

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Correct Option: C
Explanation:

In a solar cell, solar energy from the Sun is converted into electrical energy. This electrical energy is used by the various electrical appliances.

Hydro-electric power generates

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

  1. Electrical energy

  2. Nuclear energy

  3. Thermal energy

  4. None of these

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Correct Option: A
Explanation:

Hydro-electric power is the process where moving water rotates the turbine. Here potential energy of water converts into kinetic enery of water when waters falls downwards from a height.

After that kinetic energy of water transferred to kinetic energy of turbine and turbine starts rotating. 
After this turbine's kinetic energy is converted into electrical energy and in this way electricity is generated. 
Hence hydro-electric power generates electrical energy.

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

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Correct Option: B