Tag: physics

Questions Related to physics

Kinetic energy and potential energy are the two forms of

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. thermal energy

  2. nuclear energy

  3. chemical energy

  4. mechanical energy

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Correct Option: D
Explanation:

There are two different forms of mechanical energy,

i.e. kinetic energy and potential energy.

Identify an example of kinetic mechanical energy?

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. A loaded gun

  2. A set mouse trap

  3. An elevated wrecking ball

  4. A compressed spring

  5. A bike rolling down a hill

Show answer
Correct Option: E
Explanation:

A loaded gun, a set mouse trap and a compressed spring are examples of elastic potential energy.

An elevated wrecking ball is an example of gravitational potential energy.
A bike rolling down a hill is an example of kinetic energy, where potential energy is constantly converting in the kinetic energy of the bike as given by $\dfrac{1}{2}mv^2$.

Which of the following type of wave is created by solar energy?

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. mechanical

  2. electromagnetic

  3. terminal

  4. physical

  5. nuclear

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Correct Option: B
Explanation:

Sun gives out light, which is an electromagnetic wave. Several nuclear reactions take place in Sun's core and thus light is produced.

Select the best definition of mechanical energy?

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. Energy possessed by an object due to its location or motion

  2. Energy possessed by an object due to its temperature

  3. Energy possessed by an object due to its magnetic property

  4. Energy of an object due to its concentration

  5. Energy possessed by an object due to its age

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Correct Option: A
Explanation:

Mechanical energy is the energy that is possessed by an object due to its motion or due to its position. Mechanical energy can be either kinetic energy(energy of motion) or potential energy (stored energy of position). 

What is the relationship between the kinetic energy($K$), potential energy($P$) and total energy($E$) of a system?

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. $K=P+E$

  2. $E=P+K$

  3. $P=K+E$

  4. $E=PK$

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Correct Option: B
Explanation:

Total mechanical energy of the system is equal to the sum of kinetic energy of the system and the potential energy of the system.

Thus, total mechanical energy  $E = K+P$

Total energy of body is the sum of:

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. kinetic energies

  2. potential energies

  3. forces

  4. both A and B

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Correct Option: D
Explanation:

Total energy of the body is the sum of potential energy and kinetic energy.


Hence correct answer is option $D $ 

A body of mass $15\ kg$ is raised from certain depth. If the work done in raising it by $10m$ is $1620J$, its velocity at this position is$(g=10 { ms }^{ -2 })$:

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. ${ 2\ ms }^{ -1 }$

  2. ${ 4\ ms }^{ -1 }$

  3. ${ 1\ ms }^{ -1 }$

  4. ${ 8\ ms }^{ -1 }$

Show answer
Correct Option: B
Explanation:

work done=PE+KE

$1620=mgh+\dfrac{mv^2}{2}$
$1620=15\times 10\times 10+\dfrac{15v^2}{2}=1500+\dfrac{15v^2}{2}$
$v=4m/s$

A body of mass 5 kg falls from a height of
30 metre. If its all mechanical energy is changed into heat, then heat produced
will be:-

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. 350cal

  2. 150 cal

  3. 60cal

  4. 6cal

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Correct Option: A
Explanation:
work done $=mgn$
$= 5 \times 9.8 \times 30 = 14705$
Heat produce $=\dfrac{1470}{4.2}= \boxed{350\ cal}$
$\boxed {Answer\ is\ A}$



























The conservation principle of mechanical energy requires that

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. The acceleration should be zero

  2. There should be no external forces

  3. The motion should be restricted to the gravitational force

  4. The force should be conservative

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Correct Option: B

Mechanical Energy is conserved under

physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy

  1. Conservative system of forces

  2. disipative forces

  3. (A) and (B)

  4. none of these

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Correct Option: C