Tag: substances, objects and energy

Questions Related to substances, objects and energy

A single conservative force F(x) acts on a $1$ kg particle that moves along the x-axis. The potential energy U(x) is given by $U(x) = 10+(x-1)^2$ Where x is in meters. At x =$2$ m, the particle has a kinetic energy of $8$ Joules. Then the mechanical energy of particle is

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

  1. $18$ J

  2. $19$ J

  3. $20$ J

  4. $10$ J

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Correct Option: A

If $484J$ of energy is spent in increasing the speed of a wheel from $60rpm$ to $360\ rpm$, the $M.I$ of the wheel is

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

  1. $1.6\ kg\ m^{2}$

  2. $0.3\ kg\ m^{2}$

  3. $0.7\ kg\ m^{2}$

  4. $1.2\ kg\ m^{2}$

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Correct Option: C
Explanation:

$\begin{array}{l} { \eta _{ 1 } }=60rpm=\dfrac { { 60 } }{ { 60 } } rps=1rps \ \therefore { w _{ 1 } }=2r{ \eta _{ 1 } }=2\pi  \ { \eta _{ 2 } }=\dfrac { { 360 } }{ { 60 } } rpm=6rps \ { w _{ 2 } }=2\pi { \eta _{ 2 } }=12\pi  \end{array}$

484 joule of energy is spent in increasing.
$\begin{array}{l} \frac { 1 }{ 2 } Iw _{ 2 }^{ 2 }-\dfrac { 1 }{ 2 } Iw _{ 1 }^{ 2 }=484 \ \dfrac { I }{ 2 } \left( { { w _{ 2 } }+{ w _{ 1 } } } \right) \left( { { w _{ 2 } }-{ w _{ 1 } } } \right) =484 \ \dfrac { I }{ 2 } \left( { 12\pi +2\pi  } \right) \left( { 12\pi -2\pi  } \right) =484 \ I\, \, 14\pi .10\pi =484 \ I=\dfrac { { 484\times 2 } }{ { 140\times { \pi ^{ 2 } } } } =\dfrac { { 484\times 2 } }{ { 140\times 9.86 } }  \ =0.7\, \, kg\, \, { m^{ 2 } } \end{array}$
Option C.

State True or False :
Coal forms from plants. 

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

  1. True

  2. False

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Correct Option: A
Explanation:

Coal is fossil fuel formed from remains of plants that lived and died millions of years ago.

Which is a non-renewable energy resource?

physics sources of energy renewable and non-renewable resources renewable and non-renewable sources of energy substances, objects and energy production of electricity from solar energy

  1. coal

  2. solar

  3. tides

  4. wind

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Correct Option: A
Explanation:

All fossil fuels are non- renewable source of energy. Since coal is a fossil fuel so, it is a non renewable resource.

What is the percentage of ${92} _U^{235} in \,92 _U^{238}$?

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. 0.2%

  2. 0.7%

  3. 98%

  4. 100%

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Correct Option: B

How many nuclear power stations does India have at present?

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. 2

  2. 3

  3. 4

  4. None of these

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Correct Option: D

India's uranium supply comes mainly from the Jaduguda mines in.

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. Jharkhand

  2. Madhya Pradesh

  3. Maharashtra

  4. None of these

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Correct Option: A

In India, uranium is found in.

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. U.P

  2. M.P

  3. Bihar

  4. Orissa

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Correct Option: C

Sound is form of

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. Energy

  2. Matter

  3. Radiation

  4. Electromagnetic energy

  5. None of the above

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Correct Option: A
Explanation:

Sound is considered as a form of energy because it obeys the First Law of Thermodynamics which states that energy can neither be created nor destroyed but it changes from one form to another. Sound energy is produced when an object vibrates. The sound vibrations cause waves of pressure that travel through a medium, such as air, water, wood or metal. Sound energy is a form of mechanical energy.

The vast amount of ses weeds present in oceans may provide an endless source of.

evs - i substances, objects and energy renewable and non-renewable resources renewable and non-renewable sources of energy solar energy and its applications renewable resources alternative fuels and energy sources alternative sources of energy

  1. nuclear energy

  2. methane

  3. thermal energy ocean

  4. none of these

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Correct Option: B