Tag: substances, objects and energy

Quizzes (5) Questions (175)

Questions Related to substances, objects and energy

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy 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

  1. $18$ J
  2. $19$ J
  3. $20$ J
  4. $10$ J
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The mechanical energy E of the particle is the sum of its kinetic energy and potential energy at any point. At x = 2 m, U(2) = 10 + (2-1)^2 = 10 + 1 = 11 J. Given kinetic energy K = 8 J, the total mechanical energy is E = U + K = 11 + 8 = 19 J.

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

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

  1. $1.6\ kg\ m^{2}$
  2. $0.3\ kg\ m^{2}$
  3. $0.7\ kg\ m^{2}$
  4. $1.2\ kg\ m^{2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
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.

Multiple choice 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

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

  1. 0.2%

  2. 0.7%

  3. 98%

  4. 100%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Natural uranium consists of about 99.3% U-238 and only about 0.7% U-235. The question asks for the percentage of U-235 in natural uranium.

Multiple choice 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

How many nuclear power stations does India have at present?

  1. 2

  2. 3

  3. 4

  4. None of these
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

India has more than 4 nuclear power stations currently operating including Tarapur, Rawatbhata, Kudankulam, Kaiga, Kakrapar, and Narora. The number changes as new reactors come online, making 'None of these' the only consistently correct answer.

Multiple choice 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

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

  1. Jharkhand

  2. Madhya Pradesh

  3. Maharashtra

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Jaduguda mine is a uranium mine located in the Purbi Singhbhum district of the state of Jharkhand in India.

Multiple choice 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

Sound is form of

  1. Energy

  2. Matter

  3. Radiation

  4. Electromagnetic energy

  5. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
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.

Multiple choice 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

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

  1. nuclear energy

  2. methane

  3. thermal energy ocean

  4. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Seaweed and other biomass can be processed through anaerobic digestion to produce methane, which is a useful fuel source.