Tag: energy and its forms

Questions Related to energy and its forms

The negative of the work done  by the conservative internal forces on a system equals to the change in 

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. total energy

  2. Kinetic energy

  3. Potential energy

  4. None of these

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Correct Option: C
Explanation:

The negative of the work done  by the conservative internal forces on a system equals to the change in potential energy


Hence, correct answer is option $C$

$1\  hp$ is equal to:

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. $0.746\  kW$

  2. $7.46\  kW$

  3. $74.6\  kW$

  4. $746 \ kW$

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Correct Option: A
Explanation:

Horsepower (hp) is a unit of measurement of power (the rate at which work is done).A power level of 1 hp is approximately equivalent to $746$ watt (W) or $0.746$ kilowatt (kW).

The unit of work is joule $(J)$ in the $SI$ system and erg in the $CGS$ system. Find number of ergs in $1\ joule$.

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. $10^{17} ergs$.

  2. $10^{9} ergs$.

  3. $10^{8} ergs$.

  4. $10^{7} ergs$.

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Correct Option: D

Which one is not a unit of energy.

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. Electron-volt

  2. Joule

  3. Calorie

  4. Watt

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Correct Option: C

How many joules are equivalent to $1$ unit of electricity.

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. $3.6\times{10}^{3}$

  2. $3.6\times{10}^{4}$

  3. $3.6\times{10}^{5}$

  4. $3.6\times{10}^{6}$

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Correct Option: D

A body of $1000 kg$ moving with $0.3m/s$ in +x direction. A hole is present at the bottom of body such that, mass is dropping at rate of $20 gm/sec$, inn -y direction. Find out force exerted by ejecting mass on body.

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. 0.4 N

  2. 0 N

  3. 0.6 N

  4. None of these

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Correct Option: A

Work done charge of mass 2 Kg due to external force against electrostatics force is - 10 J if charge is displaced from A to B. Velocity of charge at point A is 4m/s and at B is 2m/s then find difference is electropotential energy $ (U _s - U _A) $

physics energy and its forms idea of energy introduction to work and energy work and energy
    • 10J
    • 10J
    • 21J
    • 2J
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Correct Option: A

Taking the unit of work as Joule and the unit of amount of heat as K cal, the magnitude in Joule for mechanical equivalence of heat is:

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. $1$

  2. $4.2 \times 10^7$

  3. $4.2$

  4. $4.2 \times 10^3$

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Correct Option: D
Explanation:

$1\ kcal=4.2\times1000=4.2\times10^3\ J$


How many joules is equal to one calorie?

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. 1

  2. 0

  3. 2

  4. 3

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Correct Option: A
Explanation:

 1 calorie = 4.2 joules

Define the term calorie. How is it related to joule ?

physics energy and its forms idea of energy introduction to work and energy work and energy

  1. The amount of energy requires to raise the temperature of 1 gram of water by 1° Celsius, 1 Cal = 4.18 J

  2. The amount of energy requires to raise the temperature of 1 gram of water by 1 Kelvin, 4.18 Cal = 1 J

  3. The amount of energy requires to raise the temperature of 1 gram of water by 1 Fahrenheit, 4.18 Cal = 1 J

  4. The amount of energy requires to raise the temperature of 1 gram of ether by 1° Celsius, 1 Cal = 4.18 J

Show answer
Correct Option: A
Explanation:
The term calorie can be defined as the energy needed to raise the temperature of 1 gram of water by $ 1$ °C. 
$1 \ cal = 4.18 \ J$