Tag: energy : forms and sources

Questions Related to energy : forms and sources

When a body does some work its energy decreases. 

physics energy : forms and sources concept of energy energy for everything forms of energy

  1. True

  2. False

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Correct Option: A
Explanation:

When a body does some work it uses its energy to provide external force due to which its energy decreases.

Energy is the capacity to do work.

physics energy : forms and sources concept of energy energy for everything forms of energy

  1. True

  2. False

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Correct Option: A
Explanation:

Definition of Energy “Capacity to do work”. If a ball falls due to free fall, its weight will do work, which is transferred to Kinetic Energy when dropped from a certain height. But then it says this is as 'energy is defined as the capacity to do work'

SI unit of energy is  _________ .

physics energy : forms and sources concept of energy energy for everything forms of energy

  1. newton

  2. joule

  3. erg

  4. metre

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Correct Option: B
Explanation:

Joule.

If the values of force and length are increased four times then the unit of energy will increases by?

physics energy : forms and sources concept of energy energy for everything forms of energy

  1. $4$ times

  2. $2$ times

  3. $8$ times

  4. $16$ times

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Correct Option: D
Explanation:

 Force is represented as $\left[ ML{ T }^{ -2 } \right] \quad and\quad length\left[ L \right] $

$energy\quad f\times d\quad is\left[ ML{ T }^{ -2 } \right] \quad \times \left[ L \right] =\left[ M{ L }^{ 2 }{ T }^{ -2 } \right] $
 if Force and length are quadrupled in value Energy
$4\left[ ML{ T }^{ -2 } \right] \quad \times 4\left[ L \right] =16\left[ M{ L }^{ 2 }{ T }^{ -2 } \right] $
unit increased by 16 times 

In geothermal plants steam is raised by pumping water upto the layer of magma.                           .......................

physics energy : forms and sources production of electricity from solar energy solar equipment solar power renewable and non-renewable resources renewable and non-renewable sources of energy

  1. True

  2. False

  3. Ambiguous

  4. Data insufficient

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Correct Option: A
Explanation:

The most common way of capturing the energy from geothermal sources is to tap into naturally occurring 'hydrothermal convection' systems, where cooler water seeps into Earth's crust, is heated up, and then rises to the surface. Once this heated water is forced to the surface, it is a relatively simple matter to capture that steam and use it to drive electric generators. Geothermal power plants drill their own holes into the rock to more effectively capture the steam.
Hence, the statement is true.

A mercury drop of water has potential 'V' on its surface. $1000$ such drops combine to form a new drop. Find the potential on the surface of the new drop.

physics energy : forms and sources renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

  1. V

  2. $10$V

  3. $100$V

  4. $1000$V

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Correct Option: C
Explanation:

Potential of single smaller Hg drop of water =$\dfrac{Kq}{r}$=V-----(1)

and we know potential of n smaller Hg drop of water $=\dfrac{Knq}{R}$------(2)
Volume of 1000 small drops = volume of larger drop
$1000\dfrac{4}{3}\pi {r}^{3}=\dfrac{4}{3}\pi {R}^{3}$
Thus radius of bigger droplet $R=10r$
 Now putting the value of R in equation 2 we get
Potential of larger drop$=\dfrac{1000Kq}{10r}$=$100V$  

The principle behind the working of an atom bomb is:

chemistry energy : forms and sources renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

  1. Nuclear fussion

  2. Nuclear fission

  3. Radioactivity

  4. None of these

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Correct Option: B
Explanation:

Nuclear fission

 The atom bomb , also known as atomic bomb or fission bomb is an explosive device  that derives its destructive force from the fission of heavy elements. Typical fuel for the fission reaction within the bomb is either uranium or plutarium.

The energy released by the Hiroshima bomb was originally thought to be equivalent to the destructive power of approximately 

chemistry energy : forms and sources renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

  1. 2000 tons of TNT

  2. 20000 tons of TNT

  3. 200000 tons of TNT

  4. 2000000 tons of TNT

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Correct Option: B
Explanation:

Blast yard of little bys is equivalent to 15 kilotons(15000 tons)  of TNT. 

 All conventional modern thermonuclear warheads are also called as 

chemistry energy : forms and sources renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

  1. fission-fusion-fission

  2. Neutron bombs

  3. Cobalt bombs

  4. three stage bomb

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Correct Option: A
Explanation:

Fission-fusion-fission 

A typical thermo nuclear warhead may be constructed according to a three stage design featuring a fission, fusion and then again fission. 

 The World Nuclear Association considers used fuel management to be sustainable if it meets the following key criteria:

chemistry energy : forms and sources renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

  1. It covers all the steps of used fuel management from the generation of used fuel up to and including final disposal in accordance with a well defined practical plan.

  2. It proves to be feasible with a sustainable impact level.

  3. It protects human health and the environment and has no greater impact on the health of future generations than is allowed today.

  4. It is able to demonstrate to a practicable extent that it is technically and economically viable.

  5. All of the above

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Correct Option: E
Explanation:

E

The world Nuclear Association considers used fuel management to be sustainable if it meets certain criteria. The criteria includes the covering of all the steps of the used fuel management upto the final disposal with high feasibility. It must protect human health and environment without creating any impact for future generation.