Tag: production of electricity from solar energy

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

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.

  1. V
  2. $10$V
  3. $100$V
  4. $1000$V
Reveal answer Fill a bubble to check yourself
C Correct answer
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$=\dfrac{1000Kq}{10r}$=$100V$  

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

There will be an increase in potential energy of the system if work is done upon the system by

  1. any conservative or non-conservative forces

  2. a non-conservative force

  3. conservative force

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

Since potential energy defined only for conservative force. It will increase for conservative force.

Multiple choice physics types of energy renewable and non-renewable resources renewable and non-renewable sources of energy production of electricity from solar energy

Potential energy of a body depends on its:

  1. motion

  2. colour

  3. mass

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

We know that potential energy is the energy possesd by the virtue of its position.
So, $F = mgh $
Where, $ m = $ mass
So, From above equation we can deduce that potential energy depends on the mass of the substance.

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

The principle behind the working of an atom bomb is:

  1. Nuclear fussion

  2. Nuclear fission

  3. Radioactivity

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

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

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

  1. 2000 tons of TNT

  2. 20000 tons of TNT

  3. 200000 tons of TNT

  4. 2000000 tons of TNT
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

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