Various Forms of Energy and Law of Conservation of Energy

A small sphere is attached to a cord and rotates in a vertical circle about a point $O$. If the range speed of the sphere is increased, the cord is most likely to break at the orientation when the mass is at:

A stone tied to a string is rotated in a vertical circle. The minimum speed of the stone during a complete vertical circular motion 

What part of an electric circuit is the source of electrical energy?

A particle of charge $Q$ moves with speed $v$ directly towards another particle of charge $Q^{\text{'}}$ which is connected to a light spring. The far end of the spring is fixed to a smooth horizontal table. Let $P$ and $E$ be the total momentum and energy of the charge-spring system respectively. Ignore gravity. Then

The bob of a simple pendulum of length $4 \mathrm{m}$ is held so that the string is horizontal and then let go. The velocity of the bob when it reaches the lowest position is (Take $g=9.8 \mathrm{m} {\mathrm{s}}^{-2}$)

Which of the Following can be Used to Express Energy? (The Symbols used have their usual meanings for each unit of Physical Quantities)

1. Wh
2. VC
3. VAs²
4. A²$\Omega$s

A dynamo develops 1A and 8V. The energy which it generates in one second is 

The material used for the constraction of central rod in a nuclear reactor is-

Which is the largest uranium producing country in the world?

In nuclear power station, moderator is used to-

A piston cylinder expends with some pressure, what is the work done by the system?

A piston cylinder is compressed with some pressure, what is the work done on the system?

Which of the following process $\mathrm{P}-\mathrm{V}$ work in highest?

Which of the following is not the type of energy?

When objects of equal mass X, Y,  and Z are thrown from their positions in different horizontal lanes with velocities v, 2v, 2v, all three stand in d alignment

Match the columns
    Column I                                                                                        Column II
(i) The sources of solar energy                                                        $1.$Chemical energy
(ii) Emission of $\gamma$-rays                                                                      $2.$Nuclear fission reaction
(iii) Sodium donates a electron to chlorine 
(iv) Making of heavy metal while the formation of universe         $3.$Nuclear fusion reaction
(iv) Reaction in a nuclear reactor at Bhabha Atomic                     $4.$Radioactivity
      Research Centre, Mumbai
Choose the appropriate match.

The mass defect is the result of what action occurring

100 g of ice at $15$°C was heated. The rise in the temperature of ice was plotted against the heat given to the ice. Which of the following graphs correctly depicts this behavior?

A graph was plotted taking the temperature in °C along the X-axis and the corresponding temperature in Kelvin along the Y-axis. Which of the curves in the given figure most correctly represents this behavior?

A body of mass $2 \mathrm{kg}$ collides with a wall at a speed of $100 \mathrm{m} {\mathrm{s}}^{-1}$  and rebounds with the same speed. If the time of contact is $\frac{1}{10} \mathrm{s}$, the force exerted on the wall is