Assertion `:-` If you are squating down and sudenly get up, you can temporarilly feel light heated.
Reason `:-` Blood flows down from head when we suddenly rise.

Give reasons : When water is heated, we see bubbles rising up.

Assertion : When current is drawn from a cell, chemical energy is converted into heat energy. Reason : This is because wire through which current flows gets heated.

Assertion : We use a thick wire in the secondary of a step down transformer to reduce the production heat . Reason : When the plane of the armature is parallel to the lines of force of magnetic field , the magnitude of induced e.m.f. is maximum .

Assertion and Reason. Mark the correct choice as:Assertion:We can see the rainbow in the sky when the rain starts falling after a spell of bright sunlight. Reason: The rainbow is formed due to disprsion of light.

Assertion : Transformers are used only in alternating current source not in direct current. Reason : Only a.c. can be stepped up or down by means of transformers.

What could you conclude from the above analysis (metal ring lifts up and falls down)?