Under what conditions heat can be given to a substance without raising its tempearture ?

Heat given to a body which raises its temperature by 1^@C is

Under what condition a transistor works as an open switch?

Under what condition the flow of heat is rapid.

Can heat be added to a substance without causing the temperature of the body of rise? If so does this contradict the concept of heat as energy in the process of transfer because of temperature differece?

Under what conditions is Ohm's law applicable ?

Under what condition, a concave lens can make a real image.

Under what conditions the rate of transpiration increases by

Fill in the blanks If heat energy is given to a substance and its temperature remains constant then the substance undergoes a change in_______.

Under what condition is the tangent to a given curve at a given curve at a point perpendicular to x axis?