In which case bodies become hot due to mechanical energy losses
(i) Rub our hands for sometimes
(ii) Two vehicles collied with each other
(iii) Aeroplane crases
(iv) Sliding of legs on roof surface
(v) Transfer of energy from hot energy from hot body to cold body

Heat energy flows from a hot body to a cold body.

True or False. If false, give the correct statement: Heat is a kind of energy that flows from a hot body to a cold body.

Categorise in to reversible and irreversible process. (i) Water fall, (ii) rusting of iron, (iii) electrolysis, (iv) diffusion of gas. (v) melting of ice, (vi) dissolving NaCl in water, (vii) flow of heat from hot body to cool body

A body is projected from ground with velocity u making an angle theta with horizontal. Horizontal range of body is four time to maximum height attained by body. Find out (i) angle of projection (ii) Range and maximum height in terms of u (iii) ratio of kinetic energy to potential energy of body at maximum height

A body is projected from ground with velocity u making an angle theta with horizontal. Horizontal range of body is four time to maximum height attained by body. Find out (i) angle of projection (ii) Range and maximum height in terms of u (iii) ratio of kinetic energy to potential energy of body at maximum height

A body is projected from ground with velocity u making an angle theta with horizontal. Horizontal range of body is four time to maximum height attained by body. Find out (i) angle of projection (ii) Range and maximum height in terms of u (iii) ratio of kinetic energy to potential energy of body at maximum height

Which of the following parts of our body help us in movement? (i) Bones (ii) Skin (iii) Muscles (iv) Organs Choose the correct answer from the option below.

The intensity of energy radiated by a hot body at distance r from it varies as .

Consider the statement (A) and (B) and identify the correct answer. A: First law of thermodynamics specifies the condition underwhich a body can use its heat energy to produce the work. B: Second law of thermodynamics states that heat always flows from hot body to cold body by itself