A piece of lead is hammered. Does its internal energy increase? Does the heat enter the lead from outside?

An ideal gas is compressed isothermally . Does its internal energy increase ?

The internal energy of a perfect gas does not change during

110J of heat is supplied to a gaseous system whose internal energy increases by 40J . The amount of external work done is

A thermos flask containing tea is shaken vigorously considering tea as a system. (a) Has heat been added to tea? (b) Has work been done on it? (c) Has its internal energy changed? (d) Does its temperature rise?

The ratio of specific heat of a agas at constatnt pressure to that constatnt volume is gamma . The change in internal energy of one mole of a gas when volume changes from V to 2V at constant pressure P is

Does the pressure of a gas,on heating,increases?

A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?

The reaction, Cr_2O_3 + 2Al rarr Al_2O_3 + 2Cr (DeltaG^@ = -421KJ) is thermodynamically feasible as is apparent from the Gibbs energy value. Why does it not take place at room temperature?

Why does velocity increase when water flowing in broader pipe enters a narrow pipe?