A body of mass 5 kg falls from a height of 30 metre. If its all mechanical energy is changed into heat, then heat produced will be [CPMT 1975]
0.93 watt-hour of energy is supplied to a block of ice weighing 10 gm. It is found that [NCERT 1973; DPMT 1999]
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The weight of a person is 60 kg. If he gets 105 calories heat through food and the efficiency of his body is 28%, then upto how much height he can climb (approximately) [AFMC 1997]
Water falls from a height of 210m. Assuming whole of energy due to fall is converted into heat the rise in temperature of water would be (J = 4.3 Joule/cal) [Pb. PMT 2002]
Triple point of water is [CPMT 2002]
When a bimetallic strip is heated, it [CBSE PMT 1990]
A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will [AFMC 1997; Orissa PMT 2004]
If the length of a cylinder on heating increases by 2%, the area of its base will increase by [CPMT 1993; BHU 1997]
Ratio among linear expansion coefficient a, areal expansion coefficient b and volume expansion coefficient g is [RPMT 2000]
A cylindrical metal rod of length L0 is shaped into a ring with a small gap as shown. On heating the system
The water equivalent of a 400 g copper calorimeter (specific heat=0.1cal/g∘C) (in gm)
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500∘Cand then placed on large ice block. The maximum amount (in kg) of ice that can melt is (Specific heat of copper =0.39Jg-1∘C-1, latent heat of fusion of water=335Jg-1)
The temperatures of equal masses of three different liquids A, B and C are12ºC, 19ºCand 28ºCrespectively, the temperature when A and B are mixed is 16ºCand when B and C are mixed is 23ºC, what would be the temperature when A and C are mixed? (in ºC)(answer in two digit rounded off after decimal)
Assertion : A brass disc is just fitted in a hole in a steel plate. The system must be cooled to loosen the disc from the hole. Reason : The coefficient of linear expansion for brass is greater than the coefficient of linear expansion for steel.
Assertion : Two bodies at different temperatures, if brought in thermal contact do not necessary settle to the mean temperature.
Reason : The two bodies may have different thermal capacities.