Physics questions
20027 published questions with worked solutions.
- A bar of iron is 10 cm at 20^ C . At 19^ C , it will be ( _ Fe = 11 10^ -6 /^ C )
- Two rods of lengths l_1 and l_2 are made of materials whose coefficient of linear expansions are _1 and _2, respectively. If the...
- The radius of a ring is R and its coefficient of linear expansion is . If the temperature of ring increases by , then its...
- If two rods of lengths L and 2L having coefficient of linear expansion and 2 respectively are connected end-on-end, the average...
- A meter rod of silver at 0^ C is heated to 100^ C . It's length is increased by 0.19 cm. Coefficient of volume expansion of the...
- A uniform metal rod is used as a bar pendulum. If the room temperature rises by 10^ C , and the coefficient of linear expansion...
- The coefficient of linear expansion of crystal in one direction is _1 and that in other two directions perpendicular to it is _2....
- A steel rod of diameter 1 cm is clamped firmly at each end when its temperature is 25^ C , so that it cannot contract on cooling....
- How much heat energy is gained when 5 kg of water at 20^ C is brought to its boiling point (Take, specific heat of water = 4.2 kJ...
- A metal block is made from a mixture of 2.4 kg of aluminium 1.6 kg of brass and 0.8 kg of copper. The amount of heat required to...
- A bubble of 8 mol of helium is submerged at a certain depth in water. The temperature of water increases by 30^ C . How much heat...
- A beaker contains 200 g of water. The heat capacity of the beaker is equal to that of 20 g of water. The initial temperature of...
- 100 g of ice at 0^ C is mixed with 100 g of water at 100^ C . What will be the final temperature of the mixture?
- A liquid of mass m and specific heat c is heated to a temperature 2T. Another liquid of mass m/2 and specific heat 2c is heated...
- 0.1 m^3 of water at 80^ C is mixed with 0.3 m^3 of water at 60^ C . The final temperature of the mixture is
- Snow is more heat insulating than ice because
- If the temperature difference on the two sides of a wall increases from 100^ C to 200^ C , its thermal conductivity
- The thermal conductivity of a rod depends on
- Wires A and B have identical lengths and have circular cross-sections. The radius of A is twice the radius of B, i.e. r_A = 2r_B....
- The ends of two rods of different materials with their thermal conductivities, radii of cross-section and lengths all in the...