NEET Physics Calorimetry and Heat Transfer Online Test Set A

1. A student takes 50gm wax (specific heat = 0.6 kcal/kg°C) and heats it till it boils. The graph between temperature and time is as follows. Heat supplied to the wax per minute and boiling point are respectively

2. Two spheres of different materials one with triple the radius and one-fifth wall thickness of the other are filled with ice. If the time taken for complete melting of ice in the larger sphere is 30 minute and for smaller one is 20 minute, the ratio of thermal conductivities of the materials of larger spheres to that of smaller sphere is

3. A 2 kg copper block is heated to 500°C and then it is placed on a large block of ice at 0°C. If the specific heat capacity of copper is 400 J/kg°C and latent heat of fusion of water is 3.5 × 10⁵ J/kg, the amount of ice that can melt is

4.

5. 19 g of water at 30°C and 5 g of ice at – 20°C are mixed together in a calorimeter. What is the final temperature of the mixture? Given specific heat of ice = 0.5 cal g^–1(°C)^–1 and latent heat of fusion of ice = 80 cal g^–1

6. In a water-fall the water falls from a height of 100 m. If the entire K.E. of water is converted into heat, the rise in temperature of water will be

7. In an energy recycling process, 100 g of steam at 100°C becomes water at 100°C which converts y g of ice at 0°C into water at 100°C. The numeric value of y is

8. A hammer of mass 1 kg having speed of 50 m/s, hit a iron nail of mass 200 gm. If specific heat of iron is 0.105 cal/gm°C and half the energy is converted into heat. the raise in temperature of nail is

9. Certain amount of heat is given to 100 g of copper to increase its temperature by 21° C. If the same amount of heat is given to 50 g of water, then the rise in its temperature is
(Specific heat capacity of copper = 400 J kg^–1 K^–1 and that for water = 4200 J kg^–1 K^–1)

10. A lead bullet strikes against a steel plate with a velocity 200 m s^–1. If the impact is perfectly inelastic and the heat produced is equally shared between the bullet and the target, then the rise in temperature of the bullet is (specific heat capacity of lead = 125 J kg^–1 K^–1)

11. Assuming no heat losses, the heat released by the condensation of x g of steam at 100°C can be used to convert y g of ice at 0°C into water at 100°C, the ratio x : y is :

12. A block of ice at – 10°C is slowly heated and converted to steam at 100°C. Which of the following curves represents the phenomenon qualitatively

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15. Consider the following statements and select the correct statement(s).
I. Water and ice have same specific heats
II. Water and ice have different specific heats
III. Specific heat of water is more than that of ice
IV. Specific heat of ice is more than that of water

16. 500 g of water and 100 g of ice at 0°C are in a calorimeter whose water equivalent is 40 g. 10 g of steam at 100°C is added to it. Then water in the calorimeter is : (Latent heat of ice = 80 cal/g, Latent heat of steam = 540 cal/ g)

17. Six identical conducting rods are joined as shown in figure. Points A and D are maintained at 200°C and 20°C respectively. The temperature of junction B will be

18. Which of the following is used as a coolent in automobile radiator as well as a heater in hot water bags?

19.

20. A quantity of heat required to change the unit mass of a solid substance, from solid state to liquid state, while the temperature remains constant, is known as

21. Which of the following statements regarding specific heat capacity of a substance are correct ? It depends on
I. mass of substance.
II. nature of substance.
III. temperature of substance.
IV. volume of substance

22.

23. The latent heat of vaporization of a substance is always

24. 4200 J of work is required for

25. Sweet makers do not clean the bottom of cauldron because

26. Three bodies A, B and C have equal area which are painted red, yellow and black respectively. If they are atsame temperature, then

27. Good absorbers of heat are

28. Heat is transmitted from higher to lower temperature through actual mass motion of the molecules in

29. If two rods A and B of equal length L, and different areas of cross-section A₁ and A₂ have one end each at temperature T₁ and T₂, have equal rates of flow of heat, then

30. Mass of water which absorbs or emits the same amount of heat as is done by the body for the same rise or fall in temperature is known as