## Class 11 Physics – Calorimetry Multiple Choice Questions And Answers

**Question 1. The amount of heat required by 1 g of a substance for its 1 °C rise in temperature is called its**

- Specific heat
- Thermal capacity
- Water equivalent
- Latent heat

**Answer:** 1. Specific heat

**Question 2. SI unit of heat is**

- cal
- kcal
- J
- W

**Answer:** 3. J

**Question 3. Mean calorie means**

- The amount of heat required to increase the temperature of 1 g water from 0°c to 1°c
- The amount of heat required to increase the temperature of 1 g water from 50°c to 51 °c
- The amount of heat required to increase the temperature of 1 g water from 14.5°c to 15.5°c
- 1/100 part of the amount of heat required to increase the temperature of 1 g water from 0°C to 100°C

**Answer:** 4. 1/100 part of the amount of heat required to increase the temperature of 1 g water from 0°C to 100°C

**Question 4. If the amount of heat required by mass m of a substance for a rise t in temperature be H, then**

- \(t \propto m H\)
- \(t \propto \frac{H}{m}\)
- \(t \propto \frac{m}{H}\)
- \(t \propto \frac{1}{m H}\)

**Answer:** 2. \(t \propto \frac{H}{m}\)

**Question 5. cal · g ^{-1} · °C^{-1} is the unit of**

- Specific heat capacity
- Thermal capacity
- Water equivalent
- Latent heat

**Answer:** 1. Specific heat capacity

**Question 6. Which of the following substances has the highest specific heat?**

- Mercury
- Water
- Iron
- Diamond

**Answer:** 2. Water

**Question 7. Due to higher specific heat of water compared to other solids and liquids**

- Water warms up quickly but cools down slowly
- Water cools down quickly but warms up slowly
- Water warms up or cools down slowly
- Water warms up or cools down quickly

**Answer:** 3. Water warms up or cools down slowly

**Question 8. To cool down the engine of a car, water is used in the radiator because**

- Water is easily available
- Water does not cause any harm to the radiator
- Viscosity of water is much less
- Specific heat of water is high

**Answer:** 4. Specific heat of water is high

**Question 9. During boiling of water at 100°C, what will be its specific heat?**

- Zero
- 0.5
- 1
- Infinite

**Answer:** 4. Infinite

**Question 10. If the temperature of 1 g of water is raised by 1°C for what initial temperature the heat gained is equal in magnitude to the mean calorie?**

- 0°C
- 14.5°C
- 15°C
- 15.5°C

**Answer:** 2. 14.5°C

**Question 11. An alternative name of ‘mean calorie’ is**

- 0°- 100°C cal
- 14.5°C cal
- 15°C cal
- 15.5°C cal

**Answer:** 3. 15°C cal

**Question 12. The temperature range and pressure, at which the heat required by 1 g water for 1° C rise in its temperature is called 1 cal, is**

- 3.5°C to 4.5°C, 76 cm of Hg
- 13.5°C to 14.5°C, 76 mm of Hg
- 14.5°C to 15.5°C, 760 mm of Hg
- 98.5°C to 99.5°C, 760 mm of Hg

**Answer:** 3. 14.5°C to 15.5°C, 760 mm of Hg

**Question 13. 10 g of water is supplied with 420 J of energy. The rise in temperature of water is**

- 1°C
- 4.2°C
- 10°C
- 32°C

**Answer:** 3. 10°C

**Question 14. If the specific heat of a substance is infinite, it means**

- Heat is given out
- Heat is taken in
- No change in temperature takes place whether heat is taken in or given out
- All of the above

**Answer:** 3. No change in temperature takes place whether heat is taken in or given out

**Question 15. Calorimeters are made of which of the following?**

- Glass
- Metal
- Wood
- Either 1 or 3

**Answer:** 2. Metal

**Question 16. Mass m of a substance requires an amount H ofheatfor a rise r in temperature. If the specific heat of the substance be s, then its water equivalent is**

- \(H m s_w\)
- \(m s_w t\)
- \(\frac{m s}{s_w}\)
- \(\frac{s t}{s_w}\)

**Answer:** 3. \(\frac{m s}{s_w}\)

**Question 17. Thermal capacity of a body of mass 10 g is 8 cal · °C ^{-1}. The specific heat of the material of the body is**

- 0.8
- 1.25
- 0.4
- 0.1

**Answer:** 1. 0.8

**Question 18. If the specific heat of copper is 0.1 cal · g ^{-1} · °C^{-1}, then water equivalent of a copper calorimeter of mass 0.4 kg is**

- 40 g
- 4000 g
- 200 g
- 4g

**Answer:** 1. 40 g

**Question 19. The ratio of the radii of two spheres made of the same material is 1:4. The ratio of their thermal capacities is**

- 1/4
- 1/32
- 1/2
- 1/4

**Answer:** 1. 1/4

**Question 20. The ratio of the densities of two materials is 5 : 6 and of their specific heats is 3:5. The ratio of their thermal capacities per unit volume will be**

- 1:2
- 2:1
- 3:2
- 2:3

**Answer:** 1. 1:2

**Question 21. When two bodies at different temperatures are brought in contact, the basic principle of calorimetry (heat lost = heat gained) can not be applied if**

- The two bodies do not mix well with each other
- Any of the bodies undergo a change of state
- Specific beats of the two bodies are widely different
- Chemical reaction occurs between the bodies

**Answer**: 4. Chemical reaction occurs between the bodies

**Question 22. If no change of state occurs, which of the following quantities is not required for the calculation of heat lost or heat gained?**

- Mass
- Density
- Specific Heat
- Change In Temperature

**Answer:** 2. Density

**Question 23. The ratio of specific heats of two liquids is 1: 2. If the two liquids at different temperatures are mixed in the ratio 2 : 3 of their masses, then what will be the ratio of h changes in their temperatures?**

- 1:3
- 1:6
- 3:1
- 6:1

**Answer:** 3. 3:1

**Question 24. The specific heat of aluminium is more than that of copper. TWo spheres of equal masses made of these two metals are immersed in a hot liquid. In equilibrium**

- The temperature of aluminium sphere will be greater.
- The temperature of both spheres will be equal
- The temperature of copper sphere will be greater
- None of the above

**Answer:** 2. The temperature of both the spheres will be equal

**Question 25. A liquid of mass M and specific heat S is at a temperature 2t. If another liquid of thermal capacity 1.5 times, at a temperature of | is added to it, the resultant temperature will be**

- 4/3 t
- t
- t/2
- 2/3 t

**Answer:** 2. t

**In tills type of questions more than one options are correct.**

**Question 26. Thermal capacity of a body depends on**

- The heat given
- The temperature raised
- The mass of the body
- The material of the body

**Answer:**

3. The mass of the body

4. The material of the body

**Question 27. The specific heat of a substance can be**

- Finite
- Infinite
- Zero
- Negative

**Answer:**

- Finite
- Infinite
- Zero

**Question 28. When two samples at different temperatures are mixed, the temperature of the mixture can be**

- Lesser than lower or greater than higher temperature
- Equal to lower or higher temperature
- Greater than lower but lesser than higher temperature
- Average of lower and higher temperature

**Answer:**

2. Equal to lower or higher temperature

3. Greater than lower but lesser than higher temperature

4. Average of lower and higher temperature