# WBBSE Class 9 Physical Science MCQ Questions Chapter 6 Heat

Well structured WBBSE Class 9 Physical Science MCQ Questions Chapter 6 Heat can serve as a valuable review tool before exams.

## Heat Class 9 WBBSE MCQ Questions

Multiple Choice Questions :

Question 1.
What is the unit of heat in SI system ?
(i) calorie
(ii) Joule
(iii) erg
(iv) Newton
Joule

Question 2.
Who designed absolute scale of temperature ?
(i) Newton
(ii) Lord Kelvin
(iii) Celsius
(iv) Boyle
Lord Kelvin

Question 3.
Which substance has the highest specific heat ?
(i) water
(ii) iron
(iii) gold
(iv) ice
Water

Question 4.
The fundamental interval of celsius scale is divided into –
(i) 100
(ii) 180
(iii) 120
(iv) 102 division
100

Question 5.
The fundamental interval of Fahrenheit scale is divided into
(i) 180
(ii) 100
(iii) 32
(iv) 212 division
180

Question 6.
If C and F represent a particular temperature in Celsius and Fahrenheit scales respectively, then their relation is :
(i) $$\frac{C}{4}$$ = $$\frac{F-32}{9}$$
(ii) $$\frac{C}{5}$$ = $$\frac{F-32}{9}$$
(iii) $$\frac{C}{3}$$ = $$\frac{F-32}{5}$$
(iv) $$\frac{C}{9}$$ = $$\frac{F-32}{5}$$
$$\frac{C}{5}$$ = $$\frac{F-32}{9}$$

Question 7.
The temperature of a body is measured by the instrument :
(i) hydrometer
(ii) thermometer
(iii) voltameter
(iv) ammeter
thermometer

Question 8.
How much calorie of heat would be produced by converting 42 joule of work completely into heat ?
(i) 100 calorie
(ii) 10 calorie
(iii) 1000 calorie
(iv) 90 calorie
10 calorie

Question 9.
Normal body temperature of a man is –
(i) 98.4° C
(ii) 98.4° F
(iii) 98.4 K
(iv) 100° F
98.4° F

Question 10.
Which substance has the highest specific heat?
(i) ethanol
(ii) water
(iii) acetone
(iv) ether
water

Question 11.
If the specific heat of copper be 0.09, what will be the water equivalent of a block of copper of mass 50 g ?
(i) 45 g
(ii) 4.5 g
(iii) 450 g
(iv) 44 g
4.5 g

Question 12.
What is the melting point of ice in Fahrenheit scale ?
(i) 0° F
(ii) 32° F
(iii) 180° F
(iv) 121° F
32° F

Question 13.
What is the specific heat of water in SI system ?
(i) 4 2 joule
(ii) 4200 joule/kg
(iii) 4200 joule/kg/K
(iv) 42 erg
4200 joule / kg / K

Question 14.
The dimension of heat is –
(i) M L T
(ii) M L2 T-2
(iii) M L-1 T-2
(iv) M L-1 T-1
ML2 T-2

Question 15.
Generally body temperature of a man is measured in :
(i) Celsius scale
(ii) Fahrenheit Scale
(iii) Kelvin scale
(iv) none of these
Fahrenheit

Question 16.
Heat reaches the earth from the sun by the process of –
(i) conduction
(ii) convection
(iv) expansion

Question 17.
The value of mechanical equivalent of heat in CGS system is :
(i) 4.18 × 107 erg / calorie
(ii) 4.8 erg / calorie
(iii) 5.18 × 107 erg / calorie
(iv) 5.18 erg / calorie
4.18 × 107 erg / calorie

Question 18.
How much work is to be done to produce 50 calorie of heat ?
(i) 210 joule
(ii) 200 joule
(iii) 201 joule
(iv) 310 joule
210 joule

Question 19.
The water equivalent of a body is equal to :
(i) mass of the body x specific heat
(ii) mass of the body / specific heat
(iii) mass of the body + specific heat
(iv) mass of the body – specific heat
Mass of the body × specific heat

Question 20.
Mercury remains in liquid state for long range of temperature :
(i) -39° C to 357° C
(ii) -57° C to 457° C
(iii) -10° C to 257° C
(iv) -12° C to 122° C
-39° C to 357° C

Question 21.
-40° C is equal to :
(i) -50° F
(ii) -40° F
(iii) -60° F
(iv) -80° F
-40° F

Question 22.
1 Calorie is equal to –
(i) 4.18 Joule
(ii) 5.18 Joule
(iii) 3.18 Joule
(iv) 4.18 erg
4-18 Joule.

Question 23.
If a temperature in Kelvin scale is TK and the temperature in Celsius scale is t° C, the relation is :
(i) TK = (273 + t°C)
(ii) TK = (273 – t°C)
(iii) TK = (273 / t°C)
(iv) none of these
T K = (273 + t°C)

Question 24.
Calorimetry relates to the measurement of –
(i) heat
(ii) temperature
(iii) mechanical energy
(iv) none of these
heat

Question 25.
Quantity of heat of a body depends on its –
(i) temperature
(ii) mass
(iii) material of the body
(iv) all of them
all of them

Question 26.
Quantity of heat is given by –
(i) $$\frac{m s}{t}$$
(ii) mst
(iii) $$\frac{m t}{s}$$
(iv) $$\frac{m s t}{w}$$
mst

Question 27.
Work done W and heat produced H are related to each other as(where J is the mechanical equivalent of heat)
(i) WH = J
(ii) H = JW
(iii) W = J H
(iv) W J H = 1
W = JH

Question 28.
The value of mechanical equivalent of heat (in erg/calorie) is –
(i) 4.2 × 10-7
(ii) 4.2 × 107
(iii) $$\frac{1}{4.2}$$
4.2 × 107

Question 29.
The latent heat of fusion of ice is –
(i) 80 cal g-1
(ii) 3.36 × 105 cal g-1
(iii) 80 joule kg-1
(iv) 3.36 cal g-1
80 cal g-1

Question 30.
Saturated vapours obeys –
(i) Boyle’s law
(ii) Charles’ law
(iii) pressure law
(iv) none of these
none of these

Question 31.
Dews are formed at a temperature –
(i) greater than dew point
(ii) less than dew point
(iii) equal to dew point
(iv) at critical temperature.
equal to dew point

Question 32.
The volume of water is minimum at a temperature –
(i) -4°C
(ii) 4°C
(iii) 0°C
(iv) 1°C
4°C

Question 33.
Thermal capacity of a body of mass m and specific heat s is –
(i) $$\frac{\mathrm{m}}{\mathrm{s}}$$
(ii) $$\frac{\mathrm{m}}{\mathrm{s}}$$
(iii) $$\frac{\mathrm{m}}{\mathrm{s}}$$
(iv) ms
ms

Fill in the blanks :

1. Heat is the cause and temperature is the _____.
effect

2. Heat is a form of _____ a body possesses.
energy

3. The range of temperature between the upper and lower fixed point is known as _____ interval.
fundamental

4. Kelvin scale of temperature starts from the temperature corresponding to _____, taken as zero Kelvin.
-273° C

5. Mean calorie is _____ of the heat necessary to raise the temperature of 1 gram pure water from 0° C} to 100° C.
($$\frac{1}{100}$$) th

6. 1 calorie = 4.18 or approximately 4.2 _____.
joule

7. Specific heat of _____ in SI system is 4200 J/kg/K.
water

8. Thermal capacity or heat capacity of a body is defined as the ratio of the heat supplied to a body to its consequent rise in _____.
temperature.

9. In _____ process heat is transmitted in wave form.

10. In radiation process _____ is not required.
medium

11. Heat reaches the earth from the sun by _____ process.

12. Normal body temperature of a man is _____ degree celsius.
36.9

13. 94° F = _____ °C.
34.4

14. The water equivalent of a body is = mass x _____.
specific heat

15. A body becomes hot by _____ heat and becomes cold on giving away heat.
taking

16. Temperature is the condition of a body.
thermal

17. Melting point of _____ under normal atmospheric pressure is taken as the lower fixed point of a scale of temperature.
ice

18. The quantity of heat required to raise the _____ of unit mass of a substance through one degree is called the specific heat of the substance.
temperature

19. When work is completely converted into heat or heat is compietely converted into work, one is _____ to the other.
equivalent

20. Work done to produce unit heat is known as _____ equivalent of heat.
mechanical

21. Heat is a _____ quantity.
scalar

22. In CGS system the unit of specific heat is _____
Calorie/g/°C

23. The unit of specific heat in SI system is _____
J/kg/K

24. -40°C = _____ °F
-40

25. What is the dimension of heat ?
The dimension of heat is ML2 T-2.

26. 1°C = ______ °F
$$\frac{9}{5}$$

27. in CGS system heat is measured by the unit called _____.
Calorie

28. Temperature of a body depends on the _____ contained in it.
heat

29. In SI system the unit of thermal capacity is _____.
JK-1

30. 1 kcal = _____ cal
1000

31. In case of change of state, heat is _____ or liberated.
absorbed

32. Latent heat of fusion of ice is _____ Jkg-1
3.36 × 105

33. Specific heat of _____ is highest than any other common substance.