WBBSE Class 10 Physical Science MCQ Questions Chapter 4 Thermal Phenomena

Well structured WBBSE Class 10 Physical Science MCQ Questions Chapter 4 Thermal Phenomena can serve as a valuable review tool before exams.

Thermal Phenomena Class 10 WBBSE MCQ Questions

Multiple choice questions (MCQ) :

Question 1
The Fahrenheit and kelvin scales of temperature will the same reading at
(A) -40
(B) 313
(C) 574.25
(D) 732.25
(B) 5 ?

Question 2
At what temperature, volume of an ideal gas at 0°C becomes triple?
(A) 182°C
(B) 819°C
(C) 546°C
(D) 646°C
(C) 546°C

Question 3.
The specific heat of ice at 0°C melting into at 0°C is:
(A) zero
(B) infinity
C) more than zero
(D) less than zero
(B) infinity

Question 4.
Boiling water is changing into steam. The specific heat of boiling water is:
(A) Zero
(B) One
(C) infinity
(D) less than one
(C) infinity

Question 5.
Which of the following has the highest specific heat?
(A) copper
(B) water
(C) hydrogen
(D) silver
(C) hydrogen

Question 6.
One gram of ice at 0°C is added at 5 g of water to 10°C. Final temperature of the mixture is:
(A) -5°C
(B) 5°C
(C) 0°C
(D) none of these
(A) -5°C

Question 7.
The specific heat of an ideal gas varies with temperature T as :
(A) T1
(B) T2
(C) T-1
(D) T0
(D) T0

Question 8.
22 g CO2 at 27°C is mixed with 16 g of oxygen at 37°C. The temperature of the mixture is :
(A) 32°C
(B) 27°C
(C) 37°C
(D) 30°C
(A) 32°C

Question 9.
A ballon contains 500 m3 of He at 27°C and 1 atmospheric pressure. The volume of He at -3°C and 0.5 atmospheric pressure will be:
(A) 700 m3
(B) 900 m3
(C) 1000 m3
(D) 500 m3
(B) 900 m3

Question 10.
The specific heat of a gas in a gas in an isothermal process is:
(A) infinite
(B) zero
(C) negative
(D) remains constant
(A) infinite

Question 11.
100 g of ice is mixed with 100 g of water at 100°C. The final temperature of the mixture is:
(A) 10°C
(B) 20°C
(C) 40°C
(D) 30°C
(A) 10°C

Question 12.
Heat given to a body which rises its temperature by 1°C is:
A water equivalent
(B) specific heat
(C) thermal capacity
(C) thermal capacity

Question 13.
During the adiabatic process, the pressure of a gas is found to be proportional to the cube of its absolute temperature.
The ratio $$\fracC_p}C_v}$$ for gas is :
(A) $$\frac{4}3}$$
(B) 2
(C) $$\frac{5}3}$$
(D) $$\frac{3}2}$$
(D)

Question 14.
A gaseous mixture consists of 16 g of Helium and 16 g Oxygen. The ratio $$\fracC_p}C_v}$$ of the mixture is :
(A) 1.54
(B) 1.4
(C) 1.63
(D) 1.59
(C) 1.63

Question 15
Two bars of copper having same length but unequal cross-section are heated to the same temperature. The change in length will be:
(A) equal in both bars
(B) more in thicker bar
(C) more in thinner bar
(D) cannot say
(A) equal in both bars

Question 16
A body cools from 60°C to 50°C in 10 min. If room temperature be 25°C, temperature of the body at the end of next 10 min will be:
(A) 38.5°C
(B) 40°C
(C) 45°C
(D) 42.85°C
(D) 42.85°C

Question 17
A body takes T minutes is cool from 62°C to 61°C when the surrounding temperature is 30°C. The time taken by the body to cool is 30°C. The time taken by the body to cool 46°C to 45°C is
(A) greater than T minute
(B) equal to T minute
(C) less than T minute
(D) equal to T/2
(A) greater than T minute

Question 18
If the temperature of a block body is doubled, the wavelength at which the spectral radiancy has its maximum is :
(A) doubled
(B) halved
(D) unchanged
(B) halved

Question 19
A black body has maximum wavelength 1 m at 2000 K. Its corresponding wavelength at 3000 K will be :
(A) $$\frac{3}{2}$$ λ m
(B) $$\frac{2}{3}$$ λ m
(C) $$\frac{16}{81}$$ λ m
(D) $$\frac{81}{16}$$ λ m
(B) $$\frac{2}{3}$$ λ m

Question 20.
A body cools from 50°C to 40°C in 5 minutes. Its temperature comes down to 33.33°C in next 5 minutes. The temperature of surrounding is:
(A) 15°C
(B) 20°C
(C) 25°C
(D) 10°C
(B) 20°C

Question 21
The rate of cooling at 600 K, if surrounding temperature is 300 K is R. The rate of cooling at 900 K is :
(A) $$\frac{16}{3}$$ R
(B) 2 R
(C) 3 R
(D) $$\frac{2}{3}$$ R
(A) $$\frac{16}{3}$$ R

Question 22
If Im denotes the wavelength at which the radiative emission from a black body at a temperature TK is maximum, then
(A) λm ∝ T
(B) λm ∝ T-1
(C) λm ∝ T2
(D) λm does not depend on T.
(B) λm ∝ T-1

Question 23
Two spheres made of same material have radii in the ratio 1 : 2. Both are at same temperature. Ratio of heat radiation energy emitted per second by them is:
(A) 1 : 2
(B) 1 : 4
(C) 1 : 8
(D) 1 : 16
(B) 1 : 4

Question 24.
The coefficient of linear expansion of a solid is :
(A) 3 γ
(B) 2 γ
(C) γ
(D) γ / 3
(D) γ / 3

Question 25.
A good insulator of heat is
(A) Copper
(B) Mercury
(C) trapped air
(D) Iron
(C) tropped air

Question 26.
A bimetallic strip bends on heating due to :
(A) Uneven expansions
(B) Same expansion
(C) No expansions
(D) None of these
(A) Uneven expansions

Question 27.
The coefficient of linear expansion of a solid depends on :
(A) unit of length
(B) scale of temperature
(C) density of the material
(D) None of these
(B) scale of temperature

Question 28.
A bimetallic strip bends upon heating because of
(A) same expansion
(B) uneven expansion
(C) no expansion
(D) twisting
(B) uneven expansion

Question 29.
If the value of coefficient of linear expansion is 1.5 × 10-4 ° C-1 then value of coefficient of superficial expansion is :
(A) 4.5 × 10-4 °C-1
(B) 3.0 × 10-4 ° C-1
(C) 6.0 × 10-4 ° C-1
(D) 7.5 × 10-4 ° C-1
(B) 3.0 × 10-4 ° C-1

Question 30.
When a solid metallic sphere is heated, the largest percentage increase occurs in its.
(A) Diameter
(B) Surface area
(C) Volume
(D) Density
(C) Volume

Question 31.
For a liquid, the coefficient of apparent expansion (δa) and coefficient of real expansion (γ) are related as :
(A) δa = γr
(B) γa > γru
(C) γa < γr
(D) γa / γr = constant
(C) γa < γr

Question 32.
Coefficient of linear expansion of the following metals are in the order
(A) aluminium < copper < iron
(B) copper < iron < aluminium
(C) copper < aluminium < iron
(D) aluminium > copper > iron
(D) aluminium > copper > iron

Question 33.
The thermal conductivity of a rod is 2. what is its resistivity?
(A) 0.5
(B) 1
(C) 0.25
(D) 2
(A) 0.5

Question 34.
Thermal conductivity of which of the following is the maximum?
(A) copper
(B) silver
(C) diamond
(D) platinum
(C) diamond

Question 35.
The magnitude of thermal conductivity of the following substances are in the order.
(A) silver > aluminium > glass > wood
(B) aluminium > silver > glass > wood
(C) silver > aluminium > wood > glass
(D) aluminium > silver > wood > glass
(A) silver > aluminium > glass > wood

Question 36.
A liquid which is a good conductor of heat is :
(A) kerosin
(B) mercury
(C) water
(D) turpentine
(B) mercury

Question 37.
For an ideal heat insulator, value of K is :
(A) zero
(B) 1
(C) 100
(D) α
(A) zero

Fill in the blanks :

1. Heat is a form of _________.
energy.

2. Three different types of motions are translational motion, vibrational motion and ___________.
Rotational motion.

3. SI unit of heat is __________.
Joule.

4. 1 calorie = __________ Jule.
4.18

5. Temperatures are measured with a __________.
thermometer.

6. ______ is the upper fixed point in Fahrenheit scale.
212° F

7. Three types of expansions in solids are, linear expansion, superficial expansion and __________.
volume expansion.

8. Real expansion of the liquid = expansion of the vessel + __________.
apparent expansion of the liquid.

9. γs = γn + ________.
γ8

10. The volume of water is minimum at ______.
4°C

11. The density of water is maximum at ______.
4°C.

12. From Charle’s Law, we find γp = ______ °C-1.
$$\frac{1}{273}$$

13. From pressure law, we find γy= ________ °C-1.
$$\frac{1}{273}$$

14. Specific heat of water in SI system is ________.
4200 Jkg-1 K-1.

15. The unit of thermal conductivity in SI system is ________.
Jm-1 s-1 K-1.

16. The unit of thermal conductivity in CGS system is ________.
cm2 s-1

17. Carbon dioxide is a ________ gas.
green house.

18. The expansion of a substance on heating is called ________ expansion.
thermal.

19. The coefficient of linear expansion of a solid does not depend on unit of ________.
length.

20. Thermal resistivity is the _______ of thermal conductivity.
reciprocal.

21. In charles’ law, a _______ mass of gas is taken.
given.

22. A liquid good conductor of heat is ________.
mercury.

23. In summer the pendulum clock becomes ________.
slower

24. The unit of γ (i.e, coefficlent of cubical expansion) in S.I unit is ________.
K-1

25. Material of the rod remaining same, longer the rod, ________ will be the increase in length of the rod for same increase in temperature.
more.

26. If the value of α is 24 × 10-6 °C-1, then its value in S.I. unit is ________.
24 × 10-6 K-1

27. Unit of β (coefficient of superficial expansion) is ________.
°C-1 or K-1

28. For a particular solid substance, magnitude of β has the value of α [symbols have their usual meaning].
twice

29. For two rods of same length and same area of cross-section, if temperature is raised by same amount, iron rod will expand ______ compared to that of the aluminium rod.
less

30. The reciprocal of thermal conductivity is known as ________.
thermal resistivity.

31. The S.I unit of thermal conductivity is ________.
jm-1.k-1.s-1

32. Diamond has ________ value of K (i.e., coefficient of thermal conduction) than copper.
higher

33. Brass is a ________ conductor of heat.
good

34. In solids, heat passes from hotter region to colder region by ________ processes.
conduction

State whether the following statement is True or False : VSA

1. In winter the pendulum clock becomes slower.
False

2. β (i.e. coefficient of superficial expansion) is the characteristic of the material.
True

3. For an ideal gas, (δ i.e., coefficient of cubical expansion) = 1 / 273
True

4. α, β and δ are related as follows α : β : δ = 1 : 2 : 3
[Symbols have their usual meaning]
True

5. Real expansion of the liquid = Apparent expansion of the liquid+volume expansion of the container.
True

6. The seasonal changes in a pendulum clock are due to the expansion or contraction of solid substances.
True

7. The S.I. unit of thermal conductivity is jm-2 ks-1
False

8. Usually metals are good conductors of heat than gases and nonmetals.