Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 8

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Question 1
4 / -1

A copper block of mass 4 kg is heated in a furnance to a temperature 425°C and then placed on a large ice block. The mass of ice that will melt in this process will be (specific heat of copper = 500 J kg^-1°C ^-1 and heat of fusion of ice = 336 kJ kg ^-1)

A
0.5 kg

B
1 kg

C
1.5 kg

D
2.5 kg
Question 2
4 / -1

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

A

B

C

D
Question 3
4 / -1

The sprinkling of water reduces slightly the temperature of a closed room, because

A
temperature of water is less than that of the room

B
specific heat of water is high

C
water has large latent heat of vaporisation

D
water is a bad conductor of heat
Question 4
4 / -1

Calorie is defined as the amount of heat required to raise temperature of 1 g of water by 1°C and it is defined under which of the following conditions?

A
From 14.5°C to 15.5°C at 760 mm of Hg

B
From 98.5°C to 99.5°C at 760 mm of Hg

C
From 13.5°C to 14.5°C at 76 mm of Hg

D
From 3.5°C to 4.5°C at 76 mm of Hg
Question 5
4 / -1

A vessel contains 110 g of water. The heat capacity of the vessel is equal to 10 g of water.The initial temperature of water in vessel in 10°C.If 220 g of hot water at 70°C is poured in the vessel, the fmal temperature neglecting radiation loss will be

A
70°C

B
80°C

C
60°C

D
50°C
Question 6
4 / -1

Three rods of copper, brass and steel are welded together to from a Y-shaped structure. Area of cross-section of each rod is 4 cm². End of copper rod is maintained at 100°C whereas ends of brass and steel are kept at 0°C. Lengths of the copper, brass and steel rods are 46 cm, 13 cm and 12 cm respectively. The rods are thermally insulated from surroundings except at ends. Thermal conductivities of copper, brass and steel are 0.92, 0.26 and 0.12 in CGS units, respectively. Rate of heat flow through copper rod is

A
1.2 cal/s

B
2.4 cal/s

C
5.52 cal/s

D
6.0 cal/s
Question 7
4 / -1

Two rods (one semicircular and other straight) of same material and of same cross-sectional area are joined as shown in the figure. The points A and B are maintained at different temperature. The ratio of a semicircular rod to the heat transferred through a cross-section of a semicircular rod to the heat transferred through a cross-section of the straight rod in a given time is

A
2 : π

B
1 : 2

C
π : 2

D
3 : 2
Question 8
4 / -1

Two rectangular blocks, having identical dimensions, can be arranged either in configuration I or in configuration II as shown in the figure. One of the blocks has thermal conductivity K and the other 2K. The temperature difference between the ends along the X-axis is the same in both the configurations. It takes 9s to transport a certain amount of heat from the hot end to the cold end in the configuration I. The time to transport the same amount of heat in the configuration II is

A
2.0 s

B
3.0 s

C
4.5 s

D
6.0 s
Question 9
4 / -1

The figure shows the temperatures at four faces of a composite slab consisting of four materials S₁ ,S₂ , S₃ and S₄ of identical thickness, through which the heat transfer is steady. Arrange the materials according to their thermal conductivities in decreasing order.

A
S₂, S₄, S₁ , S₃

B
S₂ = S₄, S₁ , S₃

C
S₁ = S₂ , S₃, S₄

D
S₁ ,S₂, S₃, S₄
Question 10
4 / -1

Three rods of same dimensions are arranged as shown in figure, they have thermal conductivities K₁ , K₂ and K₃. The points P and Q are maintained at different temperatures for the heat to flow at the same rate along PRQ and PQ.

A

B

C

D