Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 56

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Weekly Quiz Competition

Question 1
4 / -1

2 kg of ice at 20^oC is mixed with 5 kg of water at 20^oC in an insulating vessel having a negligible heat capacity. Calculate the final mass of water remaining in the container. It is given that the specific heats of water and ice are 1 kcal/kg per ^oC and 0.5 kcal/kg/^oC while the latent heat of fusion of ice is 80 kcal/kg

A
7 kg

B
6 kg

C
4 kg

D
2 kg

Solution
Question 2
4 / -1

Water of volume 2 litres in a container is heated with a coil 1 kW at 27^oC . The lid of the container is open and energy dissipated=s at rate of 160 J/s. In how much time temperature will rise from 27^oC to 77^oC ? [Given specific heat of water is 4.2 kJ/kg]

A
8 min 20 s

B
6 min 2s

C
7 min

D
14 min

Solution
Question 3
4 / -1

A lead bullet at 27^oC just melts when stopped by an obstacle. Assuming that 25% of heat is absorbed by the obstacle, then the velocity of the bullet at the time of striking (M.P of lead = 327^oC , specific heat of lead = 0.03 cal/g^oC , latent heat of fusion of lead = 6 cal/g and J = 4.2 joule/cal)

A
410 m/s

B
1230 m/s

C
307.5 m/s

D
None of the above

Solution
Question 4
4 / -1

The temperature of equal masses of three different liquids A, B and C are 12^oC , 19^oC and 28^oC respectively. The temperature when A and B are mixed is 16^oC and when B and C are mixed is 23^oC . The temperature when A and C are mixed is

A
18.2^oC

B
22^oC

C
20^oC

D
25.2^oC

Solution
Question 5
4 / -1

In an industrial process, 10 kg os water per hour is to be heated from 20^oC to 80^oC . to so this, steam at 150^oC is passed from a boiler into a copper coil immersed in water. The steam condenses in the coil and is returned to the boiler as water at 90^oC . How many kg of steam is required per hour? (Specific heat of steam = 1 calorie per g^oC , Latent heat of vaporisation = 540 cal/g)

A
1 g

B
1 kg

C
10 g

D
10 kg

Solution
Question 6
4 / -1

In a vertical U-tube containing a liquid, the two arms are maintained at different temperatures t₁ and t₂. The liquid columns in the two arms have heights l₁ and l₂ respectively. The coefficient of volume expansion of the liquid is equal to

A

B

C

D

Solution
Question 7
4 / -1

The coefficient of linear expansion of crystal in one direction perpendicular is α₁ and that in every direction perpendicular to it is α₂. The coefficient of cubical expansion is

A
α₁ + α₂

B
2α₁ + α₂

C
α₁ + 2α₂

D
None of these

Solution
Question 8
4 / -1

Tree rods of equal length l are joined to from an equilateral ΔPQR. O is the mid point of PQ. Distance OR remains same for small change in temperature. Coefficient of linear expansion for PR and RQ is same, i.e., α₂ but that for PQ is α₁. Then

A
α₂ = 3α₁

B
α₂ = 4α₁

C
α₂ = 3α₁

D
α₂ = 4α₁

Solution
Question 9
4 / -1

10 g of ice at –20^oC is dropped into a calorimeter containing 10 g of water at 10^oC; the specific heat of water is twice that of ice. When equilibrium is reached, the calorimeter will contain

A
20 g of water

B
20 g of ice

C
10 g ice and 10 g water

D
5 g ice and 15 g water

Solution
Question 10
4 / -1

A rod of length 20 cm is made of metal. It expands by 0.075 cm when its temperature is raised from 0^oC to 100^oC. Another rod of a different metal B having the same length expands by 0.045 cm for the same change in temperature. A third rod of the same length is composed of two parts, one of metal A and the other of metal B. This rod expands by 0.060 cm for the same change in temperature. the portion made of metal A has the length

A
20 cm

B
10 cm

C
15 cm

D
18 cm

Solution