Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 64

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Question 1
4 / -1

Surface of the lake is at 2^oC. Find the temperature of the bottom of the lake

A
2^oC

B
3^oC

C
4^oC

D
1^oC
Question 2
4 / -1

The heat is flowing through a rod of length 50 cm and are of cross-section 5 cm². Its ends are respectively at 25^oC and 125^oC. The coefficient of thermal conductivity of the material of the rod is 0.0092 kcal/m × s × ^oC. The temperature gradient in the rod is

A
2^oC/cm

B
2^oC/m

C
20^oC/cm

D
20^oC/m

Solution
Question 3
4 / -1

In the Ingen Hauz\'s experiment the wax melts up to lengths 10 and 25 cm on two identical rods of different materials. The ratio of thermal conductivities of the two materials is

A
1 : 6.25

B
6.25 : 1

C
1 : √2.5

D
1 : 2.5

Solution
Question 4
4 / -1

Heat current is maximum in which of the following (rods are of identical dimension)?

A

B

C

D
Question 5
4 / -1

Two rods of same length and cross-section are joined along the length. Thermal conductivities of first and second rod are K₁ and K₂. The temperature of the free ends of the first and second rods are maintained at θ₁ and θ₂ respectively. The temperature of the common junction is

A

B

C

D

Solution
Question 6
4 / -1

The freezer in a refrigerator is located at the top section so that

A
The entire of the refrigerator is cooled quickly due to convection

B
The motor is not heated

C
the heat gained from the environment is high

D
The heat gained from the environment is low
Question 7
4 / -1

While measuring the thermal conductivity of a liquid, we keep the upper part hot and lower part cool, so that

A
Convection may be stopped

B
Radiation may be stopped

C
Heat conduction is easier downwards

D
It is easier and more convenient to so so
Question 8
4 / -1

For proper ventilation of building, windows must be open near the bottom and top of the walls so as to let pass

A
In more air

B
In cool air near the bottom and hot air out near he proof

C
In hot air near the roof and cool air out near the bottom

D
Out hot air near the roof
Question 9
4 / -1

Mode of transmission of heat, in which heat is carried by the moving particles, is

A
Radiation

B
Conduction

C
Convection

D
Wave motion

Solution
Question 10
4 / -1

When fluids are heated fro the bottom, convection currents are produced because

A
Molecular motion of fluid becomes aligned

B
Molecular collisions take place within the fluid

C
heated fluid becomes more dense than the cold fluid above it

D
heated fluid becomes less dense than the cold fluid above it