Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 81

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Weekly Quiz Competition

Question 1
4 / -1

Four rods of silver, copper, brass and wood are of same shape. They are heated together after wrapping a paper on it, the paper will burn first on

A
Silve

B
Copper

C
Brass

D
Wood
Question 2
4 / -1

The two opposite faces of a cubical piece of iron (thermal conductivity = (12 C.G.S. units) are at 100°C and 0^oC in ice. If the area of a surface is 4 cm² then the mass of ice melted in 10 minutes will be

A
30 g

B
300 g

C
5 g

D
50 g

Solution
Question 3
4 / -1

Wien’s constant is 2892 x 10^-6 M.K.S. unit and the value of λ_m from moon is 14.46 microns. What is the surface temperature of moon?

A
100 K

B
300 K

C
400 K

D
200 K

Solution
Question 4
4 / -1

Two friends A and B are waiting for another friend for tea. A took tea in a cup and mixed the cold milk and then waits. B took the tea in the cup and then mixed the cold milk when the friend comes. Then, the tea will be hotter in the cup of

A
A

B
B

C
Tea will be equally hot in both cups

D
Friend's cup
Question 5
4 / -1

There are two spherical balls A and B of the same material with same surface, but the diameter of A is half that of H. If A and B arc heated to the same temperature and then allowed to cool, then

A
Rate of cooling is same in both

B
Rate of cooling of A is four times that of B

C
Race of cooling of A is twice that o B

D
Rate of cooling of A is 1/4 times that of B

Solution
Question 6
4 / -1

Five identical rods are joined as shown in figure. Point A and C are maintained at temperature 120°C and 2O^oC respectively. The temperature of j unction B will be

A
100^oC

B
80^oC

C
70^oC

D
0^oC

Solution
Question 7
4 / -1

A body takes T minutes to cool from 62C to 61 C when the surrounding temperature is 3O^oC. The time taken by the body to cool from 46t to 45.5°C is

A
Greater than T minutes

B
Equal to T minutes

C
Less than T minutes

D
Equal to 172 minutes

Solution
Question 8
4 / -1

Can we boil water inside the earth satellite by convection

A
Yes

B
No

C
Nothing can be said

D
In complete information is given
Question 9
4 / -1

Two conducting rods A and B of same length and cross- sectional area are connected (i) In series (ii) In parallel as shown. In both combination a temperature difference of 100^oC is maintained. If thermal conductivity of A is 3K and that of B is K, then the ratio of heat current flowing in parallel combination to that flowing in series combination is

A
16/3

B
3/16

C
1/1

D
1/3

Solution
Question 10
4 / -1

In the following figure, two insulating sheets with thermal resistances R and 3R as shown in figure. The temperature θ is

A
20^oC

B
60^oC

C
75^oC

D
80^oC

Solution