Thermal Properties of Matter Test

Result

Thermal Properties of Matter Test - 63

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Question 1
4 / -1

A heat flux of 4000 J/s is to be passed through a copper rod of length 10 cm and area of cross-section 100 cm². the thermal conductivity of copper is 400 W/m^oC. The two ends of this rod must be kept at a temperature difference of

A
1^oC

B
10^oC

C
100^oC

D
1000^oC

Solution
Question 2
4 / -1

On a cold morning, a metal surface will feel colder to touch than a wooden surface because

A
Metal has high specific heat

B
Metal has high thermal conductivity

C
Metal has low specific heat

D
Metal has low thermal conductivity
Question 3
4 / -1

In order that the heat flows from one pat of a solid to another part, what is required

A
Uniform density

B
Density gradient

C
Temperature gradient

D
Uniform temperature
Question 4
4 / -1

At a common temperature, a block of wood and a block of metal feel equally cold or hot. The temperature of block of wood and block of metal are

A
Equal to temperature of the body

B
Less than the temperature of the body

C
Greater than temperature of the body

D
Either (b) and (c)
Question 5
4 / -1

According to the experiment of Ingen Hausz the relation between the thermal conductivity of a metal rod is K and the length of the rod whenever the wax melts is

A
K/l = Constant

B
K²/l = constant

C
K/l² = constant

D
Kl = constant
Question 6
4 / -1

Temperature of water at the surface of lake is –20^oC. Then temperature of water just below the lower surface of ice layer is

A
–4^oC

B
0^oC

C
4^oC

D
–20^oC
Question 7
4 / -1

One end of a metal of length 1.0 m and area of cross–section 100 cm² is maintained at 100^oC, the quantity of heat transmitted through the rod per minute is (Coefficient of thermal conductivity of material of rod = 100W/m–K)

A
3 × 10³ J

B
6 × 10³ J

C
9 × 10³ J

D
12 × 10³ J

Solution
Question 8
4 / -1

The lengths and radii of two rods made of same material are in the ratios 1 : 2 and 2 : 3 respectively. if the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio

A
1 : 3

B
4 : 3

C
8 : 9

D
3 : 2

Solution
Question 9
4 / -1

A slab consists of two parallel layer of two different materials of same thickness having thermal conductivities K₁ and K₂. the equivalent conductivity of the combination is

A

B

C

D

Solution
Question 10
4 / -1

There are two identical vessels filled with equal amounts of ice. The vessels are of different metals. If the ice melts in the two vessels in 20 and 35 minutes respectively, the ratio of the coefficients of thermal conductivity of the two metals is

A
4 : 7

B
7 : 4

C
16 : 49

D
49 : 16

Solution