Properties Of Matter Test

Result

Properties Of Matter Test - 3

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Question 1
1 / -0

In which mode of transmission do heat waves travel along a straight line with the speed of light?

A
Thermal radiation

B
Forced convection

C
Natural convection

D
Thermal convection

Solution

The energy emitted by a body in the form of radiation on account of its temperature is called thermal radiation. These radiations are heat radiations and travel along straight lines with the speed of light.
Question 2
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In the following question, a statement of assertion is given, followed by a corresponding statement of reason just below it. Mark the correct answer as

(a) if both assertion and reason are true, and the reason is the correct explanation of the assertion

(b) if both assertion and reason are true, but the reason is not the correct explanation of the assertion

(c) if assertion is true, but reason is false

(d) if both assertion and reason are false

Assertion: It is hotter over the top of fire than at the same distance on the sides.

Reason: Air surrounding the fire conducts more heat upwards.

A
a

B
b

C
c

D
d

Solution

Heat is transferred upwards due to convection and radiation, and sideways due to radiation. Convection occurs when heat is transferred through a gas or liquid by the hotter material moving into a cooler area. So, it is hotter over the top of the flame.
Question 3
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If the difference in temperature on the two sides of a wall increases from 100°C to 200°C, its thermal conductivity

A
remains unchanged

B
is doubled

C
becomes half

D
becomes four times

Solution

The coefficient of thermal conductivity of a material is the amount of heat flowing in 1 s through a rod of that material of 1 m length and 1m² area of cross-section in the steady state, when the difference of temperatures between the two ends of the rod is 1°C and the flow of heat is normal to the end faces of the rod. Coefficient of thermal conductivity K is a constant, whose value depends upon the material of the rod. Hence, even if temperature increases or decreases, its thermal conductivity remains unchanged.
Question 4
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In an isochoric process,

A
ΔW = 0

B
ΔU = 0

C
ΔQ = 0

D
ΔT = 0

Solution

Isochoric process takes place at constant volume.
We know that work done by a system is, W = P x ΔV, where P is pressure and ΔV the change in volume.
In an isochoric process, change in volume ΔV = 0, therefore, work done ΔW = 0.
While ΔQ = 0 is an adiabatic process, ΔU or ΔT = 0 in an isothermal process.
Question 5
1 / -0

A beaker is completely filled with water at 4°C. It will overflow if it is

A
heated above 4°C

B
cooled below 4°C

C
Both (1) and (2)

D
None of these

Solution

It will overflow if it is heated and cooled above and below 4°C, respectively because volume of water is minimum at 4^oC.