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Physics 9 Chapter 9 - Transfer of Heat - 3
1.
Which of the following are the examples of insulators?
a) Copper
b) Iron
c) Aluminium
d) Rubber
2.
What is the amount of heat that flows in unit time called?
a) Rate of flow of heat
b) Thermal conductivity
c) Flow of heat
d) Transfer of heat
3.
What is the formula for rate of flow of heat?
a) Rate of flow of heat = H / t
b) Rate of flow of heat = Q / t
c) Rate of flow of heat = H x t
d) Rate of flow of heat = Q x t
4.
What is the relation between rate of flow of heat and cross-sectional area?
a) Rate of flow of heat ∞ A
b) Rate of flow of heat ∞ A + t
c) Rate of flow of heat ∞ A / t
d) Rate of flow of heat ∞ 1 / A
5.
Rate of flow of heat is directly proportional to....................?
a) Temperature difference between ends of solid
b) Both b and c
c) Length of the solid
d) Cross-sectional area of a solid
6.
Rate of flow of heat is inversely proportional to....................?
a) None of these
b) Temperature difference between ends of solid
c) Length of the solid
d) Cross-sectional area of a solid
7.
What is the relation between rate of flow of heat and length of the solid?
a) Rate of flow of heat ∞ L
b) Rate of flow of heat ∞ L + t
c) Rate of flow of heat ∞ 1 / L
d) Rate of flow of heat ∞ L / t
8.
What is the relation between rate of flow of heat and temperature difference between ends of solid?
a) Rate of flow of heat ∞ (T
1
+ T
2
)
b) Rate of flow of heat ∞ (T
1
- T
2
)
c) Rate of flow of heat ∞ 1 / (T
1
- T
2
)
d) Rate of flow of heat ∞ 1 / (T
1
+ T
2
)
9.
What is the formula of rate of flow of heat?
a) Rate of flow of heat = k (T
1
- T
2
) / LA
b) Rate of flow of heat = A (T
1
- T
2
) / kL
c) Rate of flow of heat = kA (T
1
+ T
2
) / L
d) Rate of flow of heat = kA (T
1
- T
2
) / L
10.
In which of the following, heat flows rapidly?
a) Metals
b) Rubber
c) Cotton
d) Wood
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