A is correct
Effect of Thermal Expansion &Contraction with their Applications in our Daily Life:
Which of the following substances expand on heating and contract on cooling?
a) solids
b) liquids
c) gases
d) all substances
Which of the following substance is used in thermometer?
a) iron
b) mercury
c) copper
d) gold
Explanation:Thermometer is the example of thermal expansion. Thermometer helps us to measure the amount of temperature or temperature gradient of a system.
Why it become easier to open a tight metal lid on heating?
a) metal lid expand on heating
b) metal lid contract on heating
c) metal lid expand on cooling
d) none of these
Why gaps in railway tracks are left?
a) it could contract in winter
b) it could expand in summer
c) both a and b
d) none of these
Why bridges are divided into small sections with expansion joints?
a) it could contract in winter
b) it could expand in summer
c) both a and b
d) none of these
I think :A
by at 2024-07-14 20:07:59