A steel rail road track has a length of 30m when the temperature is 20oC. What is its length on a hot day when the temperature is 46oC?(α = 11 × 10-6/k)
30.00825 cm
50cm
50.0036 cm
40.12 cm
In vacuum heat is transferred only by the process of
conduction
convection
radiation
both 1 and 3
Railway tracks are made up of
Cobalt
Nickel
Chromium
Steel
Real expansion is associated with which of the following substance ?
Liquid
Gas
Solid
Plasma
A good insulator of heat is
Cu
Mercury
Trapped air
Iron
The unit of coefficient of linear expansion is
m
moc-1
oc
oc-1
Which quantity determines the direction of flow of heat on keeping the two bodies in contact ?
Temperature
Heat
Internal energy
Kinetic energy
From the following which one is correct ?
Which of the graph shows the anomalous expansion of water ?
Which is the following is a good source of heat radiation?
Black body
White body
Transparent body
Both 1 and 2
