A composite rod made of copper and steel is heated. Then :
It bends with steel on concave side
It bends with copper on concave side
It does not expand
Data is insufficient
An ungraduated thermometer of uniform bore is attached to a centimetre scale and is found to read 10.3 cm in melting ice, 26.8 cm in boiling water and 6.5 cm. in freezing mixture. The temperature of the freezing mixture will be :
Two metallic spheres S1 and S2 are made of the same material and have got identical surface finish. The mass of S1 is thrice that of S2. Both spheres are heated to the same high temperature and placed in the same room having lower temperature . The ratio of the initial rate of cooling of S1 to that of S2 is :
The unit of Stefan's constant :
A copper block of mass 2.5 kg is heated in a furnace to a temperature of 500o C and then placed on a large ice block. The maximum amount of ice that can melt is :(sp.heat of Cu = 0.39 J/gm/o C and heat of diffusion of water = 335 J/gm)
The earth receives at its surface radiation from the sun at the rate of 1,400 Wm-2. The distance of the centre of the sun from the surface of the earthy is 1.5 x 1011 m and the radius of the sun is 70 x 108 m. Treating sun as a black body, it follows from the above data that its surface temperature is:
Temperature of a black body increases from 327oC to 927oC, the initial energy possessed is 2 kJ. What is its final energy ?
Which of the following has the highest specific heat ?
If boiling point of water is 95oF, what will be reading at Celsius scale ?
A radiation of energy E falls normally on a perfectly reflecting surface. The momentum transferred to the surface is :