Heat Test - 2...

A steel sphere of diameter 50 cm is resting on a circular ring made up of Brass of radius 24.8 cm. Both the measurements are at room temperature of 20°C. If the coefficient of linear expansion of Steel and Brass are 1.2 x 10^-5/°C and 1.8 x 10^-5/°C, then the temperature at which the sphere will fall down is

If two identical spheres of same radii R out of which one is hollow containing air and the other is solid are heated through the same temperature range, then the change in dimensions of the spheres will be

A glass vessel of volume 600 cu cm at 20°C contains certain amount of Mercury. The amount of Mercury that it should contain at 20°C such that the empty space in the container is same for at all temperatures is [Coefficient of linear expansion of glass is 0.8 x 10^-5/°C and the coefficient of cubical expansion of Mercury is 18 x 10^-5/°C]

A cubic crystal of dimension 3 x 10^-12 m at 293 K, has coefficient of linear expansion along its length as 13 x 10^-7 /°C but along breadth and height it has the coefficient of linear expansion of 231 x 10^-7 /°C. If temperature of the crystal is increased to 393 K, then the change in volume is

The door of a running refrigerator inside a closed room was left open. Which of the following observations will be seen?

Mercury is filled in a glass flask of volume 500 cu cm at 0°C. The coefficient of cubical expansion of mercury is 182 ´ l0^-6 /°C and that of glass is 30 ´ l0^-6 /°C. If the temperature of the flask is increased to 100°C, then the amount of Mercury that has over flown out is