AIPMT Prelims Physics Thermal Properties of Matter Class 11 Questions

The total radiant energy per unit area, normal to the direction of incidence, received at a distance R from the centre of a star of radius r, whose outer surface radiates as a black body at a temperature T K is given by (Where σ is Stefan’s Constant)

A black body at 1227°C emits radiations with maximum intensity at a wavelength of 5000 Å. If the temperature of the body is increased by 1000°C, the maximum intensity will be observed at:

Which of the following circular rods, (given radius r and length l) each made of the same material and whose ends are maintained at the same temperature will conduct most heat?

The temperature of inversion of a thermocouple is 620°C and the neutral temperature is 300°C. What is the temperature of cold junction?

If λₘ denotes the wavelength at which the radioactive emission from a black body at a temperature T K is maximum, then :-

We consider the radiation emitted by the human body. Which of the following statements is true :

Consider a compound slab consisting of two different materials having equal thicknesses and thermal conductivities K and 2K, respectively. The equivalent thermal conductivity of the slab is -

A black body has wavelength λₘ corresponding to maximum energy at 2000 K. Its wavelength corresponding to maximum energy at 3000 K will be:

A cylindrical rod having temperature T₁ and T₂ at its end. The rate of flow of heat Q₁ cal/sec. If all the linear dimension are doubled keeping temperature remain const. then rate of flow of heat Q₂ will be : -

Gravitational force is required for: