Q. A cylinder of radius made of material of thermal conductivity is surrounded by a cylindrical shell of inner radius and outer radius made of a material of thermal conductivity . The two ends of the combined system are maintained at two different temperatures. What is the effective thermal conductivity of the system ?

Thermal Properties of Matter Report Error

A

B

C

D

Solution:

As we use

Questions from Thermal Properties of Matter

1. If the temperature difference on the two sides of a wall increases from to , its thermal conductivity

Rajasthan PMT 2007

2. A wall is made of equally thick layers and of different materials. Thermal conductivity of is twice that of . In the steady state, the temperature difference across the wall is . The temperature difference across the layer is

3. The radiation emitted by a star is times that of the sun. If the surface temperatures of the sun and the star are and respectively. The ratio of the radii of the star and the sun is

NTA Abhyas 2020

4. A black body at emits maximum energy corresponding to a wavelength of microns. The temperature of the moon for which micron would be

NTA Abhyas 2020

5. Three rods made from the same material and having the same cross-sectional area, form the sides of an isosceles triangle , right-angled at . The points and are maintained at temperature and , respectively. In steady-state, the temperature of the point is . Assuming that only heat conduction takes place along the lengths of the rods, the value of is

NTA Abhyas 2020

Physics Most Viewed Questions

1. If and respectively denote energy and gravitational constant, then has the dimensions of:

NEET 2021 Physical World, Units and Measurements

2. The de Broglie wavelength of an electron moving with kinetic energy of is nearly

NEET 2020 Dual Nature of Radiation and Matter

3. A car starts from rest and accelerates at At , a ball is dropped out of a window by a person sitting in the car. What is the velocity and acceleration of the ball at ? (Take

NEET 2021 Motion in a Straight Line

4. A wheel with metallic spokes each long is rotated with a speed of in a plane perpendicular to a magnetic field of . The induced emf between the axle and rim of the wheel will be,

NEET 2020 Electromagnetic Induction

5. A barometer is constructed using a liquid (density What would be the height of the liquid column, when a mercury barometer reads ?
(density of mercury

NEET 2020 Mechanical Properties of Fluids

Latest Updates