1. 992
2. 812
3. 464
4. 567
812
1. Smooth glass
2. Plaster
3. Aluminium foil
4. Concrete
Aluminium foil
1. To get monochromatic light
2. To eliminate stray rays of right
3. To minimise reflection of rays from the lens surface
4. To enable filament operation at reduced intensity for longer life
To enable filament operation at reduced intensity for longer life
1. Boiler furnaces
2. Melting of ice
3. Condensation of steam in condenser
4. None of these
Boiler furnaces
1. Conduction process
2. Convection process
3. Radiation process
4. None of these
Radiation process
1. Is black no colour
2. Reflects all incident radiation
3. Absorbs all incident radiation
4. Transmit all incident radiation
Absorbs all incident radiation
1. Black body
2. White body
3. Grey body
4. Opaque body
White body
1. Black body
2. White body
3. Grey body
4. Transparent body
Transparent body
1. Becomes good conductor of heat
2. Shines
3. Temperature increases
4. All of these
Temperature increases
1. Temperature of the body
2. Material of the body
3. Both (a) and (b)
4. None of these
Temperature of the body