1. Which appears gray to the eye
2. Whose emissivity is independent of wavelength?
3. Which has reflectivity equal to zero?
4. Which appears equally bright from all directions?
Whose emissivity is independent of wavelength?
1. k1 > k2
2. k1 = k2
3. k1 = 0
4. k1 < k2
k1 < k2
1. Increasing the thermal conductivity of the outer layer
2. Increasing the thermal conductivity of the inner layer
3. Increasing the thickness of the outer layer
4. Reducing the thickness of the inner layer
Increasing the thermal conductivity of the outer layer
1. Heat transfer rate increases
2. Heat transfer rate decreases
3. Heat transfer rate remains constant
4. None of these
Heat transfer rate decreases
1. T-1
2. θ-1
3. MLTθ
4. None of these
θ-1
1. P will be in tension and Q in compression
2. Both P and Q will be in compression
3. P will be in compression and Q in tension
4. Both P and Q will be in tension
P will be in compression and Q in tension
1. k/h
2. k/4πh
3. h/2k
4. 2k/h
2k/h
1. 300C
2. 500C
3. 600C
4. 700C
700C
1. Clinical thermometer
2. Alcohol filled thermometer
3. Optical pyrometers
4. Nitrogen filled thermometer
Clinical thermometer
1. Conduction
2. Convection
3. Radiation
4. All of these
Conduction