1.  Smooth glass

2.  Plaster

3.  Aluminium foil

4.  Concrete

4
Correct Answer :

Aluminium foil


Explanation :
No Explanation available for this question

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

4
Correct Answer :

To enable filament operation at reduced intensity for longer life


Explanation :
No Explanation available for this question

1.  Boiler furnaces

2.  Melting of ice

3.  Condensation of steam in condenser

4.  None of these

4
Correct Answer :

Boiler furnaces


Explanation :
No Explanation available for this question

1.  Conduction process

2.  Convection process

3.  Radiation process

4.  None of these

4
Correct Answer :

Radiation process


Explanation :
No Explanation available for this question

1.  Is black no colour

2.  Reflects all incident radiation

3.  Absorbs all incident radiation

4.  Transmit all incident radiation

4
Correct Answer :

Absorbs all incident radiation


Explanation :
No Explanation available for this question

1.  Black body

2.  White body

3.  Grey body

4.  Opaque body

4
Correct Answer :

White body


Explanation :
No Explanation available for this question

1.   Black body

2.  White body

3.  Grey body

4.  Transparent body

4
Correct Answer :

Transparent body


Explanation :
No Explanation available for this question

1.  Becomes good conductor of heat

2.  Shines

3.  Temperature increases

4.  All of these

4
Correct Answer :

Temperature increases


Explanation :
No Explanation available for this question

1.  Temperature of the body

2.  Material of the body

3.  Both (a) and (b)

4.  None of these

4
Correct Answer :

Temperature of the body


Explanation :
No Explanation available for this question

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