illumonation mcq

 

1. The band of seven colors is called

A) spectrum
B) dispersion
C) radiation
D) none of these

ANSWER= (A) spectrum
Explain:- The band of seven colors is called spectrum

 

2. Which of the following colour has lowest wavelength

A) red
B) indigo
C) violet
D) green

ANSWER= (C) violet

 

3. The metric unit of illumination is

A)lux
B) lumen
C) candle
D) lumen/watt

ANSWER= (A) lux

 

4. The unit of luminous flux is

A) candle power
B)lumen
C) lux
D) metre candle

ANSWER= (B) lumen
Explain:-

 

5. HPMV lamp gives

A) 30 lumens/w
B) 50 lumens/w
C) 60 lumens/w
D) 80 lumens/w

ANSWER= (B) 50 lumens/w

 

6. In running condition of fluorescent lamp, voltage across starter is

A) 110v
B) 180v
C) 220v
D) 0

ANSWER= (A) 110v