# illumination MCQ

Solve MCQ of illumination ,here given lots of unique mcq for you.It can be very help full for your electrical engineering exam or competitive exams.

### illumination MCQ

1. Radiant efficiency of the luminous source relies upon

(A) Shape of the source

(B) Temperature of the source

(C) Wavelength of light rays

(D) All of above.

2. Light waves travel with a velocity of

(A) 3 x 1010 cm/s

(B) 3 x 108 cm/s

(C) 3 x 1012 cm/s

(D) 3 x 1015 cm/s.

3. Carbon arc lamps are commonly used in

(A) domestic lighting

(B) street lighting

(C) cinema projectors

(D) photography.

4. The unit of solid angle is

(A) solid angle

(D) candela.

5. Candela is the unit of

(A) Luminous _flux

(B) Luminous intensity

(C) Wavelength

(D) None of the above

6. The unit of luminous _flux is

(B) candela

(C) lumen

(D) lux.

7. The illumination is comparative with the cosine of the angle made by the normal to the illuminated surface with the direction of incident flux. Above statement is related with

(A) Planck’s law

(B) Macbeth’s law of illumination

(C) Bunsen’s law of illumination

(D) Lambert’s cosine law.

8. One lumen per square meter is the equel to

(A) One lux

(B) One candela

(C) One-foot candle

(D) One lumen meter

9. Illumination level required for precision work is

(A) 50 lm/m2

(B) 100 lm/m2

(C) 200 lm/m2

(D) 500 lm/m2

10. Which of the following will need highest level of illumination?

(B) Bed rooms

(C) Hospital wards

(D) Railway platforms.