## Photometry-MCQ-Basic

Physics is an important subject in preparation for various Competitive exams.To keep a track of your preparation we have designed a small quiz of 10 Basic Level Questions on Photometry. You have 10 minutes to solve the quiz, click the start timer button in order to start the timer and then click on submit button at the end to submit the quiz and view your scores and correct answers.

Q1. "Lux" is a unit of

•  Luminous intensity of a source
•  Illuminance on a surface
•  Transmission coefficient of a surface
•  Luminous efficiency of source of light

Illuminance on a surface

Q2. If the luminous intensity of a 100 W unidirectional bulb is 100 candela, then total luminous flux emitted from the bulb is

•  861 lumen
•  986 lumen
•  1256 lumen
•  1561 lumen

1256 lumen

Q3. The maximum illumination on a screen at a distance of 2 m from a lamp is 25 lux. The value of total luminous flux emitted by the lamp is

•  1256 lumen
•  1600 lumen
•  100 candela
•  400 lumen

1256 lumen

Q4. A small lamp is hung at a height of 8 feet above the centre of a round table of diameter 16 feet. The ratio of intensities of illumination at the centre and at points on the circumference of the table will be

•  1 : 1
•  2 : 1
•  2√2 : 1
•  3 : 2

2√2 : 1

Q5. Lux is equal to

•  1 lumen/m 2
•  1 lumen/cm 2
•  1 candela/m 2
•  1 candela/cm 2

1 lumen/m 2

Q6. Five lumen/watt is the luminous efficiency of a lamp and its luminous intensity is 35 candela. The power of the lamp is

•  80 W
•  176 W
•  88 W
•  36 W

88 W

Q7. The distance between a point source of light and a screen which is 60 cm is increased to 180 cm. The intensity on the screen as compared with the original intensity will be

•  (1 / 9) times
•  (1 / 3) times
•  3 times
•  9 times

(1 / 9) times

Q8. A source of light emits a continuous stream of light energy which falls on a given area. Luminous intensity is defined as

•  Luminous energy emitted by the source per second
•  Luminous flux emitted by source per unit solid angle
•  Luminous flux falling per unit area of a given surface
•  Luminous flux coming per unit area of an illuminated surface

Luminous flux emitted by source per unit solid angle

Q9. Venus looks brighter than other stars because

•  It has higher density than other stars
•  It is closer to the earth than other stars
•  It has no atmosphere
•  Atomic fission takes place on its surface

It is closer to the earth than other stars

Q10. To prepare a print the time taken is 5 sec due to lamp of 60 watt at 0.25 m distance. If the distance is increased to 40 cm then what is the time taken to prepare the similar print

•  3.1 sec
•  1 sec
•  12.8 sec
•  16 sec

12.8 sec

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