Photometry MCQ Questions and Answers

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Photometry MCQ Questions and Answers. We covered all the Photometry MCQ Questions and Answers in this post so that you can practice well for the exam.

We also covered some other related topics like light and heat MCQ on our website. The respective links of those posts are provided in the related posts section below.

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MCQ on Photometry for School Students

The luminous flux cannot be measured visually in

1. Ergs/ second

2. Lumen

3. Lumen/watt

4. None of these

Option 1 – Ergs/ second

The luminous flux or illuminating power cannot be measured visually in ergs/second Because of

1. The variations of the sensitivity of human eye to different colours of light

2. The constant in the sensitivity of human eye to different colours of light

3. The variations of the sensitivity of human eye to same colour of light

4. None of these

Option 1 – The variations of the sensitivity of human eye to different colours of light

When normal lines are drawn from the boundary of a portion on the surface of a sphere such that the lines meet at its centre and form a cone, then the angle enclosed by the conical surface is defined as

1. The angle in a semi circle

2. The angle in a major segment

3. Solid angle

4. The angle in a minor segment

Option 3 – Solid angle

The solid angle is equal to the

1. Ratio of the area of the base of conical surface to the square of the radius of the sphere

2. Sum of the area of the base of conical surface and the square of the radius of the sphere

3. Difference of the area of the base of conical surface to the square of the radius of the sphere.

4. None of these

Option 1 – Ratio of the area of the base of conical surface to the square of the radius of the sphere

The light from a point source, like a candle flame, travels in the form of

1. Cylindrical wave fronts

2. Spherical wave fronts

3. Plane wave fronts

4. None of these

Option 2 – Spherical wave fronts

Solid angle is measured in

1. Radians

2. Steradians

3. Degrees

4. Minutes

Option 2 – Steradians

The solid angle made at the centre(s) of a sphere of radius 1 unit by an areas (A) of 1 sq. unit on its surface, is

1. 1 steradian

2. 2 steradians

3. 3 steradians

4. 4 steradians

Option 1 – 1 steradian

The intensity of a light source that can be judged by human eye, is

1. Luminosity

2. Luminous intensity

3. Illuminating power

4. 2 and 3

Option 4 – 2 and 3

The Luminous flux emitted from a point source of light through unit solid angle, is

1. Luminous intensity

2. Illuminating power

3. Luminosity

4. 1 and 2

Option 4 – 1 and 2

The unit of luminous intensity ‘or’ illuminating power is

1. Lumen

2. Candela

3. Lumen/watt

4. None of these

Option 2 – Candela

The S.I. unit of luminous intensity is

1. Candela

2. Lumen

3. Lumen/watt

4. Erg/sec

Option 1 – Candela

A black-body is a perfect

1. Emitter

2. Absorber

3. Both of these

4. None of these

Option 3 – Both of these

The luminous flux emitted per unit solid angle along normal to the surface by one sixtieth () square-cm area of a black-body radiator is defined as

1. Lumen

2. Ergs/sec

3. Candela

4. Lumen/watt

Option 3 – Candela

The luminous flux of a light source is measured in the units of

1. Lumen

2. Candela

3. Lumen/watt

4. Ergs/sec

Option 1 – Lumen

The amount of light energy emitted per second by a uniform source of one candela within a cone of unit solid angle is

1. Candela

2. Lumen

3. Ergs/sec

4. Luminosity

Option 2 – Lumen

Which of the following is constant for given a light source?

1. Luminous intensity

2. Luminosity

3. Luminous

4. All of these

Option 1 – Luminous intensity

Which of the following is not measured visually in ergs per second

1. Luminous flux

2. Luminous intensity

3. Luminosity

4. 1 and 2

Option 4 – 1 and 2

Light is a/an

1. At rest

2. Energy on the flow

3. Material that flow

4. Material at rest

Option 2 – Energy on the flow

Light is emanated from

1. Non-luminous bodies

2. Self luminous bodies

3. Any body

4. All of these

Option 2 – Self luminous bodies

The radiant energy which causes sensation of vision of the retina of human eye, is called

1. Light

2. Sound

3. Heat

4. Electricity

Option 1 – Light

The term ‘light’, includes the…..of electromagnetic energy spectrum

1. Infrared region

2. Visible region

3. Ultra violet region

4. None of these

Option 2 – Visible region

A source of light may emit radiant energy from region of the spectrum. …….

1. Visible

2. Infrared

3. Violet

4. All of these

Option 4 – All of these

Which of the following of a light source represents the degree to which visible light is present in the radiant energy emitted by the source?

1. Brightness

2. Luminous intensity

3. (1) and (2)

4. None of these

Option 3 – (1) and (2)

The amount of radiant energy flowing from a source of light per unit time, is

1. Luminosity

2. Luminous flux

3. Luminous intensity

4. None of these

Option 3 – Luminous intensity

The science with which the relative luminous intensities of light emitted by two sources of light are determined, is :

1. Photometry

2. Visible spectroscopy

3. Visile Photometry

4. All of these

Option 3 – Visile Photometry

The science of measuring brightness or relative luminous intensities of light emitted by different sources using certain standards and techniques

1. Visible spectrum

2. Photometer

3. Visual photometry

4. None of these

Option 2 – Photometer

The amount of radiant energy which is expressed in ergs per second, flowing from a source of light per unit time is called

1. Luminous flux

2. Light flux

3. Luminosity

4. (1) and (2)

Option 4 – (1) and (2)

The luminous flux or the light flux depends on

1. Luminosity

2. Illuminating power

3. Luminous intensity

4. 2 and 3

Option 4 – 2 and 3

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