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JEE Photometry PYQs with Solutions

40 previous year questions from Photometry (JEE Main & Advanced Physics) with answers and solutions. Numbered list, year tags, and one-tap solutions — built for serious JEE / NEET practice.

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About Photometry PYQs

Photometry has 40 previous year questions in the Quantrex Academy JEE Main & Advanced Physics bank. The 40 questions in this list come from Concepts Of Physics MCQ Edition [Volume 1] (40). Each question opens on its own page with the options, the correct answer and the worked solution where available.

JEE Photometry PYQs with Solutions

About Photometry PYQs

Photometry questions with solutions

Calculate the radiant flux of a source if it emits 45 joules of energy over a period of 15 s .

When exposed to a 10 W source for 12 s , a photographic plate records sufficiently intense lines. To obtain equally intense lines, what should be the exposure time for a 12 W

Based on the relative luminosity curve shown in the figure, determine the relative luminosity of wavelength 600 nm .

Based on the relative luminosity curve shown in the figure, determine the relative luminosity of wavelength 600 nm .

Based on the relative luminosity curve shown in the figure, determine the relative luminosity of wavelength 600 nm .

The relative luminosity for a wavelength of 600 nm is 0.6 . Determine the radiant flux at 600 nm required to generate the same brightness sensation as that produced by a radiant

Based on the relative luminosity curve shown in the figure, determine the relative luminosity of wavelength 600 nm .

A monochromatic source of 1 W produces a luminous flux of 450 lumen . Determine the relative luminosity at the emitted wavelength.

A source emits light of wavelengths 555 nm and 600 nm . The radiant flux of the 555 nm part is 40 W while that of the 600 nm part is 30 W . The relative luminosity at 600 nm is

A source emits light of wavelengths 555 nm and 600 nm . The radiant flux of the 555 nm part is 40 W while that of the 600 nm part is 30 W . The relative luminosity at 600 nm is

A source emits light of wavelengths 555 nm and 600 nm . The radiant flux of the 555 nm part is 40 W while that of the 600 nm part is 30 W . The relative luminosity at 600 nm is

A light source produces monochromatic light of wavelength 555 nm . It consumes 100 W of electric power and emits 35 W of radiant flux. Compute the overall luminous efficiency.

A source uniformly radiates 31.4 W of radiant flux in all directions. If the luminous efficiency is 60 lumen watt^ -1 , determine the luminous intensity of the source.

A point source, positioned at the origin, emits 628 lumen of luminous flux uniformly in all directions. Determine the illuminance on a small area located at (1.0 m, 0, 0) , given

The illuminance of a small area changes from 900 lumen m^ -2 to 400 lumen m^ -2 when it is shifted by 10 cm along its normal. Assuming illumination by a point source positioned on

A point source emitting light uniformly in all directions is situated 60 cm above a table-top. At a point on the table-top directly beneath the source, the illuminance is 15 lux .

Light from a point source strikes a small area oriented perpendicular to the incident light. If the area is rotated by an angle of 60^ ^ ^ ∘ about the incident light, by what

A student is reading a book located near the edge of a circular table of radius R . A point source of light is suspended directly above the centre of the table. Determine the

As illustrated in the figure, a small diffused plane source S is positioned 2.4 m above a horizontal table-top, such that its plane is parallel to the table-top. At point A

When positioned at 80 cm and 20 cm from a photometer screen respectively, an electric lamp and a candle generate equal illuminance. The lamp is subsequently covered with a thin

Two light sources having intensities of 8 cd and 12 cd are positioned on the same side of a photometer screen, at a distance of 40 cm from it. At what distance must an 80 cd

When the wavelength is increased from violet to red, the luminosity

Three light sources A , B , and C emit an identical amount of radiant energy per unit time. The wavelengths produced by the three sources are 450 nm , 555 nm , and 700 nm

An electric bulb is suspended over a table at a height of 1 m . The illuminance on the table directly beneath the bulb is 40 lux . The illuminance at a point on the table located

Light originating from a point source strikes a screen. If the separation between the source and the screen is increased by 1\% , the illuminance decreases by approximately

At a small distance r from a long cylindrical light source, the intensity produced is proportional to

The single parameter that dictates the brightness of a light source perceived by an eye is

When positioned 5 cm away from a weak point source, a photographic plate requires an exposure time of 3 s . If the plate is instead located at a distance of 10 cm from the source

A photographic plate is positioned directly in front of a small diffused source shaped as a circular disc. Obtaining a good exposure takes 12 s . If the source is rotated by 60^ ^

A point source of light travels in a straight line parallel to a plane table. Consider a small portion of the table directly beneath the line of motion of the source. The

The figure displays a glowing mercury tube. The intensities at points A , B , and C are related by

A battery-operated torch is configured to emit an almost parallel beam of light. When the light strikes a wall 2 m away, it produces an illuminance of 40 lux . The illuminance

Identify the correct statements from the following.

Select the correct options from the following.

An extended source illuminates a room. The illuminance at a specific section of a wall can be enhanced by

The brightness-producing capability of a source

Identify the correct statements from the following.

Select the correct options from the following.

An extended source illuminates a room. The illuminance at a specific section of a wall can be enhanced by

The brightness-producing capability of a source

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