Physics GK · all questions

Light
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Q261

Which phenomenon deals with the scattering of light by molecules of a medium, when they are excited to vibrational energy levels?

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Q262

Which type of image of an object is formed by eye lens of the retina?

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Q263

Red light signal is used as a danger signal because

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Q264

The mirror, which is used in searchlights, is

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Q265

The wavelength extension of visible light is

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Q266

Which of the following is an example of scattering of light?

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Q267

The minimum distance of clear vision for a normal healthy eye of human being is supposed to be

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Q268

Which one of the following reflects back more sunlight as compared to other three?

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Q269

The process by which a prism forms different colours, is known as

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Q270

What is the concept of spherical mirror?

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Q271

The speed of light is maximum in which of the following mediums?

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Q272

When a beam of white light passes through a glass prism, the colour of light beam that deviates the least is

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Q273

Absolute refractive index of diamond is . . . . . . . .

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Q274

The focal length of the objective lens of a telescope is 50 cm. If the magnification of the telescope is 25, then the focal length of the eyepiece is

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Q275

In the absence of the earth's atmosphere, sky would appear

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Q276

A concave mirror is placed in front of the sun in such a way that the rays of the sun converge at a point 5 m away on the main axis of the mirror. Now if a candle 3 m long is placed at a distance of 10 m on the main axis of the mirror, how far will the image of the candle will be formed?

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Q277

The terminal colour bands of the rainbow are

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Q278

Assertion (A): A stick is dipped in water in a slanting position. If observed sideways, the stick appears short and bent at the surface of the water.
Reason (R): A light coming from the stick undergoes scattering from water molecules giving the stick a short and bent appearance.

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Q279

A defect of vision in which the points in one plane of an object appear infocus while those in another plane are out of focus is called

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Q280

The focal length of a convex lens is 25 cm. Calculate its power.

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