Physics GK · all questions

Light
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Q161

Which mirror is used as a rear view mirror for the wider field of view in vehicles?

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Q162

If an object is placed between the focus and the pole in a concave mirror, what will be the type of image formed?

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Q163

Who measured the velocity of light first?

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Q164

Find out the odd colour from the following options.

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Q165

Three colours are the primary colours. These are

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Q166

Where is the image of an object formed in the eye of a person suffering from longsightedness?

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Q167

Photosynthesis using the invisible part of the Sunlight is done by some

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Q168

Power of a lens is inversely proportional to . . . . . . . .

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Q169

A rainbow is produced due to which one of the following phenomena?

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Q170

The use of a concave mirror is not:

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Q171

In the mirror formula, what does 'v' indicates?

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Q172

If the power of a corrective lens is + 2.0D, then it is a-

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Q173

The gas used in discharge tubes for optical decoration and advertising is

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Q174

Which of the seven colors of white light is least disturbed after the reflection of light by a prism of glass?

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Q175

Spectacles used for viewing 3D films have

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Q176

Convex mirrors are used in-

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Q177

Why do stars twinkle in the sky at night?

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Q178

Convex mirrors are used as a rear view mirror in motor cycles because

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Q179

Assertion (A): Small glass beads fixed on traffic signals glow brightly when light falls upon them.
Reason (R): Light is totally reflected when the angle of incidence exceeds a certain critical value and light travelling in a denser medium is reflected from a rarer medium.

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Q180

A colour blind person cannot

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