Physics GK · all questions

Light
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Q121

The technique to integrate and mark the image of a three dimensional object is

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Q122

An object is placed at the center of curvature of a concave mirror. Where will its reflection occur:

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Q123

Suppose a rocketship is proceeding from the Earth at a speed of

\frac{2}{10}^{t h}

the velocity of light. A light in the rocketship appears blue to the passengers on the ship. What colour would it appear to an observer on the Earth?

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Q124

Which of the following pairs of position of object - position of image - size of image, of image is not correct for concave mirror?

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Q125

Which is not a primary colour?

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Q126

The focusing in the eye is done by

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Q127

Tyndall effect is related to the . . . . . . . . . of light.

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Q128

Which of the following is not used to make lenses?

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Q129

In a periscope, the two plane mirrors are kept

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Q130

The absolute refractive index of any medium is always:

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Q131

Statement I Due to diffused or irregular reflection of light, a closed room gets light even if no direct sunlight falls inside the room.
Statement II Irregular reflection, where the reflected rays are not parallel, does not follow the laws of reflection.

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Q132

In case of a compound microscope, which of the following statements is/are correct?
1. The focal length of the eyepiece is larger than the focal length of the objective.
2. The focal length of the eyepiece is smaller than the focal length of the objective.
3. The image produced in a normal optical microscope is real.
4. The image produced in a normal optical microscope is virtual.
Select the correct answer:

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Q133

Soap solution used for cleaning purpose appears cloudy. This is due to the fact that soap micelles can

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Q134

Short sightedness is also called as . . . . . . . .

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Q135

A spherical mirror with reflective surface curved inward is called-

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Q136

Which of the following phenomena is involved in Kaleidoscope?

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Q137

The image formed by astronomical telescope is

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Q138

An object is placed at the centre of curvature of a concave mirror of focal length 16 cm. If the object is shifted by 8 cm towards the focus, then the nature of the image would be

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Q139

Which of the following is wrong about C.V. Raman?

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Q140

Due to which of the following reason, soap bubbles look colourful in white light?

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