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Light Test - 9...

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  • Question 1
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    When an ultraviolet radiation is incident on a surface, no photoelectrons are emitted. If a second beam causes photo-electrons to be ejected, it may consist of

  • Question 2
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    A red cross on a white background, when seen through a red filter,

  • Question 3
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    A bird flying high up in air does not cast shadow on the ground because

  • Question 4
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    A man is 170 cm tall. He wants to see his full length image in a plane mirror. If his eyes are at a height of 164 cm from the ground, minimum length of the plane mirror should be

  • Question 5
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    Which of the following capital English letters does not show lateral inversion?

  • Question 6
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    An object is placed between two plane mirrors inclined at an angle to each other. If the number of images formed is 7, then the angle of inclination is

  • Question 7
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    In a looking mirror or a window pane, you find that your face appears larger than normal. The mirror or window pane is

  • Question 8
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    If the angle of incidence is equal to the critical angle, the angle of refraction will be

  • Question 9
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    Time taken by a ray of light to travel through a glass slab of thickness 4 cm and refractive index 1.5 will be

  • Question 10
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    A convex lens of focal length 1 metre is placed in contact with another concave lens of equal focal length. What is the focal length of the new lens formed?

  • Question 11
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    A thick lens has less focal length. Its power is

  • Question 12
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    A fly is sitting on the objective of a telescope pointed towards the moon. What effect is expected in photograph of the moon taken through the telescope?

  • Question 13
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    A microscope has an objective of 5 mm focal length and eyepiece of 30 mm focal length, and the distance between the lenses is 150 mm. The magnification is

  • Question 14
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    The deviation produced by a prism is

  • Question 15
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    A beam of white light after passing through a prism produces a spectrum with seven colours. This is because

  • Question 16
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    When sunlight enters the earth's atmosphere, the rays which get scattered the most are

  • Question 17
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    Water is transparent to visible light while water drops in air are opaque, because

  • Question 18
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    The twinkling of stars is due to

  • Question 19
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    If a person uses spectacles with concave lenses, he is suffering from

  • Question 20
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    Cylindrical lenses are used to correct the defect of

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