Practice test

Light and optical instruments - Test Set 2

Review 20 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

20 questions

Questions and explanations

  1. Question 1

    To get the magnified and virtual image mirror is used________.
    1. Plane Mirror
    2. Convex Mirror
    3. Concave Mirror
    4. Concave Lens
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  2. Question 2

    Which of the following always makes the smaller image of body, which is placed in front of it?
    1. Concave Mirror
    2. Plane Mirror
    3. Convex Lens
    4. Convex Mirror
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  3. Question 3

    The image formed by specific mirror; legs appears as of same size but head and his body appears smaller than its real size, when person stands in front of mirror. What is the nature of mirror?
    1. Convex and Plane
    2. Convex and Concave
    3. Plane and Concave
    4. Plane
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  4. Question 4

    What is a zoom lens?
    1. A lens with a definite focal length
    2. A lens with a transitional focal length
    3. It is used in Radio Telescopes.
    4. None of these
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  5. Question 5

    Dioptre is the unit of
    1. Focal length of lens
    2. Intensity of sound
    3. Power of lens
    4. Intensity of lens
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  6. Question 6

    Radio telescope are better than optical telescopes because
    1. They can detect faint galaxies which cannot be done by optical telescope.
    2. They can even work in cloudy conditions.
    3. They can work during day and night.
    4. All of the above.
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  7. Question 7

    To eliminate the glare of headlight in motorcars
    1. Polaroid’s are used.
    2. Filters are used.
    3. Glass prism are used.
    4. Thin films are used.
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  8. Question 8

    The outer white part of the eye that protects the inner structures is ______.
    1. Iris
    2. Solera
    3. Retina
    4. Cornea
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  9. Question 9

    Person who is color blind can not distinguish between
    1. Black and yellow
    2. Yellow and white
    3. Red and green
    4. Green and blue
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  10. Question 10

    The least distance of distinct Vision is
    1. 15 cm
    2. 35 cm
    3. 45 cm
    4. 25 cm
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  11. Question 11

    Distant objects are visible as little out of focus in the condition
    1. Myopia
    2. Astigmatism
    3. Hypermetropia
    4. Presbyopia
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  12. Question 12

    Sensitivity of human eye is maximum in the
    1. Violet region
    2. Green region
    3. Blue region
    4. Red region
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  13. Question 13

    A man can not see clearly beyond 10 meters. The disease he suffers from.
    1. Cataract
    2. Far sight
    3. Myopia
    4. Hypermetropia
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  14. Question 14

    The part of the eye having largest refractive index is
    1. Cornea
    2. Vitruous humor
    3. Aqueous humor
    4. Lens
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  15. Question 15

    Hypermetropia or long sightedness can be corrected by using
    1. Convex lenses
    2. Concave lenses
    3. Cylindrical lenses
    4. Bifocal lenses
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  16. Question 16

    The final image in a simple microscope is
    1. Virtual, diminished and erect
    2. Virtual, magnified and erect
    3. Real, diminished and inverted
    4. Real, magnified and erect
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  17. Question 17

    Is dangerous to observe solar eclipse with naked eyes because
    1. Cosmic rays reach eyes more during the eclipse
    2. All radiations from sun initiate chemical reactions in eyes
    3. Ultraviolet radiations from sun burn our retina
    4. Infrared radiations from sun burn our retina
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  18. Question 18

    Gold and copper happen to absorb ______ and violet light, leaving yellow light.
    1. Green
    2. Blue
    3. Red
    4. Orange
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  19. Question 19

    The absolute refractive index of ______ is 2.42.
    1. Air
    2. Diamond
    3. Crown glass
    4. Water
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  20. Question 20

    Apart from the red and green wavelengths of sunlight, which other wavelength of sunlight is absorbed by water molecules in the ocean?
    1. Orange
    2. Blue
    3. Violet
    4. Yellow
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