Practice test

Light and optical instruments - Test Set 1

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

    Short-sight in human eye can be corrected by using proper
    1. Convex lens
    2. Bifocal lens
    3. Cylindrical lens
    4. Concave lens
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  2. Question 2

    Myopia is the same as
    1. Near sightedness
    2. Astigmatism
    3. Presbyopia
    4. Long sightedness
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  3. Question 3

    The owl can see most clearly in total darkness because
    1. It has squint eyes
    2. It has large eyes with rods directed forward, giving it binocular sight
    3. It has light bulbs in its eyes provided by nature
    4. It produces infrasonic sounds
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  4. Question 4

    What is myopia?
    1. It is a condition of enlargement of heart
    2. Abnormal functioning of the thyroid gland
    3. Inability to see distant objects clearly
    4. It is a kidney disorder
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  5. Question 5

    The Sky appears to an astronaut—
    1. White
    2. Dark Blue
    3. Light Green
    4. Black
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  6. Question 6

    Colour blindness defect can be corrected by using the lens—
    1. Concave Lens
    2. Cylindrical lens
    3. Convex Lens
    4. None of these
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  7. Question 7

    Protanopia is a kind of colourblindness, in which defected person can’t see the colour______
    1. Blue
    2. Red
    3. Green
    4. All of these
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  8. Question 8

    The Plate of Blue glass appears blue in sunlight because—
    1. It transmits the blue light
    2. It absorb the blue light
    3. It absorbs all the colours including blue
    4. Transmits all the colours including blue.
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  9. Question 9

    Photon is the fundamental unit/quantum of
    1. Magnetism
    2. Light
    3. Electricity
    4. Gravitation
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  10. Question 10

    Light beam which is highly directional is called
    1. Grazer
    2. Maser
    3. Laser
    4. Eraser
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  11. Question 11

    Persistence of vision is the principle behind
    1. Cinema
    2. Periscope
    3. Camera
    4. Binocular
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  12. Question 12

    Which of the following is responsible for the working of newton’s colour disc experiment
    1. Principle of complementary colour
    2. Persistence of vision
    3. Formation of impure spectra
    4. Formation of pure spectra
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  13. Question 13

    In mirrors the back surface is painted with a thin layer of
    1. Mercury
    2. Silver Nitrate
    3. Silver
    4. Red oxide
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  14. Question 14

    Find the power of a convex lens if the image formed is at a distance of 10 cm from the lens when the object is placed on the other side of the lens at 40 cm from the optical centre?
    1. -7.5 dioptre
    2. -12.5 dioptre
    3. 7.5 dioptre
    4. 12.5 dioptre
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  15. Question 15

    Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 60 cm from the optical centre?
    1. 6.67 dioptre
    2. 3.33 dioptre
    3. -6.67 dioptre
    4. -3.33 dioptre
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  16. Question 16

    Find the power of a convex lens if the image formed is at a distance of 20 cm from the lens when the object is placed on the other side of the lens at 25 cm from the optical centre?
    1. 1 dioptre
    2. 9 dioptre
    3. 1 dioptre
    4. -9 dioptre
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  17. Question 17

    Which of the following is used to split white light into different colours?
    1. Glass slab
    2. Convex lens
    3. Prism
    4. Concave lens
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  18. Question 18

    Spectacles used for viewing 3D films have
    1. Bifocal lens
    2. Convex lens
    3. Concave lens
    4. Polaroids
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  19. Question 19

    A concave lens always form an image which is
    1. Virtual and erect
    2. Virtual and inverted
    3. Real and inverted
    4. Real and erect
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  20. Question 20

    One can distinguish a telescope from a microscope by observing
    1. Length
    2. Size of the lens
    3. Colour
    4. length and size of the lens
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