Practice test

Light and optical instruments - Test Set 6

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

    Lens is made up of
    1. Ordinary glass
    2. Pyrex glass
    3. Cobalt glass
    4. Flint glass
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  2. Question 2

    For a person having hypermetropia, the near point is
    1. Less than 25 cm
    2. Greater than 25 cm
    3. Greater than 50 cm
    4. Infinity
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  3. Question 3

    The head mirror used by ENT doctors is
    1. Plano-convex
    2. Concave
    3. Convex
    4. Plane
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  4. Question 4

    Vehicles use ______ to see the objects coming from behind
    1. Concave Lens
    2. Convex Lens
    3. Convex Mirror
    4. Concave Mirror
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  5. Question 5

    What is a compound microscope
    1. A microscope that has one lens
    2. A microscope that has two set of lenses
    3. A microscope whose lenses are concave
    4. A microscope whose lenses are convex
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  6. Question 6

    Convex mirrors are used as a rear view mirror in motor cycles because
    1. It forms smaller image as compared with object
    2. It forms erect image
    3. It forms real image
    4. All of the above
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  7. Question 7

    Persons suffering from myopia are advised to use
    1. Concave lens
    2. Convex lens
    3. Plano-concave lens
    4. Plano-convex lens
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  8. Question 8

    Magnifying Glass is basically a
    1. Plano-concave lens
    2. Convex lens
    3. Concave lens
    4. Cylindrical lens
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  9. Question 9

    Shaving Mirror is
    1. Convex
    2. Parabolic
    3. Concave
    4. Plane
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  10. Question 10

    Which type of mirror is used in the head lights of vehicles
    1. Plane Mirror
    2. Parabolic Mirror
    3. Convex Mirror
    4. Concave Mirror
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  11. Question 11

    Electron Microscope is more magnifier than light magnifying because
    1. More powerful lenses are used in electron Microscope
    2. Electron contains more energy than particles
    3. Wavelength of electron is less than the wavelength of light
    4. Velocity of electron is less than velocity of light
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  12. Question 12

    A periscope works on the principle of
    1. Refraction
    2. Reflection
    3. Diffraction
    4. Total Internal Reflection
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  13. Question 13

    A compound microscope has
    1. Two lenses
    2. Used to view only dead organisms
    3. Requires UV light source
    4. Requires large room space
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  14. Question 14

    X-rays are
    1. Beams of electrons
    2. Electromagnetic radiations of very short wavelength
    3. Visible to the naked eye
    4. Electromagnetic radiations of very long wavelength
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  15. Question 15

    The image formed by a plane mirror is
    1. Real and erect
    2. Virtual and inverted
    3. Virtual and erect
    4. Real and inverted
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  16. Question 16

    'Red' is used as a danger signal because
    1. Blood is red.
    2. Red light is scattered least by the air molecules.
    3. Red colour is easily available.
    4. Red colour is soothing for the eye.
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  17. Question 17

    Red + Green + Blue = ?
    1. White
    2. Black
    3. Maroon
    4. Blue
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  18. Question 18

    A light year is
    1. Light emitted by the Sun in one year.
    2. Time taken by light to travel from Sun to Earth.
    3. The distance travelled by light in free space in one year.
    4. Time taken by Earth to go once around the Sun.
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  19. Question 19

    Twinkling of stars is on account of
    1. Large distance of stars and storms in air.
    2. Rotation of Earth.
    3. Large size of Earth.
    4. Large distance of stars and fluctuations in the density of air.
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  20. Question 20

    Light from the Sun reaches us in nearly
    1. 2 minutes
    2. 8 minutes
    3. 4 minutes
    4. 16 minutes
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