Practice test

Light and optical instruments - Test Set 7

Review 17 exam-focused questions with detailed explanations, then start the interactive test when you are ready.

17 questions

Questions and explanations

  1. Question 1

    Sir C. V. Raman was awarded the Nobel Prize for his work connected with which of the following phenomena of radiation?
    1. Scattering
    2. Diffraction
    3. Interference
    4. Polarization
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  2. Question 2

    The power of a lens is +2.0D. The focal length of the lens and its nature are
    1. 50 cm, concave
    2. 50 cm, convex
    3. 100 cm, convex
    4. 100 cm, concave
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  3. Question 3

    The spectrum of colour in a Compact Disc (CD) is due to
    1. Refraction
    2. Reflection
    3. Diffraction
    4. Polarisation
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  4. Question 4

    A concave spherical mirror has a radius of curvature of 30 cm. An object was placed 15 cm away from the pole in front of the mirror on the principal axis. Choose the correct option for the position, size and nature of the image formed, respectively.
    1. Behind the mirror, enlarged, virtual and erect.
    2. At infinity, highly enlarged, real and inverted.
    3. Between Focus and Centre, diminished, real and inverted.
    4. At the focus, highly diminished point-sized, real and inverted.
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  5. Question 5

    In optics, which term refers to the opening of the diaphragm of a lens that spatially limits the propagation of light?
    1. Collimator
    2. Acoustic
    3. Lateral
    4. Memiscus
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  6. Question 6

    White light is an example of ______.
    1. laser light
    2. plane polarized light
    3. monochromatic light
    4. polychromatic light
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  7. Question 7

    Which telescope was invented by Isaac Newton in the 17th century by using a concave mirror to collect light instead of a simple lens which produces false colors due to the dispersion of light?
    1. Reflecting telescope
    2. Infrared telescope
    3. Monocular telescope
    4. Graphic telescope
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  8. Question 8

    Which colour of light from VIBGYOR has minimum energy?
    1. Green
    2. Violet
    3. Yellow
    4. Red
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  9. Question 9

    What will be the focal length of a convex lens with the power of a +2.5 Diopter?
    1. 20 cm
    2. 10 cm
    3. 40 cm
    4. 5 cm
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  10. Question 10

    Raman wants to use a rear-view mirror in his vehicle. Which type of mirror should he pick for it?
    1. Convex Mirrors
    2. Plane Mirrors
    3. Cylindrical Mirrors
    4. Concave Mirrors
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  11. Question 11

    An image formed by the convex mirror is always ______.
    1. virtual and inverted
    2. real and erect
    3. virtual and erect
    4. real and inverted
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  12. Question 12

    Which of the following statements regarding the lenses is/are correct?
    I. Power of a convex lens is represented as a positive number.
    II. Power of a concave lens is represented as a negative number.
    1. Both I and II
    2. Only I
    3. Only II
    4. Neither I nor II
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  13. Question 13

    Which of the following pair of position of object – position of image – size of image, is NOT correct for concave mirror?
    1. At F - At infinity - Highly enlarged
    2. Between C and F - Beyond C - Enlarged
    3. Beyond C - Between F and C - Diminished
    4. At infinity - At C - Highly diminished
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  14. Question 14

    If ‘u’ is the object-distance, ‘v’ is the image-distance and ‘f’ is the focal length of a spherical mirror then which of the following is a correct expression for the mirror formula?
    1. 1/v+1/u=−1/f
    2. 1/v−1/u=1/f
    3. 1/v+1/u=1/f
    4. 1/v−1/u=−1/f
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  15. Question 15

    The splitting of white light into its component colours is called ______.
    1. Refraction
    2. Reflection
    3. Scattering
    4. Dispersion
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  16. Question 16

    The reflection on a bathroom mirror, the lake, and the glare on a pair of glasses are caused by which type of reflection?
    1. Multiple reflection
    2. Specular reflection
    3. Glossy reflection
    4. Diffused reflection
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  17. Question 17

    Which of the following elements is NOT suitable for the fabrication of a light emitting diode structure?
    1. Gallium phosphide
    2. Indium gallium nitride
    3. Germanium
    4. Gallium arsenide
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