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  • Question
  • A series of fast moving still pictures can be made to appear as a moving picture because the eye


  • Options
  • A. can focus very rapidly as pictures change
  • B. is quicker than the brain
  • C. can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second
  • D. can shut out some of the light

  • Correct Answer
  • can see 2 images separated only if the interval betwen seeing them is more than one-tenth of a second 

    Explanation

    The eye can see images separately only if they are exhibited at an interval of more than 1/10 of a second. In the case of a movie, the still pictures come one after the other at less than this minimum interval. So we do not see them separately but only as a continuous moving picture.


  • Physics problems


    Search Results


    • 1. Radio waves sent out by a radio stations are reflected by

    • Options
    • A. troposphere
    • B. stratosphere
    • C. mesosphere
    • D. ionosphere
    • Discuss
    • 2. Tap water is placed in an open pad and allowed to evaporate. After some time the temperature of water

    • Options
    • A. increases to a great extent
    • B. increases slightly
    • C. decreases slightly
    • D. decreases rapidly
    • Discuss
    • 3. The cover of a solar coker is made of glass because

    • Options
    • A. it absorbs sun's rays
    • B. it reflects sun's rays
    • C. it retains the heat inside by the green house effect
    • D. it rediates heat better than metals
    • Discuss
    • 4. The fact that two large ships travelling on close parallel courses in the same direction tend to move towards each other can be explained by

    • Options
    • A. Bernoulli's principle
    • B. Magnetic properties of the ship's material
    • C. Newton's third law of motion
    • D. Earth's gravitational force
    • Discuss
    • 5. A capillary tube is partially dipped vertically in a vessel containing water. Due to capillarity water rises in the tube. The height of water rise in the tube can be increased by

    • Options
    • A. decreasing the radius of the capillary tube
    • B. increasing the radius of the capillary tube
    • C. increasing the height of water in the vessel
    • D. None of these
    • Discuss
    • 6. An integrated circuit is more advantages than a coventional circuit because

    • Options
    • A. they make the electric equipments more reliable and easier for servicing
    • B. a faulty part of a conventional circuit may be difficult to locate and repair
    • C. if a part of the integrated circuit fails the entire circuit is simply replaced
    • D. all the above
    • Discuss
    • 7. A bimetal made copper and iron strips welded together is straight at room temperature. It is held vertically with iron strip towards left and copper strip towards right. If this bimetal is heated , it will

    • Options
    • A. remain straight
    • B. bend towards right
    • C. bend towards left
    • D. none of these
    • Discuss
    • 8. The ability to do work is called Energy.

    • Options
    • A. TRUE
    • B. FALSE
    • Discuss
    • 9. Which part of the flame is the hottest?

    • Options
    • A. Blue Zone
    • B. Luminous Zone
    • C. Dark Zone
    • D. Non - Luminous Zone
    • Discuss
    • 10. Compressions and Rarefactions are characteristic of

    • Options
    • A. Longitudinal waves
    • B. Transverse waves
    • C. Both A & B
    • D. Neither of A & B
    • Discuss


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