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Physics Test - 61

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Physics Test - 61
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Weekly Quiz Competition
  • Question 1
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    A Fuse is used in mains electric supply as a safety devices. Which one of the following statements about the fuse is correct?

    Solution

    A Fuse is used in mains electric supply as a safety devices.

    The statements about the fuse is correct is it must have a low melting point.

  • Question 2
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    A boy sitting in a train moving with a uniform velocity drops a coin outside. A man standing outside the train will find the trajectory of the coin to be

    Solution

    Parabola, because when the coin is dropped at a particular point, it has the same velocity as the running train. So by Newton's first law, it continues its motion horizontally with that velocity. But then, it is also pulled down by earth's gravity continuously. In this situation its horizontal motion gives way to the parabolic motion until it reaches the ground.

  • Question 3
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    A balloon filled with hydrogen will

    Solution

    It will stop at a height where the weight of the balloon with contents is equal to the weight of air displaced by it, i.e , when the upthrust is equal to the downthrust. The question of bursting will depend on how much difference of pressure inside and outside , the material of the balloon can withstand. It is assumed the balloon is filled with a lighter than air gas like hydrogen or helium.

  • Question 4
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    Heat energy of an object is

    Solution

    Heat energy of an object isthe total energy of the molecules of the object.

  • Question 5
    1 / -0

    Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Then

    Solution

    Two bulbs are fitted in a room in the domestic electric installation. One of them glows brighter than the other. Thenthe brighter bulb has smaller resistance.

  • Question 6
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    Which of the following properties is found only in ferromagnetic materials ?

    Solution

    Hysteresis is found only in ferromagnetic materials.

  • Question 7
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    If a band is played on the moon the sound will

    Solution

    As there is no atmosphere surrounding the moon, the second from any band that is played there cannot travel outwards there is no material medium surrounding if for its propagation.

  • Question 8
    1 / -0

    For accurate scientific work, temperatures are often measured by

    Solution

    The resistance of metallic conductors e.g, platinum, increases with rise of temperature . The increase in temperature results in a decrease of current which can be recorded in a galvanometer if the conductor is included in an electrical circuit. Thus the temperature can be known; platinum resistance thermometer is used generally for accurate scientific work. When two dissimilar metals are joined at the ends, and these ends are subjected to a difference of temperature, a current flows through the metals. Greater the difference of temperature , greater the current. So the curent strength can form the basis for measuring the difference in temperature. And when one of these temperatures is known, we can calculate the other.

  • Question 9
    1 / -0

    SI unit of Luminious intensity is

    Solution

    SI unit of Luminious intensity is Candela.

  • Question 10
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    What causes brownian motion in colloids?

    Solution

    When their is a colloid in the solution, then it will show the Brownian movement, such as dust particle in the air will show the Brownian movement.

    Hence, Brownian movement arises due to the impact of the molecules of the dispersion medium with the colloidal particles. It has been postulated that the impact of the molecules of dispersion medium on the colloidal particles are unequal.

    This leads to the zig-zag (random) motion of the colloidal particles.

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