CTET Solved Paper - CTET Feburary 2016 Paper2

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57. There are two planets in our solar system whose periods of revolution around the Sun are less than those of our Earth, but their periods of rotation are more as compared to those of the Earth. These planets are

  • Option : B
  • Explanation : The time taken to complete one revolution around the sun by planets is called the period of revolution. It depends on the distance from the sun. More the distance from the Sun, more will be the time taken to complete one revolution. Mercury and Venus are nearer to the sun than the Earth. so, their periods of revolution are lesser than that of the Earth. Their periods of rotation are more than the Earth. ValueS of periods taken by the planet to revolve and rotate are independent of each other.
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58. The melting points (in °C) of Sulphur (S), Aluminium (Al) and Iron (Fe) are 113, 666 and 1535, respectively. Which one of the following is correct?

  • Option : B
  • Explanation : The melting point is the temperature at which solid melts (changes into liquid). Here Aluminium(Al) and Iron (Fe) have the melting point of more than 200°C. So, they will remain in the solid state at 200°C.
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59. An electric circuit is set up in such a way that the positive terminal of a battery V is connected to a bulb Bl which is connected to a resistor R which is connected to bulb B2. B2 is finally connected to the negative terminal of the battery. Both the bulbs are glowing. If the value of R is increased, then

  • Option : A
  • Explanation : The direction of flow of current in a circuit is from positive to negative terminal of a battery. In the given circuit, with an increase in the value of resistance of a resistor (which reduces the flow of current), the current flow to bulb B2 will be affected. In this case, bulb B2 will become dimmer and bulb B1, will remain unchanged.
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