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SAT (Stage-2) Mock Test - 1

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Weekly Quiz Competition
  • Question 1
    1 / -0

    A parachutist of weight W strikes the ground with his legs fixed and comes to rest with an upward acceleration of 3g. The force exerted by him on the ground during landing is

    Solution

    A parachutist of weight W strikes the ground with his legs fixed and comes to rest with an upward acceleration of 3g.
    Let F is the upward force
    ma = F - mg
    m(3g) = F - mg
    F = 3mg + mg = 4 mg
    F = 4W

     

  • Question 2
    1 / -0

    If refractive index for glass is 1.5, and the velocity of light in vacuum is 3.0 × 108 m/sec, the time taken by the light in travelling a distance of 300 m in glass will be

    Solution

    μ = c/v

    1.5 = 3 x 108/300 x t

    t = 1.5 x 10-6 sec

     

  • Question 3
    1 / -0

    Gravity is a conservative force. Which of the following is incorrect about this force?

    Solution

    Kinetic energy depends upon the speed and mass of the body. More massive objects would have more kinetic energy than other objects of the same mass.

     

  • Question 4
    1 / -0

    At what height above the earth's surface does the acceleration due to gravity fall to 1% of its value at the earth's surface?

    Solution

    GM/R2 = 9.8 m/s2
    g/100 = 1.1% of g means the denominator of the first equation will be 100 times R2

    100R2 = (10R)2 = (h + R)2 (where h is the altitude)

    10R = h + R

    9R = h

     

  • Question 5
    1 / -0

    A and B are two objects. The temperature of A is greater than that of B. This means that

    Solution

    The temperature of an object is a property of the object that determines how hot or cold the body is. It depends on the amount of thermal energy absorbed by the object and also the nature of the object and its mass. Moreover, movement of molecules in an object increases the heat. More the movement, more will be the temperature.

     

  • Question 6
    1 / -0

    Ultrasonic, infrasonic and audible waves travel through a medium with speeds vu, vi and va, respectively. Which of the following relations holds true?

    Solution

    All the three waves will travel with the same speed. The difference lies in their wavelengths and frequencies.

     

  • Question 7
    1 / -0

    Which of the following salts possesses water of crystallisation?

    Solution

    Gypsum is calcium sulphate dihydrate and possesses two molecules of water of crystallisation in its structure, i.e. CaSO4.2H2O.

     

  • Question 8
    1 / -0

    Which of the following is basic in nature?

    Solution

    CaO is basic in nature as the oxides of alkali metals (1st group) and alkaline metals (2nd group) are basic oxides.

     

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