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Physics Test 50

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Physics Test 50
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  • Question 1
    4 / -1

    A simple pendulum hanging from the ceiling of a stationary lift has a time period t1. When the lift moves downwards with a constant velocity, the time period becomes t2. Then

    Solution

    The lift is moving with a constant velocity so, the acceleration will be zero. Thus, the time period will remain the same.

    Hence, the correct option is (D).

     

  • Question 2
    4 / -1

    Electromagnetic waves of frequencies higher than 9√2 MHz are found to be not reflected by the ionosphere on a particular day at a place. The maximum electron density in the ionosphere is

    Solution

     

     

  • Question 3
    4 / -1

    A satellite of mass m is placed at a distance r from the centre of Earth (mass M). The mechanical energy of the satellite is

    Solution

     

     

  • Question 4
    4 / -1

    A magnetising field of 1500Am−1 produces flux of 2.4×10−5 weber in a iron bar of the cross-sectional area of 0.5 cm2. The permeability of the iron bar is

    Solution

     

  • Question 5
    4 / -1

    A boatman can row at a speed of 10kmh−1. If a river of width 2 km flows at 5kmh−1, then find the direction in which the boatman should row to reach a point on the other bank directly opposite to the point from where he started.

    Solution

    To reach a point directly opposite, horizontal velocity should be zero. Let boatman's velocity in still water be = ′b′ .

    Let river's flow rate be "r".

    Then,

     

  • Question 6
    4 / -1

    A stone released with zero velocity from the top of a tower reaches the ground in 4 s. The height of the tower is (g = 10 m/s2)

    Solution

     

     

  • Question 7
    4 / -1

    A container of volume 1 m3 is divided into two equal parts by a partition. One part has an ideal gas at 300 K and the other part contains a vacuum. The whole system is thermally isolated from the surroundings.

    When the partition is removed, the gas expands to occupy the whole volume. Its temperature will now be

    Solution

    Since the system is insulated, the before dQ = 0.

    In part, there is no pressure (because of the Vacuum)

    So, work done dW = PdV = 0

    From dQ = dU + dW, we get dU=0

    Since, U depends on temperature, so dU = 0

    This means that there is no change in temperature.

    Hence, the correct option is (C).

     

     

  • Question 8
    4 / -1

    Compute the fractional change in volume of a glass slab, when subjected to a hydraulic pressure of 10 atm. Bulk modulus of glass 37 GPA.

    Solution

     

  • Question 9
    4 / -1

    An asteroid of mass m is approaching earth, initially at a distance 10Re with speed vi. It hits earth with a speed vf(Re and Me are radius and mass of the earth), then

    Solution

    Applying law of conservation of energy for asteroid at a distance 10Re and at earth's surface,

     

  • Question 10
    4 / -1

    Pure silicon at 300 K has equal electron (ne) and hole (nh) concentration of 1.5 × 1016m−3. Doping by indium increases nh to 4.5 ×1022m−3. The ne in the doped silicon is:

    Solution

     

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