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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

  • Question 2
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    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

  • Question 3
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    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

  • Question 4
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    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

  • Question 5
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    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.

  • Question 6
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    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)

  • Question 7
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    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

  • Question 8
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    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.

  • Question 9
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    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

  • Question 10
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    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:

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