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Physics Test - ...

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  • Question 1
    1 / -0

    A force \(F=P y^{2}+Q y+R\) acts on a body in the y direction. The change in kinetic energy of the body during a displacement from \(y=-a\) to \(y=a\) is:

  • Question 2
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    If the momentum of a body is constant, then:

  • Question 3
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    The period of oscillation of a simple pendulum is \({T}=2 \pi \sqrt{\frac{{L}}{{g}}} \) Measured value of \({L}\) is \(10\) cm known to \(1\) mm accuracy and time for \(100\) oscillations of the pendulum is found to be \(50\) s using a wristwatch of \(1\) s resolution. What is the accuracy in the determination of g?

  • Question 4
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    The transmission of high frequencies in a coaxial cable is determined by:

  • Question 5
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    Black hole is an object whose gravitational field is so strong that even light cannot escape from it. To what approximate radius would earth (mass= \(5.98 \times 10^{24}\) kg) have to be compressed to be a black hole?

  • Question 6
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    The minimum external force needed to move a block kept on a rough surface is 250 N. Find the coefficient of friction between the surface and the block if the mass of the block is 40 kg. (g = 10 m/s2)

  • Question 7
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    A junction diode has a resistance of\(25 \Omega\)when forward-biased and\(2500 \Omega\) when reverse-biased. The current in the arrangement shown in the figure will be:

  • Question 8
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    A \(3.0\) cm wire carrying a current of \(10\) A is placed inside a solenoid perpendicular to its axis. The magnetic field inside the solenoid is given to be \(0.27\) T. What is the magnetic force on the wire?

  • Question 9
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    A ray is incident at an angle of incidence \(i\) on one surface of a small angle prism (with angle of prism \({A}\)) and emerges normally from the opposite surface. If the refractive index of the material of the prism is \(\mu,\) then the angle of incidence is nearly equal to

  • Question 10
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    The electromagnetic waves can be produced by:

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