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Physics Test - ...

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  • Question 1
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    A thin semicircular conducting ring of radius \(R\) is falling with its plane vertical in horizontal magnetic induction \(\overrightarrow{B}\). At the position \(MNQ\), the speed of the ring is \(V\), and the potential difference developed across the ring is:

  • Question 2
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    An electric dipole, when held at \(30^{\circ}\) with respect to a uniform electric field of \(10^{4}\mathrm N/\mathrm C\) experiences a torque of \(9 \times 10^{-26} \mathrm N\mathrm m \). Calculate the dipole moment of the dipole.

  • Question 3
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    Which of the following materials have higher retentivity of magnetism?

  • Question 4
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    Velocity of sound waves in air is \(330 \mathrm{~m} / \mathrm{s}\) for a particular sound wave in air, a path difference of \(40 \mathrm{~cm}\) is equivalent to phase difference of \(1.6 \pi\). The frequency of this wave will be:

  • Question 5
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    The ratio of the energy required to raise a satellite upto a height \(R\) (where \(R\) is the radius of earth) from the surface of the earth to the energy required to put it into an orbit at a height \(2 R\) from the surface of the earth is:

  • Question 6
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    In the figure, given that \(\mathrm{V}_{\mathrm{BB}}\) supply can vary from \(0\) to \(5.0 V, V_{CC}=5 V, \beta_{dc}=200, R_{B}=\) \(100 k \Omega, R_{C}=1 k \Omega\) and \(V_{BE}=1.0 V\). The minimum base current and the input voltage at which the transistor will go to saturation, will be respectively:

  • Question 7
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    A force produces an acceleration of \(5.0 \mathrm{~cm} / \mathrm{s}^{2}\) when it acts on a body of mass \(20 \mathrm{~g}\). Find the force acting on the body.

  • Question 8
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    An organ pipe \(P_{1}\), closed at one end vibrating in its first harmonic, and another pipe \(P_{2}\), open at both ends vibrating in its third harmonic, are in resonance with a given tuning fork. The ratio of the lengths of \(P_{1}\) and \(P_{2}\) is:

  • Question 9
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    The accuracy in the measurement of the diameter of hydrogen atom as \(1.06 \times 10^{-10}\) m is:

  • Question 10
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    A full-wave rectifier is fed with ac mains of frequency \(50\) Hz. What is the fundamental frequency of the ripple in the output current?

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