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Physics Test - ...

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  • Question 1
    4 / -1

    Electromagnetic waves are produced by:

  • Question 2
    4 / -1

    Disadvantage of PCM is its:

  • Question 3
    4 / -1

    Which among the following statements is true about Huygen's principle?

  • Question 4
    4 / -1

    The electric field of a plane electromagnetic wave is given by:

    \(\overrightarrow{\mathrm{E}}=\mathrm{E}_{0}(\hat{\mathrm{x}}+\hat{\mathrm{y}}) \sin (\mathrm{kz}-\omega \mathrm{t})\)

    Its magnetic field will be given by:

  • Question 5
    4 / -1

    Which of the following is true?

  • Question 6
    4 / -1

    A particle of mass m is moving in a horizontal circle of radius r under the action of centripetal force expressed as\(-\frac{k}{r^{2}}\), where k is constant. The total energy of the particle is:

  • Question 7
    4 / -1

    A semiconductor in its purest form is known as _______

  • Question 8
    4 / -1

    A dielectric slab of thickness \(1.0 cm\) and dielectric constant \(5\) is placed between the plates of a parallel plate capacitor of plate area \(0.01 m ^{2}\) and separation \(2.0 cm\). Calculate the change in capacity on the introduction of the dielectric.

  • Question 9
    4 / -1

    A capacitor and an inductor is connected in series with an ac source in a circuit. If the capacitance of the capacitor is \(18 \mu \mathrm{F}\) and the inductance of the inductor is \(8 H\) then find the resonance frequency of the circuit.

  • Question 10
    4 / -1

    Why amplification of a signal is necessary in a communication system?

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