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Physics Test-12...

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  • Question 1
    4 / -1

    A satellite revolves in the geostationary orbit in the east-west direction. The time interval between its successive passing about a point on the equator is:

  • Question 2
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    The length of a wire is ' \(L\) ' and volume is \(\mathrm{V}\) (fixed). If constant force \(F\) is applied on the wire, the extension produced in the wire will be proportional to________.

  • Question 3
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    A carnot engine takes in \(3000 \mathrm{~K}\) Cal of heat from reservoir at \(627^{\circ} \mathrm{C}\) and gives it to a sink at \(25^{\circ} \mathrm{C}\). The work done by the engine is:

  • Question 4
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    Which of the following best represents the relationship between internal energy 'U' of an ideal gas and its absolute temperature 'T'?

  • Question 5
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    Two simple Harmonic Motions of angular frequency 100 and \(1000 \mathrm{rad} \mathrm{s}^{-1}\) have the same displacement amplitude. The ratio of their maximum accelerations is:

  • Question 6
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    Two capacitors of capacitance \(6 \mu \mathrm{F}\) and \(4 \mu \mathrm{F}\) are put in series across a \(120 \mathrm{~V}\) battery. What is the potential difference across the \(4 \mu \mathrm{F}\) capacitor?

  • Question 7
    4 / -1

    Temperature dependence of resistivity of a metal can be described by:

  • Question 8
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    If earth is assumed to be a giant bar magnet of magnetisation of value \(72.8 \mathrm{Am}^{-1}\) and radius \(6400 \mathrm{~km}\),. Then find the earth's magnetic moment will be:

  • Question 9
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    A coil of wire of radius \(\mathrm{R}\) has 200 turns and self - inductance of \(108 \mathrm{mH}\). The self inductance of a similar coil of 500 turns will be:

  • Question 10
    4 / -1

    In the visible spectrum, the colour having the shortest wavelength is:

  • Question 11
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    If the mirror of a periscope is replaced by lenses then which of the following phenomenon will occur to operate the periscope properly?

  • Question 12
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    In the Bohr model, the Rydberg formula to calculate the wavelength of emitted or absorbed photons is:

  • Question 13
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    The current gain of a common emitter transistor amplifier is 80 . If the input resistance is \(400 \Omega\) and the load resistance is \(5 \mathrm{k} \Omega\), then find the voltage gain of the amplifier.

  • Question 14
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    If the size of an antenna is 100 m, then which of the following statement is correct?

  • Question 15
    4 / -1

    When a transistor is used in the common emitter mode as an amplifier, then which of the following pair acts as an input junction:

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