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Physics Test - ...

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  • Question 1
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    When the plane surface of a plano-convex lens of refractive index \(1.5\) is silvered, it behaves like a concave mirror of focal length \(30 \) cm. When its convex surface is silvered, it will behave like a concave mirror of focal length

  • Question 2
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    In Young's double slit experiment, if the distance between the slits and the screen is doubled and the separation between the slits is reduced to half, the fringe width

  • Question 3
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    The resistance of a wire is 5Ω. It's new resistance in ohm if stretched to 5 times of it's original length will be :

  • Question 4
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    The relation between the kinetic energy of the ejected electrons from the metal surface and the frequency of the incident radiation in photoelectric effect is given by:

  • Question 5
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    A piece of wood has dimensions \(a, b\) \(c\) Its relative density is \(d\). It is floating in water such that the side \(c\) is vertical. It is now pushed down gently and released. The time period is:

  • Question 6
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    A body moving in a straight line with an initial velocity of \(5 ~ms^{-1}\) and a constant acceleration covers a distance of \(30 ~m\) in the \(3 rd\) second. How much approx distance will it cover in the next \(2\) seconds?

  • Question 7
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    What is an astronomical unit defined as?

  • Question 8
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    Find the dimensional formula for magnetic field \(\vec{B}\) from the given formula \(\vec{F}=q \vec{B}|\vec{v} \sin \theta|\).

  • Question 9
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    Pressure of a gas increases due to increase of its temperature because at higher temperature:

  • Question 10
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    A pure inductor of 25.0 mH is connected to a source of 220 V. Find the inductive reactance and rms current in the circuit if the frequency of the source is 50 Hz.

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