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Physics Test 24...

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  • Question 1
    4 / -1

    A small soap bubble of radius 4 cm is trapped inside another bubble of radius 6 cm without any contact. Let P2 be the pressure inside the inner bubble and P0 be the pressure outside the outer bubble. Radius of another bubble with pressure difference P2 - P0 between its inside and outside would be

  • Question 2
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    A planet of mass M is revolving around sun in an elliptical orbit. If dA is the area swept in a time dt, angular momentum can be expressed as

  • Question 3
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    A spherical hole is made in a solid sphere of radius R. The mass of the original sphere was M.The gravitational field at the centre of the hole due to the remaining mass is

  • Question 4
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    Directions For Questions

    A cylindrical tank has a hole of diameter 2r in its bottom. The hole is covered wooden cylindrical block of diameter 4r, height h and density ρ/3.

    Situation I : Initially, the tank is filled with water of density ρ to a height such that the height of water above the top of the block is h1 (measured from the top of the block).

    Situation II : The water is removed from the tank to a height h2 (measured from the bottom of the block), as shown in the figure.

    The height h2 is smaller than h (height of the block) and thus the block is exposed to the atmosphere.

    ...view full instructions

    Find the minimum value of height h1 (in situation 1), for which the block just starts to move up?

  • Question 5
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    If the elastic limit of copper is 1.5 × 108 N/ m2, determine the minimum diameter a copper wire can have under a load of 10.0 kg if its elastic limit is not to be exceeded.

  • Question 6
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    At what temperature is the r.m.s velocity of a hydrogen molecule equal to that of an oxygen molecule at 47°C?

  • Question 7
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    Heat generated through a resistive wire will increase _______ times in unit time, if current in the wire becomes twice.

  • Question 8
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    The frequency (n) of vibration of a string is given as  where T is tension and l is the length of vibrating string. Then, the dimensional formula for m is

  • Question 9
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    Three particles A, B and C are situated at the vertices of an equilateral triangle of side l at t = 0. The particle A heads towards B, B towards C, C towards A with constant speeds v. Find the time of their meeting.

  • Question 10
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    The P−V equation for a process of an ideal gas is given as

    The graphical representation of the above process is shown as

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