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Physics Test 20...

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  • Question 1
    4 / -1

    If the velocity of a particle moving along a straight line decreases linearly with its displacement from 20  ms−1 to a value approaching zero at s = 30 m, then acceleration of the particle at s = 15 m is

  • Question 2
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    When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx2, where aa and bb are constants. The work done in stretching the unstretched rubber-band by L is :

  • Question 3
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    A square surface of side L metres is in the plane of the paper. A uniform electric field  (volt/m), also in the plane of the paper, is limited only to the lower half of the square surface (see diagram). The electric flux in SI units associated with the surface is

  • Question 4
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    An elastic wire is stretched by 3 cm from its natural length and its potential energy is V. If the wire is stretched by 6 cm from its natural length, its potential energy will be

  • Question 5
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    During adiabatic change, specific heat is

  • Question 6
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    Two rods (one semi-circular and other straight) of the same material and of same cross-sectional area are joined as shown in the diagram. The points A and B are maintained at different temperatures. The ratio of the heat transferred through a cross-section of a semi-circular rod to the heat transferred through a cross-section of the straight rod in a given time is

  • Question 7
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    A cylindrical solid of length L and radius a is having varying resistivity given by ρ = ρ0x where ρ0 is a positive constant and x is measured from the left end of the solid. The cell shown in the figure is having emf V and negligible internal resistance. The electric field as a function of x is best described by:

  • Question 8
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    If K1 and K2 are maximum kinetic energies of photoelectrons emitted when lights of wavelength λ1 and λ2 respectively incident on a metallic surface. If λ1 = 3λ2, then

  • Question 9
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    A lens is made of flint glass (refractive index = 1.5). When the lens is immersed in a liquid of refractive index 1.25, the focal length

  • Question 10
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    Three concentric spherical shells have radii a, b and c (a < b < c) and have surface charge densities σ, −σ and σ respectively. If VA, VB and VC denote the potentials of the three shells, then, for c = a+b, we have

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