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Physics Test - 14

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Physics Test - 14
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  • Question 1
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    Ratio of longest wavelengths corresponding to Lyman and Balmer series in hydrogen spectrum is
  • Question 2
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    A metal surface is illuminated by light of two different wavelengths 248 nm and 310 nm. The maximum speeds of the photoelectrons corresponding to these wavelengths are u1 and u2, respectively. If the ratio u1 : u2 = 2 : 1 and hc = 1240 eV nm, the work function of the metal is nearly
  • Question 3
    1 / -0
    The upper half of an inclined plane of inclination θ is perfectly smooth while lower half is rough. A block starting from rest at the top of the plane will again come to rest at the bottom, if the coefficient of friction between the block and lower half of the plane is given by
  • Question 4
    1 / -0
    A current loop in a magnetic field
  • Question 5
    1 / -0
    In an experiment four quantities a, b, c and d are measured with percentage error 1%, 2%, 3% and 4% respectively. Quantity P is calculated as follows : P = a^3 b^2/cd % error in P is
  • Question 6
    1 / -0
    A small object of uniform density rolls up a curved surface with an initial velocity v′. It reaches up to a maximum height of 3v^2 /4g with respect to the initial position. The object is
  • Question 7
    1 / -0
    For photoelectric emission from certain metal the cut-off frequency is ν. If radiation of frequency 2ν impinges on the metal plate, the maximum possible velocity of the emitted electron will be (m is the electron mass)
  • Question 8
    1 / -0
    An explosion breaks a rock into three parts in a horizontal plane. Two of them go off at right angles to each other. The first part of mass 1 kg moves with a speed of 12 ms^–1 and the second part of mass 2 kg moves with 8 ms^–1 speed. If the third part flies off with 4 ms^–1 speed, then its mass is
  • Question 9
    1 / -0
    Infinite number of bodies, each of mass 2 kg are situated on x-axis at distance 1 m, 2 m, 4 m, 8 m, .....respectively, from the origin. The resulting gravitational potential due to this system at the origin will be
  • Question 10
    1 / -0
    The wettability of a surface by a liquid depends primarily on
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