Term 1 Five Mark Model Questions

12th Standard EM

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Physics

Time : 01:00:00 Hrs
Total Marks : 25
    5 x 5 = 25
  1. When two objects are rubbed with each other, approximately a charge of 50 nC can be produced in each object. Calculate the number of electrons that must be transferred to produce this charge.

  2. Two electric bulbs marked 20 W – 220 V and 100 W – 220 V are connected in series to 440 V supply. Which bulb will be fused?

  3. What is the value of x when the Wheatstone’s network is balanced?
    P = 500 Ω, Q = 800 Ω, R = x + 400, S = 1000 Ω

  4. A cell supplies a current of 0.9 A through a 2 Ω resistor and a current of 0.3 A through a 7 Ω resistor. Calculate the internal resistance of the cell.

  5. In a plane Electromagnetic wave the electric field oscillates sinusoidally at a frequency of 1.5 X 1010Hz & amplitude 36 Vm-1.
    (i) What is the wavelength of a wave?
    (ii) What the amplitude of the oscillating magnetic field?
    (iii) Straight the average energy density of the electric field \(\left( \overrightarrow { E } \right) \) , is equal to average energy density of the magnetic field \(\left( \overrightarrow { B } \right) \)

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