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  • Question 1
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    An electron moving with a uniform velocity along the positive x-direction enters a magnetic field directed along the positive y-direction. The force on the electron is directed along

  • Question 2
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    A metallic wheel with 8 metallic spokes, each of length r, is rotating at an angular frequency ω in a plane perpendicular to a magnetic field B. The magnitude of the induced emf between the axle and the rim of the wheel is

  • Question 3
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    Directions: The following question has four choices, out of which ONLY ONE is correct.

    When a metallic surface is illuminated by a light of wavelength λ, the stopping potential for the photoelectric current is 3 V. When the same surface is illuminated by a light of wavelength 2λ, the stopping potential is 1 V. The threshold wavelength for this surface is

  • Question 4
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    Two stretched strings of the same material and radius, having lengths 75 cm and 150 cm, are in resonance when they are stretched by masses of 1 kg and 2 kg, respectively. The velocities of transverse waves in these strings are in the ratio

  • Question 5
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    A particle is dropped from the top of a tower. What distance will it cover in the 4th second? (Assume acceleration due to gravity as 10 m/s2)

  • Question 6
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    A power line lies along the East-West direction and carries a current of 10 A. The force per unit length due to the Earth's magnetic field of 10–4 T is

  • Question 7
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    An electrical refrigerator extracts 2000 calories from ice trays. If its coefficient of performance is 4, the work done by the electric motor (in calories) is

  • Question 8
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    In a network of four capacitors where three are connected in series of 5 μF to a 240 V supply, which of the following charges on the fourth capacitor of 5 μF is connected in parallel with the three capacitors ?

  • Question 9
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    An electron moves with a speed of 2×105ms-1along the positive x-direction in a majestic field B = (i - 4j - 3K) tesia. The magnitude of the force (in newtons) experienced by the electron is (change on electron=16×10-19C)

  • Question 10
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    A particle moves in a straight line with retardation proportional to its displacement. Its loss of kinetic energy for any displacement 'x' is proportional to

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