1:   A galvanometer of 50 ohms is connected with a battery of 3V such that a resistor of 2950 ohms is connected in series with it. In this condition, the galvanometer shows full-scale deflection (scale has 30 divisions). To obtain full-scale division for 20 division scale the required resistance is ----- ohms
Options:
  1. 5050
  2. 5550
  3. 6050
  4. 4450

Answer: Option 4

Explanation:

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2:   A particle of charge Q, mass m and kinetic energy T enters in a transverse constant magnetic field. The kinetic energy of the particle after 3 seconds will be
Options:
  1. 3T
  2. 2T
  3. T
  4. 4T

Answer: Option 3

Explanation:

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3:   A charged particle q is moving in a circle of radius R wit uniform speed V. The associated magnetic moment u is given by
Options:
  1. qvR/2
  2. qvR^2
  3. qvR^2/3
  4. qvR

Answer: Option 1

Explanation:

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4:   A charged particle is moving with constant velocity v in a circular path of radius R under the influence of constant magnetic field. The time interval of this motion
Options:
  1. depends on v but does not depends on R
  2. depends on R and v both
  3. does not depend on R and v
  4. depends on R but not on v

Answer: Option 3

Explanation:

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5:   Two circular coils 1 and 2 are made of same wire but the radius of first coil is twice that of second coil. What would be the ratio of potential difference applied across the coils if the magnetic field at their centres are same
Options:
  1. 3
  2. 4
  3. 6
  4. 2

Answer: Option 2

Explanation:

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6:   An electron moves with a velocity v in a circular orbit. It produces magnetic field B at the centre of circle. The radius of circle is directly proportional to the
Options:
  1. B/v
  2. v?B
  3. root v / root B
  4. root B / root v

Answer: Option 3

Explanation:

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7:   In a galvanometer of resistance 50 ohm, the number of divisions are 25 current of 4 X 10^-4 gives one division deflection. If it is to be converted to a voltmeter of range 25 volt, then it should be equipped with shunt of ------------- ohm.
Options:
  1. 2500
  2. 245
  3. 2550
  4. 2450

Answer: Option 4

Explanation:

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8:   A long solenoid produces a magnetic field B at its axis. If the current flowing through it is doubled and number of turns are halved then magnetic field will be
Options:
  1. 2B
  2. 4B
  3. B/2
  4. B

Answer: Option 4

Explanation:

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9:   A charged particle is moving perpendicular to the magnetic field, then
Options:
  1. its acceleration remains constant
  2. its velocity remains unchanged
  3. its speed remains unchanged
  4. its direction of motion remains unchanged

Answer: Option 3

Explanation:

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10:   An electron enters in a magnetic field of 0.3 T with velocity 1 X 10^3 m/sec at angle 30 degree. if for electron e/m=1.76 x 10^11 c/kg, then the radius of path of electron will be -------------- m.
Options:
  1. 10^-8
  2. 2 X 10^-8
  3. 10^-6
  4. 10^-10

Answer: Option 1

Explanation:

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