TEST SERIES - 67 (II)

1 volt equals

• 1 J

• 1 J / C

• 1 C / J

• None of the above

Which of the following properties is processed by the ferromagnetic substance?

• Directional property

• Alternating magnetic substance

• Hysterasis

• Susceptability

An electron is projected in the magnetic field along the lines of force

• There will be no effect on the motion of the electron

• The electron speed will increase but the direction will not change

• The electron speed will decrease but direction will not change

• None of the above

The unit of magnetic induction is

• Weber/m2

• Weber/meter

• Weber

• None of the above

A choke coil has

• High inductance and high resistance

• High inductance and low resistance

• Low inductance and high resistance

• Low inductance and low resistance

Choke used to limit high frequency AC has

• A paramagnetic core

• A diamagnetic core

• Air core

• Iron core

The mass of a copper wire of resistance R1 and l 1 length is four times the mass of another copper wire of length l 2 and resistance R2.If R1 = R2, which one of the following is correct?

• l 1 = l 2

• l 1 = 4 l 2

• l 1 = 2 l 2

• 2 l 1 = l 2

Which type of cell can be used if a device requires 75 A of current for 15 seconds?

• Simple voltaic cell

• Daniell cell

• Leclanche cell

• Lead-acid cell

A straight horizontal conductor carries a steady electric current from South to North. Which one of the following events would happen if a small magnetic compass is placed just above the wire?

• The needle remains perpendicular to the conductor

• The needle remains parallel to the conductor

• The North pole of the needle is deflected towards East

• The North pole of the needle is deflected towards West

Soft iron is used in many parts of electrical machines for

• Low hysteresis loss and low permeability

• High hysteresis loss and low permeability

• Low hysteresis loss and high permeability

• High hysteresis loss and high permeability