Electricity Test

Result

Electricity Test - 4

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Weekly Quiz Competition

Question 1
1 / -0

The north pole of a magnet is brought near a stationary positively charged conductor. The north pole exerts a force, which will

A
attract the conductor

B
try to repel

C
not affect the conductor at all

D
repel the north pole itself

Solution

The north pole of a magnet is brought near a stationary positively charged conductor. The north pole exerts a force, which will not affect the conductor at all
Question 2
1 / -0

A cylindrical bar magnet is kept along the axis of a circular coil. If the magnet is rotated about its axis, then

A
current will be induced in the coil

B
no current will be induced in the coil

C
both emf and current will be induced in the coil

D
None of the above

Solution

As the magnetic flux linked with the coil is not changing, so no emf will be induced. An induced emf is zero. So, the current in the coil will be zero.
Question 3
1 / -0

A transformer is used

A
to transform electric energy into mechanical energy

B
to obtain suitable dc voltage

C
to transform ac into dc

D
to obtain suitable ac voltage

Solution

A transformer is used to obtain suitable ac voltage
Question 4
1 / -0

The direction of magnetic field at a point due to an infinitely long wire carrying current is

A
parallel to the current

B
anti-parallel to the current

C
along the perpendicular drawn from a point on the wire

D
perpendicular to the plane containing the conductor and the point

Solution

The direction of magnetic field at a point due to an infinitely long wire carrying current is perpendicular to the plane containing the conductor and the point
Question 5
1 / -0

Charge Q is divided into two parts, which are then kept some distance apart. The force between them will be the highest, if the two parts are

A
Q/2 each

B
Q/4 and 3Q/4

C
Q/3 and 2Q/3

D
e and (Q–e)

Solution

Charge Q is divided into two parts, which are then kept some distance apart. The force between them will be the highest, if the two parts are Q/2 each.The charge will be equally divided.
Question 6
1 / -0

Power is transmitted from a power house on high voltage AC because

A
the rate of transmission is faster at high voltage

B
it is more economical due to less power wastage

C
the life of the current carrying wire is prolonged

D
of precaution against the theft of transmission - line

Solution

Power is transmitted from a power house on high voltage AC because it is more economical due to less power wastage
Question 7
1 / -0

DC can be converted into AC with the help of

A
rectifier

B
regulator

C
transformer

D
inverter

Solution

DC can be converted into AC with the help of inverter
Question 8
1 / -0

Molten sodium chloride conducts electricity due to the presence of

A
free electrons

B
free ions

C
free molecules

D
free atoms of Na and Cl

Solution

Molten sodium chloride conducts electricity due to the presence of free ions.
Question 9
1 / -0

A small piece of unmagnetised substance gets repelled when it is brought near a powerful magnet. The substance can be

A
paramagnetic

B
ferromagnetic

C
non – magnetic

D
diamagnetic

Solution

A small piece of unmagnetised substance gets repelled when it is brought near a powerful magnet. The substance can be diamagnetic

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Re-Attempt Weekly Quiz Competition

Electricity Test - 4

Result

Electricity Test - 4

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SHARING IS CARING

Question 1

attract the conductor

try to repel

not affect the conductor at all

repel the north pole itself

Solution

Question 2

current will be induced in the coil

no current will be induced in the coil

both emf and current will be induced in the coil

None of the above

Solution

Question 3

to transform electric energy into mechanical energy

to obtain suitable dc voltage

to transform ac into dc

to obtain suitable ac voltage

Solution

Question 4

parallel to the current

anti-parallel to the current

along the perpendicular drawn from a point on the wire

perpendicular to the plane containing the conductor and the point

Solution

Question 5

Q/2 each

Q/4 and 3Q/4

Q/3 and 2Q/3

e and (Q–e)

Solution

Question 6

the rate of transmission is faster at high voltage

it is more economical due to less power wastage

the life of the current carrying wire is prolonged

of precaution against the theft of transmission - line

Solution

Question 7

rectifier

regulator

transformer

inverter

Solution

Question 8

free electrons

free ions

free molecules

free atoms of Na and Cl

Solution

Question 9

paramagnetic

ferromagnetic

non – magnetic

diamagnetic

Solution

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