CBSE Questions for Class 10 Physics Magnetic Effects Of Electric Current Quiz 8 - MCQExams.com

Match the following:
Section ASection B
$$1$$. Fuse$$P.$$ Converts electric energy into mechanical energy
$$2$$ Electric generator$$Q.$$ Heating effect of electric current
$$3.$$ Electric motor$$R.$$ Converts mechanical energy into electrical energy
  • $$1 - Q, 2 - R, 3 - P$$
  • $$1 - Q, 2 - P, 3 - R$$
  • $$1 - P, 2 - Q, 3 - R$$
  • $$1 - P, 2 - R, 3 - Q$$
Current is flowing through a conductor and creates a magnetic field. Assume that this is the only source of the magnetic field. Reversing a current in a straight conductor with no change to the magnitude(ampere value) will cause a _________. 
  • Reduction in the magnetic field
  • Disappearance of the magnetic field
  • Reversal of the direction of the magnetic field
  • Reversal and reduction of the magnetic field
Maximum iron filings stick to the middle of a bar magnet when it is brought near them.
  • True
  • False
State whether true or false.

A cylindrical magnet has only one pole.
  • True
  • False
In Fleming's left hand rule, thumb shows direction of
  • Current
  • Field
  • Motion
  • Charge
In the given diagrams, compasses are used to plot the magnetic field around a bar magnetic field around a bar magnet with poles marked N (North) and S (South). Which of the following diagrams correctly shows the expected field pattern?
The magnetic lines of force inside a bar magnet.
  • Are from S-pole to N-pole
  • Are from N-pole to S-pole
  • Depends on teh cross-sectional area of magnet
  • Do not exist
Magnetic field outside a solenoid is:
  • Zero
  • Strong
  • Infinite
  • Negligible
The magnetic field around a current-carrying coil lasts
  • For three hours
  • As long as current flows through it
  • Till its half-life period
  • Field is permanent
Why is the switch for any electrical appliance always fitted on to the live wire ? 
  • No current flows in the neutral wire.
  • There will be a short circuit if the switch is in the earth lead.
  • The device can never be switched off if the switch is in the neutral lead.
  • The device can only be isolated if the switch is in the live lead
If we reverse direction of electric current, then direction of magnetic field will be:
  • Reversed
  • Remains same
  • Becomes Tangent
  • Becomes Normal
The magnetic field around a current carrying coil.
  • Lasts for three hours
  • Lasts as long as current flows through it
  • Lasts till its half-life period
  • Is permanent
Household appliances are usually not connected in series because:
  • Power consumption would be very much greater
  • A fuse would blow as soon as one appliance is used
  • Switching off an appliance would switch off the rest
  • The appliances would get damaged due to high current
The resulting magnetic field at the point O due to the current carrying wire shown in the figure:
1020562_9b1e7e29db6d4b71bc26955dbe541fcb.png
  • Points out of the page
  • Points into the page
  • Is zero
  • Is the same as due to the segment WX along.
The diagram shows an extra lamp wired into an existing $$220$$ $$V\ A.C.$$ lighting system. To operate extra lamp independently a switch should be placed at.
810360_2758cfdab1a448db871e46efbd21ba4b.png
  • $$1$$
  • $$2$$
  • $$3$$
  • $$4$$
The line that draws power supply to your house from Street has
  • $$220\sqrt{2}$$ average voltage.
  • 220 V average voltage
  • voltage and current Out of phase by $$\pi/2$$
  • voltage and current possibly differing in phase $$\phi$$ such that $$| \phi| < \dfrac{\pi}{2}.$$
A long straight wire carries a current along the x-axis. Consider the points A(0, 1, 0), B( 0, 1, 1) C(1, 1, 1) D(1,1,0) Which of the following pairs of points will have magnetic fields of the same magnitude?
  • A and D
  • A and C
  • B and C
  • B and D
A length of wire carries a steady current. It is bent first to form a circular plane coil of one turn. The same length is now bent more sharply to give a double loop of smaller radius. The magnetic field at the centre caused by the same current is
  • Quarter of its first value
  • Unaltered
  • Four times of its first value
  • Half of its first value
A square loop $$ABCD$$ of side 'a' carrying current $$I$$ is folded about an axis passing through its centre (y-Axis). The two halves are inclined at angle $$30^{\circ}$$ with $$xy$$ plane as shown. Find the magnetic field at origin. The origin coincides with the centre of loop. 
1069367_8ace9d66a892415193575a6fbe18c42a.jpg
  • $$\frac{\mu_0 l \sqrt 3}{\sqrt 2 \pi a}$$
  • $$\frac{\mu_0 l \sqrt 3}{2\sqrt 2 \pi a}$$
  • $$\frac{3\mu_0 l}{2\sqrt 2 \pi a}$$
  • $$\frac{\sqrt 6 \mu_0 l}{\pi a}$$
A charge particle is moving in the direction of a magnetic field.The magnetic force acting on the particle:
  • is in the direction of its velocity
  • is in the direction opposite to its velocity
  • is perpendicular to its velocity
  • is zero
An alternating current is that current which changes regularly its
  • Magnitude
  • Direction
  • Both a and b
  • None of the above
The phenomena of a electromagnetic induction is
  • The process of charging a body
  • The process of generating magnetic field due to current passing through a coil
  • Producing induced current in a coil due to relative motion between a magnet and a coil
  • All the above
Fleming's left hand rule is used to find
  • Direction of magnetic field 
  • Direction of current
  • Direction of magnetic force acting on conductor
  • None of these
 A current is flowing in electricity line towards north, the direction of magnetic field at a point which is just below the line is :
  • towards north
  • towards south
  • towards east
  • towards west
In ______ appliance Fleming Left Hand rule is not used.
  • Electric fan
  • Mixer
  • Computer
  • Electric generator
A DC current flows through a vertical wire in the downward direction. For an observer looking at the wire, the direction of magnetic field at a point between him and the wire is:
  • Upward
  • To the right
  • To the left
  • Downward
The shape of a magnetic field lines around a straight current carrying conductor is.......
  • Circular
  • Straight line
  • Curved
  • Parabolic
A soft bar is inserted inside a current carrying solenoid. The magnetic field inside the solenoid.
  • Will decrease
  • Will incresae
  • Will become zero
  • Will remain the same

The magnetic field lines in the middle of the solenoid are :
  • circles
  • parallel to the axis
  • spirals
  • perpendicular to the axis
A magnetic field lines due to a straight wire carrying a current are
  • Straight
  • Circular
  • Parabolic
  • Elliptical
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