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

State whether the following statements are 'true' or 'false':
An electric motor converts mechanical energy into electrical energy.
  • True
  • False
State whether the following statements are 'true' or 'false':
A wire with a green insulation is usually the live wire of an electric supply.
  • True
  • False
Which of the following correctly describes the magnetic field near a long straight wire?
  • The field consists of straight lines perpendicular to the wire.
  • The field consists of straight lines parallel to the wire.
  • The field consists of radial lines originating from the wire.
  • The field consists of concentric circles centred on the wire..
The device used for producing electric current is called a
  • generator
  • galvanometer
  • ammeter
  • motor
Electromagnetic induction is
  • Charging a substance.
  • Process of developing a magnetic field around a coil by passing electricity through a coil
  • Process of rotating the armature of a generator
  • Process of making electricity by the relative motion of a magnet or a coiled conductor.
The field at the center of a long circular coil carrying current will be parallel straight lines.
  • True
  • False
Magnetic field lines are __________.
  • open curves
  • closed curves
  • Both A & B
  • None of the above
Magnetic field lines cross each other.
  • True
  • False
Magnetic field has ________.
  • velocity and direction.
  • temperature and direction.
  • magnitude and direction.
  • current and direction.
Arun suspended a bar magnet on a string as shown in the diagram below. He brought $$3$$ bar-shaped objects $$P,\ Q,$$ and $$R$$ towards the bar magnet. He placed the ends ($$X$$ and $$Y$$) of each object, near the north pole of the bar magnet and recorded his observations in the table below.
Object$$X $$ brought near to $$N$$ pole$$Y$$ brought near to $$N$$ pole
$$P$$N pole repelled$$N$$ pole attracted
$$Q$$N pole attracted$$N$$ pole attracted
$$R$$N pole stationary$$N$$ pole remains stationary

Which of the object(s) is/are a magnet?

794277_20050430efe74c10b8775d59957c9b00.png
  • $$P$$ only
  • $$R$$ only
  • $$P$$ and $$R$$
  • None of these
What will happen when three bar magnets are hung in the manner as shown below?
794061_b2f8ac520b684019b5c78a5433faddb1.png
  • Nothing will happen
  • Magnet Y will turn round and round
  • Magnet Y will move towards magnet Z
  • Magnet Y will move towards magnet X.
Magnetic lines of force always cross each other.
  • True
  • False
A long current carrying wire PQ is free to move when placed in a magnetic field B at right angles to the wire, as shown. Then
799947_566ac25439604cec80af9683d6429882.jpg
  • It will move along the magnetic field to the right
  • It will move upwards,towards the observer
  • It will move downwards, away from the observer
  • It will not move at all.
The green colour insulated wires used for:
  • Live wire
  • Neutral wire
  • Earth wire 
  • None of these
In the given diagrams, compasses are used to plot the 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?
If you place a compass near a current conducting wire, it will:
  • Get deflected
  • Get charged
  • Get hot
  • Glow brightly
Study the arrangement of three bar magnets as shown below. Which arrangement is possible?
A magnetic compass shows a deflection when placed near a current-carrying wire. If the current in the wire is increased, how does the deflection of the compass get affected?
  • Increase
  • Decrease
  • Remain Same
  • Insufficient Data
In the given diagram, when the magnet is pushed in to the solenoid, the pointer of the galvanometer defects slightly to the left.
which of the flowing would produce a defection of the pointer towards the right?
800954_412b14e4496b463e8f5fac10cf752e33.jpg
  • Move the solenoid towards the magnet.
  • Move the solenoid away from the magnet.
  • Move the magnet faster into the solenoid.
  • By placing the magnet above the coil.

What is the type of field line of a magnetic field passing through the centre of current carrying circular ring?
  • Circular
  • Straight lines
  • Ellipse
  • Magnetic field is zero at centre
Two mutually perpendicular conductors carrying currents $$I_1$$ and $$I_2$$ lie in one plane. If $$I_1$$ is taken along x-axis and $$I_2$$ along y-axis, the locus of points where magnetic induction is zero is
1020766_2de3a7d46b214bdf8fbf0f2afccb54e2.png
  • A straight line passing through origin and having slope $$I_1/I_2$$
  • A straight line passing through origin and having slope- $$I_1/I_2$$
  • A circle
  • A hyperbola
A long straight vertical wire carries a current of $$10$$ amperes flowing upwards through it at a place, where the horizontal component of the earth's magnetic field is
$$0.3$$ gauss. Then the total magnetic field at a point 5 cm from the wire due magnetic north of the wire is:
  • $$0.7$$ gauss
  • $$0.5$$ gauss
  • $$0.1$$ gauss
  • $$0.4$$ gauss
Two parallel long wires A and B carry currents $$i_1$$ and $$i_2 ( < i_1)$$. When $$i_1$$ and $$i_2$$ are in same direction, the magnetic field at a point mid-way between the wires is $$10 \mu T$$. if $$i_2$$ is reverse the field becomes $$30\mu T$$ the ratio $$i_1 /i_2$$ is
  • $$1$$
  • $$4$$
  • $$3$$
  • $$2$$
Electricity flows through a very long solenoid. Some statements are given below related to the magnitude of the magnetic field developed inside the coil. Find out the correct ones and write them down. 
  • It is zero
  • It will be the same at all points
  • It gradually decreases towards the ends.
  • It gradually increases towards the ends.
Three similar bar magnets are placed from an equilateral as shown in fig ,The magnetic moment of each magnet is M . What is the  magnitude of magnetic moment of the system ?
1943003_a7a38a87ffbe47eb93c2189fec11a77d.PNG
  • M
  • zero
  • 2 M
  • M/2
The direction of magnetic field in a bar magnet is
  • South pole to north pole
  • North pole to south pole
  • South pole to east pole
  • North pole to west pole
The magnetic field is strongest at
  • the middle of the magnet
  • the north pole
  • the south pole
  • both the poles.
What is a Magnetic Field?
  • A space around the magnet where its force can be experienced.
  • A space where magnets are found.
  • Both A & B
  • None of the above
If a bar magnet is cut into 'n' pieces, how many poles will each magnet have?
  • 1
  • 2
  • 0
  • n
The lines along which the iron filings align themselves around a bar magnet represent magnetic field lines.
  • True
  • False
0:0:1


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