Class 7 Science Chapter 14 MCQ. We covered all the Class 7 Science Chapter 14 MCQ in this post for free so that you can practice well for the exam.
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MCQ on General Science for Class 7 Students
The strength of each magnet reduces to half when it is cut along its length into the equal parts magnetic field strength of a solenoid. The polarity of the solenoid can be determined by
(a) the use of a compass needle
(b) Right-hand thumb rule
(c) the fleming left-hand rule
(d) either (a) or (b)
Option d – either (a) or (b)
The factors on which one magnetic field strength produced by current-carrying solenoids depends are
(a) Magnitude of current
(b) Number of turns
(c) Nature of core material
(d) All of the above
Option d – All of the above
A soft iron bar is introduced inside the current-carrying solenoid. The magnetic field inside the solenoid
(a) will decrease
(b) will remains the same
(c) will increase
(d) will become zero
Option c – will increase
Which of the following statement is not correct about the magnetic field?
(a) Magnetic field lines form a continuous closed curve.
(b) Magnetic field lines do not interest each other.
(c) The direction of the tangent at any point on the magnetic field line curve gives the direction of the magnetic field at that point.
(d) Outside the magnet, magnetic field lines go from the South to the North pole of the magnet.
Option d – Outside the magnet, magnetic field lines go from the South to the North pole of the magnet
By which instrument, the presence of a magnetic field be determined?
(a) Magnetic Needle
(b) Ammeter
(c) Galvanometer
(d) Voltmeter
Option a – Magnetic Needle
The pattern of the magnetic field produced by the straight current carrying conducting wire is
(a) in the direction opposite to the current
(b) in the direction parallel to the wire
(c) circular around the wire
(d) in the same direction as current
Option c – circular around the wire
The strength of the magnetic field around a current-carrying conductor is
(a) inversely proportional to the current but directly proportional to the square of the distance from the wire.
(b) directly proportional to the current and inversely proportional to the distance from the wire.
(c) directly proportional to the distance and inversely proportional to the current
(d) directly proportional to the current but inversely proportional to the square of the distance from the wire.
Option b – directly proportional to the current and inversely proportional to the distance from the wire
A current through a horizontal power line flows from the south to the North direction. The direction of the magnetic field line 0.5m above it is
(a) North
(b) South
(c) West
(d) East
Option a – North
The nature of the magnetic field line passing through the center of the current-carrying circular loop is
(a) circular
(b) ellipse
(c) parabolic
(d) straight line
Option d – straight line
AD.C generator works on the principle of
(a) ohnis law
(b) Joule’s law of heating
(c) faraday’s law of electromagnetic induction.
(d) none of the above
Option c – faraday’s law of electromagnetic induction
Fleming’s left-hand and Right-hand rules are used in
(a) Generator and electric motor
(b) Electric motor and generator
(c) any rule can be used for any device
(d) both are not applied for the generator and motor.
Option b – Electric motor and generator
Inside the magnet, the field lines move
(a) from north to south
(b) from south the north
(c) away from the south pole
(d) away from the north pole
Option a – from north to south
The relative strength of the magnetic field at a point in the space surrounding the magnet is shown by the
(a) length of magnet
(b) thickness of magnet
(c) degree of closeness to the field.
(d) the resistance offered by the surroundings
Option a – length of magnet
Which of the following gases are filled in electric bulbs?
(a) Helium and Neon
(b) Neon and Argon
(c) Argon and Hydrogen
(d) Argon and Nitrogen
Option d – Argon and Nitrogen
The magnetic effect of current was discovered by
(a) Oersted
(b) Faraday
(c) Bohr
(d) Ampere
Option a – Oersted
We can induce the current in a coil by
(a) moving the coil in a magnetic field
(b) by changing the magnetic field around it
(c) by changing the orientation of the coil in the magnetic field
(d) All of above
Option a – moving the coil in a magnetic field
A magnet is moved towards a coil (i) quickly (ii) slowly. The induced potential difference
(a) more in (i) than in (ii) case
(b) more in (ii) than in (i) case
(c) same in both
(d) can’t say
Option a – more in (i) than in (ii) case
A.C generator works on the principle of
(a) the force experienced by a conductor in the magnetic field
(b) electromagnetic induction
(c) electrostatic
(d) the force experienced by a charged particle in an electric field.
Option a – the force experienced by a conductor in the magnetic field
When the current is parallel to a magnetic field, then the force experienced by the current-carrying conductor placed in the uniform magnetic field is
(a) Twice to that when the angle is 60°
(b) Thrice to that when the angle is 60°
(c) zero
(d) infinite
Option a – Twice to that when the angle is 60°
A positive charge is moving upwards in a magnetic field directed towards the north. The particle will be deflected towards
(a) west
(b) north
(c) south
(d) east
Option a – west
Which of the following factors affect the strength of force experienced by a current-carrying conduct in a uniform magnetic field?
(a) magnetic field strength
(b) the magnitude of current in a conductor
(c) length of the conductor within the magnetic field
(d) All of the above.
Option d – All of the above
The direction of rotation of a coil in an electric motor is determined by ( Class 7 Science Chapter 14 MCQ )
(a) fleming’s right-hand rule
(b) fleming’s left-hand rule
(c) faraday’s law of electromagnetic inductors
(d) None of above
Option b – fleming’s left-hand rule
In an electric motor, to make the coil rotate continuously in the same direction, the current is reversed in the coil after every half rotation by a device called
(a) carbon brush
(b) commutator
(c) slip ring
(d) armature
Option b – commutator
The condition for the praenomen of electromagnetic induction is that there must be a relative motion between
(a) the galvanometer and magnet
(b) the coil of wire and galvanometer
(c) the coil of wire and magnet
(d) the magnet and galvanometer
Option c – the coil of wire and magnet
The instrument that is used to detect electric current in the circuit is known as ( Class 7 Science Chapter 14 MCQ )
(a) electric motor
(b) A.C generator
(c) galvanometer
(d) none of the above
Option a – electric motor
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