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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
When a magnet is cut lengthwise into equal parts, the strength of each part becomes half. The polarity of a solenoid can be identified using
(a) a compass needle
(b) the right-hand thumb rule
(c) Fleming’s left-hand rule
(d) either option (a) or (b)
Option d – either option (a) or (b)
The magnetic field strength produced by a current-carrying solenoid is influenced by
(a) the amount of current
(b) the number of turns in the coil
(c) the material inside the core
(d) all the mentioned factors
Option d – all the mentioned factors
Placing a soft iron rod inside a solenoid carrying current will cause the magnetic field
(a) to reduce
(b) to remain unchanged
(c) to become stronger
(d) to drop to zero
Option c – to become stronger
Which statement about magnetic field lines is incorrect?
(a) They always form closed loops
(b) They never cross each other
(c) The direction of the magnetic field at any point is given by the tangent to the field line
(d) Outside a magnet, they go from the south pole to the north pole
Option d – Outside a magnet, they go from the south pole to the north pole
What device helps in detecting the presence of a magnetic field?
(a) Magnetic needle
(b) Ammeter
(c) Galvanometer
(d) Voltmeter
Option a – Magnetic needle
The magnetic field around a straight current-carrying conductor forms a pattern that is
(a) opposite to the direction of current
(b) aligned with the wire
(c) circular around the wire
(d) in the same direction as the current
Option c – circular around the wire
The intensity of the magnetic field near a wire with current is
(a) inversely related to current, and directly related to the square of the distance from the wire
(b) directly related to current, and inversely related to the distance from the wire
(c) directly related to distance, and inversely related to current
(d) directly related to current, and inversely related to the square of the distance
Option b – directly related to current, and inversely related to the distance from the wire
A current flows through a horizontal wire from south to north. The magnetic field 0.5 m above it points toward
(a) North
(b) South
(c) West
(d) East
Option a – North
At the center of a circular loop carrying current, the magnetic field is
(a) circular
(b) elliptical
(c) parabolic
(d) straight
Option d – straight
The working principle of an A.C. generator is based on
(a) Ohm’s law
(b) Joule’s heating law
(c) Faraday’s law of electromagnetic induction
(d) none of these
Option c – Faraday’s law of electromagnetic induction
Fleming’s left-hand rule and right-hand rule are applied in
(a) Generator and motor
(b) Motor and generator
(c) Either rule applies to both devices
(d) Neither applies to any of them
Option b – Motor and generator
Inside a magnet, magnetic field lines flow from
(a) north to south
(b) south to north
(c) outward from the south pole
(d) outward from the north pole
Option a – north to south
What shows the relative intensity of a magnetic field at a point in space?
(a) Length of the magnet
(b) Thickness of the magnet
(c) Closeness of the field lines
(d) Resistance of the Environment
Option a – Length of the magnet
Which gases are commonly used in electric bulbs?
(a) Helium and Neon
(b) Neon and Argon
(c) Argon and Hydrogen
(d) Argon and Nitrogen
Option d – Argon and Nitrogen
Who first discovered the magnetic effect of electric current?
(a) Oersted
(b) Faraday
(c) Bohr
(d) Ampere
Option a – Oersted
How can an electric current be induced in a coil?
(a) Moving the coil within a magnetic field
(b) Changing the magnetic field around the coil
(c) Rotating the coil in the field
(d) All of the above
Option a – Moving the coil within a magnetic field
When a magnet is moved quickly versus slowly towards a coil, the induced voltage is
(a) higher when moved quickly
(b) higher when moved slowly
(c) same in both cases
(d) not predictable
Option a – higher when moved quickly
The operating principle of an A.C. generator involves
(a) the force on a conductor in a magnetic field
(b) electromagnetic induction
(c) Electrostatics
(d) the force on a charged particle in an Electric Field
Option a – the force on a conductor in a magnetic field
If the direction of current is parallel to the magnetic field, the force on the conductor will be
(a) twice the force when the angle is 60°
(b) three times the force when the angle is 60°
(c) zero
(d) infinite
Option a – twice the force when the angle is 60°
A positive charge rising in a magnetic field directed north will experience a force toward
(a) west
(b) north
(c) south
(d) east
Option a – west
What affects the force on a current-carrying conductor in a magnetic field?
(a) Strength of the magnetic field
(b) Amount of current in the wire
(c) Length of conductor within the field
(d) All of the above
Option d – All of the above
What determines the direction in which the coil in an electric motor rotates?
(a) Fleming’s right-hand rule
(b) Fleming’s left-hand rule
(c) Faraday’s law of induction
(d) None of the above
Option b – Fleming’s left-hand rule
In an electric motor, the component that reverses current every half turn to keep the rotation going is called
(a) carbon brush
(b) commutator
(c) slip ring
(d) armature
Option b – commutator
For electromagnetic induction to occur, there must be relative motion between
(a) a galvanometer and a magnet
(b) a wire coil and galvanometer
(c) a wire coil and a magnet
(d) a magnet and galvanometer
Option c – a wire coil and a magnet
The device used to detect electric current in a circuit is
(a) electric motor
(b) A.C. generator
(c) galvanometer
(d) none of these
Option a – electric motor
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