Electricity and Magnetism Class 7 ICSE. We covered all the Electricity and Magnetism Class 7 ICSE in this post for free so that you can practice well for the exam.
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Mock Test on Electricity and magnetism for Class 7 Students
A conducting wire is dropped along the East-West direction, then
(a) no emf is induced.
(b) no induced current flows.
(c) induced current flows from West to East.
(d) induced current flows from East to West.
Option c – induced current flows from West to East
The self-inductance of a Solenoid is
(a) directly proportional to the current flowing through the coil.
(b) directly proportional to its length.
(c) directly proportional to the area of the cross-section.
(d) inversely proportional to the area of the cross-section.
Option c – directly proportional to the area of the cross-section
Mutual inductance of a few coils can be increased by
(a) decreasing the number of turns in the coil.
(b) increasing the number of turns in the coils.
(c) winding the coils on a wooden core.
(d) None of the above
Option b – increasing the number of turns in the coils
Assertion (A) Eddy current is produced in any metallic conductor when the magnetic flux is changed around it. Reason (R) Electric potential determines the flow of charge. Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option b – Both A and R are true, but R is not the correct explanation of A
In an electrical motor
(a) heat is converted into electrical energy.
(b) electrical energy is converted into heat.
(c) electrical energy is converted into mechanical energy.
(d) mechanical energy is converted into electrical energy.
Alternating current can not be measured by DC ammeter because
(a) AC cannot pass through a DC ammeter.
(b) the average value of the complete cycle is zero.
(c) AC is virtual.
(d) AC changes its direction.
Option b – the average value of the complete cycle is zero
The ‘Choke’ used with a tube light is basically
(a) an inductor
(b) a capacitor
(c) a transformer
(d) a resistor
Option a – an inductor
Given below are two statements, one labeled as Assertion (A) and the other labeled as Reason (R). Assertion (A) Transformer is useful for stepping up or stepping down voltages. Reason (R) Transformer is a device used in DC circuits. In the context of the above two statements, which one of the following is correct? Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
Option c – A is true, but R is false
Which of the following is the purpose for which a transformer is used?
(a) To convert AC into DC
(b) To convert DC into AC
(c) To step-up or step-down AC voltage
(d) To step-up DC voltage
Option c – To step-up or step-down AC voltage
In a step-down transformer, the AC output gives the
(a) current more than the input current.
(b) current less than the input current.
(c) current equal to the input current.
(d) voltage more than the input voltage.
Option a – current more than the input current
After using it for some time, big transformers get heated up. This is due to the fact that I. current produces heat in the transformers. II. hysteresis loss occurs in the transformers. III. the liquid used for cooling gets heated. Select the correct answer using the codes given below.
(a) Only I
(b) II and III
(c) I and II
(d) I, II, and III
Option c – I and II
A rectangular coil of copper wire is rotating in a magnetic field. The direction of the induced current changes once in each.
(a) Two revolutions
(b) One revolution
(c) Half revolution
(d) One-fourth revolution
Option c – Half revolution
(a) Only I and II
(b) Only I and III
(c) Only I and III
(d) All statements are correct
Option d – All statements are correct
If the speed of a moving magnet inside a coil increases, the electric current in the coil
(a) increases
(b) decreases
(c) reverses
(d) remains the same
Option a – increases
When the direction of motion of the coil is perpendicular to the electromagnetic field, then the value of induced current is ……..
(a) minimum
(b) maximum
(c) neither minimum nor maximum
(d) No option is correct
Option b – maximum
Faraday’s Laws are a consequence of conservative of
(a) energy
(b) energy and magnetic field
(c) charge
(d) magnetic field
Option a – energy
Lenz’s Law is a consequence of the law of conservatives of
(a) charge
(b) momentum
(c) mass
(d) energy
Option d – energy
The device which works on the principle of electromagnetic induction is
(a) an Ammeter
(b) a Voltmeter
(c) a Dynamo
(d) None of these
Option c – a Dynamo
The basic difference between an AC generator and a DC generator is that
(a) an AC generator has an electromagnet while a DC generator has a permanent magnet.
(b) AC generator has slip rings while the DC generator has a commutator.
(c) DC generator will generate a higher voltage.
(d) AC generator will generate a higher voltage.
Option b – AC generator has slip rings while the DC generator has a commutator
The Dynamo core is laminated because
(a) the magnetic field increases.
(b) magnetic saturation level in the core increases.
(c) residual magnetism in the core decreases.
(d) loss of energy in the core due to eddy currents decreases.
Option d – loss of energy in the core due to eddy currents decreases
Which one of the following devices changes low voltage alternating current to high voltage alternating current and vice-versa?
(a) Generator
(b) Motor
(c) Transformer
(d) Vibrator
Option c – Transformer
Step-up transformers are used for
(a) increasing electrical power
(b) decreasing electrical power
(c) decreasing voltage
(d) increasing voltage
Option d – increasing voltage
A mobile phone charger is
(a) an inverter
(b) a ups
(c) a step-up transformer
(d) a step-down transformer
Option d – a step-down transformer
The purpose of choke in a fluorescent lamp is
(a) to increase the current flow.
(b) to decrease the current flow.
(c) to decrease the resistance.
(d) to decrease the voltage momentarily.
Option b – to decrease the current flow
A choke coil has
(a) low inductance and high resistance.
(b) low inductance and low resistance.
(c) high inductance and low resistance.
(d) high inductance and high resistance.
Option c – high inductance and low resistance
A generator converts
(a) mechanical energy into electrical energy.
(b) electrical energy into chemical energy.
(c) thermal energy into electrical energy.
(d) electrical energy into light energy.
Option a – mechanical energy into electrical energy
Which of the following statements is incorrect?
(a) An electric motor converts electrical energy into mechanical energy.
(b) An electric generator works on the principle of electromagnetic induction.
(c) The magnetic field at the center of a long circular coil carrying current will be parallel straight lines.
(d) A wire with green insulation is usually the live wire.
Option d – A wire with green insulation is usually the live wire
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