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Test: Magnetic Effects of Electric Current - 4 - Class 10 MCQ


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25 Questions MCQ Test Science Class 10 - Test: Magnetic Effects of Electric Current - 4

Test: Magnetic Effects of Electric Current - 4 for Class 10 2024 is part of Science Class 10 preparation. The Test: Magnetic Effects of Electric Current - 4 questions and answers have been prepared according to the Class 10 exam syllabus.The Test: Magnetic Effects of Electric Current - 4 MCQs are made for Class 10 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Magnetic Effects of Electric Current - 4 below.
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Test: Magnetic Effects of Electric Current - 4 - Question 1

The use of fuses in electric power-lines is :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 1

A fuse is used to break the circuit,in order to protect the electrical appliances from damage. In case of overcurrent a fuse melts and breaks the circuit and stops the current flowing through the components. A fuse is made up of a thin material which has a low melting point.

Test: Magnetic Effects of Electric Current - 4 - Question 2

When the main switch of the house circuit is put off, it disconnects the :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 2

The correct option is D.
 In this case when the main switch of the house is switched off it would disconnect the live wire and the neutral wire.

Test: Magnetic Effects of Electric Current - 4 - Question 3

When a fuse is rated at 8 A, it means :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 3

Every fuse has given particular thickness to with stand particular electric current strength, the current value 8A means that the fuse will melt or will burn out if the current passing through the fuse exceeds 8A , other than that the fuse will work fine even if the current supplied lower than that of 8A .

Test: Magnetic Effects of Electric Current - 4 - Question 4

According to International Convention of colour coding of wires used in household electrical circuits :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 4

According to international color coding system in Old colors red is live ( or phase) black is neutral, green/ yellow is earth.

Test: Magnetic Effects of Electric Current - 4 - Question 5

The magnetic field lines inside a current carrying solenoid are :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 5

The magnetic field produced by a current carrying solenoid is similar to the magnetic field produced by a bar magnet. The magnetic field lines inside the solenoid are in the form of parallel straight lines and along the axis of solenoid.

Test: Magnetic Effects of Electric Current - 4 - Question 6

Potential difference between a live wire and the neutral wire is :

Test: Magnetic Effects of Electric Current - 4 - Question 7

Which of the following statements is incorrect regarding magnetic field lines :

Test: Magnetic Effects of Electric Current - 4 - Question 8

Magnetic field lines determine :

Test: Magnetic Effects of Electric Current - 4 - Question 9

The magnetic field near a long straight wire is described by :

Test: Magnetic Effects of Electric Current - 4 - Question 10

The phenomenon of electromagnetic induction is :

Test: Magnetic Effects of Electric Current - 4 - Question 11

Potential difference between a live wire and the neutral wire is :

Test: Magnetic Effects of Electric Current - 4 - Question 12

A rectangular coil of copper wires is rotated in a magnetic field. The direction of the induced current changes once in each :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 12

Among given options half revolution is the right answer.

The current induced by the magnetic field in the rectangular coil made up of copper wire is being turned in order to rotate in the magnetic field, at every turn, the direction of induced current changes and being a vector quantity, induced current changes every half revolution.
 

Test: Magnetic Effects of Electric Current - 4 - Question 13

Magnetic field inside a long solenoid carrying current is :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 13

The field lines inside the solenoid are in the form of parallel straight lines. For a solenoid, the field has to be uniform as a function of position along the axis, since every point along the length is the same as every other point. This indicates that the magnetic field is uniform inside the solenoid.
Hence magnetic field is the same at all points inside the solenoid. 

Test: Magnetic Effects of Electric Current - 4 - Question 14

At the time of short circuit, the current in the circuit :

Test: Magnetic Effects of Electric Current - 4 - Question 15

The frequency of direct current is :

Test: Magnetic Effects of Electric Current - 4 - Question 16

The frequency of household supply of a.c. in India is :

Test: Magnetic Effects of Electric Current - 4 - Question 17

The most important safety device method used for protecting electrical appliances from short circuiting or overloading is :

Test: Magnetic Effects of Electric Current - 4 - Question 18

Current flowing in conductor A is 2A and current flowing in conductor B is 4A. The ratio of magnetic field produced around conductor A to the magnetic field produced around conductor B at a distance 10 cm from both the conductors is:

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 18

Because both of them have current flowing through them in equal ratio. i1: i2 = mag1: mag2

Test: Magnetic Effects of Electric Current - 4 - Question 19

Current flowing in conductors A and B is same, what is the ratio of the magnetic field produced around the conductor A at a distance of 5 cm from the conductor to the magnetic field produced around the conductor B at a distance of 2 cm from this conductor is

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 19

Magnetic field produced is directly proportional to the current flowing and inversely proportional to the distance from the conductor. Since current flowing in both conductors is same only distance matters here. Since field is inversely proportional to distance ; 
B(A) / B(B)  = d(B) / d ( A) = 0.2/0.5 
=>  0.4 

Test: Magnetic Effects of Electric Current - 4 - Question 20

Same amount of current flows in the same direction .long the two parallel conductors separated by a small distance:

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 20

When a conductor carries current it emits magnetic field around it . By the right-hand rule, a current out of the page in a field up gives a force to the left. Two parallel wires carrying currents in the same direction attract one another; wires with currents going in opposite directions repel.

Test: Magnetic Effects of Electric Current - 4 - Question 21

When an electric current flows through a long solenoid, magnetic field is set up in and around the solenoid :

Test: Magnetic Effects of Electric Current - 4 - Question 22

Magnetic field produced at the centre of a current carrying circular wire is :

Test: Magnetic Effects of Electric Current - 4 - Question 23

In all the electrical appliances, the switches are put in the

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 23

If the switch is placed in the neutral wire, the electrical appliance is still connected to the high voltage live wire even when the switch is opened.)
This may cause the user to get an electric shock if he touches the live wire.
That’s why the switches are put in the live wire.

Test: Magnetic Effects of Electric Current - 4 - Question 24

Which of the following properties of a proton can change while it moves freely in a magnetic field ?

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 24

Each moving charged particle in a magnetic field experiences a force. The direction of force experienced by a positive charge is given by Fleming's left hand rule. The force acting on the proton would change both velocity and momentum. 

Test: Magnetic Effects of Electric Current - 4 - Question 25

A positively charged particle say an alpha particle projected towards west is deflected towards north by a magnetic field. The direction of the magnetic field is :

Detailed Solution for Test: Magnetic Effects of Electric Current - 4 - Question 25

The correct answer is A as Here the direction of current toward west and towards north .So by Fleming left hand rule the direction of magnetic field is upward. the rule used in Fleming left hand rule which states that if we stretch our thumb forefinger and middle figure of our left hand perpendicular to each other in such a way that forefinger points the direction of magnetic field and middle figure points the direction of current and middle figure points the direction of current then thumb will represent the direction of force.

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