Class 10 Science Chapter 13 MCQ Online Test for 2020-2021
|Chapter: 13||Magnetic Effects of Electric Current|
|Contents:||MCQ Online Tests with Answers |
Class 10 Science Chapter 13 MCQ with Answers for 2020-2021
Class 10 Science Chapter 13 MCQ Online Test with answers are given here to provide a perfect practice to the all students of grade 10. All the answers are taken from NCERT Books for class 10 science only. There are about 75 questions divided in sets of questions. If a user need more practice, click on the button “Start a New Test” given at the end of last question.
The most important safety method used for protecting home appliances from short circuiting or overloading is
[B]. Use of fuse
[C]. Use of stabilizers
[D]. Use of electric meter
Choose the incorrect statement
[A]. Fleming’s right-hand rule is a simple rule to know the direction of induced current
[B]. The right-hand thumb rule is used to find the direction of magnetic fields due to current carrying conductors
[C]. The difference between the direct and alternating currents is that the direct current always flows in one direction, whereas the alternating current reverses its direction periodically
[D]. In India, the AC changes direction after every 1/50 second
For a current in a long straight solenoid N- and S-poles are created at the two ends. Among the following statements, the incorrect statement is
[A]. The field lines inside the solenoid are in the form of straight lines which indicates that the magnetic field is the same at all points inside the solenoid
[B]. The strong magnetic field produced inside the solenoid can be used to magnetize a piece of magnetic material like soft iron, when placed inside the coil
[C]. The pattern of the magnetic field associated with the solenoid is different from the pattern of the magnetic field around a bar magnet
[D]. The N- and S-poles exchange position when the direction of current through the solenoid is reversed
[A]. The production of electricity from magnetism is called electromagnetic induction.
[B]. The process of electromagnetic induction has led to the construction of a generator for producing electricity at power stations.
[C]. An ammeter is an instrument which can detect the presence of electric current in a circuit.
[D]. None of the above.
Each one of the following changes will increase emf (or voltage) in a simple generator except:
[A]. Increasing the number of turns in the armature coil
[B]. Winding the coil on a soft iron armature
[C]. Increasing the size of the gap in which the armature turns
[D]. Increasing the speed of rotation
Ruchika is writing about the factors affecting the strength of an electromagnet. Choose the incorrect statements:
[A]. If we increase the number of turns in the coil, the strength of electromagnet increases.
[B]. If the current in the coil is increased, the strength of electromagnet increases.
[C]. If we reduce the length of air gap between the poles of an electromagnet, then its strength increases
[D]. The strength of an electromagnet cannot be changed by changing the numbers of turns in its coil.
Recently, in a science class test, you are asked a question where you have to say whether the statements are correct or not?
[A]. The minimum force is exerted on a current carrying conductor only when it is perpendicular to the direction of magnetic field.
[B]. The direction of force on a current carrying conductor placed in a magnetic field can also be reversed by reversing the direction of magnetic field.
[C]. No force acts on a current carrying conductor when it is parallel to the magnetic field.
[D]. None of the above
A 3-pin mains plug is fitted to the cable for a 1 kW electric kettle to be used on a 250 V a.c. supply. Which of the following statements is not correct?
[A]. The fuse should be fitted in the live wire
[B]. A 13 A fuse is the most appropriate value to use
[C]. The neutral wire is coloured black
[D]. The green wire should be connected to the earth pin.
Which of the following statement is or are correct?
[A]. A motor is a device which converts electrical energy to mechanical energy.
[B]. A motor works on the principle that when a rectangular coil is placed in a magnetic field and current is passed through it a force exerted on the coil which rotates it continuously.
[C]. Commutator rings reverse the direction of current flowing through the coil after every half rotation of the coil.
[D]. All the above.
Read the following sentences carefully, and choose the correct one:
[A]. The direction of induced current can also be reversed by reversing the direction of magnetic field.
[B]. A generator uses the movement or rotation of a rectangular coil of wire between the poles of a horseshoe magnet to produce an electric current.
[C]. If a wire (in the form of a coil) is kept fixed, but a magnet is moved inside it, even then a current is produced in the coil of wire.
[D]. All the above.
It was first shown by Oersted that electricity and magnetism were related phenomena.
What is magnetic field?
The region surrounding a magnet, in which the force of the magnet can be detected, is called magnetic field of the magnet.
Why do two magnetic field line not intersect?
No two field-lines are found to cross each other. If they did, it would mean that at the point of intersection, the compass needle would point towards two directions, which is not possible.
State the Fleming’s left-hand rule?
According to this rule, stretch the thumb, forefinger and middle finger of your left hand such that they are mutually perpendicular. If the first finger points in the direction of magnetic field and the second finger in the direction of current, then the thumb will point in the direction of motion or the force acting on the conductor.
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