NIOS Class 10 Science & Technology Chapter 17 Solution – Magnetic Effect Of Electric Current
NIOS Class 10 Science & Technology Solution Chapter 17 Magnetic Effect Of Electric Current. NIOS Class 10 Science & Technology Chapter 17 Question Answers Download PDF. NIOS Class 10 Science Notes.
NIOS Class 10 Science & Technology Chapter 17 Solution
Board | NIOS |
Class | 10th (Secondary) |
Subject | Science and Technology (217) |
Topic | Question Answer, Solution, Notes |
CHAPTER: – 17.
(MAGNETIC EFFECT OF ELECTRIC CURRENT)
INTEXT QUESITONS 17.1
1) Define magnet and list its properties?
Ans: – A magnet is two pole devices in one pole known as north pole and the other pole is kno1as south pole. The direction of the flow always from the north pole to south pole.
2) What happen, with the properties of magnet when it is broken into two pieces?
Ans: – When the magnet is broken into pices then the new one will act as full magnet in which one pole is north and other is south.
3) Name the part of telephone where magnet is used?
Ans: – Speaker of the telephone is used the magnet.
4) Hang the bar magnet with the string, it will always rest in which directions
(i) East-west (ii) West-south
(iii) North-south (iv) North-east.
Ans: – Option (iii).
5) Do magnetic field exist throughout space?
Ans: – There exists a magnetic field throughout the space but this existence depends on your position.
6)The north pole, magnetic needle points towards earth’s
(i) North pole (ii) South pole
(iii) Centre (iv) None of the above.
Ans: – Option (ii).
7) What are magnetic poles?
Ans: – The imaginary lines or magnetic lines of forces is emitted from one point and this point is known as the magnetic poles.
INTEXT QUESITONS 17.2
1) Presence of magnetic field around an electric wire can be proved by which an behavior of iron filings
(i) They form a circular pattern as soon as the electricity is turned on.
(ii) Try filing fly off the card when the current is on
(iii) They do not prove anything, because it is magic trick.
(iv) None of the above.
Ans: – Option (i).
2) Among this which property is not belong to electromagnet?
(i) It is permanent magnet
(ii) Its magnetic strength can not be decreased or increased at as well
(iii) Its polarity can be remove by reversing flow of electric current.
(iv) It produces strong magnetic field.
Ans: – Option(ii).
3) To find out the direction of force in the electric motor which rules is used?
(i) Flemings right hand rule
(ii) Flemings left hand rule
(iii) Right palm rule of right hand
(iv) Left palm rule of left hand.
Ans: – Option (ii).
4) Why does an iron core increase the magnetic field of a coil of wire –
(i) The iron atom line up to add the magnetic field
(ii) Iron attract things includes magnetic fields
(iii) The iron core actually decreases the field, allowing it to be turned off.
Ans: – Option (i).
5) List the factors affecting the strength of an electromagnet?
Ans: – The different factors that affect the strength of an electromagnet is –
- Distance between the Poles.
- Current in coil.
- Number of turns in the coil.
6) What is the role of solenoids in making electromagnet?
Ans: – The purpose of solenoid is to produce the magnetism in this the there are present a solid iron core in this solenoid which produces the magnetic fields.
INTEXT QUESTIONS 17.3
1)The work of an electric generator is to:
(i) Change chemical energy to electrical energy.
(ii) Change mechanical energy to electrical energy.
(iii) Change electrical energy to mechanical.
(iv) Change electrical energy to chemical energy.
Ans: – Option (ii).
2) Appliance that works on the principle of electromagnetic induction.
(i) Electric kettle (ii) Electric bell
(iii) Electric lamp (iv) Electric generator.
Ans: – Option(iv).
3)Electric fuse should have the following combination of melting point and resistance:
(i) high resistance and low melting point
(ii) low resistance and high melting point.
(iii) high resistance and high melting point
(iv) Low resistance and low melting point.
Ans: – Option(i).
4)Which principle states that by changing magnetic field, current produced:
(i) Coulombs law
(ii) Magnetic behaviour of a solenoid
(iii) Electromagnetic induction
(iv) Ohms.
Ans: – Option(iii).
5)Appliance that converts high voltage to low voltage is:
(i) Step up transformer
(ii) Step down transformer
(iii) Rectifier
(iv) Amplifier.
Ans: – Option(ii).
6)Fuse wire is made up of
(i) Silicon and Tin alloy
(ii) Tin coated with zinc
(iii) tin coated with nickel
(iv) Tin coated with aluminium.
Ans: – Option(i).
7)According to Flemmings left hand rule the force acting on the current carrying conductor is:
(i) Parallel to magnetic field and current flow.
(ii) Perpendicular to magnetic field and current flow.
(iii) Parallel to magnetic field but perpendicular to the direction of current flow.
(iv) Perpendicular to magnetic field but parallel to direction of current flow.
Ans: – Option(ii).
8)Which wire saves appliances from damage among those that come into our homes?
(i) Phase (ii) Neutral
(iii) Earth (iv) None of the above.
Ans: – Option(iii).
9)Give the three reasons of accident caused by electricity.
Ans: – The reason of accident caused by electricity is –
- Touched the phase line.
- After touching weigh hand.
10) Name one of the tools used to check the current in wire and commonly used in home and industry.
Ans: – Short circuit is used in checking the current in wire.
11)Sometimes while touching the electrical appliance we have a shocked. What will the commonly answer for this?
Ans: – Shocked is nothing but the flow of current. We know when a wire cut from middle then it requires a path to flow the current which complete because of ours touching the wire.
12)Two coils A and B are placed close to each other. If the current in the coil Ais changed, will some current be induced in the coil B? Give reason.
Ans: – The current in coil B also changes because the effect of electromagnetic induction. As we all know changes of current in the circuit changes the magnetic fields.
TERMINAL EXERCISE
1) Why does a compass needle get deflected when brought near a bar magnet?
Ans: – As the same pole reflect when the same pole came in contact or close to it. In this case the needle of the compass has the same pole as the magnet so it reflects.
2) Explain magnetic field using the concept for magnetic line of forces.
Ans: – There present an imaginary line between the two poles in a magnet. The magnetic lines of forces are presented in a magnetic field. The direction of the magnetic lines always from north pole to south pole and this pines never intersect each other.
3) Write down the properties of magnetic lines of force.
The properties of the magnetic lines of forces-
- The direction of the pole is always north pole to south pole.
- These lines of force never intersect each other.
4) Explain the force acting on current carrying conductor in a magnetic field.
Ans: – The force on a current carrying conductor is dependent on the direction of the current through the coil as when the current is passes from parallel to another conductor then the magnetic lines of forces is created.
5) How is an electromagnet made from a solenoid? Explain. Write down the differences between bar magnet and electromagnet.
Ans: – There needed a strong iron in which we can rounded the solenoid to make it like the electromagnet.
The magnet in the bar magnet is permanent whereas the magnet in the electromagnet is temporary this is the main difference between the two magnets.
6) What is electromagnetic induction. Explain in detail the functioning of any one appliance based on this principle.
Ans: –The electromagnetic induction is the changes in the magnetic field in a circuit produces the voltage in that.
The ac generator works in this principal.
7) Describe the advantages of AC over DC.
Ans: – The ac is alternating current and the dc is direct current. For the transformation of the small current, we use the dc whereas for the transformation of high current we use the alternating current.
8) What is the function of an earth wire? Why is it necessary to earth electrical appliances?
Ans: – The earth wire directs the excess current in the circuit to the ground.
When there is excess current in a circuit then there is probability of the affecting the appliances of the home so we use the earth wire to transmitted the excess current to the ground.
9) Make such a household circuit that shows current coming from a pole to the room and at least a fan and a bulb can be lit. Explain the use of socket, switch and fuse as well.
Ans: –
10) Name some devices in which electric motors are used.
Ans: – The ceiling fan in our household uses the electric motor.
11) How does current reach from electricity production centre to the houses?
Ans: – The current at first produced from a power plant then the high voltage line transfers this current to the local transformer then from that by using the step-down transformer the current is reached to the house.
12) Explain the structure and functions of AC generator.
Ans: –
13) Explain the magnetic effects of electric current and on the basis of this explain the functioning of the electric bell.
Ans: –
14) What is Flemings left hand rule?
Ans: – According to Fleming left hand rule the direction is perpendicular to both the direction of the current and the magnetic field then if the first finger shows the direction of the magnetic field, middle one the direction of current flow, then the thumb shows the direction of force.
15) When does an electric short circuit occur?
Ans: – The high resistance commenting the two sources affected by the excess surge of current and the appliances get damaged.