Magnetic Induction and Demagnetization

Magnetic induction is the process by which substances like iron are magnetised by the magnetic field. Demagnetization means decreasing magnetic property or losing it completely. This note provides us with an information about the magnetising of a magnetic substance and demagnetizing magnets.

Summary

Magnetic induction is the process by which substances like iron are magnetised by the magnetic field. Demagnetization means decreasing magnetic property or losing it completely. This note provides us with an information about the magnetising of a magnetic substance and demagnetizing magnets.

Things to Remember

  • Magnetic induction is the process by which substances like iron are magnetised by the magnetic field.
  • Demagnetization means decreasing magnetic property or losing it completely.
  • There are various ways to demagnetize a magnet. for instance, Dropping regularly from the table or height, Rubbing against diamagnetic substances etc.
  • In the magnet, each and every small part of the magnet is directed in the north and the south directions.

MCQs

No MCQs found.

Subjective Questions

Q1:

Rewrite the following sentences in  the form of a question, using the question word in brackets.

Examples: kevin is eating an apple, (what)→What is kevin eating?

  1. School started an hour ago, (When)
  2. I'm going to the temple. (where)
  3. Raju and sunita passed the exam.(who)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>When did school start?</li> <li>Where are you going?</li> <li>Who passed the exam?</li> </ol><p></p> <p></p>

Q2:

Write the following sentences in the simple past tense.

  1. Sunil eats rice.
  2. They watch TV.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>Sunil ate rice.</li> <li>They watched TV.</li> </ol>

Q3:

Fill in the blanks with the best word from the bracket.

  1. Sarah sat________ (at/in/of) the library.
  2. Everyone drank tea _______ (also/and/but) mary.
  3. The book is_______ (at/in/on) the floor.
  4. Most _______ (in/of/for) my sister.
  5. The coat is _______ (in/of/for) my sister.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>in</li> <li>but</li> <li>on</li> <li>of</li> <li>for</li> </ol>

Q4:

Complete the following sentences by choosing the correct word from the pair given in brackets.

  1. Mary was greatly .........ed by her father's death. [affect/effect]
  2. When does the new law come into .............? [affect/effect]
  3. There were a few ......... sheets of paper on the table. [loose/lose]
  4. He expected to........... the election. [loose/lose]
  5. My doctor has a private ......... [practice/practise]

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>affect</li> <li>effect</li> <li>loose</li> <li>lose</li> <li>practice</li> </ol>

Q5:

Put the following words into the correct order to make suitable sentences.

  1. years/she/English/four/was/compulsory/studying/for
  2. official/he/a/to/wanted/government/become
  3. a/she/hospital/hoped/in doctor/become/to/a
  4. of/he/tea/her/him/cup/asked/give/a/to
  5. his/he/to/has/dinner/started/just/eat

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>She was studying compulsory English for four years.</li> <li>He wanted to become a government official.</li> <li>She hoped to become a doctor in a hospital.</li> <li>He asked to give him a cup of tea.</li> <li>He has just started to eat his dinner.</li> </ol>

Q6:

Put the following words into the correct order to make suitable sentences.

  1. wearing/she/a/be/dress/will/white.
  2. English/he/a/to wanted/teacher/be/of.
  3. cricket/they/fond/playing/of/are.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>She will be wearing a white dress.</li> <li>He wanted to be a teacher of English.</li> <li>They are fond of playing cricket.</li> </ol>

Q7:

Rewrite the following sentences, choosing the correct word from the pair given in bracket.

  1. Some new rules and regulations will come into (effect,affect) from the coming year.
  2. Your handwriting should be (legible,eligible).
  3. There were a few (losse/lose) sheet of paper over there.
  4. The student are (taking/giving) theHSEB examination.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>effect</li> <li>legible</li> <li>loose</li> <li>giving</li> </ol>

Q8:

Rewrite these sentences, filing in the gap with appropriate words from the list.

(Words: therefore,became,though,in spite of, however, because of)

  1. He sat in front of the fire ......... he liked its worth.
  2. His stamp albums were full, .......... he needs a new one.
  3. He collected space travel stamps ......... his grandson's  interest.
  4. ......... having collected stamps for so many years, he still enjoyed the hobby.
  5. It was getting more expensive to buy stamps....... he decided to continue collecting them.
  6. He still preferred to collect british stamps ........ they were not as colourful as nepalese stamps.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>because</li> <li>therefore</li> <li>because of</li> <li>in spite of</li> <li>however</li> <li>though</li> </ol>

Q9:

Rewrite  these sentences filing in the gaps with appropriate forms of the verb HAVE.

  1. My brother....... not much money at the moment.
  2. She ........ an accidental last year.
  3. By next month he......... finished the exams.
  4. My friend is lucky, her parents ....... television.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>has</li> <li>had</li> <li>will have</li> <li>have</li> </ol>

Q10:

Rewrite these sentences  filling in the gap with appropriate words from the bracket.

  1. She hasn't finished the work ....... (yet/already)
  2. We must be........ of our country. (pride/proud)
  3. I offered her a cup of tea but she ........ (accepted/refused)
  4. Your ......... helped me to find a job (recommendation/accommodation)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>yet</li> <li>proud</li> <li>refused</li> <li>recommendation</li> </ol>

Q11:

Put the following words in the correct order to make suitable sentences.

  1. the/must/bus/he/have/caught.
  2. angry/she/with/is/ram.
  3. him/made/capital/we.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>He must have caught the bus.</li> <li>She is angry with Ram.</li> <li>We made him captain.</li> </ol>

Q12:

Rewrite these sentences  , filling in the gap with appropriate words from the brackets.

  1. Anuradha runs a ........ shop. (stationery/statinary)
  2. Utah is ....... mid-west USA. (to/in)
  3. I'm sorry, but your handwriting is ....... (eligible/illegible)
  4. His shirt is torn  .......... , he needs a new one. (however/therefore)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>Stationary</li> <li>in</li> <li>eligible</li> <li>therefore</li> </ol>

Q13:

Put the following words in the correct order to make suitable sentences.

  1. does/her/have/what/she/hand/in?
  2. what/do/she/not/have/i/wants
  3. of/he/tea/her/him/cup/asked/give/a/to

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>What does she have in her hand?</li> <li>i don't have what she wants.</li> <li>He asked him to give him a cup of tea.</li> </ol>

Q14:

Write present participle and past participle forms of the following verbs:

  1. sing
  2. run

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>sings,sung</li> <li>runs,run</li> </ol>

Q15:

Add appropriate prefix or suffix in the following words:

  1. usual
  2. satisfied
  3. child
  4. do
  5. happy
  6. loyal

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>un</li> <li>dis</li> <li>ish</li> <li>undo</li> <li>un</li> <li>dis</li> </ol>

Q16:

Put the following words in correct order in order to make sensible sentences:

  1. his/he/to/had/dinner/started/just/eat
  2. of/he/tea/her/him/cup/asked/give/a/to
  3. a/she/hospital/hoped/in/doctor/become/to/a

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>He had just started to eat his dinner.</li> <li>He asked her to give him a cupof tea.</li> <li>She hoped to become a doctor in hospital.</li> </ol>

Q17:

Rewrite  the following sentences choosing the correct word from the pair given in the brackets:

  1. I would strongly .......... you to use the dictionary. (advise/advice)
  2. He arranged to see her ........ in the day (later/latter)
  3. That man cannot read or write:he is ......... (literate/illiterate)
  4. She said she was ......... in playing volleyball. (interested/interesting)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>advise</li> <li>later</li> <li>illiterate</li> <li>interested</li> </ol>

Q18:

Rearrange the following words in correct order so as to make sensible sentences:

  1. do/you/see/Pokhara/in/like/to/what?
  2. he/had/visit/to/ Ashish/ if/money/,/enough/would/ Australia/ go.
  3. where/ is / the / village / I / this / live.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>What do you like to see in Pokhara?</li> <li>If Ashish had enough money, he would go to visit Australia.</li> <li>This is the village where I live.</li> </ol>

Q19:

Rewrite following sentences choosing the correct word from the pair given in brackets:

  1. We are sending her a letter of ......... ( Congratulation/ Congratulation)
  2. The .......... of our school is mostly busy. ( Principal/ principle)
  3. Do you think the new constitution of Nepal will come into ....... (affect/ effect) soon?
  4. She is fond of ....... ( play/ playing) badminton.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>Congratulation</li> <li>Principal</li> <li>effect</li> <li>playing</li> </ol>

Q20:

Make sensible sentences putting the words in correct order

  1. culture / enormous/ an/ role/ shaping / in plays/ the / expectations/ the/ of / people.
  2. Don't / I / quite / know / what / to / I/ ought/ do.
  3. They/ playing/ were/ in / library/ the/  puzzles/  crosswords.
  4. dentist/ often/ how/ do/ you / to/ the / go?
  5. about/ Ursula / wrote/ john/ to/ her/ family.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>Culture plays an enormous role in shaping the expectations of the people.</li> <li>I don't quite know what I ought to do.</li> <li>They were playing crosswords puzzles in the Library.</li> <li>How do often you go to the dentist?</li> <li>Ursula wrote to john about her family.</li> </ol>

Q21:

Rearrange the following words to make sensible sentences:

  1. his/ he/ to/ had/ lunch/ started/ just/ eat.
  2. medicine/ wanted /study / he/ to.
  3. not/ him/ casino/ let/ go/ to/ do.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>He had just started to eat his lunch.</li> <li>He wanted to study medicine.</li> <li>Do not let him to go casino.</li> </ol>

Q22:

Rewrite the following sentences choosing the correct word from the pair given in bracket:

  1. Switzerland has smaller population ........ Britain.[then/ than]
  2. The thief ......... the bank.[robbed/stole]
  3. Tom scored a ....... in the match. [goal/gaol]
  4. Mohan promised to follow his teacher's .............[advise/advice]

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>than</li> <li>stole</li> <li>goal</li> <li>advice</li> </ol>

Q23:

Change the following words as indicated in the bracket:

Beautiful (noun), Courage (Adj.) , Broad (verb)


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>beauty,courageous,broaden</p>

Q24:

Arrange the following words into correct sentences:

  1. animals/it/and/to/at/of/is/birds/look/stamps/interesting
  2. stamps/country/possible/lot/it/its/a/to/is/from/about/a/learn

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>It is interesting to look at the stamps of birds and animals.</li> <li>It is possible to learn a lot about a country from stamps.</li> </ol>

Q25:

Arrange the following words alphabetically:

photo,photograph,photographer,photogenic,photosynthesis,photographed


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>Photo,photogenic,photograph,photographed,photographer,photosynthesis</p>

Q26:

Put the verbs in brackets in the correct forms.

  1. The girl....... (get) married six months ago.
  2. If you drop it, it .......(break).
  3. Everyday sarah ........ (go) to her college by bus .

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>got</li> <li>will break</li> <li>goes</li> </ol>

Q27:

Change the following words as indicated in the bracket:

  1. Write (present participle)
  2. Sing (past participle)
  3. Dig (present participle)
  4. Cut (Past partciple)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>writing</li> <li>sung</li> <li>digging</li> <li>cut</li> </ol>

Q28:

Arrange the following words into correct sentences:

  1. asked/where/from/she/me/was/I.
  2. many/studying / we compulsory English/ years/ for /have been.
  3. you/ exam/expect/your/ I/that/will/ pass.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>she asked me where i was from.</li> <li>We have been studying compulsary English for many years.</li> <li>I expect that you will pass you exam.</li> </ol>

Q29:

Put the verbs in brackets in the correct tense.

  1. The bus ........ (leave) already.
  2. I .......(see) him last friday.
  3. I ....... (not find) the film interesting.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>has left</li> <li>saw</li> <li>didn't find</li> </ol>

Q30:

Choose the correct word from the pair given in brackets to complete the following sentences:

  1. He was ....... in the earthquake last year. (died/killed)
  2. I am sorry , but your handwriting is ........ (eligible/illegible)
  3. Please could you ....... me your book? (borrow/lend)
  4. The thief ........ the bank (robbed/stole)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>killed</li> <li>illegible</li> <li>lend</li> <li>robbed</li> </ol>

Q31:

Rearrange the following words to make sensible sentences:

  1. that/ wrong/ he/ was/ admitted
  2. a/ it/ time/ you/ will/ lot/ of/ save
  3. order/ the/ wrong/ following/ the/ words/ are/ in

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>He admitted that he was wrong.</li> <li>it will save you a lot of time.</li> <li>The following words are in the wrong order.</li> </ol>

Q32:

Rewrite the following sentences choosing the correct words from the pairs given in brackets.

  1. As a student, your handwriting should not be ........ (eligible/illegible)
  2. My mother can read and write. She is ....... (illiterate/literate)
  3. Rama is ........ enough to carry a raincoat during the rainy season. (sensitive?sensible)
  4. His brother was ....... in the earthquake last years. (killed/died)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>illegible</li> <li>literate</li> <li>sensitive</li> <li>killed</li> </ol>

Q33:

Put the verbs in brackets in the correct tense:

Simple present, Simple future or present perfect

  1. Everyday shyam ...... (go) office by bus.
  2. The girl ....... (get) married six months ago.
  3. I ....... (write) a book, but i don't know how to get it published.
  4. The earth ....... (go) round the sun.
  5. If the ballon bursts the child ......... (ask) for another.
  6. When I first ....... (met) him in 1999,he was a small boy.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>goes</li> <li>got</li> <li>have written</li> <li>goes</li> <li>will ask</li> <li>met</li> </ol>

Q34:

Write the antonyms of the following words:

cheerful,fast,regular,lucky


Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <p>cheerless, slow, irregular, unlucky</p>

Q35:

Put the verbs in bracket in the correct tense.

  1. I ........ (buy) this book yesterday.
  2. The earth ...... (go) round the sun.
  3. Everyday Mr.Sharma ...... (go) college on bike.
  4. They ...... (not go) out yet.
  5. The girl ....... (get) married six months ago.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>bought</li> <li>goes</li> <li>goes</li> <li>have not gone</li> <li>got</li> </ol>

Q36:

Rewrite the following sentences choosing the correct word from the pair given in brackets:

  1. The college code of conduct will come into ...... soon. (affect/effect)
  2. My ........ is to help the people who are needy. (principal/principle)
  3. I need a ...... sheet of a paper at the moment. (loose/lose)
  4. Look, students are ....... their examination. (giving/taking)
  5. Her mother gave me a piece of ......... (advice/advise)
  6. He is ........ sleeping. (steel/still)

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>effect</li> <li>principle</li> <li>loose</li> <li>taking</li> <li>advice</li> <li>still</li> </ol>

Q37:

Rearrange the following words in correct order so as to make sensible sentences.

  1. Muna/tonight/dinner/cooking/is.
  2. does not/how/dance/he/know/to.

Type: Short Difficulty: Easy

Show/Hide Answer
Answer: <ol><li>Muna is cooking dinner tonight.</li> <li>he does not know how to dance.</li> </ol>

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Magnetic Induction and Demagnetization

Magnetic Induction and Demagnetization

Magnetic Induction

Magnetic induction is the process by which substances like iron are magnetised by the magnetic field. The magnet causes the individual particles of the iron, which act like tiny magnets, to line up so that the sample as a whole becomes magnetised. Most of this induced magnetism is lost when the cause of magnetism is taken away.

Activity 1

  1. Place an iron nail on the table.
  2. Place small pin near the iron nail.
  3. Now, put a bar magnet above the iron nail and see what happens.

You can see the iron nail gets magnetise and attract the pin towards it.

Demagnetization

Demagnetization means decreasing magnetic property or losing it completely. In the following conditions, magnet loses its property.
  1. Dropping regularly from the table or height.
  2. Rubbing against diamagnetic substances.
  3. Bringing similar poles closer by applying an external force.
  4. Using the magnet for making other magnets.
  5. By heating the magnet.
  6. By passing the magnet in a copper coil of alternating current (AC) and pulling it against the direction of the current.

Ways to prevent magnet from demagnetization:

  1. Do not heat magnet or keep it near the hot object.
  2. Do not drop the magnet.
  3. Do not hit or rub magnet.
  4. Do not let magnet rust.
  5. Do not keep similar poles of magnet closer to each other.

Lesson

Magnetism

Subject

Science

Grade

Grade 8

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