9th Physics Chapter 8 MCQs
9th Physics Chapter 8 MCQs.
Tick the correct answer.
8.1 Which one of the following is not a magnetic material?
(a) Cobalt
(b) Iron
(c) Aluminium
(d) Nickel
Correct option is (c)
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8.2 Magnetic lines of force:
(a) are always directed in a straight line
(b) cross one another
(c) enter into the north pole
(d) enter into the south pole
Correct option is (d)
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8.3 Permanent magnets cannot be made by:
(a) soft iron
(b) steel
(c) neodymium
(d) alnico
Correct option is (a)
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8.4 Permanent magnets are used in:
(a) circuit breaker
(b) loudspeaker
(c) electric crane
(d) magnetic recording
Correct option is (b)
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8.5 A common method used to magnetic a material is:
(a) stroking
(b) hitting
(c) heating
(d) placing inside a solenoid having A.C
Correct option is (a)
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8.6 A magnetic compass is placed around a bar magnet at four points as shown in figure below. Which diagram would indicate the correct directions of the field?
(a)
(b)
(c)
(d)
8.7 A steel rod is magnetised by double touch stroking method. Which one would be the correct polarity of the AB magnet?
(a)
(b)
(c)
(d)
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8.8 The best material to protect a devise from external magnetic field is:
(a) wood
(b) plastic
(c) steel
(d) soft iron
Correct option is (d)
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Some important links are given below
