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17. Read the following and answer any four questions from 17 (i) to 17 (v) (1×4)
Ruchi fixes a sheet of white cardboard sheet on a drawing board. She places a bar
magnet in the centre of it. She sprinkles iron fillings uniformly around the bar
magnet. Then she taps the board gently and observes that the iron fillings arrange
themselves in particular pattern.
(i) What does the pattern shape look like?
a) Straight lines
b) Squares
c) Closed curves
d) Parallel lines
(ii) Why do iron fillings arrange in a pattern?
a) Due to poles of magnet
b) Due to force exerted by magnet within its magnetic field
c) Due to repulsion between the poles and filings
d) None of the above
(iii) What do the lines along which iron filings align represent?
a) Magnetic field lines
b) Magnetic force
c) Magnetic induction
d) Magnetic susceptibility
(iv) What does the crowding of iron filings at the end of the magnet indicate?
a) Magnetic field is weak at poles and stronger at middle
b) Magnetic field is stronger at poles and weak at middle
c) Magnetic field strength goes on decreasing from north to south pole
d) Magnetic field strength goes on decreasing from south to north pole
(v) How the strength of magnetic field is indicated?
a) Magnetic field strength cannot be indicated by magnetic field lines
b) Far the magnetic field lines more is the magnetic strength
c) Closer the magnetic field lines less are the magnetic field strength
d) Closer the magnetic field lines more is the magnetic strength
Answers
Answer:
i) What does the pattern shape look like?
a) Straight lines
b) Squares
c) Closed curves
d) Parallel lines
(ii) Why do iron fillings arrange in a pattern?
a) Due to poles of magnet
b) Due to force exerted by magnet within its magnetic field
c) Due to repulsion between the poles and filings
d) None of the above
(iii) What do the lines along which iron filings align represent?
a) Magnetic field lines
b) Magnetic force
c) Magnetic induction
d) Magnetic susceptibility
(iv) What does the crowding of iron filings at the end of the magnet indicate?
a) Magnetic field is weak at poles and stronger at middle
b) Magnetic field is stronger at poles and weak at middle
c) Magnetic field strength goes on decreasing from north to south pole
d) Magnetic field strength goes on decreasing from south to north pole
(v) How the strength of magnetic field is indicated?
a) Magnetic field strength cannot be indicated by magnetic field lines
b) Far the magnetic field lines more is the magnetic strength
c) Closer the magnetic field lines less are the magnetic field strength
d) Closer the magnetic field lines more is the magnetic strength