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Portion:
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Ch. 6: Changes Around Us
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Ch. 9: Living Organisms and Their surroundings
[B] Habitat and Adaptation
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Ch. 12: Electricity and Circuits
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Ch. 13: Magnetism
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Ch. 14: Air around Us
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Section A
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1.
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Which of the
following statement is INCORRECT about physical changes?
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1
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(a)
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A new
substance is formed.
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(b)
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Change in
the state of matter of a substance.
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(c)
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Change in the
size of a substance.
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(d)
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No change in
the chemical properties of a substance.
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ans:
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(a) A new substance is
formed.
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Ch 6: Changes
Around Us, Pg- 64
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2.
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Which of the
following statement/s is/are TRUE?
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1
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Statement I:
The atmosphere is thicker at sea level and becomes thinner as we climb
higher.
Statement
II: In coastal areas, the air has a lesser percentage of moisture in it.
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(a)
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Statement I
is true.
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(b)
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Statement II
is true.
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(c)
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Both
statement I and statement II are true.
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(d)
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Neither
statement I nor statement II are true.
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ans:
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(a)
Statement I is true.
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Ch 14:
Air Around Us, Pg-191
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3.
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A shepherd named Magnes living in Greece used to take his herd of sheep
and goats on a mountain for grazing. He always carried a stick to control his
herd. The stick had a small piece of iron attached to one end. One day, he
had to pull hard to free his stick from a rock on the mountain side. The rock was a natural magnet and the stick
got attracted to it. One of the important properties of a magnet is that a
freely suspended magnet always rests in the same direction.
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One end of the magnetic needle in a magnetic compass is coloured red.
This end of the needle always points:
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(a)
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towards south
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(b)
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towards north
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(c)
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towards east
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(d)
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towards west
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ans:
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(b)
towards north
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4.
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A shepherd named Magnes living in Greece used to take his herd of sheep
and goats on a mountain for grazing. He always carried a stick to control his
herd. The stick had a small piece of iron attached to one end. One day, he
had to pull hard to free his stick from a rock on the mountain side. The rock was a natural magnet and the stick
got attracted to it. One of the important properties of a magnet is that a
freely suspended magnet always rests in the same direction.
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What is a natural magnet known as?
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(a)
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Toroid
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(b)
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Lodestone
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(c)
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Haematite
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(d)
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Solenoid
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ans:
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(b)
Lodestone
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5.
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A shepherd named Magnes living in Greece used to take his herd of sheep
and goats on a mountain for grazing. He always carried a stick to control his
herd. The stick had a small piece of iron attached to one end. One day, he
had to pull hard to free his stick from a rock on the mountain side. The rock was a natural magnet and the stick
got attracted to it. One of the important properties of a magnet is that a
freely suspended magnet always rests in the same direction.
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A freely suspended magnet always rests in the :
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(a)
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east-west direction
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(b)
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north-south direction
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(c)
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west-north direction
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(d)
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north-east direction
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ans:
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(b)
north-south direction
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Ch 13:
Magnetism, Pg-182, 178 and 181
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Section B
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6.
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(a)
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For question number (i) and (ii), two statements are given – one
labelled Assertion (A) and the other labelled Reason (R). Select the correct
answer to these questions from the codes (a), (b), (c) and (d) as given
below:
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(I)
Both A and R are true and Ris
correct explanation of the assertion A.
(II)
Both Aand Rare true, but Ris not the
correct explanation of the assertion A.
(III)
A is true but R is false.
(IV)
Ais false but Ris true.
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(i)
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Assertion: Connecting wire is used to
connect all components of an electric circuit.
Reason:Connecting
wire is made of an electric conductor.
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ans:
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(I).
Both A and R are true and Ris correct explanation of the assertion A.
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Ch 12:
Electricity and Circuits, Pg-170
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(ii)
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Assertion: Thick layer of fat is one of
adaptations of yaks.
Reason: A thick layer of fat beneath their skin helps in insulation against
cold.
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ans:
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(I).
Both A and R are true and Ris correct explanation of the assertion A.
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Ch 9:
Living Organisms And Their Surroundings- B, Pg- 130
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(b)
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(i)
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Name the process in which an iron rod turns reddish-brown
when it is exposed to moist air for some time.
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ans:
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Rusting
of iron/Rusting
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Ch
6: Changes Around Us, Pg- 65
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(ii)
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Name the filament used in a bulb to give out
light.
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1
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ans:
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Tungsten
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Ch
12: Electricity and Circuits, Pg-165
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(iii)
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Where is the maximum strength of a magnet located?
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ans:
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The maximum strength of a magnet is locatedat its ends.
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Ch
9: Living Organisms And Their Surroundings- B, Pg- 129
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7.
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Draw a neat labelled diagram to show a closed electric circuit.
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2
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ans:
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Allot 1 mark to draw the components in proper order and
1 mark to show the arrows.
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Ch 12:
Electricity and Circuits, Pg-169
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8.
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State any three characteristics of a desert plant.
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3
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ans:
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The
leaves in these plants are modified into long slender spines to prevent loss
of water.
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Leaves
are covered with dense hair for protection.
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The
stem is also covered with a thick waxy layer which helps to retain water.
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Desert
plants have an extensive root system
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They
have drought-resistant seeds to overcome dry periods
(accept any three)
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Ch
9: Living Organisms And Their Surroundings- B, Pg- 128
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9.
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Answer the following questions:
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5
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(a)
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Define atmosphere.
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ans:
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The
envelope of air surrounding the earth is called atmosphere.
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(b)
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How do plants and animals
help each other in the exchange of gases in the atmosphere?
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ans:
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Plants
take in carbon dioxide to prepare food and release oxygen during
daytime.
1 mark
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This
oxygen is taken in by animals and carbon dioxide is released.
1 mark
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Thus,
plants and animals help each other in the exchange of gases in the
atmosphere.
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(c)
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Which gas is most abundant
in the atmosphere and important for growth of plants and animals?
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ans:
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Nitrogen
gas is most abundant and important for growth of plants and animals.
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(d)
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Name the gas used for
extinguishing fires.
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ans:
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Carbon
dioxide
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Ch
14: Air Around Us, Pg-191, 194 and 192
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