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Free download in PDF CBSE Class 6 Science Objective Type Questions & Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 6 Students.
21
Mango plant is a _________
A
Herb
B
Shrub
C
Tree
D
none of these
View Answer
22
Tomato plant is a _________
A
Herb
B
Shrub
C
Tree
D
none of these
View Answer
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23
Woody perennial, single main stem called trunk, which gives out number of branches. These plants are _________.
A
Herbs
B
Shrubs
C
Trees
D
none of these
View Answer
24
Woody perennials, attain height between 3m to 5m, bushy appearance, profoused branched stems from the ground. These plants are ______.
A
Herbs
B
Shrubs
C
Trees
D
none of these
View Answer
25
Small plants, soft peroshable stems, attain height upto five feet, generally annuals and biennials. These plants are ________.
A
Herbs
B
Shrubs
C
Trees
D
none of these
View Answer
26
Salt is separated from seawater by
A
evaporation
B
condensation
C
decantation
D
filtration
View Answer
27
Spoilage of food is ___________
A
reversible change
B
fast change
C
undesirable change
D
periodic change
View Answer
Answer: undesirable change
28
Which of the following change is non-periodic?
A
heartbeat
B
earthquake
C
an occurrence of day and night
D
oscillation of pendulum
View Answer
29
Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel because on heating the iron rim
A
expands and fits onto the wooden wheel
B
contracts and fits onto the wooden wheel
C
no change in the size takes place
D
expands first, then on cooling contracts and fits onto the wooden wheel
View Answer
Answer: expands first, then on cooling contracts and fits onto the wooden wheel
30
Rolling of chapatti and baking of chapatti are the changes that
A
can be reversed
B
cannot be reversed
C
can be reversed and cannot be reversed, respectively
D
cannot be reversed and can be reversed, respectively
View Answer
Answer: can be reversed and cannot be reversed, respectively
31
Salt can be separated from its solution (salt dissolved in water) because
A
mixing of salt in water is a change that can be reversed by heating and melting of salt
B
mixing of salt in water is a change that cannot be reversed
C
mixing of salt in water is a permanent change
D
mixing of salt in water is a change that can be reversed by evaporation
View Answer
Answer: mixing of salt in water is a change that can be reversed by evaporation
32
An iron ring is heated. Which of the following statement about it is incorrect?
A
The ring expands
B
The ring almost comes to the same size on cooling
C
The change, in this case, is reversed
D
The ring changes its shape and the change cannot be reversed
View Answer
Answer: The ring changes its shape and the change cannot be reversed
33
Which of the following changes cannot be reversed?
A
Hardening of cement
B
Freezing of ice cream
C
Opening a door
D
Melting of chocolate
View Answer
Answer: Hardening of cement
34
Pick the change that can be reversed from the following.
A
Cutting of trees
B
Melting of ghee
C
Burning of candle
D
Blooming of flower
View Answer
35
Which of the following can be considered as fast change?
A
Growth of child
B
Germination of seed
C
Bursting of crackers
D
Cooking of food
View Answer
Answer: Bursting of crackers
36
Iron rim is made slightly smaller than the wooden wheel. The rim is usually heated before fixing into the wooden wheel, because on heating the iron rim
A
expands and fits onto the wooden wheel.
B
contracts and fits onto the wooden wheel.
C
no change in the size takes place.
D
expands first, then on cooling contracts and fits onto the wooden wheel.
View Answer
Answer: expands first, then on cooling contracts and fits onto the wooden wheel.
37
In general, on heating metals _______
A
contract
B
expand
C
can expand or contract
D
none of these
View Answer
38
Iodine sublimes on heating i.e. directly changes into a gas state without going through liquid state. Which of the following change is not true for iodine sublimation?
A
change is fast
B
change is physical
C
change is chemical
D
change is reversible
View Answer
Answer: change is chemical
39
Changes in which heat is liberated are called _________
A
exothermic changes
B
endothermic changes
C
rapid changes
D
none of these
View Answer
Answer: exothermic changes
40
Which of the following is an example of periodic change?
A
Eruption of volcano
B
Heartbeat
C
A car accident
D
Landslide
View Answer
