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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7

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Subject :NSO    Class : Class 6

Subhi, a class 6 student grouped together a few changes occurring around us as:
Group 1 : Blooming of flowers, breaking of glass, vaporisation of water, sawing of wood
Group 2 : Tides in the ocean, motion of a swing, landslides, occurrence of day and night
Group 3 : Rusting, germination of seeds, burning of fire crackers, growth of a child
Group 4 : Making a paper boat, blowing air into balloon, baking a roti, heating an iron rod
Select the odd one in each group and mention the property which makes it odd.

  Group 1 Group 2 Group 3 Group 4
A Blooming
of flowers
(Physical
change)
Tides in
the ocean
(Periodic
change)
Rusting
(Chemical
change)
Making a
paper boat
(Physical
change)
B Breaking
of glass
(Irreversible
change)
Occurrence
of day
and night
(Natural
change)
Germination
of seeds
(Irreversible
change)
Blowing
air into
balloon
(Reversible
change)
C Sawing
of wood
(Physical
change)
Motion of
a swing
(Periodic
change)
Growth
of a child
(Irreversible
change)
Heating an
iron rod
(Chemical
change)
D Vaporisation
of water
(Reversible
change)
Landslides
(Nonperiodic
change)
Burning of
fire crackers
(Fast
change)
Baking
a roti
(Chemical
change)


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Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
None of these

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 3

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 6

Properties of three substances X, Y and Z are given below :
X : Heavy and non-magnetic
Y : Light and non-magnetic
Z : Magnetic
If X, Y and Z are of same size and colour then, which of the following can be used to separate these particles from their mixture?

A Handpicking followed by filtration
B Winnowing followed by magnetic separation
C Magnetic separation followed by sieving
D Sublimation followed by distillation


Ans 1:

Class : Class 5

Ans 2:

Class : Class 5

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 7

Option which correctly identifies true (T) and false (F) ones.
(i) The seasonal movement of the complete population of animals from one area to another is termed migration.
(ii) Heavy and solid bones help penguins to swim through water at a speed up to 15 miles per hour.
(iii) Toucans have four clawed toes in each leg, two in front and two at the back.
(iv) Most rainforests lie between the Tropic of Cancer and the Tropic of Capricorn, that is why they are often called as tropical rainforests.

  (i) (ii) (iii) (iv)
A F T T T
B T T F T
C T F T T
D F F F T


Ans 1:

Class : Class 7
i guess c

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 8
i think it should be 4

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