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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 5

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Subject :NSO    Class : Class 1

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Class : Class 6

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 5

Which one of the following pairs is correctly matched?

Problem Solution
A Air pollution Avoiding catalytic
converters in
automobiles
B Water pollution Discharging
industrial waste
into nearby water
C Land pollution Recycling paper
and reusing plastic
bottles whenever
possible
D Air pollution Using more diesel /
petrol over CNG


The correct answer is C

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 1

Ans 1:

Class : Class 4
b

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Subject :NSO    Class : Class 6

On a cold winter day, Sohan put a room heater near his aquarium, which made water in the aquarium warm but not hot. What could happen due to this?

AFishes would feel more comfortable in warm water due to more availability of oxygen.
BFishes would suffocate due to less availability of oxygen for breathing.
CFishes would die due to decrease in amount of carbon dioxide dissolved in warm water.
DFishes would feel more comfortable in warm water due to decrease in amount of dissolved carbon dioxide.


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Subject :NSO    Class : Class 6

A few methods of separation are represented with the help of examples as :
W : Alum is added to muddy water to settle the mud particles at the bottom.
X : Salt is separated from saline water without any loss of water.
Y : Sand is separated from gravel at a construction site.
Z : Chilli powder is separated from its mixture with water.
W, X, Y and Z are respectively

ALoading, evaporation, sedimentation and sieving
BFiltration, decantation, sieving and winnowing
CEvaporation, winnowing, sedimentation and sieving
DLoading, distillation, sieving and filtration.


d

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Subject :NSO    Class : Class 6

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