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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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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

Sonali mixed a packet of salt in a small amount of sand and then tried to recover the salt by the usual processes of sedimentation, decantation or filtration followed by evaporation. To her surprise, she could recover only a small part of the salt that she had taken. The possible reasons could be
I. Salt also got evaporated along with water.
II. The quantity of salt was much more than that required to form a saturated solution.
III. The undissolved salt remained mixed with sand.
IV. The quantity of water taken was insufficient to dissolve all the salt.

AII and III only
BI and IV only
CII, III and IV only
DAll of these.


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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 6

Match the column I with column II and select the correct option from the codes given :

Column I Column II
P. Chalk-water (i) A gaseous mixture mixture
Q. Glucose (ii) A solid-gas solution mixture
R. Fizzy drink (iii) A homogeneous solid-liquid mixture
S. Smoke (iv) A heterogeneous solid-liquid mixture
T. Air (v) A gas-liquid mixture


A P - (iii), Q - (iv), R - (v), S - (i), T - (ii)
B P - (v), Q - (iii), R - (iv), S - (ii), T - (i)
C P - (ii), Q - (i), R - (iv), S - (v), T - (iii)
D P - (iv), Q - (iii), R - (v), S - (ii), T - (i)


the correct answer is a

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Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
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