National Science Olympiad Forum By SOF Olympiad Trainer - Page 251
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Hima Devireddy from Phoenix , Hyderabad
Subject :NSO    Class : Class 5

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Sreekala Kotipalli from fks, rjy
Subject :NSO    Class : Class 5

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rachana sapre from Orion ICSE school, Mumbai
Subject :NSO    Class : Class 7

Given are five processes in the treatment of sewage. Arrange the processes in the correct order and select the correct option.
(i) In the digester tank, many anaerobic bacteria decompose the organic matter present in sludge to produce biogas.
(ii) Solids are separated from liquids by using screens.
(iii) The clarified water is passed into aeration tank that contains aerobic bacteria.
(iv) Impurities settle to the bottom of the tank in the form of sludge in sand and grit chambers.
(v) Suspended microbes settle down at the bottom as activated sludge and water is discharged into water bodies.

A (iii) → (iv) → (v) → (i) → (ii)
B (ii) → (iv) → (i) → (iii) → (v)
C (i) → (iv) → (ii) → (v) → (iii)
D (ii) → (iii) → (iv) → (v) → (i)


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Swastik Srivastava from Baldwin Boys High School, Bangalore
Subject :NSO    Class : Class 5

Read the given statements and select the option which correctly fills the blanks.
(i) Natural disaster caused by earthquakes or volcanic eruptions under the sea and oceans is called 1.
(ii) Rainwater harvesting is used to minimize the effects of 2.
(iii) 3 is a tropical storm, characterised by fast spinning winds.

1 2 3
A Tsunami Drought Cyclone
B Cyclone Flood Hurricane
C Landslide Hurricane Typhoon
D Drought Flood Hurricane


Ans 1:

Vaibhav Elisetti from sri chaitanya techno school Nallagandla, Hyderabad
Class : Class 7
ANS IS AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA

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Swastik Srivastava from Baldwin Boys High School, Bangalore
Subject :NSO    Class : Class 5

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Omar Faruq Molla from ITL Public School, Delhi
Subject :NSO    Class : Class 5

Ans 1:

Tanmay kaushal from ICSE, Mumbai
Class : Class 5
Class:easy

Ans 2:

Shreeya Mangla from ASN Senior Secondary School, New Delhi
Class : Class 7
Its b because plastic is a bad conductor of both heat and electricity

Ans 3:

Ishani Gandhi from Lourdes convent school, Surat
Class : Class 6
A is the correct answer as linen is a synthetic material thus not obtained from plants

Ans 4:

Saanvi Prasad from DPS Noida, Noida
Class : Class 5
the answer is B

Ans 5:

Ishani Gandhi from Lourdes convent school, Surat
Class : Class 6

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Shriya Prakash from NPS International, Singapore
Subject :NSO    Class : Class 6

Select the incorrect statements.
I. In railway tracks, space is left between two rails at the joint to allow for the expansion of iron rails during winter.
II. For gases, solubility in water decreases with rise in temperature.
III. When mercury thermometer is used to measure the temperature, a chemical change takes place.
IV. At a particular temperature, the amount of salt or sugar that can be dissolved in 100 mL of water is same.
V. Galvanisation involves a physical change.

A I and II only
B III and V only
C I, III, IV and V only
D I, II, III, IV and V

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archana shaji from nps , Bengaluru
Subject :NSO    Class : Class 6

Refer to the given flow chart and select the correct statement regarding it.


ADeficiency of P could cause marasmus whereas deficiency of Q could cause night blindness.
BR could help in proper functioning of nerves and muscles whereas S could be found in blood that neutralises the effects of bacteria and viruses.
CQ could help in red blood cell production whereas R could help in calcium absorption.
DP could get stored in the body cells as glycogen whereas deficiency of Q could cause pellagra.


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Sargah Surya from bgsnps, Bengaluru
Subject :NSO    Class : Class 7

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Arav Gupta from St Stephens School, Chandigarh
Subject :NSO    Class : Class 6

Ans 1:

Anvi from DPS, Noida
Class : Class 7
i guess D is also correct

Ans 2:

Prakhar Gautam from Learning paths, Mohali
Class : Class 6
d is correct

Ans 3:

Siddhartha from Gyanfort school, Farrukhabad
Class : Class 6
Answer is B

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