National Science Olympiad Forum By SOF Olympiad Trainer

Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Read the given statements and select the correct option.
Statement 1 : If light from a laser torch is made to fall on a prism, then a band of seven colours are not observed.
Statement 2 : Laser torch gives out light of only one colour.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Statement 1 is false but statement 2 is true.

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Taksh from St John High School, Mumbai

Subject :NSO Class : Class 7

Refer to the given figure in which some organs are labelled as P, Q, R and S. Which of the following could be true for the labelled parts in a patient who is diagnosed with an unusual sickness wherein he is unable to digest any fat present in his food?

AThe cells of the wall lining of Q are not able to secrete HCl which activates fat digesting enzymes.
BDuct of P is blocked due to which bile cannot enter small intestine.
CR is unable to manufacture bile.
DMicrovilli are absent in S.

Anything

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UMANG from SPRING DALE COLLAGE, Lucknow

Subject :NSO Class : Class 4

Rohit tried to push a wall but failed to do so. What can you conclude from this?

A Energy is not spent and work is not done.
B Energy is spent but work is not done.
C Energy is not spent but work is done.
D Energy is spent and work is done.

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Ans 1:

Apoorva Gaurav from DAV, Muzaffarpur

Class : Class 5

Option b is correct

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Taksh from St John High School, Mumbai

Subject :NSO Class : Class 7

The rain becomes acidic because W, sulphur dioxide and X dissolve in rain drops to form Y, Z and nitric acid respectively. W turns lime water milky. Identify W, X, Y and Z respectively.

A Carbon monoxide, Nitrogen, Calcium hydroxide, Sulphur
B Carbon monoxide, Nitrogen oxide, Carbon dioxide, Sulphuric acid
C Carbon dioxide, Nitrogen dioxide, Carbonic acid, Sulphuric acid
D Carbon dioxide, Nitrogen oxide, Calcium hydroxide, Sulphur.

Anything

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Ans 1:

Taksh from St John High School, Mumbai

Class : Class 8

Ans 2:

Taksh from St John High School, Mumbai

Class : Class 8

Anything

Ans 3:

Taksh from St John High School, Mumbai

Class : Class 8

Ans 4:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM

Class : Class 10

C

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Taksh from St John High School, Mumbai

Subject :NSO Class : Class 7

Kriti performed the following two experiments.
I. She held a hack-saw blade with a pair of tongs and then kept the tip of the free end on the flame. She observed that the blade became red hot.
II. She dropped a shaving blade into the blue coloured copper sulphate solution. The colour of the solution changed to green.
Identify the types of changes occurring in both the experiments.

A I - Physical change, II - Chemical change
B I - Chemical change, II - Physical change
C Both I and II - Physical changes
D Both I and II - Chemical changes

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S KESHAV KUMAR from ST MARYS ICSE SCHOOL, NAVIMUMBAI

Subject :NSO Class : Class 5

Most of Earth's weather events take place in the

A Thermosphere
B Stratosphere
C Mesosphere
D Troposphere.

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Ans 1:

Avani from NPS International singapore, singapore

Class : Class 6

Troposphere is the correct answer

Ans 2:

bh from Asdfgh, Hyderabad

Class : Class 9

D

Ans 3:

Bitan Chakraborty from Adamas international school, Kolkata

Class : Class 10

troposphere

Ans 4:

Avani from NPS International singapore, singapore

Class : Class 6

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SWAPAN KUMAR GHOSH from navy children school, karwar

Subject :NSO Class : Class 6

Refer to the given Venn diagram and select the correct option regarding P, Q, R and S.

	P	Q	R	S
A	Bryophyllum	Mimosa	Sunflower	Morning glory
B	Ivy	Mustard	Marigold	Wheat
C	Canna	Smilax	Calophyllum	Ficus
D	Flax	Maize	Sorghum	Tomato

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Ans 1:

Harshvi Udani from Sawatridevi Agrawal school, Mumbai

Class : Class 6

Ans 2:

Pranav Kartik from DPS sushant lok , Gurgaon

Class : Class 3

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SWAPAN KUMAR GHOSH from navy children school, karwar

Subject :NSO Class : Class 6

Refer to the given Venn diagram and identify animals P, Q and R.

	P	Q	R
A	Viper	Cassowary	Centipede
B	Orangutan	Krait	Prawn
C	Anaconda	Ladybird	Earthworm
D	Hamster	Locust	Black mamba

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SWAPAN KUMAR GHOSH from navy children school, karwar

Subject :NSO Class : Class 6

Read the given statements and select the correct option.
Statement 1 : Our tongue feels cold when we place some glucose on it.
Statement 2 : Dissolution of glucose is an exothermic process.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Both statements 1 and 2 are false.