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 : Concave mirrors are used in torches and car headlights.
Statement 2 : Concave mirrors converge the light of the bulbs of torches and car headlights to form a beam of light.

ABoth statement 1 and statement 2 are true and statement 2 is the correct explanation of statement 1.
BBoth statement 1 and statement 2 are true but statement 2 is not the correct explanation of statement 1.
CStatement 1 is true but statement 2 is false.
DStatement 1 is false but statement 2 is true.

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Ans 1:

Joshua Sen from Montfort Senior Secondary School, Roorkee

Class : Class 9

concave mirrors converge light

Ans 2:

Sargah Surya from bgsnps, Bengaluru

Class : Class 4

Ans 3:

from dps north kolkata, Kolkata

Class : Class 8

i dont agree

Ans 4:

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

Class : Class 10

C

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Gaurang Garg from Delhi Piblic School, Bulandshahr

Subject :NSO Class : Class 8

Feeling the tremors of an earthquake, a scared resident of thirteenth floor of a multistoreyed building starts climbing down the stairs rapidly. Which hormone initiated this action?

A Oxytocin
B Thyroxine
C Adrenaline
D Progesterone

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Archi from Mothers Global School, Delhi

Subject :NSO Class : Class 8

When air is passed through red hot coke, a gaseous fuel is produced. The name of this gaseous fuel and its composition are respectively

A Natural gas, CO + H₂
B Producer gas, N₂ + CO
C Water gas, H₂ + CO
D None of these.

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Ans 1:

Nishan Asif from INDIAN SCHOOL SOHAR OMAN, SUHAR

Class : Class 9

Ans 2:

PARTH JAIN from DPS INDIRAPURAM, GHAZIABAD

Class : Class 8

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Which of the following is not a structural adaptation?

A Forelimbs of penguin are modified into flippers for swimming.
B Fennec fox has large ears to help it lose excessive body heat which enables it to inhabit hot xeric habitats.
C Palatable viceroy butterfly mimics unpalatable monarch butterfly to elude its predators.
D Cane toad and hedgehog aestivate to escape harsh summers.

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Ans 1:

Sargah Surya from bgsnps, Bengaluru

Class : Class 4

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

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

A a – (ii), b – (iii), c – (iv), d – (i)
B a – (i), b – (iv), c – (iii), d – (ii)
C a – (iii), b – (i), c – (iv), d – (ii)
D a – (iv), b – (ii), c – (i), d – (iii)

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Ishaan Roy from Sri Chaitanya Techno School, Bengaluru

Subject :NSO Class : Class 7

Read the given statements and select the correct option.
Statement 1 : A twisting funnel of wind with its narrow end towards the land is known as a tornado.
Statement 2 : A tornado develops from a bnbthunderstorm and rotates violently.

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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Ans 1:

Ekansh Agrawal from NDPS, Indore

Class : Class 7

ANSWER IS A

Ans 2:

aniket sabat from vishwajyot high school, navi mumbai

Class : Class 9

Ans 3:

Tviesha Dayalani from Bhavans' Rajaji Vidyashram, chennai

Class : Class 8

Ans 4:

YASH SAH from DELHI PUBLIC SCHOOL MIS DOHA, Doha

Class : Class 8

Ans 5:

Hetuk Patel from Podar Pearl School, Doha

Class : Class 8

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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

Anything

Ans 2:

Taksh from St John High School, Mumbai

Class : Class 8

Ans 3:

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

Class : Class 10

C

Ans 4:

Taksh from St John High School, Mumbai

Class : Class 8

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