National Science Olympiad Forum By SOF Olympiad Trainer

Dhruv from NARAYANA E TECHNO SCHOOL MDYL, Chennai

Subject :NSO Class : Class 3

If 'Blue' means 'Black', 'Black' means 'Red' and 'Red' means 'White', then what is the colour of Human Blood?

AWhite
BRed
CBlack
DBlue

humanbody blood is black

Ans 1:

Achyut Rai from THE KHAITAN SCHOOL, NOIDA

Class : Class 6

its A

Ans 2:

Jeevitha Gnanadev from Sri Kumaran children's home , Bengaluru

Class : Class 3

But red means white ?? But red means white ??

Ans 3:

Aryan fugnar from Sahakar Vidya mandir, Sangrampur

Class : Class 3

Ans 4:

Achyut Rai from THE KHAITAN SCHOOL, NOIDA

Class : Class 6

Ans 5: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

(C): The colour of human blood is Red but Red means Black.

Ans 6:

Aditya Shinde from Abhinav School , Pune

Class : Class 3

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ARYAN PANDHI from AHMEDABAD INTERNATIONAL SCHOOL, AHMEDABAD

Subject :NSO Class : Class 5

Which beak belongs to a bird that feeds on seed grains?

AP only
BQ and R
CS only
DR and S

Ans 1:

Archit Raj from Little ANGELS school , Munger

Class : Class 5

C

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

Bird P has a hooked beak, which is suitable for traring and eating flesh of animals.
Bird Q has a pouch under the beak, which is suitable for gulping the whole fish.
Bird R has long pointy beak, which is suitable for drinking nectar of flowers.
Bird S has the short beak, which is suitable for eating seeds and grains.

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ARYAN PANDHI from AHMEDABAD INTERNATIONAL SCHOOL, AHMEDABAD

Subject :NSO Class : Class 5

Refer the given picture.

Three of the animals shown above are likely to be found in the same habitat. Which of the following options show the correct animal- habitat relationship?

          Animals      Habitat
AP, Q, R       Rotting log
BP, Q, S       Rubbish dump
CP, R, S       Leaf litter
DQ, R, S       Water stream

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Ans 1:

Archit Raj from Little ANGELS school , Munger

Class : Class 5

B

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

P - Ant, Q - House fly, R - Honeybee, S - Cockroach
A rubbish dump mostly has ants, flies and cockroaches.

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ARYAN PANDHI from AHMEDABAD INTERNATIONAL SCHOOL, AHMEDABAD

Subject :NSO Class : Class 5

The graph below shows the number of days in each stage of the life cycle of an animal X.

Which of the following statements is/are true regarding its life cycle?

AIt takes 20 days for the animal X to become an adult after it is hatched.
BAdult has a life span of 8 days.
CPupa does not feed, hence it is of the shortest time span.
DAll of the above

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

It takes 16 days for the animal X to become an adult after it is hatched. The shortest time-span is of egg stage, that is of 4 days.

Ans 2:

Advait Anand from Delhi Public School Ghaziabad, Ghaziabad

Class : Class 5

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Sanaya Singh from Hiranandani Foundation, Mumbai

Subject :NSO Class : Class 2

____________ is a food preservation technique in which excess of salt and oil is added in food unlike _________ where excess of sugar is added.

A Pickling, Canning
B Pickling, Jellying
C Drying, Freezing
D Freezing, Pickling

I did not know the answer to the question

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Ans 1:

Aashi Adwita from Delhi Public School , Secunderabad

Class : Class 4

B

Ans 2:

anu from Haralur, Bengaluru

Class : Class 4

b

Ans 3:

anu from Haralur, Bengaluru

Class : Class 4

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Tay Wen Xuan from Inspiros International School, SHAH ALAM

Subject :NSO Class : Class 9

Two flies P and Q revolve around a light in concentric circular paths. The radius of circular path of P is twice of Q. P travels with a uniform linear speed of 4 m/s while Q travels with a uniform linear speed of 3 m/s. When P completes three full rounds, then Q would have completed

A4 rounds
B3 rounds
C2 rounds
D1 round.

My final answer and the solution's is 4.5. So I round it off to 4 right?

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Jasmine Kaur from Venkateshwar International School , New Delhi

Subject :NSO Class : Class 5

Read the given statements and select the correct option.
Statement 1: Naphthalene balls kept in woollen clothes reduce in size after sometime.
Statement 2: Solid naphthalene balls change into gas due to the warmth of woollen clothes.

ABoth statements 1 and 2 are correct and statement 2 is the correct explanation of statement 1.
BBoth statements 1 and 2 are correct but statement 2 is not the correct explanation of statement 1.
CStatement 1 is correct but statement 2 is incorrect.
DBoth statements 1 and 2 are incorrect.

Woolen clothes do not produce warmth, they only prevent loss of heat. Therefore, statement 2 is incorrect. Hence, the correct answer should be C.

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Ans 1:

Hitanshi Behera from Loyola School , Bhubaneswar

Class : Class 4

Warm clothes do not generate heat but also do not allow cool air to enter hence creating warmth for the naptholine balls

Ans 2:

Saksham Chanani from Sri Sri Academy, Kolkata

Class : Class 9

nahi

Ans 3:

Anant Saxena from Delhi public school Gandhinagar , Gandhinagar

Class : Class 9

WOOLLEN CLOTHES DONT HAVE WARMTH THEY CANT CHANGE TEMPRATURE BY THEMSELVES THE CORRECT ANSWER SHOULD BE C

Ans 4:

Aarna Panjiar from The Shri Ram School, New Delhi

Class : Class 6

Anant is right. Warm clothes do not generate heat.

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Anika S Kumar from Alphabets International school , Chennai

Subject :NSO Class : Class 4

Refer to the given set-up. Beakers X and Y contain equal amounts of water at different temperatures. The water in both the beakers was then poured into the trough. Which of the following is most likely to be the temperature of water in trough after an hour?

A80°C
B90°C
C130°C
D< 80°C

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

When the water of beakers X and Y will be mixed, the final temperature will be somewhere between 50°C-80°C. So the temperature will be < 80°C after an hour.

Ans 2:

Muhammad Ibrahim Siddiqui from The Millennium School - Dubai, DUBAI

Class : Class 6

Ans 3:

Muhammad Ibrahim Siddiqui from The Millennium School - Dubai, DUBAI

Class : Class 6

babuski

Ans 4:

Twisha Arora from Modern Vidya Niketan, Sector - 17, Faridabad, Haryana, FARIDABAD

Class : Class 7

(Master Answer)The correct answer is D.

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Tay Wen Xuan from Inspiros International School, SHAH ALAM

Subject :NSO Class : Class 9

Refer to the given dichotomous key and answer the following questions.

Select the correct match of tissue and its location.

AP-Wall of Bowman's capsule S-Epidermal covering of legume seeds
BQ-Blubber of whale R-Covering of nuts
CR-Petiole of lotus U-Hump of camel
DQ-In subcutaneous tissue T-Stele or vascular cylinder of monocot root