National Science Olympiad Forum By SOF Olympiad Trainer

Supreet Birdi from Global Indian International School, Bangalore

Subject :NSO Class : Class 4

Consider the following statements regarding carbon dioxide.

I .It is produced when an object is burnt.

II .It is consumed by living organisms during respiration.

III . It is released by green plants during photosynthesis.

Among the given statements,

Aonly I is incorrect
Bonly III is incorrect
Cboth I and II are incorrect
Dboth II and III are incorrect

Please explain

Ans 1:

OISHIK KUNDU from Delhi Public school North kolkata, baranagar

Class : Class 4

The ans will also be option B

Ans 2:

Aarush Bansal from PSBN, Bangalore

Class : Class 4

it is wrong answer

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Soham Gupta from JSSIS Dubai, Dubai

Subject :NSO Class : Class 3

Count the number of rectangles in the given figure.

(A) 8

(B) 9

(C) 10

(D) 11

Ans 1:

Ravi Kumar Tammineni from ,

Class : Class 3

Yeah what you told is correct

Ans 2:

Madhu Pujar from ,

Class : Class 3

8

Ans 3:

Admin from Revisewise, Noida

Class : Class 3

Answer: A

8

Solution: There are 8 rectangles in the given figure.

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purnendu from National public school , indiranagar , Bengaluru

Subject :NSO Class : Class 3

Which of the following statements are correct?

(i) Safety means being careful and avoiding accidents only when walking on the road.

(ii) There are rules and signs for safety of people on the ship.

(iii) We must use footpath for walking and cyclists must keep to the left.

(iv) We must cross the road as we like anywhere and everywhere.

A (i), (ii), & (iii)
B (ii) & (iii)
C (iii) & (iv)
D (i) & (iii)

Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

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Soham Gupta from JSSIS Dubai, Dubai

Subject :NSO Class : Class 3

Which part of the given figure needs to be shaded so that 5/8 of the figure is shaded ?

(A) P

(B) Q

(C) R

(D) S

Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

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Yashi Agrawal from Blue Ridge Public School , Pune

Subject :NSO Class : Class 8

Which one of the following would best reduce Climate Change?

AUsage of more organic food
BUsage of unleaded petrol instead of diesel in car engines
CUsage of wind energy in generating electricity
DDriving cars faster so that there is less time spent on journeys

What about pollution due to gases released by combustion of diesel in cars?

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Ans 1:

Khushi from Pathseekers, Beas

Class : Class 3

this is incorrect

Ans 2:

Kshitij verma from DPS KAMPTEE NAGPUR, Nagpur

Class : Class 8

yeah it is incorrect

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Yashi Agrawal from Blue Ridge Public School , Pune

Subject :NSO Class : Class 8

When two mirrors are inclined at an angle of 60°, the number of images formed is

A3
B4
C5
D 6

How?

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Ans 1:

Chandreyee from BGKV, Kolkata

Class : Class 10

No. of images formed = 360/angle between two mirrors [if the quotient is even then it would be (360/angle between two mirrors) -1 ] so, in this case, angle = 60 degrees so no. of images= 360/60=6 and as 6 is even the answer is 6-1=5 CORRECT ANSWER: (C)5

Ans 2:

Rudranil GhoshRoy from ,

Class : Class 8

THE ANSWER'"S C)5 THE FORMULA TO BE USED IS (360/x - 1);x BEING THE ANGLE BETWEEN THE MIRRORS

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Yashi Agrawal from Blue Ridge Public School , Pune

Subject :NSO Class : Class 8

Which of the following representation of the comet around the sun is correct?

A
B
C
D

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Ans 1:

prabhkhelSingh from Hra international school, Gurdaspur

Class : Class 6

correct answer is C 1)Tail of the comet always faces away from the sun. 2)As the comet moves away from the sun,the solar heating diminishes.As a result,coma and nucleus of the comet disappear.When it is at the position farthest from the sun,nucleus warms and begins to sublimate and its size becomes smaller than its previous size.

Ans 2:

Mohak Khetan from Podar International School Powai , Mumbai

Class : Class 8

in C the comets are smaller when they are away from the sun

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Bhagya from Cchs, Jaipur

Subject :NSO Class : Class 6

Refer to the given figure and select the correct option regarding it.

A This technique improves the quality of ground water by diluting the dissolved salts and other substances found in the ground water.
B The technique helps to store water which can directly be used for gardens or for some cleaning purposes.
C The technique is best functional in summer months only.
D Both A and B

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Bhagya from Cchs, Jaipur

Subject :NSO Class : Class 6

Select the option that correctly fills up the blanks in any two of the following statements.
P. In plants with a tap root, the leaves have ____(i)____ venation and in plants with fibrous roots, the leaves have ___(ii)____ venation.
Q. Plants have small openings called____(i)____on the lower surface of the leaves, which help in ___(ii)____
R. The parts of embryo, in seed, called____(i)____ grows into the root and ___(ii)____ grows into the shoot.

A P (i) Parallel, (ii) Reticulate; Q (i) Stomata, (ii) Gaseous exchange
B Q (i) Stomata, (ii) Water absorption; R (i) Root, (ii) Shoot
C P (i) Reticulate, (ii) Parallel; Q (i) Stomata, (ii) Gaseous exchange
D P (i) Parallel, (ii) Reticulate; R (i) Shoot, (ii) Root

View All Answers (2)

Ans 1:

Rishabh Das from sai international school, Bhubaneswar

Class : Class 7

option c is the answer

Ans 2:

Rishabh Das from sai international school, Bhubaneswar

Class : Class 7

option c is the answer

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Bhagya from Cchs, Jaipur

Subject :NSO Class : Class 6

Read the given statements and select the correct option.
Statement 1 : Clothes made from natural fibres are stronger than the clothes made from synthetic fibres.
Statement 2 : Nylon, rayon and silk are common synthetic fibres.

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

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