National Science Olympiad Forum By SOF Olympiad Trainer

ravi agarwal from sainik school , Bijapur

Subject :NSO Class : Class 8

Select the option that correctly fills the blanks in any two of the given statements.
(i) ______ refers to the plants found in a particular area.
(ii) ______ species are those which are going to be extinct in near term future.
(iii) The lion tailed macaque is included in ______ species in red data book.
(iv) A place rich in ______ species is called hotspot.

A(i) Fauna, (ii) Endangered
B(iii) Endangered, (iv) Endemic
C(i) Flora, (iii) Vulnerable
D(ii) Rare, (iv) Endangered

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Ans 1:

Bivin Wilson from Suguna pips, Coimbatore

Class : Class 10

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

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ravi agarwal from sainik school , Bijapur

Subject :NSO Class : Class 8

Which graph shows changes that occur in a river after being polluted by sewage?

A

B

C

D

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is a.

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ravi agarwal from sainik school , Bijapur

Subject :NSO Class : Class 8

Identify I, II and III in the given flow chart and select the correct option.

A

B

C

D

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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ravi agarwal from sainik school , Bijapur

Subject :NSO Class : Class 8

The diagram shows a bubble at the bottom of a pool. Assuming that the temperature of the pool is constant throughout the water, which of the following describes the change of the pressure and the density of air in the bubble as it rises to the surface?

--------Pressure------Density
AIncrease--------Increase
BIncrease--------Decrease
CDecrease-------Increase
DDecrease-------Decrease

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is D.

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ravi agarwal from sainik school , Bijapur

Subject :NSO Class : Class 8

Five blocks, B₁, B₂, B₃, B₄ and B₅ of different masses are connected by four identical strings S₁, S₂, S₃ and S₄ as shown in the figure. They are pulled by a steadily increasing force F. Which of the following strings is most likely to break?

AS₁
BS₂
CS₃
DS₄

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Ans 1:

Triguna from Kendriya Vidyalaya No.1 Salt Lake, Kolkata

Class : Class 8

Ans 2:

yuvraj from Bhakti Vedanta Swami mission school, Mumbai

Class : Class 8

Ans 3:

Ridhi Goyal from DAV Public School, Ludhiana

Class : Class 9

answer is part A

Ans 4:

Chatresh ramasai gudi from Bgsnps , Bangalore

Class : Class 8

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aneeshahadke@gmail.com from Euroschool Airoli, Mumbai

Subject :NSO Class : Class 6

Three threads P, Q and R of equal weights were taken and immersed in water for one minute. They were then taken out and weighed again. The observations are shown in the given table.

Clothes made from which thread will be most effective when worn in winter and why?

(A) P, because it is bad conductor of heat

(B) Q, because it has lot of air spaces in between its fibres

(C) R, because it has no air spaces in between its fibres

(D) None of these.
why would any body want air spaces in their sweaters?i would think that the answer is C.please tell me the reason for which the answer is B

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AASHIA CHANDRA from MANAV RACHNA INTERNATIONAL SCHOOL, GURGAON

Subject :NSO Class : Class 7

Read the statements given by three students.

Which out of the following children made wrong statements?

A Naina and Mahi
B Mahi only
C Kartik only
D Mahi and Kartik.

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Ans 1:

Vedant Pungliya from ,

Class : Class 7

b

Ans 2:

Aditya kumar from Sapphire International School, Noida

Class : Class 8

the answer is "b" actually it depends upon the temperature which is present inside the room. If it is hot then transpiration rate will be faster

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Vikram from AVM, Mumbai

Subject :NSO Class : Class 3

Study the given flow chart carefully and answer the question.
Which group lists the items that can replace R in the flow chart?

     P                  Q                    R
AIce cube              Oxygen         Cold Drink
BOxygen                Hydrogen           Water Vapour
CCoca cola               Milk              Vinegar
DWater Vapour       Oxygen Milk

How can the answer be option B? Gases do not have definite shape or volume. Therefore P cannot be oxygen and Q cannot be Hydrogen. Pls clarify

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Ans 1:

Admin from Revisewise, Noida

Class : Class 3

The group listing items that can replace R is Option B. The marking P Q R above the options is an error which we regret and will correct as soon as possible. Thanks for bringing it to our notice.

Ans 2:

Vikram from AVM, Mumbai

Class : Class 5

Thanks for the reply and for rectifying the error

Ans 3:

Jeronee from Christwood School, PERUMBAKKAM

Class : Class 5

The question is which can replace R. according to the flow chart /r doesn't have definite shape nor volume. So it should be a gas or vapour. the option B has all the items in the form of gas, oxygen, hydrogen and watervapour and is the right answer.

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Ashwin Shridhar from VSA, Bengaluru

Subject :NSO Class : Class 5

Following are the characteristics of a type of soil.

1. It has poorvery large water-holding capacity
2. It tends to be very dense
3. has the smallest particle size of any soil type

Which of the following type of crops is suitable to grow in the soil mentioned above?

AWheat
BGroundnut
C Coconut
DPaddy

The first characteristic has two contradictory points: poor and very large water-holding capacity. You need to remove poor as paddy is the answer.