National Science Olympiad Forum By SOF Olympiad Trainer

Shaurya Manjkhola from St Kabir Public School Chandigarh, Chandigarh

Subject :NSO Class : Class 8

A sonic 'tape measure' is used to measure the length of a room. It measures a time interval of 0.060 s between transmitting a sound pulse and receiving the echo. The speed of sound in air is 330 m/s. How far is the reflecting wall from the 'tape measure'?

A5.5 m
B9.9 m
C11 m
D20 m

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Ans 1:

The Address from Somaiya, Mumbai

Class : Class 6

Ans 2:

Manabendra from MPS, BBSR

Class : Class 8

A

Ans 3:

Kashish Kathuria from Delhi Public School, Bangalore

Class : Class 9

Ya

Ans 4:

The Address from Somaiya, Mumbai

Class : Class 6

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Devdarsh hero from HOLY GRACE, Mala

Subject :NSO Class : Class 6

Refer to the given paragraph. Identify X and select the correct option. X is a long, soft plant fibre that can be spun into coarse and strong threads. It is a rainy season crop, which grows best in alluvial soil.

AJute
BCotton
CSilk
DLilin

what is lilin ? and jute grows best in loamy soil

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Kalpn from Chaitnya, Kolkata

Subject :NSO Class : Class 5

Count the number of triangles in the given figure.

A20
B16
C22
DNone of these

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Ans 1:

Arnav Nandan from ST PETERS COLLEGE AGRA, Agra

Class : Class 9

no it is 17 that means none of these

Ans 2:

Eashta Khodke from Elpro International School Chinchwad Pune, Pune

Class : Class 8

Ans 3:

Iraj Singh from DPS Megacity, Kolkata

Class : Class 9

Ans 4:

Khushi Aggarwal from Venkateshwar Global School, Delhi

Class : Class 5

The answer should be 16

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Lavanya Ramesh from Vidya Soudha Public School , Bangalore

Subject :NSO Class : Class 6

Two positions of a dice are shown below. When number 3 is at the top, which number will be at the bottom?

A 1
B 2
C 5
D 6

Answer is C 5

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Ans 1:

Ahamed Shayaan from Sree Gokulam public school , Calicut

Class : Class 6

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ADITII S KUMAR from HOLY ANGELS' ISC SCHOOL, Trivandrum

Subject :NSO Class : Class 10

The position-time graph of a particle of mass 40 g is shown here. Which of the following statement is true about the graph?

(a) The particle receives an impulse of 8 x 10^–4 kg m s^–1 after every 1 s.
(b) The particle receives an impulse of 8 x 10^–4 kg m s^–1 after every 2 s.
(c) The particle receives an impulse of 4 x 10^–4 kg m s^–1 after every 1 s.
(d) The particle receives an impulse of 4 x 10^–4 kg m s^–1 after every 2 s.

how do we know the impulse?

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Srikar from SSRVM, Bangalore

Subject :NSO Class : Class 8

How many number of primary consumers are represented in the given food web?

AFour
BSix
CTwo
DThree

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

A

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Mohammed Najl from Credence high school Dubai, Dubai

Subject :NSO Class : Class 5

Which example is correct for the appropriate use of a scientific tool?

AA scale can be used to measure the length of pond snails.
BA graduated cylinder can be used to collect pond snails.
CA ruler can be used to measure the mass of pond snails.
DA microscope can be used to measure the weight of a pond snail.

a scale is for measuring the weight of an object.

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Ans 1:

Mohammed Najl from Credence high school Dubai, Dubai

Class : Class 5

isn't a scale used for measuring weight?

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Anagha s Karnis from vijaya vittala vidyashala, MYSORE

Subject :NSO Class : Class 7

Observe the 3-D shapes and relative sizes of the two objects as shown. How will the shadow look like when the ring and object Z are placed between the light source and the screen as illustrated ?

A
B
C
D

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Lakshya from NPS agara, Bengaluru

Subject :NSO Class : Class 4

Study the given Venn diagram and select the correct option.

	P	Q
A	Mushroom	Banyan tree
B	Mango tree	Neem tree
C	Fern	Banyan tree
D	Mango tree	Fern

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Ans 1:

Aditya Rai from Kv No.1 Icchanath, Surat

Class : Class 7

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

C

P reproduces by spores and makes its own food, so P could be fern.Q makes its own food but does not reproduce by spores, so Q could be banyan tree or neem tree.

Ans 3:

Ava from trio, bangalore

Class : Class 2

Ans 4:

Ava from trio, bangalore

Class : Class 2

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Shreyas V Poojary from Sri Sri Ravishankar Vidya Mandir , Bangalore

Subject :NSO Class : Class 6

Which of the following is correct food chain?

APlant ← goat ← human
BPlant → rabbit → fox → lion
CPlant → mice → moths → owl
DPlant → mice → lion → fox

the ans is Aas lions does not eat foxes

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Ans 1:

Shreyas V Poojary from Sri Sri Ravishankar Vidya Mandir , Bangalore

Class : Class 9

Ans 2:

Daksh Kumar from GCIS, Bangalore

Class : Class 7

answer is A

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