National Science Olympiad Forum By SOF Olympiad Trainer

PARTH MEHTA from Navrachana school, Vadodara

Subject :NSO Class : Class 4

Four of Mrs. Singh's pupils made statements related to environment.

Which pupil made an INCORRECT statement?

AShuchi and Prerna only
BPrerna only
CAnu and Shweta only
DShweta only

Ans 1:

Aaryav Misra from Vibgyor High, Bengaluru

Class : Class 4

Sorry, meant why not A

Ans 2:

Overtaker from Blore, Blore

Class : Class 4

B

Ans 3:

AARNAV SINGH from Prudence school Ashok vihar Delhi, Delhi

Class : Class 3

WHY OPTION A NOT?

Ans 4: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

Biodegradable household wastes increase soil fertility.

Ans 5:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi

Class : Class 7

B

Ans 6:

Aaryav Misra from Vibgyor High, Bengaluru

Class : Class 4

Why not C?

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PARTH MEHTA from Navrachana school, Vadodara

Subject :NSO Class : Class 4

Study the given table. Which of the following can be inferred regarding the two surfaces?

ASurface X acts like a mirror.
BSurface Y may act like a mirror.
CSurface X reflects light better than surface Y.
DNone of these

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Ans 1:

AAGNEY GOYAL from VENKATESHWAR INTERNATIONAL SCHOOL, Delhi

Class : Class 4

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

Surface Y is shiny, so it may act like a mirror.

Ans 3:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi

Class : Class 7

B

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Raavi from DPS, Ranchi

Subject :NSO Class : Class 7

During the formation of rain, when water vapour changes back to liquid in the form of rain drops

A Heat is absorbed
B Heat is released
C Heat is first absorbed and then released
D There is no exchange of heat.

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Ans 1:

ASHISH K DIXIT from JASPAL KAUR PUBLIC SCHOOL, NEW DELHI

Class : Class 7

c

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Syed Mohammad Hussain from ISAM, Muscat

Subject :NSO Class : Class 5

Study the three similar glasses of tea that are placed on the table.

Which of the following statements are true about the glasses of tea X, Y and Z?

AThe tea in glasses X, Y and Z have the same amount of heat.
BThe tea in glasses X and Y have more heat than in glass Z.
CThe tea in glass X has more heat than glass Z.
DThe tea in glass Y has more heat than glasses X and Z.

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Ans 1:

Shaurya Gote from KV BSF Dantiwada, S K Nagar

Class : Class 5

Ans 2:

Shaurya Gote from KV BSF Dantiwada, S K Nagar

Class : Class 5

Ans 3:

Shaurya Gote from KV BSF Dantiwada, S K Nagar

Class : Class 5

Ans 4:

Shaurya Gote from KV BSF Dantiwada, S K Nagar

Class : Class 5

5I Think that there is right answer given and the right explaination given. As I am a student , ( Kendriya Vidyalaya ) a very very very very great mistake is there in the question image. It is written 75 degree but there should be just tea written there. If you say that the image is right, no problem but the answer should be AAAAA.Do you like the solution? this is written with the supervision and direction of my science teacher.

Ans 5:

pranesh from kendriya vidyalaya, New Delhi

Class : Class 5

Ans 6:

prithika from Indian school sohar, sohar

Class : Class 5

the answer is A because all the three glasses that is A,B,C is at 75 degrees threfore option A is the right answer

Ans 7:

Saransh Singhania from Vidya Mandir estancia, Chennai

Class : Class 8

Ans 8:

Ahaan Dodiya from Anand Niketan International Sarkhej , Ahmedabad

Class : Class 5

The answer of this question should be A as the temperature is specified and same in all the glasses.

Ans 9:

Saransh Singhania from Vidya Mandir estancia, Chennai

Class : Class 8

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Advika Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Subject :NSO Class : Class 4

12. What is found in Rivers, Lakes, Seas and Ponds? (a). Salt (b). Water (c). Dolphins (d). All of these Your Answer D Correct Answer B How? In all water bodies some salt is there right? SCIENCE CLUB QUIZ QUESTION

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Saarth Agrawal from Podar International School , Mumbai

Subject :NSO Class : Class 4

Why are the days on different planets of different time period?

AThe planets revolve around the Sun in different orbits.
BThe planets rotate on their axis at different speeds.
CThe planets revolve around the Sun at different speeds.
DThe planets are at different distances from the Sun.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

B

Length of the day depends on the speed of rotation of a planet on its axis. The more is the speed the shorter is the length of the day.

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Naavya Kapoor from St Gregorios High school , Mumbai

Subject :NSO Class : Class 4

A factory was set up in an area which used to discharge its untreated waste down the pipe into nearby water body. After few years the factory was shut down due to some legal action. The given graph shows the changes in the populations of two organisms X and Y over time, before the setting of factory and after it was shut down. Identify X and Y and select the correct option.

A X could be bacteria and Y could be fish.
B X could be prawn and Y and could be a submerged aquatic plant.
C X could be a water bird and Y could be algae.
D X could be algae and Y could be bacteria.

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Ans 1:

Sargun Maini from The Khaitan School, NOIDA

Class : Class 6

Ans 2:

Hamzah Inamdar from SHARDA ENGLISH SCHOOL KAIJ DIST BEED, KAIJ

Class : Class 4

Ans 3:

SAPTARSHI SAHA from Hemsheela Model School, Durgapur

Class : Class 8

Ans 4:

Kanishka malik from Uttam school for girls, Ghaziabad

Class : Class 4

Please explain

Ans 5:

Shreshta from Presidium, Ghaziabad

Class : Class 3

A

Ans 6:

Shreshta from Presidium, Ghaziabad

Class : Class 3

A

Ans 7: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

A

Ans 8:

Ashwak from Cambridge, Jalandhar

Class : Class 9

The correct answer is A

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RICHA BORAH from K V ANNA NAGAR, CHENNAI

Subject :NSO Class : Class 6

Read the given passage and fill in the blanks by choosing an appropriate option.
Iron nails when new are grey and bright. When exposed to (i), they get covered with a (ii) coating. This process is called (iii) and it is a (iv) change.

	(i)	(ii)	(iii)	(iv)
A	Moist air	Grey	Corrosion	Chemical, reversible
B	Air and water	Reddish brown	Rusting	Chemical, irreversible
C	Oxygen in air	Green	Rancidity	Physical, irreversible
D	Nitrogen in air	Reddish brown	Galvani-sation	Chemical, irreversible

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Aarav Gupta from Cambridge International School, Jalandhar

Subject :NSO Class : Class 6

Study the classification diagram as shown and identify
W, X, Y and Z.

	W	X	Y	Z
A	Dough	Coffee	Air	Fog
B	Clay pot	Mud	Cardboard	Water
C	Tracing paper	Water	Frosted glass	Mist
D	Wooden ruler	Dough	Tracing paper	Haze

D is the answer.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

D

Wooden ruler is opaque, and it has a definite shape. So, it can be W.

Dough is opaque, and it doesn’t have a definite shape. So, it can be X.

Tracing paper is translucent and has a definite shape. So, it can be Y.

Haze has no definite shape, and it is translucent. So, it can be Z. Hence, the correct option is D.

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Aman Singh from krishna public school, Bhilai

Subject :NSO Class : Class 8

A ball is dropped from a spacecraft revolving the earth at a height of 100 km. What will happen to the ball?

(a) It will continue to move with the same speed along the original orbit of spacecraft.
(b) It will move with the same speed, tangentially to the spacecraft.
(c) It will go very far in the space.
(d) It will fall down to earth gradually.

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Ans 1:

Ankit kumar Jha from Ryan International School , Ghaziabad

Class : Class 9

D should be the answer. because gravity pulls them

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