National Science Olympiad Forum By SOF Olympiad Trainer

ShubhamThakur from Saraswati shishu vidya mandir sec 2-A, Bokaro

Subject :NSO Class : Class 10

Identify the given developmental stage of human embryo and select the correct option regarding it.

ADevelopmental stage- Blastocyst; Site of implantation- Uterine wall
BDevelopmental stage- Morula; Site of implantation- Uterine wall
CDevelopmental stage- Blastula; Site of implantation- Mid part of Fallopian tube
DDevelopmental stage- Gastrula; Site of implantation- Mid part of Fallopian tube

Please explain

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Mishika Nair from Rajagiri public school, Qatar

Subject :NSO Class : Class 4

Unscramble the letters to find the name of a non-contact force.

A LANIOTCFIR EFROC
B RALCUMUS REFCO
C LANOITATIVARG EROFC
D TICSEAL REOFC

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Ans 1:

Aarvi Gosai from The New Tulip International School, Ahemdabad

Class : Class 4

Ans 2:

Aadya from Dps East, Bengaluru

Class : Class 4

I don't understand. Frictional force is a contact force, right?

Ans 3:

Aarvi Gosai from The New Tulip International School, Ahemdabad

Class : Class 4

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Prabhat from phoenix greens, hyderabad

Subject :NSO Class : Class 7

In the given apparatus, air is inhaled and exhaled through tube P. Tubes X and Y are closed subsequently at different times.

What will happen when
(i) Tube X is closed with a clip and air is exhaled ?
(ii) Tube Y is closed with a clip and air is exhaled ?

A(i)-Lime water in tube A will turn more milky, (ii)-Lime water in tube B will turn less milky
B(i)-Lime water in tube A will turn less milky, (ii)-Lime water in tube B will turn more milky
C(i)-Lime water in tube B will turn more milky, (ii)-Lime water in tube A will turn more milky
D(i)-Lime water in tube B will turn less milky, (ii)-Lime water in tube A will turn more milky

very beautuful question

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Ans 1:

Prabhat from phoenix greens, hyderabad

Class : Class 7

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Vanij from San, Pune

Subject :NSO Class : Class 4

Given below are figures of four types of forces. Match the images with their corresponding descriptions and choose the correct option.

(1) This force pulls everything towards the Earth.
(2) This force opposes motion between two surfaces.
(3) This force is generated by muscle action.
(4) This force helps an object return to its original shape after being deformed.

A a-3, b-4, c-2, d-1
B a-2, b-1, c-4, d-3
C a-4, b-3, c-1, d-2
D a-4, b-3, c-1, d-2

Bruh, C and D have the same options

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Ans 1:

Avnish Katti from ST. JOHN'S HIGH SCHOOL SIDDHARTH NAGAR, BORIVALI , MUMBAI

Class : Class 4

I also reported but they gave me the same questions again with that two same answers They are very mad

Ans 2:

Vanij from San, Pune

Class : Class 4

Chat box to me self!?!?!?!?

Ans 3:

Vanij from San, Pune

Class : Class 4

Bruh, C and D have the same options. I have posted an error in this. So, I want others also to have a look at this

Ans 4:

Nakul Chethan from First steps Jakkur , Bangalore

Class : Class 4

You are right ✅️

Ans 5:

Aarvi Gosai from The New Tulip International School, Ahemdabad

Class : Class 4

These Olmpiad people are CHEATERS! >:(

Ans 6:

Aarvi Gosai from The New Tulip International School, Ahemdabad

Class : Class 4

and no Vanji the chat box isn't for yourself anymore

Ans 7:

Avnish Katti from ST. JOHN'S HIGH SCHOOL SIDDHARTH NAGAR, BORIVALI , MUMBAI

Class : Class 4

They are CHEATERSSSSSSSS!!!!!!!!!!!!!!!!!!!!

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Avaneesh Barithaya from New Horizon Scholars School Vasant Lawns, Thane

Subject :NSO Class : Class 5

Refer to the given figures showing joints labelled as W, X, Y and Z. Descriptions of these joints are given. One of the descriptions about these joints is incorrect. Identify the incorrect description and select the statement that accurately corrects the mistake.

W : Found in the elbow and knee, allows movement in only one direction.
X : Found in the shoulder and hip, enables movement in all directions.
Y : Located between the first two vertebrae, allows head to turn sideways.
Z : Present in the wrist and ankle, permits only back-and-forth motion.

A Z : Present in the wrist and ankle, allows both back-and-forth and side-to-side movement.
B X : Found in the shoulder and hip, does not allow movement in all directions.
C W : Found in the elbow and knee, movement is not strictly limited to one direction.
D Y : Located between the first two vertebrae, allows the head to rotate fully.

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Aarav Kumar Panda from Mother's Public School, Bhubaneswar

Subject :NSO Class : Class 6

Read the following statements.
(I) Stars appear to move from east to west.
(II) The solar system consists of eight planets and is a host of asteroids, comets and meteors.
(III) The earth revolves around the sun in an elliptical orbit.
(IV) Pluto is also a planet.
Which of the given statement(s) is/are correct?

A I and III only
B II and III only
C I only
D II and IV only

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Ans 1:

Rihansh Gupta from St . Joseph High School , Mumbai

Class : Class 6

how is it d

Ans 2:

Aarav Kumar Panda from Mother's Public School, Bhubaneswar

Class : Class 6

Ans 3:

Avaneesh Herle P from Global Academy for Learning , Bangalore

Class : Class 6

……I don’t understand anything????

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Pragna S from APS PUBLIC SCHOOL, BASAVANAGUDI

Subject :NSO Class : Class 4

Which of the following options will complete the pattern in the given figure?

A
B
C
D

There is no pattern at all. It is your big mistake.

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Ans 1:

SHIVAANSH SATAPATHY from DPS VINDHYANAGAR, SINGRAULI

Class : Class 4

This question is wrong

Ans 2:

Vikas Jhamb from Bhawan, Chandigarh

Class : Class 4

Without pattern .I just did a guess and I got wrong this question is totally wrong

Ans 3:

Vanij from San, Pune

Class : Class 4

No pattern given here I just fluked it and got it correct. The answer which was correct is Option.B.

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Vanij from San, Pune

Subject :NSO Class : Class 4

Refer to the given flow chart and select the correct option regarding it.

	W	X	Y	Z
A	Overalls	Worn by doctors and nurses	Nauvari	Outfit worn by Kashmiri men and women
B	Black coat	Worm by lawyers	Mundu	Outfit worn by Punjabi men
C	Camouflage uniform	Worn by postman	Kediyu	Outfit worn by Bengali women
D	Khaki uniform	Worn by police officer	Chorno	Outfit worn by Keralian men

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Ans 1:

Vanij from San, Pune

Class : Class 4

Ans 2:

Vanij from San, Pune

Class : Class 4

Ans 3:

Vanij from San, Pune

Class : Class 4

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Vanij from San, Pune

Subject :NSO Class : Class 4

A company is designing outdoor sleeping bags for a camping trip. Refer to the graph below showing the properties of different materials. Which material would be most suitable for a sleeping bag that needs to retain body heat, be fire-resistant, and not absorb water?

A W
B X
C Y
D Z

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Pranav Ravi Bhandurge from Satyajeet international school mehkar, Mehkar

Subject :NSO Class : Class 7

Priyanka took a destarched potted plant and set-up an experiment as shown in the figure. She left the plant in sunlight for few hours and then tested the leaves X and Y for starch. Leaf X did not give starch test while leaf Y showed presence of starch.

What is proved by this experiment?

A Chlorophyll is necessary for photosynthesis.
B Carbon dioxide is necessary for photosynthesis.
C Sunlight is necessary for photosynthesis.
D Oxygen is given out during photosynthesis.

How I can t understand

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