National Science Olympiad Forum By SOF Olympiad Trainer - Page 762

User Forum

Ask Your Question

Select Class:

Rishit Verma from CMR NPS, Bengaluru

Subject :NSO Class : Class 6

Match column I with column II and select the correct option from codes given below.

Column I	Column II
(i) Ginning	(A) Cleaning and disentangling the fibres
(ii) Combing	(B) Brushing and straightening of fibres
(iii) Carding	(C) Bolls
(iv) Seed pods	(D) Cotton fibres after being separated from seeds
(v) Lint	(E) Separating fibres from seed

A(i) - (e); (ii) - (b); (iii) - (a); (iv) - (c); (v) - (d)
B(i) - (d); (ii) - (e); (iii) - (b); (iv) - (a); (v) - (c)
C(i) - (e); (ii) - (a); (iii) - (b); (iv) - (c); (v) - (d)
D(i) - (d); (ii) - (a); (iii) - (b); (iv) - (c); (v) - (e)

Ans 1:

SJ HARITHA from PSNLO, BENGALURU

Class : Class 10

Ans 2:

pradeep718 from DPS Internation, Singapore

Class : Class 2

Answer : A

Ans 3:

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

Class : Class 9

Ans 4:

pranil mishra from KVS, bhubaneswar

Class : Class 10

Ans 5:

Kartik Chauhan from Euro school , Pune

Class : Class 7

Ans 6:

Vibhav Hatwal from Learning Paths School, Mohali

Class : Class 9

aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Ans 7:

Manvi Mundepi from Montfort School Roorkee, Roorkee

Class : Class 9

Ans 8:

Vatsal Gupta from Mondrian House, DEHRADUN

Class : Class 6

Ans 9:

HIMANISH BASU from APS BANGALORE , Bangalore

Class : Class 7

Ans 10:

Saanvi from rvk, bengaluru

Class : Class 9

the correct answer is a

Ans 11:

Sidharth Maheshwari from Pathways School Gurgaon, Gurugaon

Class : Class 6

Ans 12:

Valli Rams from Blossom Public School, Thanjavur

Class : Class 10

Ans 13:

Anoushka Chhauda from Sanskriti, Pune

Class : Class 8

Ans 14:

PAYAL from DPS BHILAI, BHILAI

Class : Class 8

very important question .the main fanda is to understand the question/words. the answer is option A

Ans 15:

Valli Rams from Blossom Public School, Thanjavur

Class : Class 10

Ans 16:

Anoushka Chhauda from Sanskriti, Pune

Class : Class 8

Ans 17:

NILARKA PAHARI from Young Horizons School, KOLKATA

Class : Class 6

very confusing question. Answer is option a.

Post Your Answer

Rishit Verma from CMR NPS, Bengaluru

Subject :NSO Class : Class 6

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

A X – Flax, Y – Silk
B W – Cotton, Y – Silk
C W – Flax, Z – Wool
D X – Jute, Z – Wool

Ans 1:

Ritvik Nainawatee from Freedom International School, BANGALORE

Class : Class 6

Answer should be (c). Flax is obtained from stem of flax stem and wool is obtained without harming the sheep

Ans 2:

Amara Bhatia from HFSI, Mumbai

Class : Class 7

answer should be [d] since Jute comes from the stem of the jute plant and wool is sheared from sheeps etc. without harming the animal.

Ans 3:

Apeksha Singh from Cambridge School , Noida

Class : Class 3

Answer is option - (C)

Ans 4:

Sujal Satish Motagi from AJ Public School, Bengaluru

Class : Class 9

Answer is (c). Because flax is used to make linen which is obtained from flax stem. Wool is made from sheep's hair without harming it.

Ans 5:

SAMRA BISWAS from KENDRIYA VIDYALAYA BARRACKPORE AIRFORCE, BARRACKPORE

Class : Class 9

Answer should be C ......

Ans 6:

Sarvesh I from Chennai Public School, Chennai

Class : Class 6

ANS is (a)and(c)Flax is obtained from plant stemSilk is obtained by harming silkworm

Post Your Answer

Rishit Verma from CMR NPS, Bengaluru

Subject :NSO Class : Class 6

Select the option that correctly fills the blanks in the given sentences.
(A) (i) of a flax plant provides fibres.
(B) (ii) is the cheapest natural fibre.
(C) The process of separating cotton fibres from cotton seeds is called (iii).
(D) (iv) is obtained by spinning together a bunch of fibres.
(E) (v) is a blended fabric.
(F) The loose fluffy fibres are untangled and combed to form a long soft rope called a (vi).

	(i)	(ii)	(iii)	(iv)	(v)	(vi)
A	Seed	Jute	Retting	Yarn	Terry-cot	Sliver
B	Stem	Cotton	Retting	Yarn	Terry-cot	Sliver
C	Seed	Cotton	Ginning	Yarn	Terry-cot	Sliver
D	Stem	Jute	Ginning	Yarn	Terry-cot	Sliver

View All Answers (18)

Ans 1:

Mrityunjay from Heritage International Xperiential School, Gurugram

Class : Class 8

I think Cotton is the cheapest fibre and someone from SOF help desk also says the same and the process of seperating cotton from cotton seeds is called Ginning only

Ans 2:

archit from Chinmaya Vidyalaya, Raibareli

Class : Class 8

Ans 3:

Aditya Kaushal from Delhi Public School Ruby Park , Kolkata

Class : Class 7

I think that cotton is the cheapest natural material , not jute and so does a sof help desk employee

Ans 4:

B HARI PAVAN from BHAVAN'S ARR SCHOOL, HYDERABAD

Class : Class 6

I think cotton is the cheapest, but the answer says jute is cheapest. So which is right C or D?

Ans 5:

Shourya Ganesh from The Green Acres Academy, Mumbai

Class : Class 9

Answer is d

Ans 6:

Ritvik Nainawatee from Freedom International School, BANGALORE

Class : Class 6

Ans 7:

amogh from DELHI PUBLIC SCHOOL NOIDA, Ghaziabad

Class : Class 6

The correct answer is (D) as jute is the cheapest fibre . and stem of the flax plant provides fibres

Ans 8:

SOUMYA SHAMBHAVI JHA from PODAR INTERNATIONAL SCHOOL, MUMBAI

Class : Class 6

The answer is not b

Ans 9:

Sof Team from Sof Olympiad Trainer Helpdesk, Bangalore

Class : Class 7

cotton' is the cheapest natural fibre

Ans 10:

Snigdha swaminath from Christ nagar higher secondary school , Trivandrum

Class : Class 7

The answer is b right?

Ans 11:

SOUMYA SHAMBHAVI JHA from PODAR INTERNATIONAL SCHOOL, MUMBAI

Class : Class 6

Jute is the cheapest natural fibre,not cotton!

Ans 12:

Snigdha swaminath from Christ nagar higher secondary school , Trivandrum

Class : Class 7

Cotton is the cheapest right??

Ans 13:

Aadvik saini from Mvn sector 17, Faridabad

Class : Class 8

Ans 14:

Utkarsh Chakravarty from Pinnacle High International School, Mumbai

Class : Class 6

i did c because they are from seeds too but most are stems so d

Ans 15:

Apeksha Singh from Cambridge School , Noida

Class : Class 3

The Answer is option D because Jute is known as the golden fibre and the process mentioned in the question is known as ginning

Ans 16:

Ahamed Shayaan from Sree Gokulam public school , Calicut

Class : Class 7

Ans 17:

Ashwak from Cambridge, Jalandhar

Class : Class 9

Flax is obtained from stem and jute is the cheapest natural fibre . So , the answer is D

Ans 18:

archit from Chinmaya Vidyalaya, Raibareli

Class : Class 8

Submit Your Answers

Post Your Answer

Rishit Verma from CMR NPS, Bengaluru

Subject :NSO Class : Class 6

Consider the following statements (i - iv) and select the option that correctly identifies true (T) and false (F) ones.
(i) Angora wool is obtained from Angora sheep.
(ii) Spinning is the process of changing fibre into yarn.
(iii) Coir is obtained from fruits of Kapok tree.
(iv) The process of removing hair from the sheep is called shearing.
(v) Knitting can be done by using only one yarn.

	(i)	(ii)	(iii)	(iv)	(v)
A	F	T	F	T	T
B	T	F	F	T	T
C	F	F	T	T	T
D	F	F	F	T	T

View All Answers (6)

Ans 1:

Ojaswi from SAINT JOHNS CONVENT SCHOOL LANSDOWNE, DELHI

Class : Class 6

angora wool is obtain by angora rabbit and not angora sheep. Coir is the outer covering of coconut

Ans 2:

UMA Subramanian from Global Indian International School, Singapore

Class : Class 7

Ans 3:

Jahnvi Bajpai from Vibgyor High, Banagalore

Class : Class 6

angora wool is obtain by angora rabbit and not angora sheep. Coir is obtained by the husk of a coconut

Ans 4:

Aadhira from velammal new gen school, Medavakkam, Chennai

Class : Class 6

The correct answer is (A)

Ans 5:

Anushka Srivastava from Cjm, Dehradun

Class : Class 7

Ans 6:

Saanvi from rvk, bengaluru

Class : Class 9

correct answer is a

Submit Your Answers

Post Your Answer

Rishit Verma from CMR NPS, Bengaluru

Subject :NSO Class : Class 6

Refer to the given flow chart and select the incorrect option regarding P, Q, R and S.

A P is a protein fibre whereas Q, R and S are cellulosic fibres.
B Retting is involved in processing of Q whereas ginning is involved in processing of S.
C P could be wool, Q could be jute, R could be sisal and S could be cotton.
D Fabrics made from P and S are excellent winter clothings whereas fabrics made from Q and R form excellent summer clothings.

View All Answers (17)

Ans 1:

Dushyant Singh from Shree Ram Centenial School, Indore

Class : Class 9

Ans 2:

Kashvi Rawat from Gear Innovative International School, Bengaluru

Class : Class 3

Cotton is not obtained from seed of plant so cotton can not be S!

Ans 3:

Aahan Jain from ,

Class : Class 1

Ans 4:

Saipriya from Sankara, Chennai

Class : Class 9

how can wool/silk and cotton be excellent winter clothing. WOrst option. And Nishka Rawat - Fibres from cotton are obtained from seeds. WOrst science readers................. Worst option too for Sof trainer

Ans 5:

Kanishk Mukherjee from BDM International, Kolkata

Class : Class 6

cotton fibre is obtained from the fruit of the cotton plant

Ans 6:

Hamsavarshini Swaminathan from St Anns Senior Secondary School, Roorkee

Class : Class 10

Ans 7:

Kanishk Mukherjee from BDM International, Kolkata

Class : Class 6

Ans 8:

Darsh Singh from The Deens Academy, Bengaluru

Class : Class 6

Ans 9:

Saipriya from Sankara, Chennai

Class : Class 9

Bengluru poor science schools

Ans 10:

Rishit Verma from CMR NPS, Bengaluru

Class : Class 6

Ans 11:

Dushyant Singh from Shree Ram Centenial School, Indore

Class : Class 9

Ans 12:

Madhav from Kendriya Vidyalaya Ernakulam, Ernakulam

Class : Class 8

Ans 13:

Kanishk Mukherjee from BDM International, Kolkata

Class : Class 6

Ans 14:

Rishit Verma from CMR NPS, Bengaluru

Class : Class 6

Ans 15:

Rayansh Mishra from VIBGYOR HIGH MAGARPATTA, Pune

Class : Class 10

there were multiple wrong answers

Ans 16:

Kanishk Mukherjee from BDM International, Kolkata

Class : Class 6

Ans 17:

Krithi Manasvini from Alwin Memorial Public School, Chennai

Class : Class 7

The correct Ans is D because In the given flow chart, P is an animal fibre like wool or silk. Q could be jute, flax or hemp. R is sisal and S is cotton. Wool is used in winter clothing while cotton is used for summer clothing. Plant stem fibres like jute, flax, hemp are generally used for making bags, ropes, carpets, etc. Sisal which is a leaf fibre is also used for almost same purposes.

Submit Your Answers

Post Your Answer

prarthana nath from Gundecha education academy, Mumbai

Subject :NSO Class : Class 3

The shape of the Moon seems to be changing. What shape of the Moon is expected to appear when:
a. The Moon is between the Earth and the Sun?
b. The side of the Moon facing the Earth is fully illuminated by the Sun?

----------a-----------------b

please give me logic of ans A.I THINK ITS B.

View All Answers (5)

Ans 1:

Arjun Gourineni from CHIREC International School, Hyderabad

Class : Class 7

Yesssssssssssss

Ans 2:

Darshini Chakravarty from Pinnacle High International School, Mumbai

Class : Class 4

Ans 3:

Anagh Agrawal from Billabong high, JABALPUR

Class : Class 3

Yessssss

Ans 4:

Riddhiman Bose from Don Bosco School, Kolkata

Class : Class 5

yessssssssssssssssss

Ans 5:

Santina Suzanne from owis, bangalore

Class : Class 4

it is very hard

Submit Your Answers

Post Your Answer

Kavitharini Joseph from HUS, Chennai

Subject :NSO Class : Class 4

Naziya poured 100 mL of boiling water into 4 containers of similar size and material from one to another in the order of a, b, c and d as shown here. Which containers have highest and lowest temperature, respectively?

A d and c
B d and b
C a and d
D a and b

I don't understand.

View All Answers (2)

Ans 1:

Sashriti Das from Delhi Public School Bangalore North, Bangalore

Class : Class 5

Thanks Aamena

Ans 2:

Aamena Shahid Ansari from St. Xavier's high school, Vapi, Gujarat

Class : Class 4

The answer is option “c”. see it was boiling water, she poured first into container “a” so it will be having the highest temperature than she poured to container b than to c and finally to container d so during this experiment the boiling water goes to lowest temperature and the last container was container d . So container a will be having the highest temperature and container d will be having the lowest temperature.

Submit Your Answers

Post Your Answer

Garima shokeen from N K Bagrodia Public School, New Delhi

Subject :NSO Class : Class 9

Some water falling on ground, forms an extremely thin, tightly held film around the soil particles called ________ while some water moves down upto the water table and is called ________.
Select the option that correctly fills the blanks in the above statement.

A Gravitational water, capillary water
B Hygroscopic water, surface runoff
C Hygroscopic water, gravitational water
D Capillary water, surface runoff

View All Answers (1)

Ans 1:

Shalin Jain from NKDAV Sidheegram, Sidheegram

Class : Class 9

Option D

Submit Your Answers

Post Your Answer

Garima shokeen from N K Bagrodia Public School, New Delhi

Subject :NSO Class : Class 9

Refer to the given key and answer the following questions.
(i) Membrane with definite pores - P
(ii) Inner membrane with stalked particles - Q
(iii) Inner membrane connected into stacks like structures - R
(iv) Sac like organelle containing hydrolytic enzymes - S
(v) Membraneless organelle composed of one large and one small subunit. - T Select the option that correctly identifies any of these organelles.

A P - Nucleus, Q - Mitochondrion, S - Ribosome
B Q - Chloroplast, R - Mitochondrion, T - Ribosome
C R - Chloroplast, S - Lysosome, T - Ribosome
D P - Nucleus, Q - Chloroplast, R - Mitochondrion

View All Answers (3)

Ans 1:

Shrestha Dutta from Julien Day School, KALYANI

Class : Class 10

opt c is correct

Ans 2:

Shalin Jain from NKDAV Sidheegram, Sidheegram

Class : Class 9

Option A

Ans 3:

SAKSHI KOTHARI from NAVRACHNA SCHOOL SAMA, Vadodara

Class : Class 7

Submit Your Answers

Post Your Answer

AKSHITA DIXIT from R K SARDA VIDYA MANDIR, RAIPUR

Subject :NSO Class : Class 6

A few statements about centrifugation method are given :
I. The mixture containing very small suspended particles is rotated at a high speed in a centrifuge machine.
II. The denser particles stay at the top.
III. The method is used to separate water from wet clothes in a washing machine.
IV. The method can be used in laboratories for separating plasma and platelets.
The correct statements are

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

View All Answers (5)

Ans 1:

Atul Sanjeev from Indian School Al Ghubra, Muscat

Class : Class 9

What is centrifugation

Ans 2:

Advait talnikar from Dhruv Global School, Sangamner

Class : Class 6

The answer is A

Ans 3:

SOUMYA SHAMBHAVI JHA from PODAR INTERNATIONAL SCHOOL, MUMBAI

Class : Class 6

centrifugation is a process in which a substance is spun at a very high speed to separate minute particles. For eg. Blood is spun at a high speed to separate particles such as red and white blood cells, plasma platelets, and plasma.

Ans 4:

Anika Saha from New Town School, KOLKATA

Class : Class 6

the answer is A.

Ans 5:

Srinwanti from Ekya, bangalore

Class : Class 8