National Science Olympiad Forum By SOF Olympiad Trainer - Page 649

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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


Ans 1:

Class : Class 6
i did c because they are from seeds too but most are stems so d

Ans 2:

Class : Class 8

Ans 3:

Class : Class 6
The correct answer is (D) as jute is the cheapest fibre . and stem of the flax plant provides fibres

Ans 4:

Class : Class 8
cotton' is the cheapest natural fibre

Ans 5:

Class : Class 5

Ans 6:

Class : Class 6
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 7:

Class : Class 6
I think cotton is the cheapest, but the answer says jute is cheapest. So which is right C or D?

Ans 8:

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 9:

Class : Class 8
Flax is obtained from stem and jute is the cheapest natural fibre . So , the answer is D

Ans 10:

Class : Class 8

Ans 11:

Class : Class 8

Ans 12:

Class : Class 9
Answer is d

Ans 13:

Class : Class 6
The answer is not b

Ans 14:

Class : Class 7
I think that cotton is the cheapest natural material , not jute and so does a sof help desk employee

Ans 15:

Class : Class 6

Ans 16:

Class : Class 7
The answer is b right?

Ans 17:

Class : Class 7
Cotton is the cheapest right??

Ans 18:

Class : Class 6
Jute is the cheapest natural fibre,not cotton!

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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


Ans 1:

Class : Class 9
angora wool is obtain by angora rabbit and not angora sheep. Coir is the outer covering of coconut

Ans 2:

Class : Class 6

Ans 3:

Class : Class 7

Ans 4:

Class : Class 6
angora wool is obtain by angora rabbit and not angora sheep. Coir is obtained by the husk of a coconut

Ans 5:

Class : Class 9
correct answer is a

Ans 6:

Class : Class 6
The correct answer is (A)

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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.


Ans 1:

Class : Class 9

Ans 2:

Class : Class 6

Ans 3:

Class : Class 6

Ans 4:

Class : Class 6
cotton fibre is obtained from the fruit of the cotton plant

Ans 5:

Class : Class 8
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 6:

Class : Class 6

Ans 7:

Class : Class 10

Ans 8:

Class : Class 6

Ans 9:

Class : Class 7
there were multiple wrong answers

Ans 10:

Class : Class 6

Ans 11:

Class : Class 9
d

Ans 12:

Class : Class 3
Cotton is not obtained from seed of plant so cotton can not be S!

Ans 13:

Class : Class 1

Ans 14:

Class : Class 8
Bengluru poor science schools

Ans 15:

Class : Class 6

Ans 16:

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.

Ans 17:

Class : Class 8

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 7
Yesssssssssssss

Ans 2:

Class : Class 5
yessssssssssssssssss

Ans 3:

Class : Class 4

Ans 4:

Class : Class 3
Yessssss

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Subject :NSO    Class : Class 4

Ans 1:

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.

Ans 2:

Class : Class 5
Thanks Aamena

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Subject :NSO    Class : Class 9

Ans 1:

Class : Class 9
Option D

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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


Ans 1:

Class : Class 9
Option A

Ans 2:

Class : Class 7
a

Ans 3:

Class : Class 10
opt c is correct

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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


Ans 1:

Class : Class 9
What is centrifugation

Ans 2:

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 3:

Class : Class 6
the answer is A.

Ans 4:

Class : Class 8

Ans 5:

Class : Class 6
The answer is A

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 7
becase in the figure all the letters seem to be in the opposite direction while options a b and d are not showing them in th opposite direction and option c is showing

Ans 2:

Class : Class 8
Yes , the answer is C .

Ans 3:

Class : Class 3
The question has all mirror images...... So answer has to be a mirror image.

Ans 4:

Class : Class 7
option c is opposite like all the letters in the figure

Ans 5:

Class : Class 5
c as it is facing opposite side

Ans 6:

Class : Class 8

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Subject :NSO    Class : Class 3

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