National Science Olympiad Forum By SOF Olympiad Trainer - Page 508

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 5

Read the given paragraph with few blanks and select the option that correctly fills these blanks.
Plants reproduce vegetatively by different means. Plants like ______ reproduce with the help of leaves,______ and ______ reproduce by stem and ______ reproduces by roots. Some plants like mushrooms reproduce by ______.

ABryophyllum, potato, turnip, ginger, spores
BBegonia, onion, rose, sweet potato, seeds
CBryophyllum, rose, potato, turnip, spores
DBegonia, potato, onion, sugarcane, seeds


Ans 1:

Class : Class 7

Ans 2:

Class : Class 5

Ans 3:

Class : Class 5

Ans 4:

Class : Class 7

Ans 5:

Class : Class 6
c

Ans 6:

Class : Class 7

Ans 7:

Class : Class 7
I am bengali , hindi , english and malayalam . This looks pity to me !!!!!!!!!!!!!!!!!!!

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Subject :NSO    Class : Class 8

When light falls on a surface, light bounces off the surface. This is called reflection. When light falls on a smooth surface, the surface reflects the light in a well defined manner. The best example is plane mirror.
Why rose appears red in colour to our eyes?

AIt absorbs the red colour and reflects rest of the colours.
BIt absorbs the red colour and refracts rest of the colours.
CIt refracts the red colour and absorbs rest of the colours.
DIt reflects the red colour and absorbs rest of the colours.


Ans 1:

Class : Class 10
DIt reflects the red colour and absorbs rest of the colours.

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 7
d

Ans 2:

Class : Class 7
d is the answer

Ans 3:

Class : Class 6
You are right. It should be D.

Ans 4:

Class : Class 8
the correct is D.

Ans 5:

Class : Class 8
You are wrong.The correct answer should be D.

Ans 6:

Class : Class 7

Ans 7:

Class : Class 3
I think you are right it should be D.

Ans 8:

Class : Class 3
Correct answer is D

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
Ans is A because bituminous is not an ore, typhoid is not a vector-borne disease and nutcracker is not a class 1 lever.

Ans 2:

Class : Class 5

Ans 3:

Class : Class 7
The correct answer is A because Bituminous is not a ore, typhoid is a water-borne disease and rest are vector-borne disease and nutcracker is an example of 2nd class lever whereas all the other are 1st class lever.

Ans 4:

Class : Class 5
I agree Areen

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 9
the answer is b . this is because sun tan is temporary.

Ans 2:

Class : Class 9
answer is b

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Subject :NSO    Class : Class 8

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

Column I Column II
P. Nylon (i) Burns quickly with a smell of burning paper
Q. Wool (ii) Burns with sooty flame, fabric shrinks and black beads are formed
R. Acrylic (iii) Shrinks after exposure to flame, forms hard beads and gives a smell of burning hair
S. Rayon (iv) Burns slowly with a smell of burning hair


A P - (i), Q - (iv), R - (ii), S - (iii)
B P - (iii), Q - (iv), R - (ii), S - (i)
C P - (iv), Q - (iii), R - (i), S - (ii)
D P - (ii), Q - (iv), R - (iii), S - (i)


Ans 1:

Class : Class 8
Nylon does not have the smell of burning hair. So the answer should be d.

Ans 2:

Class : Class 10

Ans 3:

Class : Class 8
It should be D. Because nylon would never once burn with smell of paper in it's entire career. SOF, you gotta chnage the answer man.

Ans 4:

Class : Class 8
wool burns with smell of burning hair

Ans 5:

Class : Class 9
yes the answer is D. nylon burns with a smell of celery because its a synthetic fibre.

Ans 6:

Class : Class 9
Supposed to be D

Ans 7:

Class : Class 9
IT must be D! Nylon does not burn with the smell of burning hair as it is purely synthetic and has no relation to the protein based hair.

Ans 8:

Class : Class 8
IT SHOU BE D!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Ans 9:

Class : Class 8
Nylon should neither have a smell of burning hair nor the smell of burning paper. Nylon has a celery or plastic-like cell. Hence the correct answer is D. But on the other hand when acrylic burns, it shrinks and converts into black beads. On this contrast, the correct answer will be B with respect to acrylic and D with respect to Nylon. There is definitely an error in the options of the answers!

Ans 10:

Class : Class 8
Correct answer is A

Ans 11:

Class : Class 8
How is this possible Nylon burns with smell of hair???

Ans 12:

Class : Class 9
How can Nylon burn with the smell of burning hair??

Ans 13:

Class : Class 9
nylon burns with a smell of plastic, not burning hair. WTF?

Ans 14:

Class : Class 9
wrong answerthe answer should be B

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

Ans 2:

Class : Class 6
There is no explanation for the answer. How do we understand sof?

Ans 3:

Class : Class 4
Air always act as Frictional force against Gravity Hence ans is B in this case

Ans 4:

Class : Class 8

Ans 5:

Class : Class 9

Ans 6:

Class : Class 5
But they are telling that the right answer is option d

Ans 7:

Class : Class 4
There is no explanation for the answer. How do we understand sof?

Ans 8:

Class : Class 4

Ans 9:

Class : Class 8
I think c

Ans 10:

Class : Class 4
qwertyuiopasdfghjkkklzxcvbnm

Ans 11:

Class : Class 9

Ans 12:

Class : Class 6
Yea, pls explain this question to us SOF admin

Ans 13:

Class : Class 9
there is air friction against gravity. so answer is B

Ans 14:

Class : Class 9

Ans 15:

Class : Class 4

Ans 16:

Class : Class 4
THERE IS NO SOLUTION SOB HOW CAN WE UNDERSTAND

Ans 17:

Class : Class 8
Kqwertyuiopasdfghjklzxcvbnm,.-/:;(₹

Ans 18:

Class : Class 4
@ishi gupta i know this is irrevelent but its not sob its sof

Ans 19:

Class : Class 8

Ans 20:

Class : Class 4
qwertyuiopasdfghjklzxcvbnm,.-/:;(â1

Ans 21:

Class : Class 4

Ans 22:

Class : Class 6
There is no explanation for the answer. How do we understand Sof?

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
A

Ans 2:

Class : Class 5
The answer could be both A or B because wheel barrows and screwdrivers are levers and wheel and axles

Ans 3:

Class : Class 5
Yes

Ans 4:

Class : Class 9
why not B all the options are levers

Ans 5:

Class : Class 5

Ans 6:

Class : Class 9
the answer is A

Ans 7:

Class : Class 7
I

Ans 8:

Class : Class 6
A

Ans 9:

Class : Class 4
l

Ans 10:

Class : Class 5
Answer is A

Ans 11:

Class : Class 5

Ans 12:

Class : Class 5

Ans 13:

Class : Class 5
Answer is A

Ans 14:

Class : Class 7
Aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa

Ans 15:

Class : Class 6
A

Ans 16:

Class : Class 5
A

Ans 17:

Class : Class 5
AAAAAAAAAAAAAAAAA!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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