National Science Olympiad Forum By SOF Olympiad Trainer

Kushal from Chirec, Hyderabad

Subject :NSO Class : Class 6

Which among the following statements is incorrect?

ACigarette paper is commonly made from flax fibre.
BSilk is obtained from larva of silkworm, fed on leaves of mulberry trees.
CCotton grows well in black soil rich in humus.
DCoir is obtained from husk, which is separated from coconut by soaking them in water.

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Ans 1:

Amrik Pal from Kendriya Vidyalaya DRDO, Bangalore

Class : Class 7

B

Ans 2:

SHUBHANG SINGH from DELHI PUBLIC SCHOOL REWARI, REWARI

Class : Class 6

ALL OPTIONS ARE CORRECT

Ans 3:

Prateek panigrahi from D a v public school jharsuguda, Jharauguda

Class : Class 2

All are correct

Ans 4:

Prateek panigrahi from D a v public school jharsuguda, Jharauguda

Class : Class 2

B

Ans 5:

Arjunkrishnan Nambiar from chinmaya vidyalaya, kannur

Class : Class 6

All are correct

Ans 6:

Aarav Gupta from Cambridge International School, Jalandhar

Class : Class 6

b

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Kushal from Chirec, Hyderabad

Subject :NSO Class : Class 6

Read the given passage and select the option which correctly fills any three of the blanks. (i) is the main source of water on Earth however (ii) , is considered more pure than (i) as it is free from contaminants. City roads flooded with water, dry up due to the process of (iii) . Rate of (iii) increases with (iv) in temperature. The process of (v) changes water vapour present in air into water. (iii) and (v) help in circulating water between hydrosphere and atmosphere.

A(i)-Groundwater, (ii)-Rainwater, (iv)-Decrease
B(ii)-Underground water, (iii)-Evaporation,(v)-Transpiration
C(i)-Surfacewater, (ii)-Groundwater,(iv)-Decrease
D(ii)-Groundwater, (iv)-Increase,(v)-Condensation

View All Answers (3)

Ans 1:

Subhang Deep Sahu from Narayana CO Kadugodi Bangalore, Bangalore

Class : Class 8

Ans 2:

SHUBHANG SINGH from DELHI PUBLIC SCHOOL REWARI, REWARI

Class : Class 6

RAINWATER IS PUREST FORM OF NATURAL WATER

Ans 3:

Aaradhya Sharma from Ryan, Bangalore

Class : Class 8

Rain water is the purest form of water

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Kushal from Chirec, Hyderabad

Subject :NSO Class : Class 6

A pendulum takes 0.8 seconds to swing from the extreme points A to B. What will be the time taken for the pendulum to make 15 oscillations ?

A12 seconds
B24 seconds
C36 seconds
D48 seconds

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Ans 1:

SHARWAKSH S TIWARY from ANAND NIKETAN BHADAJ CAMPUS, AHMEDABAD

Class : Class 6

this

Ans 2:

Srithvik from BVBARR, hyderabad

Class : Class 8

Ans 3:

Vamsi Krishnan R from CMR NPS, Bangalore

Class : Class 6

Ans 4:

Srithvik from BVBARR, hyderabad

Class : Class 8

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Manoj Sohan Gajula from Vibgyor High, Bangalore

Subject :NSO Class : Class 7

Read the following statements and select the correct option.
Statement 1 : It is not possible to photograph a virtual image.
Statement 2 : An image is said to be virtual if the reflected or refracted rays are diverging in nature.

A Both statement 1 and statement 2 are true and statement 2 is the correct explanation of statement 1.
B Both statement 1 and statement 2 are true but statement 2 is not the correct explanation of statement 1.
C Statement 1 is true but statement 2 is false.
D Statement 1 is false but statement 2 is true.

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Ans 1:

Midhuna from ABCD, Banglore

Class : Class 3

both r not correct

Ans 2:

Adhrit from CHSV, Chennai

Class : Class 8

Virtual images is NOT defined correctly, because in a plane mirror parallel rays of light stay parallel. There is no divergence, but it's still a virtual image formed. So the correct answer should be both statements are false, which isn't an option for some reason

Ans 3:

shashwat pandey from Doon International School Dalanwala, Dehradun

Class : Class 8

Ans 4:

Mohit Ahuja from Podar International School, Akola

Class : Class 9

(D) opt as we can definitely capture image of virtual image when we take photo of the mirror and the virtual image is defined correctly

Ans 5:

SAMPAD BANERJEE from DELHI PUBLIC SCHOOL , BILASPUR

Class : Class 9

Ans 6:

arnav raj sharma from gulibulium school, new york

Class : Class 8

the correct answer is (b) as a virtual image cannot be captured on a screen which means it cant be photographed so statement 1 is correct and a virtual image is formed by a convex mirror and It has diverging rays so a virtual image can also be defined as an image formed by diverging rays so statement two is correct but the reason for first statement is that a virtual image cannot be captured on a screen so (b) is the correct answer

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Admin fly from Ddssxxx, Ax

Subject :NSO Class : Class 6

'X' is a gas which is required by producers to prepare their food. Select the incorrect statement regarding 'X'.

AIt constitutes 0.03% of air in atmosphere.
BIt turns lime water milky.
CIt is an important component of fertilisers.
DIt extinguishes fire.

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Ans 1:

Kushal from Chirec, Hyderabad

Class : Class 7

c as carbon dioxide is not used as a fertilizer

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Simar Narula from Rishi Coaching Institute , Jaipur

Subject :NSO Class : Class 8

An equilibrium state of a body is considered if all the forces acting on it

A Are in the same direction
B Are equal in magnitude
C Have zero resultant
D Can be arranged in pairs.

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Bhavya Jain from K R Mangalam World Scholl, GHAZIABAD

Subject :NSO Class : Class 4

Select the INCORRECT statement.

A Overcooking destroys nutrients hence food should not be overcooked.
B All vegetables and fruits must be cooked before eating.
C Sugaring, salting and oiling food slow down growth of microbes on it.
D All of these

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Ans 1:

Ibrahim Aslam from uttam, Ghaziabad

Class : Class 2

The food should not be over cooked

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Bhavya Jain from K R Mangalam World Scholl, GHAZIABAD

Subject :NSO Class : Class 4

Select the option that on unscrambling gives the name of a clothing item worn in summers.

A RFMUFLE
B WASTERE
C OSTHSR
D NADGCRIA

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Ans 1:

Ibrahim Aslam from uttam, Ghaziabad

Class : Class 2

What is cardigan? I don't know what

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Admin fly from Ddssxxx, Ax

Subject :NSO Class : Class 6

Study the given classification chart of plant fibres. Plant fibres

Which of the following holds true for P, Q, R and S?

AP could be flax or jute.
BP and Q are biodegradable whereas R and S are non-biodegradable.
CQ could be coir whereas S could be sisal.
DBoth A and C

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Adersh from Apeejay, Nerul

Subject :NSO Class : Class 3

Select the option that correctly satisfies the same relationship based on their feeding habit.

A Lion : Cow
B Rabbit : Frog
C Cat : Mosquito
D Dog : Buffalo

SQURRIEL IS AN OMNIVORE.PLEASE EXPLAIN.

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Ans 1:

Prithwanko Ghosh from Kendriya Vidyalaya IIT Kanpur, Kanpur

Class : Class 9

In the figure there is a squirrel and snake so, squirrel gnaws and snake swallows so, rabbit and frog in option (B) so, rabbit gnaws and frog swallows so, option (B) is the correct answer.

Ans 2:

Mohi from Vibgyor, Bangalore

Class : Class 6

B. Rabbit gnaws and frog swallows.

Ans 3:

SAMRIDDHA PANDA from ST. MONFORT'S SENIOR SECONDARY SCHOOL, BARUIPUR

Class : Class 7

Ans 4:

ANSHUL GAJJAR from PODAR INTERNATIONAL SCHOOL, AHMEDABAD

Class : Class 3

B

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