National Science Olympiad Forum By SOF Olympiad Trainer

Dishita Saha from Mother Teresa Public School, Delhi

Subject :NSO Class : Class 8

. If ‘+’ means ‘×’, ‘–’ means ‘÷’, ‘×’ means ‘–’ and ‘÷’ means ‘+’, then what will be the value of 16 ÷ 64 – 8 × 4 + 2 = ? (A) 18 (B) 14 (C) 24 (D) 16

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Kushal from Chirec, Hyderabad

Subject :NSO Class : Class 7

Three solutions of different substances P, Q and R gave the following results with different indicators.
Solution P : Turns methyl orange to red.
Solution Q : Turns turmeric solution red.
Solution R : Turns phenolphthalein solution pink.
Identify the solutions P, Q and R respectively.

AAntacid, soap solution, lemon juice
BBaking soda, shampoo, antacid
CLemon juice, sodium hydroxide, baking soda
DVinegar solution, antacid, lemon juice

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Ans 1:

Prabhat from phoenix greens, hyderabad

Class : Class 7

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VISHNU T M from b, Bengaluru

Subject :NSO Class : Class 8

Read the following statements carefully.
X : It is a fossil fuel used in thermal power plants to produce electricity.
Y : It is a porous, black and almost pure form of carbon.
Z : It is a mixture of about 200 substances.
X, Y and Z are respectively

A Petroleum, coal gas, coke
B Coal, coke, coal tar
C CNG, bitumen, diesel
D Coal gas, petrol, paraffin wax.

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Rikhil Taneja from IVY World School, Jalandhar

Subject :NSO Class : Class 9

Observe the given flow chart and answer the following questions. What are a and b?

A a = multiply by 22.4 L, b = multiply by 22.4 L
B a = multiply by 22.4 L, b = divide by 22.4 L
C a = divide by 22.4 L, b = divide 22.4 L
D a = divide by 22.4 L, b = multiply by 22.4 L

Explanation please

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VISHNU T M from b, Bengaluru

Subject :NSO Class : Class 8

Which of the following is/are incorrect statement(s) regarding manure?
(i) Manure enhances the water holding capacity of the soil.
(ii) Manure is nutrient specific i.e. supply a particular desired nutrient.
(iii) Manure decreases the number of friendly microbes.
(iv) Manure improves the texture of the soil.
(v) Manure is prepared by the decomposition of dead plant and animal matter.

A (i), (iii) and (v) only
B (v) only
C (ii), (iii), (iv) and (v) only
D (ii) and (iii) only

ANSWER IS D.

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Ans 1:

VISHNU T M from b, Bengaluru

Class : Class 9

Ans 2:

VISHNU T M from b, Bengaluru

Class : Class 9

D

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Aryaman m from Podar international school bangalore, Bangalore

Subject :NSO Class : Class 3

To break a glass tile by hands, one needs to use one’s __________ system.

A Reproductive
B Skeletal
C Muscular
D Both (B) and (C)

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Ans 1:

Avighna Shastri from doha modern indian school, doha

Class : Class 2

Correct answer is D

Ans 2:

SIDDHARTH SOMANI from Vibgyor High, Mumbai

Class : Class 5

Correct answer is D from VIBGYOR HIGH Siddharth Somani

Ans 3:

Iraj Singh from DPS Megacity, Kolkata

Class : Class 9

The correct answer is D.

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Harshith Reddy from KKIS, Singapore

Subject :NSO Class : Class 2

The given picture shows which occasion in the family?

A Birthday celebration
B Anniversary
C Wedding
D Housewarming party

some religion weddings bridegroom sitting on horse

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Ans 1:

Adhrit Das from Inventure Academy, Bangalore

Class : Class 3

Ans 2:

Adhrit Das from Inventure Academy, Bangalore

Class : Class 3

it is a wedding, it should be b!

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AKSHAJ SRIVASTAVA from MOUNT LITERA ZEE SCHOOL, Kanpur

Subject :NSO Class : Class 3

Mani tried to pick the coffee mug but quickly pulled her hand back as the mug was hot. She used her sense of_________.

A Hearing
B Seeing
C Touching
D Tasting

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Ans 1:

Ivan Tyagi from Chirec International School , Hyderabad

Class : Class 8

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AKSHAJ SRIVASTAVA from MOUNT LITERA ZEE SCHOOL, Kanpur

Subject :NSO Class : Class 3

Naveen fainted in school playground while playing. The doctor said that his brain did not get proper oxygen supply.
It means that his _________ system may have a problem.

A Reproductive
B Circulatory
C Skeletal
D Excretory