National Science Olympiad Forum By SOF Olympiad Trainer

Sourasis kundu from St.agnes higher secondary School, Kharagpur

Subject :NSO Class : Class 7

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

Column I	Column II
(P) Dipping iron sheets in molten zinc	(i) Alloying
(Q) Prevents the iron surface to come in contact with moisture	(ii) Galvanisation
(R) Two or more metals are mixed in definite ratio to form a homogeneous mixture	(iii) Tinning
(S) Coating expensive utensils with tin	(iv) Painting

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

electroplating

Ans 1:

Aadvik saini from Mvn sector 17, Faridabad

Class : Class 8

C is the answer

Ans 2:

Maanasa from Billabong high, Chennai

Class : Class 7

ya Preethi this makes no senseeven google said that d is the answer

Ans 3:

Preethi from KKIS, Singapore

Class : Class 7

how is c the answer lmao but there is no solution. How am I suppose to understand

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Anamkhan Mulla from Navrachna Sama, Vadodara

Subject :NSO Class : Class 6

The given graph represents how three different living organisms (X, Y and Z) cope with the external environmental conditions. Study the graph and select the correct option regarding X, Y and Z.

A X could be a mammal.
B Y could be a bird.
C Z could be a mammal.
D X could be a bird.

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Ans 1:

Punya Paras Sundrani from Anand Niketan , Ahmedabad

Class : Class 7

ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd

Ans 2:

Ananya from GIIS, Bangalore

Class : Class 6

explanation please

Ans 3:

Anamkhan Mulla from Navrachna Sama, Vadodara

Class : Class 7

Ans 4:

Rishi Ranjan from Phoenix Greens School Of Learning, Hyderabad

Class : Class 6

Ans 5:

Rishik De Sarkar from Delhi Public School Gurgaon, Gurgaon

Class : Class 7

wut

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Agnish Chakraborty from The Heritage School, Kolkata

Subject :NSO Class : Class 3

Select the correct match of the place and the houses commonly found there.

A – Assam
B – Kashmir
C – Uttar Pradesh
D All of these

All of these

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Ans 1:

Varnika Girish from Dimension Intermational School, Singapore

Class : Class 2

Answer is D ‘cause that type of house is found in Assam ,Kashmir and in Uttar Pradesh

Ans 2:

Kashika Goel from DPS Noida, Noida

Class : Class 7

Ans 3:

Shruti from ,

Class : Class 1

uqhsuwhuwhsywbdwsw supergirl

Ans 4:

Saharsh Chaudhari from INS , Pune

Class : Class 4

d

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Aarush Goel from K.R. Mangalam World School, New Delhi

Subject :NSO Class : Class 10

If 'A $ B' means A is the brother of B; 'A @ B' means A is the wife of B; 'A # B' means A is the daughter of B and 'A * B' means A is the father of B, which of the following indicates that U is the father-in-law of P?

A P@Q$T#U*W
B P@W$Q*T#U
C P@Q$W*T#U
D P@Q$T#W*U

HOW WILL WE SOLVE THIS QUESTION

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Ans 1:

anurag kumar tiwary 1 3 from bwgs, Ranchi

Class : Class 10

P@Q$T#U*W

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Bipasana from KV IIT Kanpur, Kanpur

Subject :NSO Class : Class 9

Natural water is impure and needs to be purified before this water can be supplied to homes for drinking purposes. The sequence of steps involved in purification of water is

A Filtration, sedimentation, decantation and aeration
B Sedimentation, loading, filtration and chlorination
C Chlorination, aeration, sedimentation and filtration
D Chlorination, filtration and distillation.

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Ans 1:

Shubhadeep Santra from St Pauls Sr Secondary School, Jodhpur

Class : Class 10

option b is correct

Ans 2:

Shubhadeep Santra from St Pauls Sr Secondary School, Jodhpur

Class : Class 10

option b is correct

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Archit Santosh Darakh from Podar International School , Aurangabad

Subject :NSO Class : Class 6

There are 206 bones in the body of an adult. The biggest bone of our body is ________ which is located in the ________. The smallest bone is ________. It is located in the ________.
Select the correct sequence of words to complete the above paragraph.

ATibia, thigh, vertebra, inner ear
BFemur, thigh, stapes, middle ear
CFemur, shoulder, stapes, inner ear
DRadius, arm, malleus, inner ear

Biggest bone is femur it is found in thigh and smallest bone is stapes and found in middle ears

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Ans 1:

Kanak goel from Ursuline senior secondary convent school, Greater Noida

Class : Class 6

B

Ans 2:

Sahasra Suru from Rajagiri public school, Doha

Class : Class 7

B

Ans 3:

Soumita Pramanik from HALLYAN high School, Howrah

Class : Class 6

B

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Aryan Yadav from Divine Child School, Mehsana

Subject :NSO Class : Class 2

Which of these you should NOT do while eating?

AStuff your mouth
BChew with mouth closed
CChew food slowly
DAvoid talking

A

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Aashvi Ritesh from Billabong high, Bhopal

Subject :NSO Class : Class 3

Foods like chapati, rice and potato wedges are rich in __________.

A Carbohydrate
B Protein
C Vitamin
D Mineral

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Ans 1:

Pritisha priya from Global Indian International School, Abu Dhabi, Abu Dhabi

Class : Class 7

I got wrong in this.

Ans 2:

Akanksh Pramanik from ST. PAUL'S SCHOOL, RAMPURHAT

Class : Class 3

Me too , babe

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siddhesh srinivasan from psbb millenium, cuddalore

Subject :NSO Class : Class 10

An air conditioner is rated 260 V, 2.0 kW. The air conditioner is switched on for 10 hours each day. What is electrical energy consumed in 30 days?

A 20 kW h
B 2000 kW h
C 600 kW h
D 420 kW h

How is C the correct ans to this?

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Aryan Yadav from Divine Child School, Mehsana

Subject :NSO Class : Class 2

Vaishali fell asleep under a tree at time P and woke up at time Q (as shown).

She is wondering why she cannot see her shadow. Select the correct explanation for this.
1. At time ‘P’, the tree is blocking the light and preventing it from falling on her.
2. At time ‘Q’, her shadow falls at the back, so she cannot see her shadow.
3. She fell asleep in the morning and woke up in the evening.
4. She is reflecting back sunlight.

A 1 and 2 only
B 1 and 4 only
C 2 and 3 only
D 3 and 4 only

C

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