National Science Olympiad Forum By SOF Olympiad Trainer

Taksh from St John High School, Mumbai

Subject :NSO Class : Class 7

The rain becomes acidic because W, sulphur dioxide and X dissolve in rain drops to form Y, Z and nitric acid respectively. W turns lime water milky. Identify W, X, Y and Z respectively.

A Carbon monoxide, Nitrogen, Calcium hydroxide, Sulphur
B Carbon monoxide, Nitrogen oxide, Carbon dioxide, Sulphuric acid
C Carbon dioxide, Nitrogen dioxide, Carbonic acid, Sulphuric acid
D Carbon dioxide, Nitrogen oxide, Calcium hydroxide, Sulphur.

Anything

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Ans 1:

Taksh from St John High School, Mumbai

Class : Class 8

Ans 2:

Taksh from St John High School, Mumbai

Class : Class 8

Anything

Ans 3:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM

Class : Class 10

C

Ans 4:

Taksh from St John High School, Mumbai

Class : Class 8

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Taksh from St John High School, Mumbai

Subject :NSO Class : Class 7

Kriti performed the following two experiments.
I. She held a hack-saw blade with a pair of tongs and then kept the tip of the free end on the flame. She observed that the blade became red hot.
II. She dropped a shaving blade into the blue coloured copper sulphate solution. The colour of the solution changed to green.
Identify the types of changes occurring in both the experiments.

A I - Physical change, II - Chemical change
B I - Chemical change, II - Physical change
C Both I and II - Physical changes
D Both I and II - Chemical changes

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S KESHAV KUMAR from ST MARYS ICSE SCHOOL, NAVIMUMBAI

Subject :NSO Class : Class 5

Most of Earth's weather events take place in the

A Thermosphere
B Stratosphere
C Mesosphere
D Troposphere.

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Ans 1:

Bitan Chakraborty from Adamas international school, Kolkata

Class : Class 10

troposphere

Ans 2:

bh from Asdfgh, Hyderabad

Class : Class 9

D

Ans 3:

Avani from NPS International singapore, singapore

Class : Class 6

Troposphere is the correct answer

Ans 4:

Avani from NPS International singapore, singapore

Class : Class 6

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SWAPAN KUMAR GHOSH from navy children school, karwar

Subject :NSO Class : Class 6

Refer to the given Venn diagram and select the correct option regarding P, Q, R and S.

	P	Q	R	S
A	Bryophyllum	Mimosa	Sunflower	Morning glory
B	Ivy	Mustard	Marigold	Wheat
C	Canna	Smilax	Calophyllum	Ficus
D	Flax	Maize	Sorghum	Tomato

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Ans 1:

Pranav Kartik from DPS sushant lok , Gurgaon

Class : Class 3

Ans 2:

Harshvi Udani from Sawatridevi Agrawal school, Mumbai

Class : Class 6

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SWAPAN KUMAR GHOSH from navy children school, karwar

Subject :NSO Class : Class 6

Refer to the given Venn diagram and identify animals P, Q and R.

	P	Q	R
A	Viper	Cassowary	Centipede
B	Orangutan	Krait	Prawn
C	Anaconda	Ladybird	Earthworm
D	Hamster	Locust	Black mamba

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SWAPAN KUMAR GHOSH from navy children school, karwar

Subject :NSO Class : Class 6

Read the given statements and select the correct option.
Statement 1 : Our tongue feels cold when we place some glucose on it.
Statement 2 : Dissolution of glucose is an exothermic process.

A Both statements 1 and 2 are true and statement 2 is the correct explanation of statement 1.
B Both statements 1 and 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 Both statements 1 and 2 are false.

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Ans 1:

Adityashankar S Menon from St Stephens School Chandigarh, Chandigarh

Class : Class 5

Ans 2:

Amrik Pal from Kendriya Vidyalaya DRDO, Bangalore

Class : Class 6

it is B

Ans 3:

Shreyasi Padihary from The Cambridge International School , Bangalore

Class : Class 7

CCC

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Parthpratim Das from DPS School, Udaipur

Subject :NSO Class : Class 9

Find the odd one out.

A 18 : 108
B 42 : 132
C 22 : 112
D 26 : 156

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Ans 1:

Parthpratim Das from DPS School, Udaipur

Class : Class 7

pls give answer

Ans 2:

Aarushi Thapa from apeejay school noida, NOIDA

Class : Class 9

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Shinde Atharv from Sharda English School, Kaij

Subject :NSO Class : Class 6

(i) If material P is removed, Daksh will be able to see Poonam through material R.

(ii) If material R is removed, Poonam will not be able to see Daksh through material P.

(iii) If material S is removed, Ram is able to see blurred image of Daksh through material Q.

(iv) If material Q is removed, Daksh is not able to see Ram.

Recognise the nature of the materials P, Q, R and S.

(A) P : Transparent Q : Translucent R : Opaque S : Transparent

(B) P : Translucent Q : Opaque R : Transparent S : Translucent

(C) P : Opaque Q : Translucent R : Transparent S : Opaque

(D) P : Transparent Q : Opaque R : Translucent S : Opaque
Stupid questions

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Shinde Atharv from Sharda English School, Kaij

Subject :NSO Class : Class 6

Arrange the given words in a meaningful sequence and then choose the most appropriate sequence from the options.

1. College

2. Child

3. Salary

4. School

5. Employment

(A) 1, 2, 4, 3, 5

(B) 2, 4, 1, 5, 3

(C) 4, 1, 3, 5, 2

(D) 5, 3, 2, 1, 4
Stupid questions

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Ainesh das from Chrysalis, Bangalore

Subject :NSO Class : Class 4

Refer to the given diagram of human tooth and select the correct option regarding its parts P, Q, R and S.

AP is the soft, white and shiny part of tooth.
BQ is root whereas R is crown of tooth.
CS nourishes Q as it contains blood vessels and nerves.
DQ is a soft tissue which anchors the tooth inside gums.

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Ans 1:

Ibrahim Aslam from uttam, Ghaziabad

Class : Class 5

Correct

Ans 2:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi

Class : Class 7

C

Ans 3:

Overtaker from Blore, Blore

Class : Class 4

C

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