National Science Olympiad Forum By SOF Olympiad Trainer

Aaditya Jain from Jaypee public school, Greater noida

Subject :NSO Class : Class 6

A few mixtures are listed in the box.
(i) Salt solution (ii) Oil and water (iii) Alcohol and water (iv) Soda water (v) Iron and sand (vi) Flour and husk (vii) Milk
Now, read the given passage and fill in the blanks by selecting an appropriate option. Mixtures (p) are homogeneous in nature while mixtures (q) are heterogeneous in nature. Mixture(s) (r) is/are separated into its/their components by centrifugation where (s) component collects towards the centre. Mixture (t) is separated into its components by distillation where the component having (u) boiling point gets collected in the receiver flask first.

	P	Q	R	S	T	U
A	i, ii, vi	iii, iv, v, vii	ii, v	Heavier	iii	Higher
B	ii, iv, vi	i, iii, v, vii	ii, iv	Lighter	vii	Lower
C	i, iii, iv	ii, v, vi, vii	vii	Lighter	iii	Lower
D	i, iii, vi	ii, iv, v, vii	iv, vii	Heavier	i	Higher

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Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Subject :NSO Class : Class 4

Based on nutrients, select the option in which the odd one is encircled correctly.

A Meat, , Fish
B , Butter, Oil
C Potato, , Bread
D Beetroot, , Red meat

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Ans 1:

Elisha Kannojia from Delhi Public School, Noida

Class : Class 5

Ans 2:

namrata maheshwari from euroschool, airoli

Class : Class 9

i am lipi sanwal from S.H.I.S , GURUGRAMat first I reported a error in the question but after wards I understood iiiiiiiiittttt !

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Shivangi singh from Dps greater Noida, Greater Noida

Subject :NSO Class : Class 3

Read the given statement regarding soil X and select the correct statement regarding it. Soil X is sticky, it can hold a lot of water and there is very little space for air between the particles.

AMost plants grow well in it.
BIt is used to make toys, flower pots, idols, etc.
CIt is a mixture of sand and clay.
DIt is mostly found on the seashore and in the desert.

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Ans 1:

from ,

Class :

C

Ans 2:

from ,

Class :

C

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student from school, city

Subject :NSO Class : Class 6

Sugar can be separated from its solution because

A Mixing of sugar in water is a permanent change
B Mixing of sugar in water is an exothermic process
C Mixing of sugar in water is a change that can be reversed by evaporation
D Mixing of sugar in water is a change that can be reversed by filtration.

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Ans 1:

Anusuya Rangasamy from EISB, Bengaluru

Class : Class 6

the correct option is 'C' BECAUSE SUGAR IS A SOLID SO WHEN THE LIQUID IS HEATED IT EVAPORATES LEAVING THE SUGAR BEHIND

Ans 2:

Pratheek from Null, Null

Class : Class 4

Option C

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student from school, city

Subject :NSO Class : Class 6

Observe the given figure carefully and select the correct statement.

AProcesses P and R are exothermic.
BProcesses S and R are exothermic.
CProcesses S and R are endothermic.
DProcesses P and Q are endothermic.

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Ans 1:

from ,

Class :

Ans 2:

Anoop Haridas from dpsmis doha, doha

Class : Class 8

C is the answer, as in each of these processes, the heat is absorbed.

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from ,

Subject :NSO Class : Class 5

Which body parts act as the fulcrums of levers?

A Muscles
B Bones
C Joints
D Tendons

g7ggygyg

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from ,

Class :

i think correct answer is C

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Ajay Singh from Kendriya Vidyalaya Khanapara, Guwahati

Subject :NSO Class : Class 3

Study the diagram shown below which shows X, Y and Z as three states of water. Which arrows, K, L, M or N, represent the processes of freezing and boiling?

	Freezing	Boiling
A	K	M
B	K	L
C	M	N
D	N	M

WHY THIS QUESTION ANSWERS C

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Ans 1:

SIDDHARTH SOMANI from Vibgyor High, Mumbai

Class : Class 5

Ans 2:

veda M from cresmonde world school, mumbai

Class : Class 4

Ans 3:

Vaishnavi Harish Iyer from Vikhe Patil Memorial School, Pune

Class : Class 8

Ans 4:

Shibani Pal from cghs, Kolkata

Class : Class 3

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from ,

Subject :NSO Class : Class 8

Earthquakes at two places A and B were measured by a seismograph which recorded the magnitude as 2 and 4. The magnitude of tremors and the destructive energy at A and B can be compared as

A Tremors at B are two times those at place A
B Tremors at B are four times those at place A
C Tremors at B are 100 times those at place A
D Tremors at B are 1000 times those at place A.

pls tell how to calculate

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Ans 1:

Divij Narang from ,

Class : Class 9

Ans 2:

from ,

Class :

C as the scale is 1:0.05

Ans 3:

Sainyam Sharma from Thakur Public School, Mumbai

Class : Class 8

1000

Ans 4:

Arnav Raj Sharma from Dpsvk, Gurgaon

Class : Class 9

Please refer to the Ncert Book, the answer option D is favoured there

Ans 5:

from Bhandari Public School, KHANDWA

Class : Class 9

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from ,

Subject :NSO Class : Class 8

The given table represents the properties and uses of a few plastics.

The plastics represented incorrectly are

A I and IV only
B I and III only
C II and III only
D I, III and V only.

Wrong answer ... How can bakelite be thermoplastic?

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Ans 1:

Sanjeev Kumar from Mount Litera Zee School, Jhansi

Class : Class 8

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from ,

Subject :NSO Class : Class 9

Kepler's third law states that square of period of revolution (T) of a planet around the sun is proportional to third power of average distance r between the sun and the planet i.e. T² = Kr³ (here K is constant). If the masses of sun and planet are M and m respectively then as per Newton's law of gravitation, force of attraction between them is F = GMm/r², here G is gravitational constant.
The relation between G and K is described as

A K = G
B K = 1/G
C GK = 4π²
D GMK = 4π²

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Ans 1:

from ,

Class :

Correct ans:D. The gravitational force is equal to the centripetal force acting between the Sun and Planet. GMm/r^2=Mv^2/r =>v^2=Gm/r. Also,T=2(pi)r/v. Squaring both the sides we will get

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