National Science Olympiad Forum By SOF Olympiad Trainer

Aryan Raju from Deens Academy, Bengaluru

Subject :NSO Class : Class 7

Read the given statements and select the correct answer.
Statement 1 : The distance x at which a car can be stopped by applying brakes depends on the initial velocity.
Statement 2 : Mass of the car has no role to play.

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 and statement 2 is false.
D Both statements 1 and 2 are false.

momentum plays a role and it involves mass.

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Ans 1:

Aditya kumar from Sapphire International School, Noida

Class : Class 8

Its "b" because mass has a role to play

Ans 2:

kaithabjeetsingh@gmail.com from the shri ram school aravali, Gurgaon

Class : Class 8

it can be d because both depend on the amount of retardation

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Subroto Bhowmik from Mothers International School, New Delhi

Subject :NSO Class : Class 8

Which of the following adaptations of camel are not meant for tolerating heat and water scarcity of deserts?
(i) Long legs and padded wide feet.
(ii) Brown body colour.
(iii) Long eyelashes.
(iv) Nostrils with flaps.

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

I gave the Answer A but the mock test gives the answer C ! but (iii) and (iv) are meant for surviving/tolerating heat

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Ans 1:

Anidroid ,Aniruddha from Modern DPS, Faridabad

Class : Class 8

iii & iv are adaptations to prevent dust & surviving sandstorms.I feel brown colour is to camouflage.

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Manas Richhawal from Podar international school, Nashik

Subject :NSO Class : Class 7

A metal rod is shaped into a ring with a small gap. If this is heated, which of the following will not occur?

(A) The length of the rod will increase.

(B) The gap will decrease.

(C) The gap will increase.

(D) The diameter of the ring will increase in the same ratio as the length of the rod.

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is C.

Ans 2:

Aditri S Madhavan from SBOAJC, Chennai

Class : Class 9

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from ,

Subject :NSO Class : Class 5

Look at the picture :

Which statement incorrectly describes the animal shown?
(i) It shows parental care.
(ii) It has hair on its body.
(iii) It is a bird
(iv) It reproduces by laying eggs.

A (i) and (ii)
B (iii) and (iv)
C (ii) and (iv)
D (i) and (iii)

Is bat a bird

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Ans 1:

Admin from Revisewise, Noida

Class : Class 3

A bat is a mammal hence shows parental care and has hair on its body.

Ans 2:

Arsh Abbas from Maharaja Aggarsain Adarsh Public School, New Delhi

Class : Class 6

B

Ans 3:

Shreyas Gupta from CHIREC International, Hyderabad

Class : Class 8

answer is b

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pinki kashyap from kids r kids, Chandigarh

Subject :NSO Class : Class 6

The given circuit diagram shows four bulbs in a circuit. Where should a switch be installed so that only one bulb can be switched on or off while the others remain lit all the time ?

(A) A

(B) B

(C) C

(D) D
explain it plz

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Ans 1:

Vasu tyagi from St Joseph's High school, Panvel

Class : Class 6

Answer is B,because if we keep switch ahead of bulb b so it will block electrons of B path so the electrons will pass through A,C,D and they will be lit all time .

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Bhagyesh Kamal from DPS, Mumbai

Subject :NSO Class : Class 5

Which two environmental changes usually cause certain animals to migrate?

Achange of season and fewer predators
Bchange of season and less food
Closs of habitat and fewer predators
Dloss of habitat and more food

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Ans 1:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Class : Class 7

The answer is option B.

Ans 2:

Koustavi Debnath from Asian international school , Howrah

Class : Class 6

Answer will be option-B

Ans 3:

Aarav Mandal from Notre dame academy Barh, Nalanda

Class : Class 5

Ans 4:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Class : Class 7

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ravi agarwal from sainik school , Bijapur

Subject :NSO Class : Class 8

Analyse the given data on the average rate of growth in height of boys and girls within different age groups. Select the correct interpretation(s) made on the basis of tabular data. Interpretations :

(i) Girls grow taller than boys.

(ii) Girls and boys have different set of hormones which control their growth.

(iii) Girls grow faster than boys.

(iv) Height of girls and boys depends on the genes inherited from their parents.

(A) (i) & (iii)

(B) (ii) & (iii)

(C) (iv) only

(D) (i), (iii) & (iv)

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Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

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Bharat Aggarwal from Kalyani school, Pune1

Subject :NSO Class : Class 5

Which of the following is correct?

AJaundice is not a communicable disease
BLeprosy is a non-contagious disease of skin
CCholera spread through the contaminated air
DTetanus can be occurred due to entry of germs through cut skin

how????

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Ans 1:

Varsha.K from DAV Public School - Velachery, Chennai

Class : Class 5

LEPROSY IS NON CONTAGIOUS

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Bharat Aggarwal from Kalyani school, Pune1

Subject :NSO Class : Class 5

Without friction there would be

Aless machine efficiency.
Bgreater output work than input work.
Cgreater input work than output work.
Dequal input and output work.

explain this

View All Answers (6)

Ans 1:

Shriya Sreekrishna from BLUEBELLS SCHOOL INTERNATIONAL, New Delhi

Class : Class 7

Ans 2:

Ali Hussain from Delhi Private School Dubai, Dubai

Class : Class 6

explain

Ans 3:

Bhabani Prasad from Narayan School, Kolkata

Class : Class 6

Ans 4:

Sanjeev Garg from Assumption Convent School, malout

Class : Class 6

Ans 5:

Gauri Singh from St Johns School Marhauli, Varanasi

Class : Class 8

Ans 6:

SHREYAS ANDOTRA from RYAN INTERNATIONAL SCHOOL, CHANDIGARH

Class : Class 8

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Hemant Ayuj from Shanti Asiatic, Ahmedabad

Subject :NSO Class : Class 6

Study the given flowchart and identify the processes P, Q, R and S involved in the separation of the mixture.

                    P                             Q                         R                S
A Sublimation     Magnetic separation     Filtration        Evaporation
BMagnetic          Filtration separation     Sublimation     Evaporation
CEvaporation     Magnetic separation     Filtration          Sublimation
DSublimation     Magnetic separation     Evaporation     Filtration

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