National Science Olympiad Forum By SOF Olympiad Trainer - Page 283
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Nandini Mahajan from Salwan Public School, Gurgaon
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B

The food-chain is starting with X. That means X is a plant (Producers). X is eaten by Y. So, Y must be a Herbivore (for example, animals like deer, rabbit, goat, etc.). And Y is eaten by Z. So, Z must be Carnivore (for example, animals like wolf, lion, hyena, etc.).


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Ankit kumar Jha from Ryan International School , Ghaziabad
Subject :NSO    Class : Class 8

Read the given paragraph and answer the following questions.
Two metal rulers of lengths 30 cm and 60 cm are kept in such a manner that a 30 cm ruler extends about 15 cm over the edge and a 60 cm ruler extends about 30 cm over the edge. Both the ends are flicked. Read the given statements and select the correct option.
Statement 1 : The note heard in the vibration of 30 cm ruler is louder when flicked with larger amplitude.
Statement 2 : Loudness of a sound depends on the amplitude of vibrations.

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 Statement 1 is false but statement 2 is true.


DOES NOT ANYONE THINK THAT THE ANSWER SHOULD BE D?????

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jeet from Indian School Sohar, Sohar, Oman, Sohar
Subject :NSO    Class : Class 8

Ans 1:

Venya from CHIREC International, Hyderabad
Class : Class 9

Ans 2:

sankalp from Gyan Bharti School, Saket, Delhi
Class : Class 9
MCPA is a weedicide, so it should not be A

Ans 3:

minhuna from ABCD, Hyderabad
Class : Class 8

Ans 4:

Pushkar Sonnekar from Ryan International School, Mumbai, Vasai East
Class : Class 8
But shouldn't it be option C, as 2 and 4 D are fertilizers.

Ans 5:

Rushil from Delhi Public School, Nashik
Class : Class 9
It should be option C because 2 4-D is a pesticide

Ans 6:

Ayush Behera from sunbeam engkish school, bhagwanpur, Varanasi
Class : Class 4
Simazine is pesticde! The answer must be A

Ans 7:

Ayush Behera from sunbeam engkish school, bhagwanpur, Varanasi
Class : Class 4

Ans 8:

Shaurya Veer from Blooming Dales International School, Sri Ganganagar
Class : Class 9
The answer should be c as that is the only one that has 2,4D as it's option also the SOF solution says the same but shows a different answer

Ans 9:

Ayush Chauhan from Modern Public School, Bhiwadi
Class : Class 9

Ans 10:

A Venkata Sai Pranav from Podar International School, Bhusawal
Class : Class 9
It should be C

Ans 11:

cherry from atomic energy central school-4, mumbai
Class : Class 9
shouldnt the answer be a? simazine is also a pesticide

Ans 12:

Soham from Vibgyor high, Pune
Class : Class 8

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Aryan from Ihs, Karama
Subject :NSO    Class : Class 9

Read the given statements and select the correct option.
Statement 1 : A man carrying a bucket of water and walking on a rough level road with a uniform velocity does no work while carrying the bucket.
Statement 2 : The work done on a body by a force (F) in giving it a displacement (S) is defined as W = . = FS cos , where is the angle between vectors and .

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.


Please give the solution

Ans 1:

Necro from New Tulip international school, Ahmedabad
Class : Class 10

Ans 2:

Necro from New Tulip international school, Ahmedabad
Class : Class 10
Isnt it A?

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Ankit kumar Jha from Ryan International School , Ghaziabad
Subject :NSO    Class : Class 8

The given figure represents the location of various endocrine glands in human body.

Identify the glands marked as P, Q, R, S and T and select the incorrect statement regarding these.

A Gland P secretes the hormone thyroxine, which regulates growth and metabolism.
B Gland Q secretes the hormones corticosteroids and adrenaline, which regulate breathing, heart rate, carbohydrate metabolism and mineral balance.
C Glands S and T secrete the hormones which control secondary sexual characters in females and males respectively.
D Gland R secretes the hormone insulin, whose increased concentration leads to diabetes.


i think b and d both are correct

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Agriye Kamboj from ST.XAVIER SEC SE CO ed Bhopal, BHOPAL
Subject :NSO    Class : Class 4

Ans 1:

Vihaan Nair from Ambassador School, DUBAI
Class : Class 6

Ans 2:

Yashraj Namdev Deshmukh from Sahyadri English School, Loha, Nanded
Class : Class 6
C)

Ans 3: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

 In the life cycle of butterflies etc., egg hatches to produce a young one called a larva which looks like a worm. After some days, it changes into pupa which finally turns into an adult.


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Ishan Chavan from National Public School Chikkabanavara, Bengaluru
Subject :NSO    Class : Class 3

Ans 1:

Anaahad Mehar Satsangi from Delhi Public School Agra, Agra
Class : Class 3
b

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B

Blood, Heart and Blood vessels are all parts of the Circulatory system. Similarly, Kidneys, Lungs and Skin are organs of Excretory system.


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Ishan Chavan from National Public School Chikkabanavara, Bengaluru
Subject :NSO    Class : Class 3

Ans 1:

om goyal from rainbow school, saharanpur
Class : Class 3

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B

Option A and C has correct statements and option B has incorrect statement. Bird Y can fly. It can be woodpecker, which has feet similar to parrot. Bird X can fly as well as swim. It cannot be the black and white coloured bird found at poles, as it cannot fly.Bird Z runs fast. It can be ostrich that lays largest egg in the world.

 


Ans 3:

Shubhra from DPS, Haridwar
Class : Class 4

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Dushyant Singh from Shri Ram Centennial School, Indore
Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C


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aadityaarmaan from KVS Chabua, Dibrugarh
Subject :NSO    Class : Class 7

Ans 1:

aadityaarmaan from KVS Chabua, Dibrugarh
Class : Class 3

Ans 2:

Ishaan Pal from Christ Academy, Bangalore
Class : Class 7
the graph is not clear

Ans 3:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
The answer is option B. We can see that the difference between w's height (3) and x's height (7) is the highest as compared to others. Therefore the moving ball gained maximum speed at X

Ans 4:

Gauri Singh from St Johns School Marhauli, Varanasi
Class : Class 8
Oh sorry! The reason is that at X, the ball traveled most distance in less time as compared to other.. That's the reason that the ball has greatest avg. speed at X

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