National Science Olympiad Forum By SOF Olympiad Trainer - Page 278
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prithika from Indian school sohar, sohar
Subject :NSO    Class : Class 5

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Arsh Gupta from Cambridge International School, Jalandhar
Subject :NSO    Class : Class 6

A few changes are given as follows:
(i) Spinning of top
(ii) Occurrence of day and night
(iii) Formation of curd from milk
(iv) Curdling of milk by adding lemon juice
(v) Digestion of food
(vi) Burning of paper
Which of the following represents the correct classification of these changes?

A(i), (iv) and (vi) are physical irreversible changes while (ii), (iii), (iv) and (v) are chemical changes.
B(i), (iv) and (vi) are fast changes while (ii), (iii) and (v) are slow changes.
C(ii), (iv), (v) and (vi) are desirable changes while (i) and (iii) are undesirable changes.
DNone of these


Ans 1:

Ajay from Omega, Chennai
Class : Class 6

Ans 2:

Shweta Garg from Vibgyor high, Vadodara
Class : Class 8

Ans 3:

Antash from Podar , Kalyan
Class : Class 3

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Subham Mishra from WwA cossipore English school, kolkata
Subject :NSO    Class : Class 3

Ans 1:

Subham Mishra from WwA cossipore English school, kolkata
Class : Class 3
What is the meaning of S here. please clarify. S is something which is natural i believe.

Ans 2:

ADVAY BANSAL from LOTUS VALLEY INTERNATIONAL SCHOOL GURUGRAM, GURUGRAM
Class : Class 6
that was easy

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Bhavya Sheth from Bright Day School, Vadodara
Subject :NSO    Class : Class 4

Ans 1:

Rishon Chandy from KV IIT Powai, Mumbai
Class : Class 7

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

Air contains approximately 78% nitrogen, 21% oxygen, 0.9% argon, 0.04% carbon dioxide, and small amounts of other gases.


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Anushka Srivastava from Cjm, Dehradun
Subject :NSO    Class : Class 7

Which of the following statements is/are correct?
I. The excretory system in humans consist of a pair of kidneys, ureter, urinary bladder, a pair of urethras and urinary opening.
II. In lower animals such as Hydra waste product is excreted by the process of diffusion through the body surface.
III. The urine passes from the kidneys through urethra into urinary bladder.
IV. Urine consists of water, urea and other waste products and urea is breakdown product of proteins.

AI and IV
BII and IV
CII and III
DI and III


i even do think that the 1st option is correct

Ans 1:

Anushka Srivastava from Cjm, Dehradun
Class : Class 7
9jh

Ans 2:

AISHA from K.V.No.-1,A.F.S.,SEC.-14, GURUGRAM
Class : Class 10
B

Ans 3:

Arjun from Sri Kumaran Public School - ICSE, Bengaluru
Class : Class 7
This is wrong. Hydra is a Cnidarian, therefore the waste exits through its mouth.

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Amol Athawale from WoodRidge High, aurangabad
Subject :NSO    Class : Class 8

The different steps of agricultural practices are given below randomly.

(i) Irrigation (ii) Ploughing
(iii) Weeding (iv) Levelling
(v) Harvesting (vi) Fertilisers
(vii) Sowing (viii) Crop protection
(ix) Storing seeds  

Which of the following represents the correct sequence of these practices?

A (ii) – (iv) – (vii) – (i) – (vi) – (iii) – (viii) – (v) – (ix)
B (iv) – (ii) – (vii) – (i) – (vi) – (iii) – (viii) – (v) – (ix)
C (ii) – (vii) – (iv) – (iii) – (i) – (v) – (vi) – (viii) – (ix)
D (iv) – (vii) – (i) – (ii) – (iii) – (viii) – (ix) – (v) – (vi)


i think correct answer is B not A because levelling is done before ploughing.

Ans 1:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 6

Ans 2:

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

Ans 3:

Amol Athawale from WoodRidge High, aurangabad
Class : Class 6

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PARTH MEHTA from Navrachana school, Vadodara
Subject :NSO    Class : Class 4

Read the given paragraph with few blanks and select the option that correctly fills up any three of these blanks.
Human adults have P types of teeth in their dentition. These are Q , R , S and molars. Q helps in cutting or biting food. There are T Q in each jaw. R teeth are absent in milk teeth set but there are U such teeth in permanent teeth set. S are four in number and helps in V food.

A P-8, R-Premolars, V-Grinding
B Q-Incisors, T-4, U-8
C S-Canines, T-8, U-4
D P-8, S-Premolars, V-Tearing

Ans 1:

Bushra aslam from uttam, Ghaziabad
Class : Class 8
NA

Ans 2: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B

Human adults have 4(P) types of teeth in their dentition. These are Incisors(Q), Premolars(R), Canines(S) and molars. Incisors(Q) helps in cutting or biting food. There are 4(T) Incisors(Q) in each jaw. Premolars(R) teeth are absent in milk teeth set but there are 8(U) such teeth in permanent teeth set. Canines(S) are four in number and helps in Tearing(V) food.


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PARTH MEHTA from Navrachana school, Vadodara
Subject :NSO    Class : Class 4

Ans 1:

PARTH MEHTA from Navrachana school, Vadodara
Class : Class 6
Answer shud be d

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PARTH MEHTA from Navrachana school, Vadodara
Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

B


Ans 2:

suhana priyadarsini nayak from VELS GLOBAL SCHOOL, Bengaluru
Class : Class 5
Answer b will be the correct answer as mosquito is not a social insect while others are termite is not useful insect and honey bee is a useful insect

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ISHAN DAS from DELHI PUBLIC SCHOOL , ANGUL
Subject :NSO    Class : Class 4

Ans 1:

jathin from national public school chikkabanavara, banglore
Class : Class 4
THE ANSWER C

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