National Science Olympiad Forum By SOF Olympiad Trainer - Page 277
  1. Home
  2. /  Forum

User Forum

Ask Your Question
Mahadevan from KV Rubber Board Kottayam, Kottayam
Subject :NSO    Class : Class 5

Raju, a farmer got his field checked for soil toxicity. The report showed high level of toxic chemicals in his field. How can these toxic chemicals in the soil be harmful?

AThey may enter any nearby waterbody due to runoff and cause algal bloom.
BThey are absorbed by food plants growing in the soil making them unfit for consumption.
CThey may get evaporated in the air causing air pollution.
DBoth A and B


Answer is B not D

Ans 1:

Sai Arinesh from ,
Class : Class 5
but the answer you have said is both A and B? IT SHOWS ANSWER = D

Ans 2:

Sai Arinesh from ,
Class : Class 5
SORRY ABOUT THE MISUNDERSTANDING

Ans 3: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

D

If these toxic chemicals enter the nearby waterbodies, they cause the microalgae population in the water-body to grow uncontrollably, causing algal bloom. These algae lower the oxygen levels in the water and cause harm to aquatic life. Toxic chemicals mixed with soil and water are absorbed by food plants and they become unfit for consumption. Toxic chemicals in the soil will cause soil pollution and water pollution. They will not cause air pollution.

 


Post Your Answer

AARNA Kapse from The swaminarayan school, Nagpur
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

D

Reusing old cans, bottles and newspapers means you won’t be buying new ones from market. This will help to conserve natural resources that are used for making new cans, bottles and newspapers. So, this will help to control environmental pollution.


Post Your Answer

Pradhyumna K from SRI BHUVANENDRA RESIDENTIAL SCHOOL, Karkala
Subject :NSO    Class : Class 8

Ans 1:

ANUSHKA SHARMA from CAMBRIDGE COURT WORLD SCHOOL, JAIPUR
Class : Class 8
Testes which is the primary sex organ in male reproductive system, produces the male gamete sperm as well as male hormone Testosterone

Ans 2:

Pradhyumna K from SRI BHUVANENDRA RESIDENTIAL SCHOOL, Karkala
Class : Class 8
Testes

Post Your Answer

Riddhiman Bose from Don Bosco School, Kolkata
Subject :NSO    Class : Class 5

Ans 1:

Pratham Dave from GNS, Bangalore
Class : Class 7
D is the answer to this question

Ans 2:

Vihaan Patil from Bombay Scottish School, Mahim Mumbai
Class : Class 6
options given are wrong

Ans 3:

Biju Pappachan from Rkc , Raipur
Class : Class 1
I would have known the answer if there was a clearer pic

Ans 4:

Koustavi Chakraborty from DELHI PUBLIC SCHOOL, PUNE
Class : Class 5
correct answer isd

Ans 5:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore
Class : Class 9
How is Fig. (b) Adding fertilisers to field? https://www.sofolympiadtrainer.com/forum/user/467395 Pls. reply

Ans 6:

PRAGWANSH JENA from DELHI PUBLIC SCHOOL, Raipur
Class : Class 8
D

Ans 7:

Akshaj V from PSBB Senior Secondary School, Chennai
Class : Class 5
All your pictures are blurry and dull. Could you please try to make it colourful and visible? Thank you.

Ans 8: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

D

Ploughing the field(d)→Adding fertilisers to the field(b)→Sowing the seeds(e)→Irrigation of crops(a)→Spraying pesticides(c)


Post Your Answer

Aarav Srivastav from DWPS , Noida Extension
Subject :NSO    Class : Class 6

Ans 1:

Vasu tyagi from St Joseph's High school, Panvel
Class : Class 6
Answer is C .Because Vitamin D is formed in our body due to exposure to sunlight through colestrol so option A is right .deficiency of vitamin D and calcium causes rickets .calcium is present in milk but not sometimes in its products .so the correct answer is C

Post Your Answer

shawn pal from DPS Gandhinagar, AHMEDABAD
Subject :NSO    Class : Class 8

Ans 1:

ANUSHKA SHARMA from CAMBRIDGE COURT WORLD SCHOOL, JAIPUR
Class : Class 8
The answer is (b) According to Kepler's second law, the angular momentum of the planet is constant. The angular momentum of the planet does not vary, i.e. the aerial velocity of the planet remains constant.

Post Your Answer

Parth Gupta from Presidium Gurgaon, Gurgaon
Subject :NSO    Class : Class 6

Ans 1:

Vasu tyagi from St Joseph's High school, Panvel
Class : Class 6
answer is A .

Ans 2:

Maanasa from Billabong high, Chennai
Class : Class 6
the answer is D the server is right

Ans 3:

Soundarya pandey from SVM ,Vasai east, Vasai
Class : Class 7
the answer is d

Post Your Answer

Shreshta from Presidium, Ghaziabad
Subject :NSO    Class : Class 4

Ans 1:

Satvik Agrawal from Delhi Public School, bhopal
Class : Class 5
BBBBBBBBBBBBBBBBBBBBBBBBBBBBBB

Ans 2:

Bushra aslam from uttam, Ghaziabad
Class : Class 8
B

Ans 3:

Dishita Santosh Walujkar from Nutan English School, Kurduwadi
Class : Class 7
answer is B

Ans 4:

Bhavya Sheth from Bright Day School, Vadodara
Class : Class 6
14 X 7 = 98 not 56 see the solution then put answer on the forum .

Ans 5:

DC from biv, PUNE
Class : Class 5
b is the answer

Ans 6:

jathin from national public school chikkabanavara, banglore
Class : Class 4
the answer is : b 2,4,8,14,28

Ans 7:

Mohhika Sharma from Delhi Public School Greater Noida, Greater Noida
Class : Class 7
Isn't this an IMO question????????!!!!!!!!!!!!!!!!!!!!!!!

Post Your Answer

AARNA Kapse from The swaminarayan school, Nagpur
Subject :NSO    Class : Class 3

Ans 1: (Master Answer)

Admin from revisewise, Noida
Class : Class 1

C

Animals X and Y shown in the figure are of shark and rat respectively. Shark is a carnivore and rat is an omnivore. Similarly in option C clouded leopard is a carnivore and skunk is an omnivore. 


Post Your Answer

aritro bhaumik from lotus valley, Noida
Subject :NSO    Class : Class 7

Which of the following statements are correct?
(i) Time period of a simple pendulum is the time taken by the pendulum to complete one oscillation.
(ii) The area under the speed-time graph on time axis is the distance.
(iii) Heat is exchanged between two bodies if they have different amount of heat but have same temperature.
(iv) In an electrical circuit, short circuit occurs when a naked live wire and a neutral wire come in direct contact.
(v) When a light wave and a sound wave travel from air into water, their speeds are decreased.
a. (i), (ii) and (iv) only
b. (i), (ii) and (iii) only
c. (ii), (iii) and (iv) only
d. (iii), (iv) and (v) only
Given that average speed of the car is 60 km h–1.
What is the value of x?

A 120 km
B 180 km
C 240 km
D 720 km


the questions wrong, two questions are colliding

Ans 1:

Rishi from Deens Academy, BENGALURU
Class : Class 7
exactly!!!its bugged

Ans 2:

Palash sachin patel from Kips, Patan
Class : Class 8
correct options are not given

Ans 3:

Advik Tripathi from The Khaitan School, Noida
Class : Class 8
I tried doing it, nothing came out! Hell!!

Ans 4:

GAUTHAM GOPINATH from BPDAV School, HYDERABAD
Class : Class 10
How is the first part of the question related to the second part?

Ans 5:

Hritvi from Podar International School, Mumbai
Class : Class 7
There are 2 parts in this question which are not at all inter-related.The average speed (2nd part) question is the incomplete question of Q.10

Ans 6:

Prathamesh Raje from DPS Electronic City, Bangalore
Class : Class 9
NA

Ans 7:

Bhavtosh Tripathi from Maneckji Cooper Education Trust School, Mumbai
Class : Class 9
The question has a bug

Post Your Answer