National Science Olympiad Forum By SOF Olympiad Trainer

Chaitanya Gawade from JPS, Pune

Subject :NSO Class : Class 9

The outer shell electrons in compound PQ₃ are shown in the given figure.

Which of the following could be the correct representation of elements P and Q?

	P	Q	No. of neutrons in P and Q	Valency of P and Q
A	Cl	N	7 and 15	3 and 3
B	N	Cl	5 and 17	5 and 3
C	P	Cl	16 and 18	3 and 1
D	O	F	8 and 9	2 and 1

How to solve this

Post Your Answer

Ajoy Bhuyan from DELHI PUBLIC SCHOOL, Bongaigaon

Subject :NSO Class : Class 4

Which part of the Earth is the coolest?

A Core
B Crust
C Mantle
D All of these

Ans 1:

Ajoy Bhuyan from DELHI PUBLIC SCHOOL, Bongaigaon

Class : Class 4

b ans

Ans 2:

Kushagra Chaturvedi from Podar International School Chinchwad, Pune

Class : Class 7

Ans 3:

Kushagra Chaturvedi from Podar International School Chinchwad, Pune

Class : Class 7

Thus ans is c not BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB

Ans 4:

Kushagra Chaturvedi from Podar International School Chinchwad, Pune

Class : Class 7

Thus ans is c not BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB

Ans 5:

Ajoy Bhuyan from DELHI PUBLIC SCHOOL, Bongaigaon

Class : Class 4

Ans 6:

Kushagra Chaturvedi from Podar International School Chinchwad, Pune

Class : Class 7

THIS IS NOT POSSIBLE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Because you can GOOGLE IT.......................................... MY OPINION- Kushagra Chaturvedi

Submit Your Answers

Post Your Answer

Chaitanya Gawade from JPS, Pune

Subject :NSO Class : Class 9

Three blocks A, B and C, of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a frictionless surface, as shown in the figure. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is

A 8 N
B 4 N
C 2 N
D 6 N

How to solvePls help

View All Answers (0)

Submit Your Answers

Post Your Answer

Chaitanya Gawade from JPS, Pune

Subject :NSO Class : Class 9

Mass spectrum of an element Q having two isotopes Q₁ and Q₂ is shown in the given graph.

If Q₂ is 8.082 times heavier than ¹²C and Q₁ is 7.833 times heavier than ¹²C then, the molecular mass of compound, QO₁ will be approximately
(Given : Atomic mass of O = 16 u)

A 94 u
B 128 u
C 96 u
D 125 u.

How to solve

View All Answers (0)

Submit Your Answers

Post Your Answer

Chaitanya Gawade from JPS, Pune

Subject :NSO Class : Class 9

Two point objects A and B having masses in the ratio 4 : 3 are separated by a distance of 1 m. When another point object C of mass M is placed in between A and B, the force between A and C is (1/3)^rd of the force between B and C. Then, the distance of C from A is

A
B
C
D

How to solve

View All Answers (0)

Submit Your Answers

Post Your Answer

ISHANI RAJE from NALANDA PUBLIC SCHOOL, Mumbai

Subject :NSO Class : Class 7

Gloria is holding her hand quite close to the side of a candle flame without feeling hot. This is because

AAir is a gas and is a poor conductor of heat.
BAir is highly inflammable
CCandle flame does not produce heat.
DNone of these

ok

View All Answers (4)

Ans 1:

Nivedita Tadepalli from Birla Open Minds International School-Bandlaguda Jagir, Hyderabad

Class : Class 7

how is answer a? I don't understand

Ans 2:

Bhagyesh Kamal from DPS, Mumbai

Class : Class 8

Ans 3:

Daksh Thakkar from VIBGYOR, Mumbai

Class : Class 8

ans is a

Ans 4:

Nivedita Tadepalli from Birla Open Minds International School-Bandlaguda Jagir, Hyderabad

Class : Class 7

Submit Your Answers

Post Your Answer

medhamshu8 from sri chaitanya, hyderabad

Subject :NSO Class : Class 7

what is the potential energy of an object if the mass of the object is 5kg and it is placed at a height of 10m above sea level (g=9.8m/s)(hint=P.E=mgh) A: 500J B: 100J C: 490J D: 750J

View All Answers (0)

Submit Your Answers

Post Your Answer

Chanpartap from The British Co Ed High School , Patiala

Subject :NSO Class : Class 7

The given graph shows the effect of pH on the activity of four different enzymes (P, Q, R and S). Which of the following correctly identifies enzyme found in the stomach, small intestine and one not affected by pH?

	Stomach	Small intestine	Unaffected by pH
A	R	S	Q
B	S	P	R
C	P	R	Q
D	Q	S	P

View All Answers (0)

Submit Your Answers

Post Your Answer

Rishita Verma from Suncity School, Gurgaon

Subject :NSO Class : Class 5

There is a definite relationship between figures (i) and (ii). Establish the same relationship between figures (iii) and (iv) by selecting a figure from the options which will replace the (?) in figure (iv).

A
B
C
D

View All Answers (2)

Ans 1:

Siddhant Singhania from AGCS purulia, Puruliya

Class : Class 7

Ans 2:

from , rajahmundry

Class : Class 2

ans C

Submit Your Answers

Post Your Answer

Roopa Penmetsa from Roopa Penmetsa, Hyderabad

Subject :NSO Class : Class 4

The name of which of the following CANNOT be obtained by using the letters given in the box? (You can use each letter more than once.)

A It is formed by condensation of atmospheric water vapour on cold exposed surfaces like leaves of plants.
B It is formed when atmospheric water vapour condenses and freezes on a surface which cools past dew point.
C It is a form of precipitation occurring in plains and leading to floods at times.
D It forms when thunderstorm updrafts are strong enough to carry water droplets above the freezing level causing them to freeze.

View All Answers (1)

Ans 1:

Anishka Banerjee from Euroschool, Thane

Class : Class 5

c

User Forum

Ans 1:

Ans 2:

Ans 3:

Ans 4:

Ans 5:

Ans 6:

Ans 1:

Ans 2:

Ans 3:

Ans 4:

Ans 1:

Ans 2:

Ans 1:

Related Links