National Science Olympiad Forum By SOF Olympiad Trainer

User Forum

Subject :NSO    Class : Class 3

Ans 1:

Class : Class 3
Very easy question

Ans 2:

Class : Class 3

Ans 3:

Class : Class 3
easy

Ans 4:

Class : Class 3
answer is-B

Post Your Answer

Subject :NSO    Class : Class 5

Post Your Answer

Subject :NSO    Class : Class 9

Earthquakes generate sound waves inside the earth. Unlike a gas, the earth can experience both transverse S and longitudinal P sound waves. Typically the speed of S wave is about 4.0 km s-1, and that of P wave is 8.0 km s-1. A seismograph records P and S waves from an earthquake. The first P wave arrives 4 minutes before the first S wave. Assuming the waves travel in straight line, at what distance does the earthquake occur?

A 960 km
B 640 km
C 1920 km
D 2880 km


Post Your Answer

Subject :NSO    Class : Class 9

Read the given statements and mark the correct option.
Statement 1 : Bohr's orbits are called stationary orbits.
Statement 2 : Electrons remain stationary in these orbits for some time.

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.


Ans 1:

Class : Class 9

Post Your Answer

Subject :NSO    Class : Class 5

Post Your Answer

Subject :NSO    Class : Class 4

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
The answer is c

Ans 2:

Class : Class 2

Post Your Answer

Subject :NSO    Class : Class 7

Refer to the given figure of body cells and select the incorrect statements regarding X, Y and Z.

(i) Y maintains pH of blood.
(ii) Z is an important part of our immune system.
(iii) Z plays a key role in transporting gases in the blood.
(iv) The pigment present in X absorbs oxygen and transports it to the cells all over the body.

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


please explain

Ans 1:

Class : Class 8
in this case picture depict is wrong . WBC should be smaller than RBC in size .

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4
d

Ans 2:

Class : Class 5
answer d

Post Your Answer

Subject :NSO    Class : Class 10

A small conducting rod of length l, moves with a uniform velocity v in a uniform magnetic field B as shown in figure.


A The end X of the rod becomes positively charged.
B The end Y of the rod becomes positively charged.
C The entire rod is unerringly charged.
D The rod becomes hot due to joule heating.


By Fleming's right-hand rule, current flows from X to Y, but which end actually receives the extra positive charge?

Post Your Answer