Subject :NSO Class : Class 8
Subject :NSO Class : Class 7
Ans 2:
Class : Class 9
The byproduct of electric bulb is heat but the effect of heat in bulb is not something because of which the bulb glows.
Ans 8:
Class : Class 8
The correct answer is d) because everything else works on heating but what is the object in option d)
Ans 9:
Class : Class 10
I think it is a heater or a truck or car battery. It must be either of these two. Heater works on heating effect of electricity but battery does
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Subject :NSO Class : Class 1
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Subject :NSO Class : Class 3
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Subject :NSO Class : Class 3
Ans 6:
Class : Class 7
The correct ans. is 'b'... looks like these sof people aren't solving these themselves before asking these in the test. What is their reason for this choice¿
Ans 21:
Class : Class 6
The correct answer is B.I think SOF people aren't solving these themselves before asking this in the test. how can route A is possible. It is wrong .
Ans 23:
Class : Class 7
correct answer is B because in A there a to left turns so she can collide into house
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Subject :NSO Class : Class 1
(B) 
(D) 
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Subject :NSO Class : Class 7
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Subject :NSO Class : Class 7
Study the given Venn diagram carefully.
Identify 1, 2 and 3.
| 1 | 2 | 3 | |
| A | Do not React with metals | react with litmus | Do not react with carbonates |
| B | Are sour in taste | React with carbonates | Are soapy to touch |
| C | Have OH– > H+ | Have H+ OH– = H+ | Have OH– H+ > OH– |
| D | React with carbonates to form CO2 gas | can be identified by using indicators | turn china rose indicator green |
Ans 2:
Class : Class 8
Venn diagram shows proportion of acid and base to be equal for 3 i.e. salt then how can you say china rose indicator will turn green i.e. salt is basic in nature, i.e. 3rd part of option D which is correct as per admin. Please clarify..
Ans 14:
Class : Class 7
Actually venn diagram shows the propertied of the substances, not the substances themselves. So, it should be D. Admin is right.
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Subject :NSO Class : Class 1
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Subject :NSO Class : Class 7
When a person breathes out, what happens to the diaphragm and rib cage?
| Diaphragm | Rib cage | |
| A | Becomes flatten | Moves downwards and inwards |
| B | Becomes flatten | Moves outwards and upwards |
| C | Becomes more curved | Moves downwards and inwards |
| D | Becomes more curved | Moves outwards and upwards |
Ans 1:
Class : Class 6
C. This is because when we need to breathe in the ribcage moves up and outwards and diaphragm moves down. This movement increases the pressure outside as compared to inside and air rushes in. During exhalation the ribcage moves down and the diaphragm moves upwards. This increases the pressure inside the body as compared to the lower pressure outside and the air is pumped out of the body.
THE ASWER IS TECNICALLY (C) BUT THE QUESTION IS WRONG. IN THE NSO WORKBOOK THE QUESTION IS ASKED FOR THE MOVEMENT OF RIBCAGE AND DIAPRAGM WHEN WE BREATHE IN AIR. THIS IS A TECHINAL ERROR IN SOFOLYMPIAD TRAINER.