National Science Olympiad Forum By SOF Olympiad Trainer - Page 652

User Forum

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7
Here the properties of lines and angles will be applied.Then the laws of reflection

Ans 2:

Class : Class 7
Answer is (a). This is observed due to this reasonThere's a line which is making an angle 55° and is a linear pair. Hence the angle of line (mirror) p is 180°. But 55° is not the angle of incidence. To get the sum of angle of incidence and reflection, we multiply 55° by 2 and get 70°. Since angle of incidence =angle of reflection, 70°÷2=35°. The angle of incident ray and the reflected ray of P and Q are same thus the sum of the angle of incidence and angle of reflection would be the same (70°). We know, angle of incidence=angle of reflection, hence 70°÷2=35°. Or A=35°

Ans 3: (Master Answer)

Class : Class 1
The correct answer is C.

Ans 4:

Class : Class 9
I am not able to understand it

Ans 5:

Class : Class 9
I actually don't get the logic behind it

Ans 6:

Class : Class 7
The correct is C

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 10
the answer should be B because cocave lens is a diverging lens which will diverge the light to all parts of the room

Ans 2:

Class : Class 2
A

Ans 3:

Class : Class 8

Ans 4:

Class : Class 9

Ans 5:

Class : Class 9
yes ans c

Ans 6:

Class : Class 5
Ans c

Ans 7:

Class : Class 7
0hi hi hih h hi hi hi hii

Ans 8:

Class : Class 4
yes according to me also the answer is c but in nso practice papers it is written as d

Ans 9:

Class : Class 7
The answer is B

Ans 10:

Class : Class 7
The correct answer is D.

Ans 11:

Class : Class 8
ans= c

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 7
yes you are right

Ans 2:

Class : Class 4
D is correct

Ans 3:

Class : Class 8
D is correct

Ans 4:

Class : Class 4

Ans 5:

Class : Class 5
the answer is d

Ans 6:

Class : Class 8
I think B and D is correct.

Ans 7:

Class : Class 2

Ans 8:

Class : Class 4
NONE of these is the correct answer

Post Your Answer

Subject :NSO    Class : Class 3

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 10
Hcl doesnt react with glass. The explanation is wrong

Ans 2:

Class : Class 8
Inorganic acids such as minerals acid like HCL , H2SO4 etc . Are. Not always made in factories . HCL is produced in our stomach.

Ans 3:

Class : Class 8

Ans 4:

Class : Class 10
Hcl doesen't react with metals......Sulphuric acid does

Ans 5:

Class : Class 7
Q is wrong since option 1 is false, rest all are true

Ans 6:

Class : Class 5
You all are correct

Ans 7:

Class : Class 8
Hydrochloric acid reacts with metals and corrodes them and is therefore stored in glass bottles... This question is wrong and so is the explanation.

Ans 8:

Class : Class 6
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 9:

Class : Class 7
Yes, I also agree. HCl is a strong acid and reacts with metals almost exactly like H2S04, it is also stored in glass for this reason, question is wrong.

Ans 10:

Class : Class 9
Hydrocloric acid is very corrosive and reacts with metals . So HCL is stored in glass bottles because it dont causes damage to it . ..........SO 3 statement should be true and their explanation is wrong .

Ans 11:

Class : Class 10
Hcl reacts with metals also

Ans 12:

Class : Class 8
I completely agree... The HCl reacts with metals , which is major reason of why HCl is stored in glass bottles..

Ans 13:

Class : Class 7

Ans 14:

Class : Class 8
hcl reacts with metals too

Post Your Answer

Subject :NSO    Class : Class 7

Ans 1:

Class : Class 7

Ans 2:

Class : Class 7
i gave the correct answer but in the result they are showing that it is wrong.it is the same case with some other questions too.Please make a note that you correct it,thank you.

Post Your Answer

Subject :NSO    Class : Class 5

Ans 1:

Class : Class 7

Ans 2:

Class : Class 9

Ans 3:

Class : Class 5
Yes option d is correct

Ans 4:

Class : Class 6
according to Google stapler is a third-class lever

Ans 5:

Class : Class 7
The answer is D because the stapler is the odd one out

Ans 6:

Class : Class 6
What is type of Option A?

Ans 7:

Class : Class 3
D

Ans 8:

Class : Class 5

Ans 9:

Class : Class 6
option D is correct because stapler is 3rd class lever

Ans 10:

Class : Class 10

Ans 11:

Class : Class 7
Stapler ( option D ) is the odd one out as it is a third class lever i.e. effort is between the load and fulcrum .

Ans 12:

Class : Class 5
yes because the stapler is a third class lever

Post Your Answer

Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
I was thinking about body building food

Ans 2:

Class : Class 3

Post Your Answer

Subject :NSO    Class : Class 8

Ans 1:

Class : Class 8
A

Ans 2:

Class : Class 9
The correct answer is B because manure is soluble in water but it is absorbed very slowly

Ans 3:

Class : Class 10
it is A as fertilizers are soluble in water. You might have heard that fertilizers flow into the river and cause eutrophication it flows into river because it is soluble in water

Ans 4:

Class : Class 8
A

Ans 5:

Class : Class 8

Ans 6: (Master Answer)

Class : Class 1
The correct answer is A.

Post Your Answer

Subject :NSO    Class : Class 8

Post Your Answer