National Science Olympiad Forum By SOF Olympiad Trainer - Page 268

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Subject :NSO    Class : Class 6

Sudha took lemon juice in two flasks. She put salt in flask I and washing soda in flask II. She observed lots of bubbles in flask II but nothing in flask I. What could be the reason for this?


A In flask I, a chemical change takes place.
B In flask II, a chemical change takes place and bubbles of carbon dioxide are seen.
C In flask II, a physical change takes place producing lots of bubbles.
D In flask I, salt reacts with lemon juice and forms a new compound.


IF IT BUBBLES ARE BEING PRODUCED THEN WHY IS IT SURE THAT IT IS IRREVERSIBLE AND HOW DO WE KNOW THAT THE BUBBLES ARE OF Co2

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Class : Class 6

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Subject :NSO    Class : Class 6

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Class : Class 8
Ashoka Tree also has compound leaves.

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Class : Class 7

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Subject :NSO    Class : Class 5

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Class : Class 5
too easy

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Class : Class 4
Me too

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Class : Class 5
yes

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Class : Class 5
me too!

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Class : Class 7
I got great grades.

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Class : Class 9
me to

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Class : Class 8
Biju Pappachan , I completed the test with full marks

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Class : Class 8
It is confusing to me.....

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Class : Class 1
Anyone completed with full marks???

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Class : Class 7
Me too!

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Subject :NSO    Class : Class 5

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Class : Class 5
I had done B. Wrong answer selected

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Class : Class 4
b is the answer

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Class : Class 7
I am sad with this yghzgsdz comment everyone is giving, this is a website. Sometimes IT CAN GO WRONG AND Satvik Agarwal pls put your complain in report an error. shuit down

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Class : Class 7
Same - C got selected , I choose B

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Class : Class 5
b

Ans 6:

Class : Class 5
Answer is D i got it wrong to

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 5
Since Carbon dioxide is a greenhouse gas and causes global warming, the correct ans. will be C.

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Class : Class 5

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Class : Class 5

Ans 4:

Class : Class 7
C is the answer to this question

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Class : Class 5

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Class : Class 8
c is correct answer to this ques!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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Class : Class 6

Ans 8:

Class : Class 5
SINCE CARBON DIOXIDE CAUSES GLOBAL WARMING , THE CORRECT ANSWER IS OPTION C.

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 4

Ans 2:

Class : Class 4
the correct answer is D

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Class : Class 5

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Class : Class 5

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Class : Class 9

Ans 6:

Class : Class 5
bbbbbbbbbbbbbbbbbbbbbbbbbbb

Ans 7:

Class : Class 5

Ans 8:

Class : Class 4
the correct option is no.d

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Subject :NSO    Class : Class 5

Ans 1: (Master Answer)

Class : Class 1

A


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Class : Class 3
The alphabetical arrangement of given words is Burger, Bultcher ,butler,Butter, Butterfly So, the middle word is Butler .

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Subject :NSO    Class : Class 10

The diagram shows a model of a nephron and its associated blood vessels.
image
This model has been criticised for being a poor representation of a nephron. Which of the following statements explain(s) this?
1. The rubber tubing at B is not split up into numerous branches like the capillary network of the glomerulus.
2. The rubber tubing at B should be continuous and not contain small pores.
3. The stem of the thistle funnel (E) is not coiled to represent the convoluted tubules of the nephron.

A 1 only
B 1 and 3 only
C 2 and 3 only
D 1, 2 and 3


I am not able to understand this question......it Is really confusing.

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Subject :NSO    Class : Class 8

Refer to the given figure and select the incorrect statement(s).

(i) The part labelled P is found in plant cell only.
(ii) The part labelled Q is cell wall, which provides rigidity to a plant cell.
(iii) The part labelled R is the controlling centre.
(iv) The part labelled R gets its shape from part labelled P.

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


vacuoles are also present in animal cells in small size can youexplain your answer

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Class : Class 8

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Class : Class 8
What are the names of the parts labelled as P, Q, R,

Ans 3:

Class : Class 8
Image unclearSolution not givenWhat's going on, SOF?Please PLEASE RECTIFY THIS!

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Subject :NSO    Class : Class 8

Fill in the blanks with the most appropriate option.
W’ is very reactive metal, reacts vigorously with oxygen and water therefore, stored in (1).
X’ is non-metal, soft and dull and forms (2)oxides with oxygen.
Y’ is very reactive (3), catches fire if exposed to air, therefore, stored in water.
Z’ does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. When it is exposed to moist air for long, it acquires a dull (4)coating.

A 1-Water, 2-basic, 3-metal, 4-reddish brown
B 1-Kerosene, 2-acidic, 3-metal, 4-reddish brown
C 1-Kerosene, 2-acidic, 3-non-metal, 4-green
D 1-Water, 2-basic, 3-non-metal, 4-green


my answer is b can you explain me how it is c

Ans 1:

Class : Class 8
Hey Vartika. So here the metal they are talking about isnt potassium, but it is phosphorous. Potassium cannot be stored in water because it reacts with that too. So, here, the metal which they are talking about is phosphorous, which is a non-metal.Thanks! Hope that cleared your doubt :) 😊

Ans 2:

Class : Class 9
I don't understand.. potassium is very reactive in air and is thus stored in water.. and potassium is a metal hence correct answer should be b.. how is it c?... if anyone reads this pls reply here.. thanks

Ans 3:

Class : Class 9

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