National Science Olympiad Forum By SOF Olympiad Trainer - Page 566

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 6
C

Ans 2: (Master Answer)

Class : Class 1
The correct answer is C.

Ans 3:

Class : Class 5
THE CORRECT ANSWER IS C OPTION

Ans 4:

Class : Class 7
THE CORRECT ANSWER IS C

Ans 5:

Class : Class 4

Ans 6:

Class : Class 3

Ans 7:

Class : Class 3

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Subject :NSO    Class : Class 5

Ans 1:

Class : Class 6
Ans is A because lungs send oxygen-rich blood to the heart and this oxygen-rich blood is sended to all body parts and the carbondioxide-rich blood goes back to the heart from the body this carbondioxide-rich blood is sended to the lungs.

Ans 2:

Class : Class 8

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Subject :NSO    Class : Class 7

Read the given passage.
In a flower, produces pollen grains. Pollen grains are deposited on of pistil. carries male gametes to the ovule. Fusion of male and female gametes is called. After fertilisation, develops into fruit and develops into seed. Select the correct option which fills the blanks with atleast three correct answers.

A2-Style, 4-Fertilisation, 5-Ovary
B1-Anther, 3-Pollen tube, 6-Ovule
C2-Stigma, 3-Filament, 5-Ovary
D1-Anther, 2-Stigma, 4-Pollination


will anyone tell me where is the 4th blank? and what is wrong in option a

Ans 1:

Class : Class 9
4 th blank will be filled with fertilisation correct ans is b Pollen grains are deposited on stigma and not style

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Subject :NSO    Class : Class 4

Ans 1: (Master Answer)

Class : Class 1
The correct answer is D.

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Subject :NSO    Class : Class 3

Read the given statements and select the correct option regarding the subject of discussion.
Sanjay : Railways involve high construction and maintenance cost.
Kunal : A few states of India lack a good railway network.
Amit : The construction of railways is very difficult and costly in flat land whereas it can easily be done in mountainous region.
Rajeev : Areas with less industrial development cannot compensate the cost of construction of railways , hence have less railway network.

A Only Sanjay and Amit are correct.
B Amit and Rajeev gave the reasons of Kunal’s statement.
C Sanjay and Rajeev gave the reasons of Kunal’s statement.
D Amit gave the explanation of Sanjay’s statement.


I like this question 👍

Ans 1:

Class : Class 3
It should be D

Ans 2:

Class : Class 3
c is the correct answer

Ans 3:

Class : Class 5
abcd are correct

Ans 4:

Class : Class 8

Ans 5:

Class : Class 9
C

Ans 6:

Class : Class 3

Ans 7:

Class : Class 4
c maybe????

Ans 8:

Class : Class 7
kunal is wrong

Ans 9:

Class : Class 3
NA

Ans 10:

Class : Class 3
D

Ans 11:

Class : Class 7

Ans 12:

Class : Class 3

Ans 13:

Class : Class 7

Ans 14:

Class : Class 4
c is the ans

Ans 15:

Class : Class 1
D HE GAVE EXPLANATION

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Subject :NSO    Class : Class 3

Ans 1:

Class : Class 9
D

Ans 2:

Class : Class 5

Ans 3:

Class : Class 6
A is not correct D is correct

Ans 4:

Class : Class 1
d and Gaurika actually chocolate contains fats

Ans 5:

Class : Class 6
D is correct

Ans 6:

Class : Class 9
A

Ans 7:

Class : Class 6
D

Ans 8:

Class : Class 3
all of these

Ans 9:

Class : Class 5
Everyone thinks that a option is correct but it is wrong.The correct answer is d part.Everyone will think that chocolate is junk food.How can it give us the energy but chocolate contains fat.That's why when when we are hungry it gives us a lot of energy

Ans 10:

Class : Class 6
All of these

Ans 11:

Class : Class 8
all of these option(D)

Ans 12:

Class : Class 2
Fruits (2) contain minerals and vitamins and are protective food. They help in recovering from illness. Overeating of fried food (1) leads to obesity as it contains fat that gets stored in the body. Chocolates (3) contain a lot of carbohydrates which give us energy when hungry.

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Subject :NSO    Class : Class 7

Read the given data and select the correct option for the following questions.
Raman carried out an experiment to find out how fast water can pass through four different types of soil. He put each type of soil in four pots with equal sized holes at the base and placed separate dishes at their bottom to collect water. He poured water in them one by one, and used a stopwatch to record the time taken for water to reach the level he had marked same in each dish. His recording is given in the table as shown below.


What factors should Raman keep the same to ensure a fair test?
(i) The amount of soil
(ii) The size of the pot
(iii) The shape of the dish
(iv) The amount of water

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


How can it be a fair test if the amount of water varies

Ans 1:

Class : Class 10
The amount of water also matters right

Ans 2:

Class : Class 8

Ans 3:

Class : Class 7
I feel that it is D

Ans 4:

Class : Class 9
I think D is the correct answer

Ans 5:

Class : Class 4
Water is also correct

Ans 6:

Class : Class 8
shape of dish also should be included. Amount of water poured doesnt matter as long as you are collecting equal volume in all dishes. Hence similar dishes is important.

Ans 7:

Class : Class 7

Ans 8:

Class : Class 10

Ans 9:

Class : Class 7
c should be the correct answer

Ans 10:

Class : Class 8

Ans 11:

Class : Class 8
Definitely D

Ans 12:

Class : Class 6

Ans 13:

Class : Class 9
D

Ans 14:

Class : Class 7
All the given factors are required for a fair test ; So option D would be the correct answer

Ans 15:

Class : Class 9
I do agree it's D

Ans 16:

Class : Class 7
i think amount of water also nedd

Ans 17:

Class : Class 8
D

Ans 18:

Class : Class 5

Ans 19:

Class : Class 7
D, amount of water matters the most out of all.

Ans 20:

Class : Class 8
d is correct answer

Ans 21:

Class : Class 8
Option D is the correct answer

Ans 22:

Class : Class 8

Ans 23:

Class : Class 8
d

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Subject :NSO    Class : Class 6

A potter shapes pots out of clay (Process 1). He then bakes the pots in an oven (Process 2). Which of the following statements is correct?

A Process 1 is a reversible, physical change while process 2 is an irreversible, physical change.
B Process 1 is an irreversible, physical change while process 2 is an irreversible, chemical change.
C Process 1 is a reversible, physical change while process 2 is an irreversible, chemical change.
D None of these.


Is it A or C?

Ans 1:

Class : Class 6
Yes ,Because chemical means change in the properties but there is no change .The answer is A

Ans 2:

Class : Class 6
C because we can get clay back from a wet pot by smashing it,but once it heats up, it dries the clay and makes it stone hard.

Ans 3:

Class : Class 6
It should be A

Ans 4:

Class : Class 6

Ans 5:

Class : Class 4

Ans 6:

Class : Class 9
C,because- it is a chemical change. after baking we can break it into smaller particles but it won't form the same clay, with same properties again

Ans 7:

Class : Class 6
A is the correct answer

Ans 8:

Class : Class 6
on heating, the clay pot doesn't turn into stone,right?it doesn't change composition once heated , it is still clay ! answer is "A"

Ans 9:

Class : Class 6
It really should be A

Ans 10:

Class : Class 7
a is the correct answer because chemical composition dose not change

Ans 11:

Class : Class 8
answer is a

Ans 12:

Class : Class 6
IF WE SHARP A PENCIL IT IS A PHYSICAL IRREVERSIBLE CHANGE .SO,IF WE HEAT A POT IS PHYSICAL IRREVERSIBLE CHANGE. BUT IT COULD HAPPEN THAT THE COMPOSITION OF CLAY MIGHT CHANE BECAUSE OF HEATING AS THE MOLECULES STICK TO EACH OTHER

Ans 13:

Class : Class 7
c is the correct answer

Ans 14:

Class : Class 6
The answer is A.

Ans 15:

Class : Class 7
A is correct because it just turns hard but it is still clay only.And also chemical change doesn't mean that it is irreversible,Chemical change means that the identity of the substance we started with is lost.Here the identity is not lost.So A is correct.

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Subject :NSO    Class : Class 7

A student took an iron rod and a wooden rod and wrapped each of them in a piece of paper. These were then heated as shown. It was found that the paper around the iron rod does not burn whereas the one around the wooden rod catches fire. It is because


A Candle, in case of iron rod, is nearer to the paper
B Wood being a bad conductor of heat, takes away all the heat
C Iron being a good conductor of heat, conducts away the heat given to the paper
D Paper, in first case, is thicker.


could someone please explain the answer

Ans 1:

Class : Class 7
answer is option c

Ans 2:

Class : Class 8

Ans 3:

Class : Class 7
Please explain it to me.

Ans 4:

Class : Class 7

Ans 5:

Class : Class 9
can someone explain why?

Ans 6:

Class : Class 8
ans is option C

Ans 7:

Class : Class 9
ans is option C

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Subject :NSO    Class : Class 4

Ans 1:

Class : Class 5
jk kj;

Ans 2:

Class : Class 5
Not kerwa its kewra. It is an extract that is distilled from the flower of the Pandanus plant. Kewra water is very similar to rosewater. It is used to flavour South Asian cuisine.

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