National Science Olympiad Forum By SOF Olympiad Trainer - Page 775

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AKSHITA.KRISHNAN from DPS Noida, Noida

Subject :NSO Class : Class 3

Shikha has 57 pairs of earrings. If she gives 17 pairs to her sister, they will now have the same number of earrings. How many pairs of earrings does Shikha's sister have at first ?

(A) 17

(B) 23

(D) 33

Ans 1:

Pratha Borar from Jayshree Periwal International School, Jaipur

Class : Class 5

(B) 23

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NIRMAY JOSEPH from St Columba's School, New Delhi , New Delhi

Subject :NSO Class : Class 4

The given flow chart can be used to distinguish between some types of flowering plants.What do M and N represent in the flow chart?

M N

AHas big flowers Has long stem
BHas edible fruitsHas waxy leaves
CHas woody stem Has spores
DHas edible fruitsFloats inside water

View All Answers (3)

Ans 1: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

Ans 2:

Divyamsh from The Sky World School, Panchkula

Class : Class 5

Ans 3:

Divyamsh from The Sky World School, Panchkula

Class : Class 5

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NIRMAY JOSEPH from St Columba's School, New Delhi , New Delhi

Subject :NSO Class : Class 4

A dog is chasing a cat as shown here.

•The cat starts from 8 m and jumps 3 m every time.
•The dog starts from 5 m and jumps 5 m every time.
If they both start at the same time, in which jump will the dog overtake the cat?

A1
B2
C3
D 4

View All Answers (2)

Ans 1:

Dhriti yamana from GEMS Modern Academy, Dubai

Class : Class 4

The answer is c

Ans 2: (Master Answer)

Admin from revisewise, Noida

Class : Class 1

The correct answer is B.

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NIRMAY JOSEPH from St Columba's School, New Delhi , New Delhi

Subject :NSO Class : Class 4

Which of the following metal tumblers will produce the loudest but pleasant sound when struck by a pencil on the sides?

A

B

C

D

View All Answers (2)

Ans 1:

ishit from EUROSCHOOL THANE, THANE WEST

Class : Class 7

Can you tell the answer to this question

Ans 2:

from Podar International School icse, Aurangabad

Class : Class 6

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Kavita G from sri chaitanya techno school, Bengaluru

Subject :NSO Class : Class 6

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Ans 1:

Shaunak Mahapatra from Mount Litera Zee School, Contai

Class : Class 7

Here opt c is correct as if we add all the digits of the no.s in the opt a , b, and d the result is 29 where opt c gives the result 27. Thus, the odd one is the opt c.

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Nishant Doshi from new era senior secondary school nizampura vadodara, Vadodara

Subject :NSO Class : Class 5

If ‘+’ is called ‘ ÷ ’, ‘–’ is called ‘×’, ‘ ÷ ’ is called ‘+’ and ‘×’ is called ‘–’, then 36 × 12 + 4 ÷ 6 + 2 – 3 =?

A 2
B 18
C
D 42

Give explanation.

View All Answers (21)

Ans 1:

Ashee Srivastava from APEEJAY SCHOOL NOIDA , NOIDA

Class : Class 7

very confusing

Ans 2:

Pratyusha Saha from South point school, Kolkata

Class : Class 6

Ans 3:

Haroon T K from Silver Hills public school , Calicut

Class : Class 5

Ans 4:

Anil sinha from DPS, Chandigarh

Class : Class 4

Ans 5:

CHEERANJIT MOHANTA from MATHOPE, BHUBANESWAR

Class : Class 5

how? can not understand.

Ans 6:

Trideev Reddy Maddirevula from IIPS, Riyadh

Class : Class 7

very confusing

Ans 7:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Class : Class 7

I did not write the plus signs . It will be 4 6 , 3 3 and 3 9 .

Ans 8:

Irresh Vijay from NPSI Singapore, Singapore

Class : Class 8

Ans 9:

Siddhant Singhania from The Assembly of God Church School, Purulia, Purulia

Class : Class 8

Ans 10:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Class : Class 7

Everyone , pay attention . In this question , the BODMAS rule ( Bracket , Off , Division , Multiplication , Addition , Subtraction ) is used . Let me explain it . First transform all the signs . The ans . comes 36 - 12 -:- 4 6 -:- 2 x 3 . First we have to do division , then multiplication , then addition and then subtraction . Therefore :-36 - 12 -:- 4 6 -:- 2 x 3 \l/36 - 3 3 x 3 \l/ 36 - 3 9 \l/ 36 - 12 \l/ 24

Ans 11:

Sourav Jena from ODM public school , BHUBANESWAR

Class : Class 4

it is confusing ya

Ans 12:

PARUL GHARSE from Vibgyor, Mumbai

Class : Class 6

it is really confusing

Ans 13:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Class : Class 7

Ans 14:

Dushyant Singh from Shri Ram Centennial School, Indore

Class : Class 6

Very confusing.

Ans 15:

Sohan Choudhury from Delhi Public School Electronic City Bengaluru, Bengaluru

Class : Class 6

Ans 16:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Class : Class 7

Ans 17:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Class : Class 7

Ans 18:

Shreyansh Gupta from MVN, faridabad

Class : Class 7

not confusing let me explain it so when will we replace the sines it will be like this 36-12 divided by 4 6 divided by 2 multiplied by 3 so when will you solve it you will get the answer

Ans 19:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Class : Class 7

Ans 20:

SRISANTH from Edify, Tirupathi

Class : Class 5

The bodmas rule is sometimes not applicable in some cases and if we use both methods it will take about 8 minutes.I even tested it

Ans 21:

Soumyaraj Roy from Kendriya Vidyalaya , Thiruvananthapuram

Class : Class 7

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Nishant Doshi from new era senior secondary school nizampura vadodara, Vadodara

Subject :NSO Class : Class 5

Select the correct option regarding natural resources.

A They can never be exhausted.
B They are obtained from soil only.
C Non-mineral resources include air and water.
D Some of the natural resources are harmful to us.

Give explanation

View All Answers (21)

Ans 1:

Ashmi Narkar from The Shishukunj International School, Jhalaria Campus, Indore

Class : Class 9

How is C the answer? Water has minerals in it. Pls. explain.

Ans 2:

Diya Avinash from Treamis World School, Bangalore

Class : Class 6

Option C is the correct answer

Ans 3:

Syeda Aleeza Zaidi from Somerville school Noida , Noida

Class : Class 5

Ans 4:

AARNA GOEL from UPTON SCHOOL, ENGLAND

Class : Class 6

as per me d

Ans 5:

Sanskriti Nagar from Rose Bud Academy, khagaria

Class : Class 5

Answer is C

Ans 6:

swastik Biswal from St Joseph Convent Higher Secendary school, Sambalpur

Class : Class 5

c correct one pls check it olympiad plz

Ans 7:

Arnav kaul from Chirec, Hyderabad

Class : Class 2

Ans 8:

Pratham Dave from GNS, Bangalore

Class : Class 7

C is the answer to this question

Ans 9:

Rupkatha Bhattacharyya from Ashok hall girls high school, KOLKATA

Class : Class 8

Ans 10:

Arghya Kashyap from Modern Delhi Public School, Faridabad

Class : Class 8

Ans 11:

Ivan Tyagi from Chirec International School , Hyderabad

Class : Class 8

Ans 12:

Goutham Ram from Lecole' Chempaka International, Trivandrum

Class : Class 5

D is right, take tobacco as an example.

Ans 13:

Divyanshi from United international School, Bangalore

Class : Class 6

Therefore lot of correct options.

Ans 14:

Shruthi from VIBGYOR, Mumbai

Class : Class 6

Ans 15:

shaun joel dasari from subs, chennai

Class : Class 4

Ans 16:

Subhang Deep Sahu from Narayana CO Kadugodi Bangalore, Bangalore

Class : Class 8

Ans 17:

Biju Pappachan from Rkc , Raipur

Class : Class 1

C is Correct

Ans 18:

Archit Sanyal from Manav Rachna International , Gurgaon

Class : Class 5

Ytytytytyt it is c c c c c c c c c c c. C cc. C c c c c c

Ans 19:

Kenisha Tamboli from Mansukhbhai Kothari National School, Pune

Class : Class 6

Ans 20:

yuvraj tantia from birla public school, sri ganganagar

Class : Class 5

D is correct

Ans 21:

Ridhan from SFS janakpuri, New Delhi

Class : Class 5

no as per me some resources are harmful like uranium as option d

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j pranav from Dehli Public School Nacharam, Hyderabad

Subject :NSO Class : Class 7

If a body moves with uniform velocity, then

(A) Its initial velocity is zero

(B) Its final velocity is zero

(D) Its change in velocity is zero.

View All Answers (1)

Ans 1:

arijit paul from New Town School, Kolkata

Class : Class 9

I know this answer........................................its (C) Prove me if its wrong

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Amruta Nasikkar from bgs nps, bangalore

Subject :NSO Class : Class 5

21 students are standing in a line. Deepak is in the middle. What is his position from left as well as from right?

A 12^th
B 10^th
C 11^th
D 9^th

View All Answers (15)

Ans 1:

Iraj Singh from DPS Megacity, Kolkata

Class : Class 9

The correct answer is option C - 11th not option B - 10th.

Ans 2:

Bhavya Patidar from Mount Litra Zee School Indore MP India , Indore MP India

Class : Class 5

A-12

Ans 3:

Nishant Doshi from new era senior secondary school nizampura vadodara, Vadodara

Class : Class 7

Deepak is standing in line there are 21 students in line. So , he is one standing in middle so 21 - 1 = 20 . So 20 divide by 2= 10 . Thus , there are 10 students from right as well as left .

Ans 4:

Anusha Agarwal from Convent of jesus and Mary st Anthony junior college , Agra

Class : Class 8

Ans 5:

ARNAV GARG from PRUDENCE SCHOOL, New Delhi

Class : Class 10

Ans 6:

Adarsh from DPS, Raipur

Class : Class 5

Nishant Doshi is correct

Ans 7:

Hari Govind from Delhi Public School Chandigarh , Chandigarh

Class : Class 6

It should be 10

Ans 8:

Bhavya Patidar from Mount Litra Zee School Indore MP India , Indore MP India

Class : Class 5

B-10

Ans 9:

Anusha Agarwal from Convent of jesus and Mary st Anthony junior college , Agra

Class : Class 8

it should be 10

Ans 10:

Anusha Agarwal from Convent of jesus and Mary st Anthony junior college , Agra

Class : Class 8

Ans 11:

Adarsh from DPS, Raipur

Class : Class 5

Answer is 11 as there are 10 people from the right side and 10 from left side except Deepak but Deepak is in middle so he will be counted as 11th 10 10 1 = 21.

Ans 12:

Nishant Doshi from new era senior secondary school nizampura vadodara, Vadodara

Class : Class 7

Deepak is standing in line there are 21 students in line. So , he is one standing in middle so 21 - 1 = 20 . So 20 divide by 2= 10 . Thus , there are 10 students from right as well as left .