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Michael Alexander from St. Thomas Public School, Thiruvanthapuram
Subject :NSO    Class : Class 5

The object X is made up of two materials 1 and 2.When the light is shone on it, it casts a shadow on screen as shown in the picture.

Identify materials 1 and 2 of which object X is made.

Material 1 Material 2
A Aluminium foil Thermocol
B Cardboard Clear plastic sheet
C Clear cellophane paper Styrofoam
D Thermocol Cardboard


is answer B correct?

Ans 1:

Samarth Sabari from GIIS, Singapore
Class : Class 9
how is it B!?

Ans 2:

Pratham Dave from GNS, Bangalore
Class : Class 7
In the solutions it is showing C as correct option but in front It is showing B as the answer to this question. please correct the answer.

Ans 3:

RIDHASEN PRIYASEN SHAH from The Rajkumar College, Rajkot, Rajkot
Class : Class 4
The solution itself explains that c is the correct ans. So that means m2 is opaque and m1 is transparent. Please someone correct this ans

Ans 4:

Ankush Ghosh from DPS, Doha
Class : Class 10
2 should be opaque and 1 transparent, or both opaque

Ans 5:

Mohul Gandhi from Podar International School, Powai, Mumbai
Class : Class 8
ans should be c!!! I am reporting an error

Ans 6:

Shreyan from Delhi Public School Bangalore East, Bangalore
Class : Class 5
howwwwwwww ccccccccccc

Ans 7:

Jishnu Dutta from St. Stephen's School, Kolkata
Class : Class 9
Ans is c as you see light can't pass through material 2 and can pass through material 1. According to SOF ans b which mean light can pass through cardboard and can't through clear pastic sheet!!!!!. Please correct this SOF or it can be a typing mistake. Thanks for reading.

Ans 8:

samanvay sinha from School of India, Bangalore, bengaluru
Class : Class 5
There must be a technical issue because when I read the solution, it was written that the correct answer is C.

Ans 9:

Tanvi from hh, delhi
Class : Class 5
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 10:

ARCHISHA SIKDAR from CHOITHRAM MANIKBAG, INDORE
Class : Class 8
ANSWER WILL BE 'C ' CAUSE THROUGH TRANSPARENT MATERIAL WE CANNOT SEE SHADOW OF A THING BUT THROUGH OPAQUE MATERIAL WE CAN SEE A THING'S SHADOW

Ans 11:

Samyaraj Chowdhury from DPS Ruby Park, Kolkata, Kolkata
Class : Class 8
The answer should be C. But answer is given B which is impossible.

Ans 12:

Shreyan from Delhi Public School Bangalore East, Bangalore
Class : Class 5
how is it b

Ans 13:

Ishir Jha from Gyan Ganga Global Academy, Rosera
Class : Class 8
It explains c is the correct ans but on the front it says b. Someone please correct this. They cut my marks also.

Ans 14:

Ishaan Ahuja from TSMS, Noida
Class : Class 6
never use sof trainer they know nothing

Ans 15:

Bhavya Agrawal from Cambridge Court High School , JAIPUR
Class : Class 8
WHY YOU TYPE SO MANY C Ishaan

Ans 16:

Sunishka Khatri from Global Indian International School, Pune
Class : Class 6
The guys who solved the paper and created this test was in hurry. So he did not take efforts to review his answers, hence many answers are wrong here. How will students trust on these guys?

Ans 17:

Ridhan from SFS janakpuri, New Delhi
Class : Class 5
answer is c sof is wrong

Ans 18:

Shreyasi Padihary from The Cambridge International School , Bangalore
Class : Class 7
The ans should be C.

Ans 19:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 4

Ans 20:

Aarush Thakur from DPS, Gurgaon
Class : Class 6
The sol says ans is C but it correct ans is B.

Ans 21:

Ishaan Ahuja from TSMS, Noida
Class : Class 6
cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Ans 22:

ishaani vats from shriram school, gurgaon
Class : Class 5
I could not find any logic in this answer. Can anyone explain it? THANS FOR READING!!!

Ans 23:

Srija Das from Sent Joseph Convent Chandannagar, Serampore
Class : Class 10
CORRECT ANSWER SHOULD BE C

Ans 24:

from kalyan, Kalyan
Class : Class 6
Blunders made by SOF. PLEASE FIX THIS !!!!!

Ans 25:

P A Reyyansh from Ann Mary School, Dehradun
Class : Class 10
IF SOF CAN EXPLAIN THIS CORRECTLY, THEN I WILL STOP DOING PRACTICE OF ANY OLYMPIAD

Ans 26:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 8
the answer is c 'cause material 1 is transparent and material 2 is opaque. The solution also says c. Typing error. Thanks for reading

Ans 27:

Swastik Srivastava from Baldwin Boys High School, Bangalore
Class : Class 5
correct ans is C

Ans 28:

Devina kashyap from TPS, Mumbai
Class : Class 4
and should be C and i did C cut now it is showing that i have done B!!

Ans 29:

Arnav kaul from Chirec, Hyderabad
Class : Class 2

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