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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:

Agastya Tripathi from dps gurgaon, Gurgaon
Class : Class 7

Ans 2:

from St. Stephen's School, Kolkata
Class : Class 6
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 3:

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 4:

Srija Das from Sent Joseph Convent Chandannagar, Serampore
Class : Class 6
CORRECT ANSWER SHOULD BE C

Ans 5:

Pragun goel from Venkateshwar International School, Delhi
Class : Class 7
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 6:

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

Ans 7:

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 8:

ARCHISHA SIKDAR from CHOITHRAM MANIKBAG, INDORE
Class : Class 5
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 9:

Ankita Dave from GNS, Bangalore
Class : Class 4
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 10:

Ishir Jha from Keshav Saraswati Vidya Mandir, Patna
Class : Class 6
It explains c is the correct ans but on the front it says b. Someone please correct this. They cut my marks also.

Ans 11:

P A Reyyansh from Ann Mary School, Dehradun
Class : Class 6
IF SOF CAN EXPLAIN THIS CORRECTLY, THEN I WILL STOP DOING PRACTICE OF ANY OLYMPIAD

Ans 12:

Ishaan Ahuja from TSMS, Noida
Class : Class 5
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Ans 13:

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

Ans 14:

Mohul Gandhi from K V IIT Bombay Powai, Mumbai
Class : Class 4
ans should be c!!! I am reporting an error

Ans 15:

Samarth Sabari from GIIS, Singapore
Class : Class 6
how is it B!?

Ans 16:

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

Ans 17:

Arnav kaul from Chirec, Hyderabad
Class : Class 5

Ans 18:

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 19:

Samyaraj Chowdhury from DPS Ruby Park, Kolkata, Kolkata
Class : Class 6
The answer should be C. But answer is given B which is impossible.

Ans 20:

Ankush Ghosh from DPS, Doha
Class : Class 8
2 should be opaque and 1 transparent, or both opaque

Ans 21:

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

Ans 22:

Bhavya Agrawal from Cambridge Court High School , JAIPUR
Class : Class 6
WHY YOU TYPE SO MANY C Ishaan

Ans 23:

Ishaan Ahuja from TSMS, Noida
Class : Class 5
never use sof trainer they know nothing

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