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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:

Class : Class 7
The ans should be C.

Ans 2:

Class : Class 10
2 should be opaque and 1 transparent, or both opaque

Ans 3:

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 4:

Class : Class 10
CORRECT ANSWER SHOULD BE C

Ans 5:

Class : Class 6
never use sof trainer they know nothing

Ans 6:

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 7:

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:

Class : Class 8
WHY YOU TYPE SO MANY C Ishaan

Ans 9:

Class : Class 6
Blunders made by SOF. PLEASE FIX THIS !!!!!

Ans 10:

Class : Class 4

Ans 11:

Class : Class 9
how is it B!?

Ans 12:

Class : Class 10
IF SOF CAN EXPLAIN THIS CORRECTLY, THEN I WILL STOP DOING PRACTICE OF ANY OLYMPIAD

Ans 13:

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 14:

Class : Class 5
howwwwwwww ccccccccccc

Ans 15:

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 16:

Class : Class 4
and should be C and i did C cut now it is showing that i have done B!!

Ans 17:

Class : Class 2

Ans 18:

Class : Class 5
correct ans is C

Ans 19:

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 20:

Class : Class 5
answer is c sof is wrong

Ans 21:

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 22:

Class : Class 6
cccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Ans 23:

Class : Class 5
how is it b

Ans 24:

Class : Class 5
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

Ans 25:

Class : Class 6
The sol says ans is C but it correct ans is B.

Ans 26:

Class : Class 5
I could not find any logic in this answer. Can anyone explain it? THANS FOR READING!!!

Ans 27:

Class : Class 8
The answer should be C. But answer is given B which is impossible.

Ans 28:

Class : Class 8
ans should be c!!! I am reporting an error

Ans 29:

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

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