National Science Olympiad Forum By SOF Olympiad Trainer - Page 152

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Subject :NSO    Class : Class 7

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8

Ans 2:

Class : Class 6

Ans 3:

Class : Class 6

Ans 4:

Class : Class 6
The needle should point towards South pole because the Earth's North Pole is actually the South pole of a bar magnet. Compass needle always points to the geographical North pole.

Ans 5:

Class : Class 6
But a compass always points to the magnetic north pole, not geographic north pole right?

Ans 6:

Class : Class 6
it should be ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc

Ans 7:

Class : Class 6
North and South attract each other. Since the compass is placed in the middle of the bar magnet and not ON it and the North pole of the compass needle can face the South pole of the magnet diagonally only, should not the correct answer be C? Also, the north pole of the Earth's magnetic field should not come into consideration here, I think.

Ans 8:

Class : Class 6
Shouldn't the correct answer be (A), since a compass needle ALWAYS points in the North Direction? Pls Help.

Ans 9:

Class : Class 7
The earth's north pole acts like a south pole to the magnet as it attracts the north pole of a magnet (The earth's north pole attracts the north pole of a magnet). This means that the needle of a compass is always the north pole. So, the needle will point to the south pole of the other magnet. In simple words, the North pole of the earth is actually the south pole for a magnet.

Ans 10:

Class : Class 6
shall be BBBBBBBBBBBBBBBBBBBBBBBBBBB

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 6

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Subject :NSO    Class : Class 6

Ans 1:

Class : Class 8
Can anyone please explain?

Ans 2:

Class : Class 6
The answer should be 9m as 12 2=14-5=9

Ans 3:

Class : Class 6
explain

Ans 4:

Class : Class 6
Here it is asking how far away boy Y would APPEAR to be in the mirror to boy X, as in, from boy X's perspective. Y is 12 m away from the MIRROR. He moves 5 m closer12-5=7This is where confusion may set in. A lot of people have added X's distance from the mirror(2 m)7 2=9Here, we are getting the total as 9 m.. However, it is also necessary to add 2 m for the reflected ray to travel to X so that he can see the image.9 2=11Hence, the answer is 11 m.

Ans 5:

Class : Class 6

Ans 6:

Class : Class 7
it is 9m as 12m - 5m = 7m , 7m 2m = 9m , kindly the correct answer is 9m .

Ans 7:

Class : Class 6

Ans 8:

Class : Class 6
please explain

Ans 9:

Class : Class 8
Please explain

Ans 10:

Class : Class 8
Correct answer is 9m. Already explained in olympaid prep-guide book.

Ans 11:

Class : Class 7
@ Rachita Gupta-I don't know I'm confused now.

Ans 12:

Class : Class 6
Should be ( as 12 2

Ans 13:

Class : Class 7
Tis is not in synopsis

Ans 14:

Class : Class 8

Ans 15:

Class : Class 2
12-5 =7 7 2=9answer is 9

Ans 16:

Class : Class 8
Does anyone understand this?

Ans 17:

Class : Class 7
The answer should be 9

Ans 18:

Class : Class 7

Ans 19:

Class : Class 7
@Rachita Gupta- They are asking how far away boy-y would appear to be from BOY-X not the mirror so I'm guessing it should be 9m.

Ans 20:

Class : Class 6
answer is 9

Ans 21:

Class : Class 6
Kindly explain.......

Ans 22:

Class :
Please give more questions like this

Ans 23:

Class : Class 7
the distance in the mirror of boy y would be 9m but distance from mirror to boy x would be 9 plus 2= 11

Ans 24:

Class : Class 7
How 11cm

Ans 25:

Class : Class 2
12-5=77*2=14that should be the answer

Ans 26:

Class : Class 7
answer should be 9

Ans 27:

Class : Class 7
It's nine.

Ans 28:

Class : Class 6

Ans 29:

Class : Class 6
The answer is 9m only, as there are 2 methods: 1. 12 2=14m. 14-5=9m. 2. 12-5=7m. 7 2=9m.

Ans 30:

Class : Class 6
9 should be the answer

Ans 31:

Class : Class 7

Ans 32:

Class : Class 8
Yes austin

Ans 33:

Class : Class 6

Ans 34:

Class : Class 7

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Subject :NSO    Class : Class 2

Ans 1:

Class : Class 7
It is so easy

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Subject :NSO    Class : Class 10

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Subject :NSO    Class : Class 8

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Subject :NSO    Class : Class 4

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Subject :NSO    Class : Class 2

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