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# Notes | EduRev

## NEET : Notes | EduRev

The document Notes | EduRev is a part of the NEET Course Physics 28 Years Past year papers for NEET/AIPMT Class 12.
All you need of NEET at this link: NEET

Q.1. At a point A on the earth's surface the angle of dip Ïƒ = + 25Â°. At a point B on the earth's surface the angle of dip, Ïƒ = - 25Â°. We can interpret that :
A: A and B are both located in the northern hemisphere.
B: A is located in the southern hemisphere and B is located in the northern hemisphere.
C: A is located in the northern hemisphere and B is located in the southern hemisphere.
D: A and B are both located in the southern hemisphere.
Ans:
C
Solution:

point A is located in the Northern hemisphere and point B is located in the southern hemisphere.
basically, angle of dip is the angle made by resultant earth's magnetic field from horizontal.

• angle of dip at equator is considered as zero.
• angle of dip in northern hemisphere is considered as positive.
• angle o dip in southern hemisphere is considered as negative.

here, at point A on the earth's surface,
angle of dip is +25Â° (i.e., positive) so, point A is located in the Northern hemisphere
and point B on the earth's surface, angle of dip is -25Â° (i.e., negative) so, point B is located in he southern hemisphere.

Q.2. A carbon resistor (47 + 4.7) kÎ© is to be marked with rings of different colours for its identification. The colour code sequence will be :-    (2018)
A: Violet â€“ Yellow â€“ Orange â€“ Silver
B: Yellow â€“ Violet â€“ Orange â€“ Silver
C: Yellow â€“ Green â€“ Violet â€“ Gold
D: Green â€“ Orange â€“ Violet â€“ Gold
Ans:
B
Solution:

Q.3. If Î¸1 and Î¸2 be the apparent angles of dip observed in two vertical planes at right angles to each other, then the true angle of dip Î¸ is given by :-     (2017)
A:
B:
C:
D:
Ans: D
Solution:

Q.4. The magnetic susceptibility negative for    (2016)
A: paramagnetic and ferromagnetic materials
B: diamagnetic material only
C: paramagnetic material only
D: ferromagnetic material only

Ans: B
Solution:
Î¼r = 1 + x
so, Î¼r is negative if and only if  x is negative and x is negative only for diamagnetic materials.

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