1
) Current in LCR circuit becomes extremely large
when ………………. ,
A )
inductive reactance is larger
than capacitance reactance .
B ) Capacitance reactance is larger than inductance
reactance .
C )
inductive reactance and capacitance reactance are equall .
D ) None of these ,
Correct
Answer : - C ) inductive
reactance and capacitance
reactance are equall .
2
) Magnitude of vectors A , B
and C are 12 , 5 and 13 units
and A + B = C . So angle θ ?
A ) 0 degree , B ) 90 degree ,
C ) 180 degree , D ) None of these ,
Correct
Answer : -
Solution
: -
Formula
: -
(C)^2 = (A)^2+ (B)^2 + 2ABCos θ .
So ,
Ø ( 13 )^2 = ( 12 )^2 + ( 5 )^2 + 2 (
12 ) * ( 5 ) * Cos θ ,
Ø 169 = 144 + 25 + 120 * Cos θ ,
Ø ( 169 – 144 – 25 ) / 120 = Cos θ
,
Ø 0 / 120 = Cos θ ,
Ø 
Ø θ = 90 degree ,
Answer .
3
) Relation between resistance and radius
of material : -
R
= Resistance , r = radius .
A ) R α 1 / (r)^2 , B ) R α 1 / (r)^3 ,
C ) R α 1 / (r)^4 , D ) None of these ,
Correct
Answer : - C ) R α 1 / (r)^4 ,
4
) An inductor also called as a coil ,
choke or reactor .
5
) The color of light emitting diode (
LED ) depends on ………………… ,
A ) Semiconductor
material , B )
Conductor ,
C ) Its resistivity , D ) None
of these ,
Correct
Answer : - A ) Semiconductor
material ,
6
) The bulk properties of material such
as their mode of fracture can be related to their ……….. ,
A ) Cleavage
, B
) junction ,
C ) Closure , D
) None of these ,
Correct
Answer : - A ) Cleavage
,
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