12th Physics unit 15 electromagnetic induction MCQs. All MCQs are from previous Boards papers of Inter part 2. 2nd year Physics chapter wise past papers fully solved MCQs.
12th Physics Unit 15 MCQs:
2nd Year Physics Past Papers MCQs:
Split rings are used in:
(A) A.C generator
(B) A.C motor
(C) Transformer
(D) D.C motor
The jerks in D.C motor are created by the use of: (DGK. GII, 2017)
(A) Armature
(B) Commutators
(C) Slip rings
(D) Source of emf
Output of D.C motor is: (GRW. GII, 2017)
(A) A.C energy
(B) Mechanical energy
(C) Chemical energy
(D) D.C energy
The self induction emf is sometimes called: (BWP. GI. 2017)
(A) Motional emf
(B) Constant emf
(C) Back emf
(D) Variable emf
When a motor is over loaded then the magnitude of back emf: (DGK. BWP. GI, 2018)
(A) Increases
(B) Decreases
(C) Remains constant
(D) Zero
When the back emf is zero, its draws: (AJK. GI, 2014) (MLN. GI, 2017)
(A) Zero current
(B) Minimum current
Maximum current
(D) Steady current
Fsc part 2 Physics Electromagnetic Induction MCQs:
The Self induction is given by: (GRW. GI, 2014) (GRW. GII, 2015)
(A) NL = 01
(B) NI = 0L
(C) No = LI
(D) N=LI
The inductance can be increased by winding the wire around a core made of: (LHR. GII, 2014)
(A) Copper
(B) Silicon
(C) Iron
(D) Alumium
With the increase in speed of motor the magnitude of back emf: (SGD. GII, FBD. GI, 2017)
(A) remain same
(B) Increases
(C) decreases
(D) first increases then decreases
When motor is just started, back emf is almost: (MLN. GII, 2016) (LHR. GII, 2018)
(A) Maximum
(B) Zero
(C) Minimum
(D) Infinite
The term has the same dimensions as: (LHR. GII, 2016)
(A) Flux
(B) Potential difference
(C) Time
(D) Current
By winding the cold around a fess magnetic core, self-induction: (GRW.GI, 2016)
(A) Will increase
(B) Will decrease
(C) Remain same
(D) First increase then decrease
If D.C is input for a step-up transformer, then output is: (GRW. GI, 2017)
(A) Zero
(B) High
(C) Low
(D) Maybe high or low
Unit 15 12th Class
The working principle of transformer is: (LHR. GII, 2015)
(A) Self induction.
(B) Faraday’s Law
C) Mutual induction
(D)Electromagnetic induction
Unit of self inductance is: (SGD. GI, 2016) (LHR. GII, 2018)
(A) Weber
(B) Tesla
(C) Henry
(D) Farad
Henry is SI unit of: (GRW. GI, 2016)
(A) Current
(B) Resistance
(C) Flux
(D) Self induction
The application of mutual induction is a: (MLN. GI, 2014)
(A) D.C motor
(B) Radio
(C) Television
(D) Transformer
Self induction does not depend on: (RWP. GI, 2016)
(A) Number of turns of the coil
(B) Area of cross-section of the core
(C) Nature of material of the core
(D) Energy stored in an inductor
For step down transformer. (RWP. GI, 2014) (SWL. GI, 2017)
(A) Ns > Np
(B) Np > Ns
(C) Ns = Np
(D) Ns >>> Np