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Iron core is used in tranformer to:
Keep flux the same
Decrease the flux
Enhance the flux
botha a and b
The value of refractive index of water is:
1.36
1.39
2.33
1.33
George Boole invented:
Boolean algebra
Mean algebra
Arithmetic algebra
Geometry
Magnetic effect of electric current was first discovered by:
Lenz
Faraday
Volta
Ampere
The step up transformer
Has less turns in hte secondary coil
Increase the input voltage
Has more turns in the primary
Increases the input current
Transformer works on _______ supply.
D.C
Both A and B
A.C
Battery
In totally reflecting prism one angle is of:
45°
90°
180°
120°
A transformer has 100 turns in its primary and 500 turns in secondary coil. If 6 volts D.C is applied across its primary, the voltage induced across its secondary coil will be:
30 volts
0 volt
45 volts
60 volts
In compound microscope, the objective have focal length than eye piece
Equal and larger
Larger
Equal
Smaller
Which device has two coils, primary and secondary?
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