71)P : The magnetic field lines always start from north pole.
A) P is true, Q is false
B) P is false, Q is true
C) P and Q are false
D) P and Q are true
72)The power delivered by a battery of emf 20 V is 40 W. Then the current delivered by the battery is
A) 0.5 ampere
B) 2 ampere
C) 60 ampere
D) 800 ampere
73)Match the following and select correct option:
A) DYNAMO rule a:) Fleming’s right hand rule
B) Magnetic field b:) Gauss
C) Electro magnet c:) Microphone
D) Magnetic flux d:) Weber
74)By using Kirchhoff loop law find the value of ‘x’ in given circuit.
A) 2 ohm
B) 3 ohm
C) 5 ohm
D) 4 ohm
1 + IR2 = 01 = 15V, I = 3A; R1 =2 ohm2 = x ohm
75)Which is not a application of the Faraday’s law?
A) Washing machine
B) Induction stove
C) Security check gate
D) ATM card
76)In an AC generator direction of current changes because of _______
A) external magnet
B) carbon brushes
C) slip rings
D) all the above
77)The frequency of direct current is _____________Hz.
78)When light passes through the liquids the change of frequency of Scattered light is related to
A) Raman effect
B) Snell’s law
C) Total internal reflection
D) None of these
79)If the minimum angle of deviation is 30° with a Prism of angle 60°. Find the refractive index of the material of the Prism.
A) √2
B) √3
C) √3/√2
D) √2/√3
A) √2
Explanation:n=
A = 60° D = 30° ∴ n =
= sin 45°/sin 30° =
= 1/ √2 X ½ =
=
= √2
80)The lens that is used to rectify hypermetropia
A) Concave
B) Convex
C) Cylindrical
D) None
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A = 60° D = 30° ∴ n = 
= sin 45°/sin 30° = 
= 1/ √2 X ½ = 
= 
= √2
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