Q) P : The magnetic field lines always start from north pole.
Q : The magnetic field lines are open loops.
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
Q) 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
Q) Match the following and select correct option:
| Group -A | Group – B |
| 1) DYNAMO rule ( ) | A) Gauss |
| 2) Magnetic field ( ) | B) Fleming’s right hand rule |
| 3) Electro magnet ( ) | C) Weber |
| 4) Magnetic flux ( ) | D) Microphone |
Q) 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
Q) Which is not a application of the Faraday’s law?
A) Washing machine
B) Induction stove
C) Security check gate
D) ATM card
Q) In an AC generator direction of current changes because of _______
A) external magnet
B) carbon brushes
C) slip rings
D) all the above
Q) The frequency of direct current is _____________Hz.
A) 0
B) 50
C) 60
D) 100
Q) 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
Q) 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
Explanation: n=
A = 60° D = 30°
∴ n =
= sin 45°/sin 30° =
= 1/ √2 X ½ =
=
= √2
Q) The lens that is used to rectify hypermetropia
A) Concave
B) Convex
C) Cylindrical
D) None