physics mcq in hindi

Q.12 Magnetic Resonance Imaging (MRI) is used to identify the image of
A) Tumors and inflamed tissues                         C) Skin cells
B) Blood cells                                                    D) Bone structures

Q.13 Magnetic field strength is measure in:
A) Wbm^-1                                                             C) Wbm²
B) Wbm^-2                                                             D) Wb
Q.14 Force on current carrying conductor per unit length is given by:
A) IL sinϴ                                             B) IL
B) ILB                                                   D) IB sinϴ
Q.15 If ‘A’ is fundamental dimension of ampere then the dimension of magnetic field strength is:
A) [MT²A^-2]                                            C) [MT²L²A^-1]
B) [MT²A^-1]                                            D) [MT²L^-2A^-2]

Q.16 ‘F’ is maximum force acting on a conductor. Now if we change the direction of conductor by
making an angle of 45° with the magnetic field then the force becomes:
A)F /2                                       C)F/ 2√
B) 2F                                        D) √2 F
Q.17 If we doubled all the parameters of the force acting on current carrying conductor and θ = 90°
then magnetic force become s:
A) Half                                                  C) Eight-times
B) Double                                             D) Four-times
Q.18 The force acting on current carrying conductor will be maximum if the angle between magnetic
field and conductor is:
A) 0°                                         C) 90°
B) 30°                                       D) 60°