1. Which of the following has a low value in ferrites ?

(A) Conductivity
(B) Permeability
(C) Magnetic susceptibility
(D) All the above

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2. The dimensional representation of magnetic flux density is ;

(A) [MLT^-2]
(B) [MLT^-2A^-1]
(C) [MLT^-2A^-2]
(D) [MT^-2A^-1]

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3. Tangent law is applicable only when :

(A) two uniform and mutually perpendicular magnetic fields exist
(B) two magnetic fields exist
(c) horizontal component of earth’s magnetic field is present
(D) uniform magnetic field are used

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4. Ferrites may be :

(A) ant ferromagnetic
(B) ferromagnetic
(C) ferrimagnetic
(D) None of the above

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5. A magnetic dipole moment is a vector quantity directed from :

(A) S to N
(B) N to S
(C) E to W
(D) W to E

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6. The force acting per unit length of a semi circular wire of radius R carrying a current I is :

 

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7. Which of the following has higher magnetic susceptibility ?

(A) diamagnetic
(B) paramagnetic
(C) ferromagnetic
(D) None of these

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8. The magnetic field of earth is due to :

(A) induction effect of the sun
(B) the presence of a large magnet at the centre of the earth
(C) interaction of cosmic rays with the current of earth
(D) motion and distribution of some material in an outside the earth

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9. Direction of magnetic field can determined by :

(A) declination only
(B) inclination only
(C) inclination and horizontal component of field
(D) declination and horizontal component of field

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10. The dimensions of magnetic permeability are :

(A) [MLT^-2A^-2]
(B) [ML²T²A^-2]
(C) [ML²T^-2A^-1]
(D) [M^-1LT^-2A^-2]

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11. A magnetic field exerts no force on a/an :

(A) magnetic
(B) unmagnetised iron bar
(C) moving charge
(D) charge at rest

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12. Susceptibility is +ve and large for substances.

(A) ferromagnetic
(B) paramagnetic
(C) diamagnetic
(D) non-magnetic

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13. SI unit of magnetic pole strength is :

(A) Ampere-metre
(B) Ampere-metre²
(C) Ampere²-metre
(D) Tesla-metre