1. Which of the following has a low value in ferrites ?
(A) Conductivity
(B) Permeability
(C) Magnetic susceptibility
(D) All the above
| Answer ⇒ A |
2. The dimensional representation of magnetic flux density is ;
(A) [MLT-2]
(B) [MLT-2A-1]
(C) [MLT-2A-2]
(D) [MT-2A-1]
| Answer ⇒ D |
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
| Answer ⇒ A |
4. Ferrites may be :
(A) ant ferromagnetic
(B) ferromagnetic
(C) ferrimagnetic
(D) None of the above
| Answer ⇒ B |
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
| Answer ⇒ A |
6. The force acting per unit length of a semi circular wire of radius R carrying a current I is :
| Answer ⇒ A |
7. Which of the following has higher magnetic susceptibility ?
(A) diamagnetic
(B) paramagnetic
(C) ferromagnetic
(D) None of these
| Answer ⇒ C |
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
| Answer ⇒ D |
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
| Answer ⇒ B |
10. The dimensions of magnetic permeability are :
(A) [MLT-2A-2]
(B) [ML2T2A-2]
(C) [ML2T-2A-1]
(D) [M-1LT-2A-2]
| Answer ⇒ A |
11. A magnetic field exerts no force on a/an :
(A) magnetic
(B) unmagnetised iron bar
(C) moving charge
(D) charge at rest
| Answer ⇒ D |
12. Susceptibility is +ve and large for substances.
(A) ferromagnetic
(B) paramagnetic
(C) diamagnetic
(D) non-magnetic
| Answer ⇒ A |
13. SI unit of magnetic pole strength is :
(A) Ampere-metre
(B) Ampere-metre2
(C) Ampere2-metre
(D) Tesla-metre
| Answer ⇒ B |
Class 12th physics objective question in English