NEET Physics Earths Magnetism Magnetic Materials and their Properties MCQs Set A

Question. The strength of the earth’s magnetic field is
(a) vary from place to place on the earth’s surface
(b) having very high value
(c) zero everywhere
(d) constant everywhere

Answer: A

Question. Which of the following is responsible for the earth’s magnetic field?
(a) Convective currents in earth’s core.
(b) Diversive current in earth’s core.
(c) Rotational motion of earth
(d) Translational motion of earth.

Answer: A

Question. The lines of force due to earth’s horizontal magnetic field are
(a) concentric circles
(b) curved lines
(c) parallel and straight
(d) elliptical

Answer: A

Question. The earth’s magnetic field always has a vertical component except at the
(a) magnetic equator
(b) geographic north pole
(c) magnetic poles
(d) latitude 45º

Answer: A

Question. At magnetic poles, the angle of dip is
(a) 90º
(b) zero
(c) 30º
(d) 45º

Answer: A

Question. One can define ...A... of a place as the vertical plane which passes through the imaginary line joining the magnetic North and the South–poles. Here, A refers to
(a) magnetic meridian
(b) magnetic inclination
(c) geographic meridian
(d) magnetic declination

Answer: A

Question. The ratio of intensity of magnetisation and magnetising field is called
(a) magnetic susceptibility
(b) magnetic intensity
(c) permeability
(d) magnetic intensity

Answer: A

Question. At the magnetic north pole of the earth, the value of the horizontal component of earth’s magnetic field and angle of dip are respectively
(a) zero, maximum
(b) maximum, maximum
(c) maximum, minimum
(d) minimum, minimum

Answer: A

Question. The magnetic compass is not useful for navigation near the magnetic poles, since
(a) H = 0
(b) V = 0
(c) R = 0
(d) None of these

Answer: A

Question. Metals getting magnetised by orientation of atomic magnetic moments in external magnetic field are called
(a) paramagnetic
(b) antimagnetic
(c) diamagnetic
(d) ferromagnetic

Answer: A

Question. The magnetic susceptibility for diamagnetic materials is
(a) small and negative
(b) large and positive
(c) large and negative
(d) small and positive

Answer: A

Question. Among which of the following the magnetic susceptibility does not depend on the temperature?
(a) Dia-magnetism
(b) Ferro-magnetism
(c) Para-magnetism
(d) Ferrite

Answer: A

Question. Curie temperature is the temperature above which
(a) a ferromagnetic material becomes paramagenetic
(b) a paramagnetic material becomes diamagnetic
(c) a ferromagnetic material becomes diamagnetic
(d) a paramagnetic meterial becomes ferromagnetic

Answer: A

Question. A material is placed in a magnetic field and it is thrown out of it. Then the material is
(a) diamagnetic
(b) non-magnetic
(c) paramagnetic
(d) ferromagnetic

Answer: A