Magnetism & Matter PYQs Set 6 (PDF)

Set 6 of 6 · Questions 151-164 of 164

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Mere Teacher · Previous Year Questions NEET Physics · Magnetism & Matter · Set 6 (Q151-164)
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151. $Choose the correct option:$ (1) $True dip is not mathematically related to apparent dip.$ (2) $True dip is less than apparent dip.$ (3) $True dip is always greater than the apparent dip.$ (4) $True dip is always equal to apparent dip.$ 152. $If χ is the susceptibility and μ_{r} is the relative permeability of a ferromagnetic substance, then$ (1) $χ<<1$ (2) $μ_{r} << 1$ (3) $μ_{r} = 0$ (4) $χ>>1$ 153. $Coercivity of a magnet where the ferromagnet gets completely demagnetized is 3 \times 10^{3} Am^{- 1} . The minimum current required to be passed in a solenoid having 1000 turns per metre, so that the magnet gets completely demagnetized when placed inside the solenoid is$ (1) $3 A$ (2) $30 mA$ (3) $6 A$ (4) $60 mA$ 154. $The magnetic susceptibility is negative for$ (1) $ferromagnetic material only$ (2) $paramagnetic and ferromagnetic materials$ (3) $diamagnetic material only$ (4) $paramagnetic material only$ 155. $The materials suitable for making electromagnets should have$ (1) $high retentivity and high coercivity$ (2) $low retentivity and low coercivity$ (3) $high retentivity and low coercivity$ (4) $low retentivity and high coercivity$ 156. $Which of the following properties is 'False' for a bar magnet?$ (1) $It doesn't produce magnetic field.$ (2) $Its poles cannot be separated.$ (3) $It points in North-South direction when suspended.$ (4) $Its like poles repel and unlike poles attract.$ 157. $A bar magnet of magnetic moment M is placed at right angles to a magnetic induction B . If a force F is experienced by each pole of the magnet, the length of the magnet will be$ (1) $MB / F$ (2) $BF / M$ (3) $MF / B$ (4) $F / MB$ 158. $Paramagnetic substances: (A) align themselves along the directions of external magnetic field.(B) attract strongly towards external magnetic field.(C) has susceptibility little more than zero. (D) move from a region of strong magnetic field to weak magnetic field. Choose the most appropriate answer from the options given below:$ (1) $A, B, C Only$ (2) $A, B, C, D$ (3) $A, C Only$ (4) $B, D Only$ 159. $In a permanent magnet at room temperature$ (1) $domains are partially aligned$ (2) $domains are all perfectly aligned$ (3) $magnetic moment of each molecule is zero$ (4) $the individual molecules have non-zero magnetic moment which are all perfectly aligned.$ 160. $Among which the magnetic susceptibility does not depend on the temperature?$ (1) $diamagnetism$ (2) $paramagnetic$ (3) $ferromagnetism$ (4) $ferrite$ 161. $A soap bubble, blown by a mechanical pump at the mouth of a tube, increases in volume, with time, at a constant rate. The graph that correctly depicts the time dependence of pressure inside the bubble is given by:$ (1) (2) (3) (4) 162. $A diamagnetic material in a magnetic field moves$ (1) $from stronger to the weaker parts of the field$ (2) $from weaker to the stronger parts of the field$ (3) $perpendicular to the field$ (4) $in none of the above directions$ 163. $A bar magnet of length 16 cm is placed in the magnetic meridian with the N -pole pointing towards geographical north. Two neutral points separated by 12 cm are obtained on the equatorial line of the magnet. If the horizontal component of earth's magnetic field = 3.2 \times 10^{- 5} T, then the pole strength of magnet is$ (1) $0.25 Am$ (2) $0.5 Am$ (3) $1 Am$ (4) $2 Am$ 164. $Which of the following do not exist?$ (1) $Electric dipoles$ (2) $Electric monopoles$ (3) $Magnetic monopoles$ (4) $Magnetic dipoles$