JEE Questions for Physics Magnetism And Matter Quiz 11 - MCQExams.com

If a diamagnetic solution is poured into a U–tube and one arm of this U–tube placed between the poles of a strong magnet with the meniscus in a line with the field, then the level of the solution will
  • Rise
  • Fall
  • Oscillate slowly
  • Remain as such
Which of the following is true ?
  • Diamagnetism is temperature dependent
  • Paramagnetism is temperature dependent
  • Paramagnetism is temperature independent
  • None of the above
Identify the paramagnetic substance
  • Iron
  • Aluminum
  • Nickel
  • Hydrogen
If a magnetic substance is kept in a magnetic field, then which of the following is thrown out
  • Paramagnetic
  • Ferromagnetic
  • Diamagnetic
  • Antiferromagnetic

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  • Physics-Magnetism and Matter-78221.png
  • 2)
    Physics-Magnetism and Matter-78222.png

  • Physics-Magnetism and Matter-78223.png

  • Physics-Magnetism and Matter-78224.png
Which of the following statements is incorrect about hysteresis?
  • This effect is common to all ferromagnetic substances
  • The hysteresis loop area is proportional to the thermal energy developed per unit volume of the material
  • The hysteresis loop area is independent of the thermal energy developed per unit volume of the material
  • The shape of the hysteresis loop is characteristic of the material
A small rod of bismuth is suspended freely between the poles of strong electromagnet. It is found to arrange itself at right angles to the magnetic field. This observation establishes that bismuth is
  • Diamagnetic
  • Paramagnetic
  • Ferrimegnetic
  • Antiferromagnetic
Which one of the following is a non magnetic substance?
  • Iron
  • Nickel
  • Cobalt
  • Brass
Curie-Weiss law is obeyed by iron at a temperature
  • Below Curie temperature
  • Above Curie temperature
  • At Curie temperature only
  • At all temperatures
The magnetic susceptibility of any paramagnetic material changes with absolute temperature T as
  • Directly proportional to T
  • Remains constant
  • Inversely proportional to T
  • Exponentially decaying with T
When a piece of a ferromagnetic substance is put in a uniform magnetic field, the flux density inside it is four times the flux density away from the piece. The magnetic permeability of the material is
  • 1
  • 2
  • 3
  • 4
Which of the following is diamagnetic
  • Aluminum
  • Quartz
  • Nickel
  • Bismuth
If a ferromagnetic material is inserted in a current carrying solenoid, the magnetic field of solenoid
  • Largely increases
  • Slightly increases
  • Largely decreases
  • Slightly decreases
In the hysteresis cycle, the value of H needed to make the intensity of magnetization zero is called
  • Retentivity
  • Coercive force
  • Lorentz force
  • None of these
Among the following properties describing diamagnetism identify the property that is wrongly stated
  • Diamagnetic materials do not have permanent magnetic moment
  • Diamagnetism is explained in terms of electromagnetic induction
  • Diamagnetic materials have a small positive susceptibility
  • The magnetic moment of individual electrons neutralize each other
Needles N1, N2 and N3 are made of a ferromagnetic, a paramagnetic and a diamagnetic substance respectively. A magnet when brought close to them will
  • Attract N1 strongly, N2 weakly and repel N3 weakly
  • Attract N1 strongly, but repel N2 and N3 weakly
  • Attract all three of them
  • Attract N1 and N2 strongly but repel N3
Domain formation is the necessary feature of
  • Ferromagnetism
  • Paramagnetism
  • Diamagnetism
  • All of the above
Which one of the following is not a characteristics of diamagnetism?
  • The diamagnetic materials are repelled by a bar magnet
  • The magnetic susceptibility of the materials is small and negative
  • The origin of dia magnetism is the spin of electrons
  • The material move from a region of strong magnetic field to weak magnetic field
Choose the correct statement
  • A paramagnetic material tends to move from a strong magnetic field to weak magnetic field
  • A magnetic material is in the paramagnetic phase below its Curie temperature
  • The resultant magnetic moment in an atom of a diamagnetic substance is zero
  • The susceptibility of a ferromagnetic material is slightly greater than 1
Two identical magnetic dipoles of magnetic moment 1.0 Am2 each, placed at a separation of 2 m with their axes perpendicular to each other. The resultant magnetic field at a point midway between the dipoles is
  • 5 × 10–7 T
  • 2)
    Physics-Magnetism and Matter-78228.png
  • 10–7 T
  • None of these
Two short magnets placed along the same axis with their like poles facing each other repel each other with a force which varies inversely as
  • Square of the distance
  • Cube of the distance
  • Distance
  • Fouth power of the distance
Two identical short bar magnets, each having magnetic moment M, are placed a distance of 2d apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is

  • Physics-Magnetism and Matter-78231.png
  • 2)
    Physics-Magnetism and Matter-78232.png

  • Physics-Magnetism and Matter-78233.png

  • Physics-Magnetism and Matter-78234.png
A dip circle is adjusted so that its needle moves freely in the magnetic meridian. In this position, the angle of dip is 40° . Now the dip circle is rotated so that the plane in which the needle moves makes an angle of 30° with the magnetic meridian. In this position the needle will dip by an angle
  • 40°
  • 30°
  • More than 40°
  • Less than 40°
A short bar magnet with its north pole facing north forms a natural point at P in the horizontal plane. If the magnet is rotated by 90° in the horizontal plane, the net magnetic induction at P is (Horizontal component of earth\'s magnetic field = BH)
  • 0
  • 2)
    Physics-Magnetism and Matter-78237.png

  • Physics-Magnetism and Matter-78238.png

  • Physics-Magnetism and Matter-78239.png
The true value of angle of dip at a place is 60°, the apparent dip in a plane inclined at an angle of 30° with magnetic meridian is

  • Physics-Magnetism and Matter-78241.png
  • 2)
    Physics-Magnetism and Matter-78242.png

  • Physics-Magnetism and Matter-78243.png
  • None of these
In a vibration magnetometer, the time period of a bar magnet oscillating in horizontal component of earth\'s magnetic field is 2 sec. When a magnet is brought near and parallel to it, the time period reduces to 1 sec. The ratio H/F of the horizontal component H and the field F due to magnet will be
  • 3
  • 1/3

  • Physics-Magnetism and Matter-78245.png

  • Physics-Magnetism and Matter-78246.png

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  • Physics-Magnetism and Matter-78249.png
  • 2)
    Physics-Magnetism and Matter-78250.png

  • Physics-Magnetism and Matter-78251.png

  • Physics-Magnetism and Matter-78252.png
Two magnets of equal mass are joined at right angles to each other as shown. Magnet 1 has a magnetic moment 3 times that of magnet 2. This arrangement is pivoted so that it is free to rotate in the horizontal plane. In equilibrium what angle will the magnet 1 subtend with the magnetic meridian
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  • Physics-Magnetism and Matter-78255.png
  • 2)
    Physics-Magnetism and Matter-78256.png

  • Physics-Magnetism and Matter-78257.png

  • Physics-Magnetism and Matter-78258.png
A short magnet oscillates with a time period 0.1 s at a place where horizontal magnetic field is 24 µt. A downward current of 18 A is established in a vertical wire 20 cm east of the magnet. The new time period of oscillator
  • 0.1 s
  • 0.089 s
  • 0.076 s
  • 0.057 s
Two magnets A and B are identical and these are arranged as shown in the figure. Their length is negligible in comparison to the separation between them. A magnetic needle is placed between the magnets at point P which gets deflected through an angle θ under the influence of magnets. The ratio of distance d1 and d2 will be
Physics-Magnetism and Matter-78261.png
  • (2 tan θ)1/3
  • (2 tan θ)–1/3
  • (2 cot θ)1/3
  • (2 cot θ)–1/3
0:0:1


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