JEE Questions for Physics Magnetism And Matter Quiz 1 - MCQExams.com

Magnetic moment of bar magnet is M. The work done to turn the magnet by 90° of magnet in direction of magnetic field B will be
  • zero
  • 1/2 MB
  • 2MB
  • MB
The susceptibility of a magnetism at 300 K is 1.2 × 10-5. The temperature at which the susceptibility increases to 1.8 × 10-5 is
  • 150 K
  • 200 K
  • 250 K
  • 20 K
A susceptibility of a certain magnetic material is 400 . What is the class of the magnetic material ?
  • Diamagnetic
  • Paramagnetic
  • Ferromagnetic
  • Ferroelectric
The magnetic susceptibility is negative for
  • only paramagnetic materials
  • only diamagnetic materials
  • only Ferromagnetic materials
  • paramagnetic and ferromagnetic materials
The magnetic susceptibility of a paramagnetic substance at –73° C is 0.0060, then its value at –173° C will be
  • 0.0030
  • 0.0120
  • 0.0180
  • 0.0045
On applying an external magnetic field, to a ferromagnetic substance domains
  • align in the direction of magnetic field
  • align in the direction opposite to magnetic field
  • remain unaffected
  • None of the above
A superconducting material is
  • ferromagnetic
  • ferroelectric
  • diamagnetic
  • paramagnetic
Which of the following is represented by the area enclosed by a hysteresis loop ( B–H curve ) ?
  • Permeability
  • Retenetivity
  • Heat energy lost per unit volume in the sample
  • Susceptibility
Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show
  • paramagnetism
  • anti-ferromagnetism
  • no magnetic property
  • diamagnetism
The magnetic susceptibility of paramagnetic materials is
  • positive, but very high
  • negative, but small
  • negative, but very high
  • positive, but small
If a magnetic substance is kept in a magnetic field then which of the following substances is thrown out?
  • Paramagnetic
  • Ferromagnetic
  • Diamagnetic
  • Anti-ferromagnetic
The magnetic force required to demagnetise the material is
  • retentivity
  • coercivity
  • energy loss
  • hysteresis
Susceptibility of ferromagnetic substance is
  • >1
  • <1
  • zero
  • 1
Permanent magnet has properties retentivity and coercivity respectively
  • high–high
  • low–low
  • low–high
  • high–low
Curie-Weiss law is obeyed by iron
  • only at Curie temperature
  • at all temperatures
  • below Curie temperature
  • above Curie temperature
The angle between the true geographic North and the North shown by a compass needle is called as
  • inclination
  • magnetic declination
  • angle of meridian
  • magnetic pole
The angle between magnetic meridian and geographical meridian is known as
  • magnetic dip
  • magnetic latitude
  • magnetic declination
  • magnetic longitude
Tangent galvanometer measures
  • capacitance
  • current
  • resistance
  • potential difference
The time period of a freely suspended bar magnet in a field is 2s. It is cut into two equal parts along its axis, then the time period is
  • 4s
  • 0.5s
  • 2s
  • 0.25s
A straight strip has magnetic moment M. If bent as a semicircle, the magnetic moment of the strip will be

  • Physics-Magnetism and Matter-77819.png
  • 2)
    Physics-Magnetism and Matter-77820.png

  • Physics-Magnetism and Matter-77821.png

  • Physics-Magnetism and Matter-77822.png
Rate of change of torque τ with deflection θ is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when
  • θ = 0°
  • θ = 45°
  • θ = 60°
  • θ = 90°
If the magnet is cut into four equal parts such that their lengths and breadths are equal. Pole strength of each part is
  • m
  • m/2
  • m/4
  • m/8
A current carrying small loop behaves like a small magnet. If A be its area and M its magnetic moment, the current in the loop will be
  • M / A
  • A / M
  • MA
  • AM2
The magnetism of a magnet is due to
  • the earth
  • cosmic rays
  • the spin motion of electrons
  • pressure of big magnet inside the earth
If a bar magnet of length l and cross-sectional area A is cut into two equal parts as shown in figure, then the pole strength of each pole becomes
Physics-Magnetism and Matter-77828.png
  • half
  • double
  • one-fourth
  • four times
A bar magnet is held at a right angles to a uniform magnetic field. The couple acting on the magnet is to be halved by rotating it from this position. The angle of rotation is
  • 60°
  • 45°
  • 30°
  • 75°
A magnetic needle is kept in a non-uniform magnetic field. It experiences
  • a torque but not a force
  • neither a force nor a torque
  • a force and a torque
  • a force but not a torque
Direction of magnetic field at equatorial point is
  • parallel to M
  • perpendicular to M
  • making an angle of 45° with M
  • anti-parallel to M
Consider a short magnetic dipole of magnetic length 10 cm. Its geometric length is
  • 12 cm
  • 8 cm
  • 10 cm
  • 14 cm
If a magnetic dipole of dipole moment M rotated through an angle θ with respect to the direction of the field H, then the work done is
  • MH sin θ
  • MH (1 –sin θ)
  • MH cos θ
  • MH (1 – cos θ)
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