154364
When a ferromagnetic material is heated to temperature above its curie point, the material:
1 is permanently magnetized
2 remains ferromagnetic
3 behaves like a diamagnetic material
4 behaves like a paramagnetic material
Explanation:
D When a ferromagnetic material is heated above the Currie point, its domain gets disturbed a little bit and hence the direction of the domain no longer remains aligned towards the magnetic field resulting in decreased attraction. Thus, we can say that ferromagnetic material gets converted to paramagnetic material if heated above Currie point.
UPSEE - 2005
Magnetism and Matter
154367
Identify the correctly matched pair Material $\text { Example }$
1 Diamagnetic - $\quad$ Gadolinium
2 Soft ferromagnetic - Alnico
3 Hard ferromagnetic - Copper
4 Paramagnetic - $\quad$ Sodium
5 Permanent magnet - Aluminium
Explanation:
D Sodium falls into the category of being paramagnetic, meaning it retains no magnetism itself. Paramagnetic substances are those substances that get weakly magnetized in the presence of an external magnetic field. Example- Sodium, Aluminum, Platinum etc.
Kerala CEE- 2014
Magnetism and Matter
154369
The graph between resistivity and temperature, for a limited range of temperatures, is a straight line for a material like
1 copper
2 nichrome
3 silicon
4 mercury
5 gallium arsenide
Explanation:
B Nichrome is an alloy that conducts electricity although it has high resistivity, due to this property it is used for making heating elements of electrical appliances. Even at $0 \mathrm{~K}$ temperature the specific resistivity of Nichrome is very high and it varies linearly with increase in temperature. It has a high specific resistivity due to which it opposes the flow of current and hence it has a high resistance too.
Kerala CEE - 2010
Magnetism and Matter
154376
The correct definition of Meissner effect is
1 The phenomenon of perfect paramagnetism in superconductors
2 The phenomenon of perfect diamagnetism in superconductors
3 The phenomenon of perfect diamagnetism in semiconductors
4 The phenomenon of ferromagnetism in metals
Explanation:
B Meissner effect is the effect that converts a material from a normal state to a super conducting state. When a material is called below a specified temperature at which the magnetic field from the interior of the material is exploded, and this material is transformed into the superconductor. This phenomenon is called the Meissner effect.
154364
When a ferromagnetic material is heated to temperature above its curie point, the material:
1 is permanently magnetized
2 remains ferromagnetic
3 behaves like a diamagnetic material
4 behaves like a paramagnetic material
Explanation:
D When a ferromagnetic material is heated above the Currie point, its domain gets disturbed a little bit and hence the direction of the domain no longer remains aligned towards the magnetic field resulting in decreased attraction. Thus, we can say that ferromagnetic material gets converted to paramagnetic material if heated above Currie point.
UPSEE - 2005
Magnetism and Matter
154367
Identify the correctly matched pair Material $\text { Example }$
1 Diamagnetic - $\quad$ Gadolinium
2 Soft ferromagnetic - Alnico
3 Hard ferromagnetic - Copper
4 Paramagnetic - $\quad$ Sodium
5 Permanent magnet - Aluminium
Explanation:
D Sodium falls into the category of being paramagnetic, meaning it retains no magnetism itself. Paramagnetic substances are those substances that get weakly magnetized in the presence of an external magnetic field. Example- Sodium, Aluminum, Platinum etc.
Kerala CEE- 2014
Magnetism and Matter
154369
The graph between resistivity and temperature, for a limited range of temperatures, is a straight line for a material like
1 copper
2 nichrome
3 silicon
4 mercury
5 gallium arsenide
Explanation:
B Nichrome is an alloy that conducts electricity although it has high resistivity, due to this property it is used for making heating elements of electrical appliances. Even at $0 \mathrm{~K}$ temperature the specific resistivity of Nichrome is very high and it varies linearly with increase in temperature. It has a high specific resistivity due to which it opposes the flow of current and hence it has a high resistance too.
Kerala CEE - 2010
Magnetism and Matter
154376
The correct definition of Meissner effect is
1 The phenomenon of perfect paramagnetism in superconductors
2 The phenomenon of perfect diamagnetism in superconductors
3 The phenomenon of perfect diamagnetism in semiconductors
4 The phenomenon of ferromagnetism in metals
Explanation:
B Meissner effect is the effect that converts a material from a normal state to a super conducting state. When a material is called below a specified temperature at which the magnetic field from the interior of the material is exploded, and this material is transformed into the superconductor. This phenomenon is called the Meissner effect.
154364
When a ferromagnetic material is heated to temperature above its curie point, the material:
1 is permanently magnetized
2 remains ferromagnetic
3 behaves like a diamagnetic material
4 behaves like a paramagnetic material
Explanation:
D When a ferromagnetic material is heated above the Currie point, its domain gets disturbed a little bit and hence the direction of the domain no longer remains aligned towards the magnetic field resulting in decreased attraction. Thus, we can say that ferromagnetic material gets converted to paramagnetic material if heated above Currie point.
UPSEE - 2005
Magnetism and Matter
154367
Identify the correctly matched pair Material $\text { Example }$
1 Diamagnetic - $\quad$ Gadolinium
2 Soft ferromagnetic - Alnico
3 Hard ferromagnetic - Copper
4 Paramagnetic - $\quad$ Sodium
5 Permanent magnet - Aluminium
Explanation:
D Sodium falls into the category of being paramagnetic, meaning it retains no magnetism itself. Paramagnetic substances are those substances that get weakly magnetized in the presence of an external magnetic field. Example- Sodium, Aluminum, Platinum etc.
Kerala CEE- 2014
Magnetism and Matter
154369
The graph between resistivity and temperature, for a limited range of temperatures, is a straight line for a material like
1 copper
2 nichrome
3 silicon
4 mercury
5 gallium arsenide
Explanation:
B Nichrome is an alloy that conducts electricity although it has high resistivity, due to this property it is used for making heating elements of electrical appliances. Even at $0 \mathrm{~K}$ temperature the specific resistivity of Nichrome is very high and it varies linearly with increase in temperature. It has a high specific resistivity due to which it opposes the flow of current and hence it has a high resistance too.
Kerala CEE - 2010
Magnetism and Matter
154376
The correct definition of Meissner effect is
1 The phenomenon of perfect paramagnetism in superconductors
2 The phenomenon of perfect diamagnetism in superconductors
3 The phenomenon of perfect diamagnetism in semiconductors
4 The phenomenon of ferromagnetism in metals
Explanation:
B Meissner effect is the effect that converts a material from a normal state to a super conducting state. When a material is called below a specified temperature at which the magnetic field from the interior of the material is exploded, and this material is transformed into the superconductor. This phenomenon is called the Meissner effect.
154364
When a ferromagnetic material is heated to temperature above its curie point, the material:
1 is permanently magnetized
2 remains ferromagnetic
3 behaves like a diamagnetic material
4 behaves like a paramagnetic material
Explanation:
D When a ferromagnetic material is heated above the Currie point, its domain gets disturbed a little bit and hence the direction of the domain no longer remains aligned towards the magnetic field resulting in decreased attraction. Thus, we can say that ferromagnetic material gets converted to paramagnetic material if heated above Currie point.
UPSEE - 2005
Magnetism and Matter
154367
Identify the correctly matched pair Material $\text { Example }$
1 Diamagnetic - $\quad$ Gadolinium
2 Soft ferromagnetic - Alnico
3 Hard ferromagnetic - Copper
4 Paramagnetic - $\quad$ Sodium
5 Permanent magnet - Aluminium
Explanation:
D Sodium falls into the category of being paramagnetic, meaning it retains no magnetism itself. Paramagnetic substances are those substances that get weakly magnetized in the presence of an external magnetic field. Example- Sodium, Aluminum, Platinum etc.
Kerala CEE- 2014
Magnetism and Matter
154369
The graph between resistivity and temperature, for a limited range of temperatures, is a straight line for a material like
1 copper
2 nichrome
3 silicon
4 mercury
5 gallium arsenide
Explanation:
B Nichrome is an alloy that conducts electricity although it has high resistivity, due to this property it is used for making heating elements of electrical appliances. Even at $0 \mathrm{~K}$ temperature the specific resistivity of Nichrome is very high and it varies linearly with increase in temperature. It has a high specific resistivity due to which it opposes the flow of current and hence it has a high resistance too.
Kerala CEE - 2010
Magnetism and Matter
154376
The correct definition of Meissner effect is
1 The phenomenon of perfect paramagnetism in superconductors
2 The phenomenon of perfect diamagnetism in superconductors
3 The phenomenon of perfect diamagnetism in semiconductors
4 The phenomenon of ferromagnetism in metals
Explanation:
B Meissner effect is the effect that converts a material from a normal state to a super conducting state. When a material is called below a specified temperature at which the magnetic field from the interior of the material is exploded, and this material is transformed into the superconductor. This phenomenon is called the Meissner effect.
