Related Questions

Which is the longer: P is equal to Q, R is shorter than P, S is longer than R. T is longer than Q, is longer then S.
A T
B Q
C S
D P
Diamagnetic materials are magnetised
A Strongly
B Only slightly
C With eddy currents only
D In a direction opposite to that of the applied field
The transition temperature at which all the ferromagnetic materials become paramagnetic materials is termed as the 'Curie temperature'. Its value for cobalt is __________ °C.
A 768
B 1127
C 1359
D 1480
Heating of ferromagnetic materials to a temperature above Curie temperature makes it
A Insulator for heat & electricity transmission
B Ferritic
C Behave like paramagnetic materials
D Superconductor
If the resultant of two equal forces has the same magnitude as either of the forces, then the angle between the two forces is
A 30°
B 60°
C 90°
D 120°
Sam can mow a lawn in 20 min, while mark takes 10 min longer to longer to mow the same lawn. How long will they take to mow the lawn if they work together?
A 12 min
B 14 min
C 15 min
D more than 15 min
Which of the following is a ferromagnetic material?
A Tungsten
B Aluminium
C Copper
D Nickel
Which of the following is not a ferromagnetic material?
A Nickel
B Cobalt
C Aluminium
D Iron
The relative permeability of a ferromagnetic material is
A Less than one
B More than one
C More than 10
D More than 100 or 1000
In heating the ferromagnetic material by induction heating, heat is produced due to
A Induced current flow through the charge
B Hysteresis loss taking place below Curie temperature
C Due to hysteresis loss as well as eddy current loss taking place in the charge
D None of the above factors

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