Which of the following materials has a negative temperature co-efficient of resistance?
Which of the following materials has a negative temperature co-efficient of resistance?
A. Copper
B. Aluminum
C. Carbon
D. Brass
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When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?
When resistance element of a heater fuses and then we reconnect it after removing a portion of it, the power of the heater will___________?
A. decrease
B. increase
C. remain constant
D. none of the aboveA field of force can exist only between_____________?
A field of force can exist only between_____________?
A. two molecules
B. two ions
C. two atoms
D. two metal particlesWhich of the following has no units?
Which of the following has no units?
A. Permeability
B. Moment of a magnet
C. Magnetic susceptibility
D PermittivityMagnetic susceptibility is the degree to which a material is magnetized by an external magnetic field, hence in the SI system it is dimensionless.
A resistance having rating 10 ohms, 10 W is likely to be a__________?
A resistance having rating 10 ohms, 10 W is likely to be a__________?
A. metallic resistor
B. carbon resistor
C. wire wound resistor
D. variable resistorThe hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?
The hot resistance of the bulb’s filament is higher than its cold resistance because the temperature co-efficient of the filament is___________________?
A. zero
B. negative
C. positive
D. about 2 ohms per degreeAn instrument which detects electric current is known as_____________?
An instrument which detects electric current is known as_____________?
A. voltmeter
B. rheostat
C. wattmeter
D. galvanometer