For testing appliances the wattage of test lamp should be
high
very low
low
any value
high
Switching of a lamp in house produces noise in the radio. This is because switching operation produces
none of the above
both mechanical noise and arc between contacts
mechanical noise of high intensity
arcs across separating contacts
arcs across separating contacts
Sparking occurs when a load is switched off because the circuit has high
resistance
capacitance
inductance
impedance
inductance
Copper wire of certain length and resistance is drawn out to three times its length without change in volume the new resistance of wire becomes
9 times
unchanged
3 times
1/9 times
9 times
When resistance element of a heater fuses and then we reconnect it after removing a portion of it the power of the heater will
increase
remain constant
decrease
none of the above
increase
A field of force can exist only between
two metal particles
two ions
two molecules
two atoms
two ions
A substance whose molecules consist of dissimilar atoms is called
compound
semi-conductor
super-conductor
insulator
compound
International ohm is defined in terms of the resistance of
the unit length of wire
a cube of copper
a cube of carbon
a column of mercury
a column of mercury
Three identical resistors are first connected in parallel and then in series. The resultant resistance of the first combination to the second will be
9 times
1/3 times
1/9 times
3 times
1/9 times
Which method can be used for absolute measurement of resistances ?
Wheatstone bridge method
Ohms law method
Releigh method
Lorentz method
Wheatstone bridge method
पोस्ट अच्छी लगी हो तो प्लीज नीचे दिए गए लिंक पर क्लिक कर शेयर जरुर करें
0 Comments