A glass rod when rubbed with silk cloth is charged because__________?
A. it takes in proton
B. its atoms are removed
C. it gives away electrons
D. it gives away positive charge
Which quantity should be measured by the voltmeter ?
A. Current
B. Voltage
C. Power
D. Speed
Voltmeter is a high resistance device used for measuring potential difference or voltage. It must be connected in parallel for measurement
A. 100 Ω
B. 200 Ω
C. 300 Ω
D. 400 Ω
The resistivity of the conductor depends on
A. area of the conductor.
B. length of the conductor.
C. type of material.
D. none of these.
The resistivity is a property of material, defined as the resistance between two opposite faces of a cube of a material of unit volume. That is why resistivity is only the unique property of material and it does not depend upon the dimension of any piece of material.
For which of the following ‘ampere second’ could be the unit ?
A. Reluctance
B. Charge
C. Power
D. Energy
The rating of a fuse wire is always expressed in________________?
A. ampere-hours
B. ampere-volts
C. kWh
D. amperes
Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following statement is correct ?
A. 100 W lamp will glow brighter
B. 40 W lamp will glow brighter
C. Both lamps will glow equally bright
D. 40 W lamp will fuse