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WorksheetsCurrent Electricity class XII
Total questions: 10
Worksheet time: 5mins
A Carbon Resistor is marked in colour bands of Red, Black,Orange,Silver.What is the resistance and tolerance value of the resistor ?
20 kilo ohm & +- 10%
18 kilo ohm & +-5%
25 kilo ohm & +- 10%
20 kilo ohm
Is current density a scalar or vector quantity ?
(a)
A cell of emf (E) and internal resistance (r) draws a current (I). Write a relation between terminal voltage (V) in terms of E,I,r. ?
(a)
Though we specify the direction of direct current by putting an arrow, why is it not considered a vector quantity ?
Because current does not obey the laws of vector addition
Because charge is Quantized
Because conventional direction of current is only virtual
Because current obeys Kirchhoff Laws
As the temperature of a conductor increases both it's Resistivity and Conductivity change.Will the ratio of its Resistivity and conductivity
Increases
Decreases
Remain same
None of these
When is the Wheatstone bridge is most sensitive ?
When all the four resistances of the bridge are equal
When the bridge is balanced
When high amount of current is flowing through the bridge
When a very low amount of current is flowing through the bridge
The unit of electric power is
Volt
Joule
kWh
Watt
Current carriers in Electrolyte are/is
Free electrons
Holes
Electrons and holes both
Positive and negative ions
What will be the new resistivity of a metallic wire if it's length becomes double
Increases two times
Becomes half
Increases four times
Remains same
SI unit of current density is (a)
