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WorksheetsCurrent Electricity - KCL, KVL, Wheatstone, Potentiometer
Total questions: 20
Worksheet time: 5hrs 0mins
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
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
Wheatstone is one type of ______ bridge
AC
DC
DAC
ADC
Equation for this circuit is :
R1R3 = R2Rx
R1R2 = R3Rx
R1Rx = R3R2
R1Rg = RxRg
Calculate R if P=1 kΩ, Q=2.5 kΩ and S=4kΩ
1.6 Ω
0.16 kΩ
16 kΩ
1.6 kΩ
- Kirchhoff's junction rule is a reflection of
Conservation of current density vector
Conservation of charge and no accumulation of charge at the the junction
the momentum with which a charged particle approaches a junction is unchanged as the charged particle leaves the junction
Conservation of energy
14. For measurement of potential difference, a potentiometer is preferred over voltmeter because
(a) potentiometer is more sensitive than voltmeter.
(b) the resistance of potentiometer is less than voltmeter.
(c) potentiometer is cheaper than voltmeter.
(d) potentiometer does not take current from the circuit.
15. From the graph between current I and voltage V shown below, identify the portion corresponding to negative resistance
(a) AB
(b) BC
(c) CD
(d) DE
16. Which of the following I-V graph represents ohmic conductors?
(a) A
(b) B
(c) C
(d) D
18. In a Wheatstone bridge if the battery and galvanometer are interchanged then the deflection in galvanometer will
(a) change in previous direction
(b) not change
(c) change in opposite direction
(d) none of these.
20. The figure below shows currents in a part of electric circuit. The current i is ________ .
(a) 2 A
(b) 1.3 A
(c) 1.7 A
(d) 1 A
An ideal voltmeter in physics has...
...an easily readable scale
...an infinite resistance
...zero resistance
...a negligible internal resistance
In Physics, an ideal ammeter has...
...a 10A fuse
...infinite resistance
...an autoranging function
...zero resistance
A car battery has an emf of 12V and an internal resistance of 0.005Ω. The terminal voltage when a load current of 100A is drawn is...
11.5V
0.5V
7.0V
11.5A
What is the reading of voltmeter when the switch is closed?
What is the value of the internal resistance?
What is emf?
the electro motive "force" or the force on electrons
the electromotive "force" or the Voltage of a cell measured when there is no current flowing
the electromotive "field" or the Voltage of a cell measured when there is no current
the electromotive "force" or Voltage of a cell measured when connected to a circuit
A potentiometer wire of length 1 m is connected to a driver cell of emf 3 V as shown in the figure. When a cell of 1×5 V emf is used in the secondary circuit, the balance point is found to be 60 cm. On replacing this cell and using a cell of unknown emf, the balance point shifts to 80 cm.Calculate unknown emf of the cell.
1 V
1.5 V
3 V
2 V
2.2 V
What happens to the balancing length if the value of the variable resistance R is increased?
decreases
increases
no change
can not predict
