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WorksheetsTEST CURRENT ELECTRICITY CHAPTER 3
Total questions: 16
Worksheet time: 8mins
- 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
Which of the following characteristics of electrons determines the current in a conductor?
Drift velocity alone
Thermal velocity alone
Both A and B
Neither A nor B
------ is called the increase in resistance per unit original resistance per degree kelvin rise of temperature
Thermal velocity
temperature coefficient of electrical resistivity
temperature coefficient of electrical resistance
conducance
13. Drift velocity vd varies with the intensity of electric field as per the relation
(a) vd ∝ E
(b) vd ∝ 1/E
(c) vd = constant
(d) vd ∝ E²
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
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.
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.
19. n a potentiometer of 10 wires, the balance point is obtained on the 7th wire. To shift the balance point to 9th wire, we should
(a) decrease resistance in the main circuit.
(b) increase resistance in the main circuit.
(c) decrease resistance in series with the cell whose emf is to be measured.
(d) increase resistance in series with the cell whose emf is to be determined.
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
When 2 resistances P and Q are kept in the left and right gaps of a meter bridge, the null point is obtained at 60 cm. If P is shunted by a resistance equal to half of its value, the shift in null point is
10 cm to the left
10cm to the right
26.7 cm to the left
26.7 cm to right
The potential difference between the terminals of a battery is 10V and internal resistance 1 Ω drops to 8V when connected across an external resistor find the resistance of the external resistor.
40 ohm
0.4 ohm
4M ohm
4 ohm
In Meter Bridge when P is kept in left gap, Q is kept in right gap, the balancing length is 40cm. If Q is shunted by 10, the balance point shifts by 10cm. Resistance Q is____________
8 ohm
5 ohm
10 ohm
6 ohm
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
The internal resistance of a cell is the resistance of
Material used in the cell
Electrolyte used in the cell
Electrodes of the cell
vessel of the cell
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
