OMTEX CLASSES: The Electric Spark

The Electric Spark

__________ is a flow of electrons in a conductor or amount of charge flowing through
a particular cross-sectional area in unit time
True or False: Free Electrons move Randomly in all directions in a conductor with
no potential difference
Name the following: A continuous path consisting of conducting wires and other resistances
between terminals pf a battery, along which an electric current flows.
Fill in the Blank: If one coulomb (C) of charge is passing through any cross-section
of a conductor in one second (s), then the amount of current flowing through it
is ______________
True or False: Electric Potential is the electric level at a particular point. The
current will flow, if there is potential difference
The_________ between two points in an electric field is defined as the amount of
work done in moving a unit positive charge from one point to another.
(a) Charge
(b) Potential Difference
(c) Resistance
(d) Capacitance
True or False: (1 J) = (1 V) x (1 C)
The potential difference between two points is said to be_____, if 1 Joule of work
is done in moving 1 Coulomb of electric charge from one point to another
(a) 1 milliVolt
(b) 1 megaVolt
(c) 1 kiloVolt
(d) 1 Volt
Name the following: Electric Discharge which moves from Sky (about 10,000,000 Volts)
to Ground at Zero Potential
True or False: The direction of electric current is considered opposite to the directions
of electron flow
Charge of an electron (e) = _____ C
(a) 1.6 x 10-11
(b) 3.2 x 10-19
(c) 1.9 x 10-16
(d) 1.6 x 10-19
The property of the conductor due to which it opposes flow of current is called
(a) Resistance
(b) Impedance
(c) Inductance
(d) Capacitance
1 Volt = ________
(a) 1 milliVolt
(b) 1000 milliVolt
(c) 0.1 kiloVolt
(d) 1 microVolt
Ohm’s Law can mathematically be stated as: (Symbols have their usual meanings)
(a) C = I x A
(b) A = I x V
(c) R = I x C
(d) V = I x R
Fill in the Blank: ________________ of a conductor is defined as the resistance
of a conductor of unit length and unit cross-sectional area
Name the following: A diagram which indicates how different components in a circuit
have been connected by using the electrical symbols for the components.
If 2 Ampere current flows through the conductor when 15 Volt potential difference
is applied across it, the its resistance is ____ Ohm
(a) 30
(b) 5
(c) 7.5
(d) 1
True or False: Resistivity depends on the geometry of the conductor metal
1 Ampere = ________
(a) 100 milliAmp
(b) 1000 milliAmp
(c) 0.01 kiloAmp
(d) 100 microAmp
True or False: SI unit of Resistivity is ohm-metre (O-m)
Effective Resistance of resistors in Parallel is ________ of all resistors
(a) Less than Maximum
(b) Less than Least
(c) More than Maximum
(d) More than Least
The quantity of heat (H) generated in a conductor of Resistance (R), when a current
(I) flows through it for the time (t), depends on
(a) Current (I)
(b) Resistance of conductor (R)
(c) Time for which current flows (t)
(d) All of the above
Name the following: A piece of wire, made of alloy of low melting point (like lead
& tin), which if current exceed the rated value (1A, 2A, 3A, 4A, 5A or 10A), the
temperature melts the wire and circuit is broken
True or False: For resistors in Parallel, total voltage drop across all resistors
is equal to sum of voltage drops across each resistors
True or False: Resistivity of iron is more than that of Silver
Resistivity of Ebonite is ______ (O-m)
(a) 10-8 to 10-6
(b) 103 to 105
(c) 107 to 108
(d) 1015 to 1017
Effective Resistance of resistors in Series is ________ of all resistors
(a) Less than Maximum
(b) Less than Minimum
(c) More than Maximum
(d) More than Minimum
Find Odd one out: Bulb Filament
Fuse in electric circuit
Electric Iron
Fill in the Blank: ___________ is defined as the rate at which electrical energy
is consumed
True or False: For resistors in Parallel, sum of reciprocals of all resistances
is equal to reciprocal of Effective resistance

01. Electric Current
02. True
03. Circuit
04. 1 Ampere (A)
05. True
06. (b) Potential Difference
07. True
08. (d) 1 Volt
09. Lightening
10. True
11. (d) 1.6 x 10-19
12. (a) Resistance
13. (b) 1000 milliVolt
14. (d) V = I x R
15. Resistivity
16. Circuit Diagram
17. (c) 7.5
18. False { Resistivity is the characteristic property of a material }
19. (b) 1000 milliAmp
20. True
21. (b) Less than Least
22. (d) All of the above
23. Fuse
24. False { This is true for Series }
25. True
26. (d) 1015 to 1017
27. (c) More than Maximum
28. Speaker { Rest all are appliances based on heating effect of electric current}
29. Electric Power
30. True