MCQ4ALLCLASS

CURRENT ELECTRICITY

12th Physics ,Chapter-3 (  Current – Electricity )

 

(1) A charged particle has drift velocity 8.4 * 10 ^ – 4 * m * s ^ – 1 in electric fied of2.1 * 10 ^ – 10 Its mobility is:
a. 2.5 * 10 ^ 7 * m ^ 2 * V ^ – 1 * s ^ – 1
b. 4 * 10 ^ 6 * m ^ 2 * V ^ – 1 * s ^ – 1
c. 2.5 * 10 ^ – 7 * m ^ 2 * V ^ – 1 * s ^ – 1
d. 4 * 10 ^ – 6 * m ^ 2 * V ^ – 1 * s ^ – 1

b. 4 * 10 ^ 6 * m ^ 2 * V ^ – 1 * s ^ – 1

Answer

 

(2) Kirchhoff’s loop rule is a direct consequence of law of conservation of:
a. Charge
b. Momentum
c. Angular Momentum
d. Energy

d. Energy

Answer

 

(3) For a conductor, which of the following relation is correct:
a. vec J = sigma vec E
b. vec J = vec E sigma
c. vec J = sigma vec E
d. None of these

c. vec J = sigma vec E

Answer

 

(4) In current electricity, Ohm’s law is obeyed by all
a. Solids
b. Metals
c. Liquids
d. Gases

b. Metals

Answer

 

(5) The current of 3.2 A is flowing in a conductor. The number ofelectrons flowing per second will be
a. 2 * 10 ^ 9
b. 3 * 10 ^ 20
c. 5.2 * 10 ^ 19
d. 9 * 10 ^ 20

a. 2 * 10 ^ 9

Answer

 

(6) Wheatstone bridge is used to measure
a. High resistance
b. Low resistance
c. Both high and low resistance
d. Potential difference

b. Low resistance

Answer

 

(7) Pure water is a of electricity:
a. bad conductor
b. good conductor
c. Insulator
d. none

a. bad conductor

Answer

 

(8) What is the order of drift velocity of electrons :
a. 10 ^ – 2 * m / s
b. 10 ^ – 3 * m / s
c. 10 ^ – 5 * m / s
d. none

c. 10 ^ – 5 * m / s

Answer

 

(9) The number of electrons that constitute 1A of current are:
a. 6.25 * 10 ^ 16
b. 6.25 * 10 ^ 17
c. 6.25 * 10 ^ 18
d. 6.25 * 10 ^ 19

c. 6.25 * 10 ^ 18

Answer

 

(10) What is called continuous flow of
electrons :
a. Electric current
b. Resistance
c. Conductivity
d. None

a. Electric current

Answer

 

(11) Which instrument is used to measure electric current:
a. Voltmeter
b. Ammeter
c. Meter Bridge
d. None

b. Ammeter

Answer

 

(12) Electric current is scalar or vector :
a. vector
b. scalar
c. neither vector nor scalar
d. none

b. scalar

Answer

 

(13) What is produced, when electric current passes through a wire:
a. Heat
b. protons
c. photons
d. None

a. Heat

Answer

 

(14) What are the different methods for connecting resistance:
a. in series
b. in parallel
c. both (a) and (b)
d. none

c. both (a) and (b)

Answer

 

(15) What is the condition for applying Ohm’s law:
a. conductor at constant temperature
b. conductor at law temperature
c. conductor at high temperature
d. none of these

a. conductor at constant temperature

Answer

 

(16) In what way a Voltmeter is connected in a circuit?
a. parallel
b. series
c. any where
d. none

a. parallel

Answer

 

(17) Filament of bulb is made of which metal:
a. sodium
b. steel
c. tungsten
d. none

c. tungsten

Answer

 

(18) Two graphs are plotted between current (1) passing through a conductor and applied voltage (V) at two different temperature T_{1} & T_{2} We conclude that
a. T_{1} > T_{2}
b. T_{1} < T_{2}
c. T_{1} = T_{2}
d. T_{1} <= T_{2}

a. T_{1} > T_{2}

Answer

 

(19) A wire of resistance 12 is stretched to double its length. The resistance of the wire becomes:
a. 1 Ω
b. 1/4 * Omega
c. 20
d. 4 Ω

d. 4 Ω

Answer

 

(20) Ohm’s law is valid when the temperature of the conductor is :
a. very low
b. very high
c. varying
d. constant

d. constant

Answer

 

(21) The diameter of wire is doubled, its resistance will be:
a. half
b. doubled
c. for-times
d. one-fourth

d. one-fourth

Answer

 

(22) The unit of Electric current density is :
a. Am
b. A * m ^ 2
c. A * m ^ – 2
d. Am¹.

c. A * m ^ – 2

Answer

 

(23) Three resistances each of 3 ohms are connected to form atriangle, the resistance between any two terminals is
a. 1 Ω
b. 6 Ω
c. 2 Ω
d. 9 Ω

c. 2 Ω

Answer

 

(24) The resistance of an ideal voltmeter is :
a. zero
b. ΙΚ Ω
c. infinite
d. 500 Ω

c. infinite

Answer

 

(25) If a wire is stretched by a force, it
a. increased
b. decreases
c. remain constant
d. None

a. increased

Answer

 

(26) If temperature of a conductor increases, its conductivity :
a. increases
b. decreases
c. increases linearly
d. decreases linearly

d. decreases linearly

Answer

 

(27) The unit for electrical conductivity is :
a. mho
b. mho-mtr
c. mho-mtr
d ohm-mtr

c. mho-mtr

Answer

 

(28) Drift velocity of free electrons in a conductor does not depend upon its :
a. temperature
b. length
c. Area of cross-section
d. material con

d. material con

Answer

 

(29) What is the S. I. unit of resistivity:
a. Ohm.m
b. Ohm¹ m-1
c. Ohm
d. None

a. Ohm.m

Answer

 

(30) How resistance of a wire is affected by increasing its length:
a. resistance decreases
b. resistance increases
c. no effect
d. none

b. resistance increases

Answer

 

(31) A fuse wire is made of a wire of
a. low resistance and low melting point
b. high resistance and low melting point
c. low resistance and high melting point
d. high resistance and high melting point

a. low resistance and low melting point

Answer

 

(32) What is called the ratio of potential difference & current :
a. Resistance
b. Resistivity
c. Conduction
d. None

a. Resistance

Answer

 

(33) What is the S. I. unit of resistance :
a. Ohm
b. Ohm.m
c. Ohm-m-l
d. None

a. Ohm

Answer

 

(34) What is effect of increase in temperature on resistance of a conductor
a. resistance decreases
b. resistance increases
c. No effect
d. None

b. resistance increases

Answer

 

(35) Which one of the following is an anode in a dry cell:
a. zinc
b. carbon
c. copper
d. aluminium

b. carbon

Answer

(36) Which of the following cell can be recharged:
a. Voltaic cell
b. Daniel cell
c. fuel cell
d. dry cell

c. fuel cell

Answer

 

(37) A galvanometer can be converted into a voltmeter by connecting
a. a low resistance in series
b. a high resistance in parallel
c. a low resistance in parallel
d. a high resistance in series

d. a high resistance in series

Answer

1 thought on “CURRENT ELECTRICITY”

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