Question : 30 electrons are flowing through a electric wire in a time of 3se(c) Then the amount of current flowing through the wire is
(a) 1.6 X 10-18A
(c) 4.8 X 10-19 A
(b) 9 X 10-18A
(d) 9 X 10-19 A
Question : A current of 0.5A is drawn by a filament of an electric bulb for 10 minutes. The amount of electric charge flowing through the bulb is
(a) 400C
(c) 300C
(b) 500C
(d) 600c
Question : Current flows through a wire only when there is ___________between the ends of the wire
(a) Potential difference
(c) Work is done in moving a charge
(b) Potential difference at one end is more than at the other end
(d) All of the above
Question : The SI unit of Potential difference is
(a) Volt
(b) JA-1s-1
(c) JC-1
(d) All of the above
Question : The symbol used for denoting battery in a circuit is
Ans : A
Question : The amount of work done in moving a charge of 2C across two points having a potential difference of 24 V is
(a) 50J
(c) 24 J
(b) 48J
(d) 54J
Question : The resistance of the wire when the length of the wire increases two times
(a) Becomes 2 times
(c) Becomes 3 times
(b) Becomes 6 times
(d) Becomes 4 times
Question : Resistance of the wire is given by
(a) R= V/I
(c) R= I/V
(b) R= IV
(d) R= I2V
Question : The resultant resistance when three resistances 2ohms, 4ohms, 5ohms , when connected in series is
(a) 12 ohms
(c) 11ohms
(b) 13 ohms
(d) 15 ohms
Question : Potential difference in a circuit in which components are connected in series
(a) Remains the same across each component
(b) Gets distributed equally
(c) Gets divided across each component
(d) Potential difference does not appear
Question : The resultant value of resistances each of value r ohms when connected in parallel is x, when these resistances are connected in series the resultant resistance is :
(a) nx
(b) n2x
(c) x/n
(d) x/n2
Question : Electric fuse is connected with:
(a) Live wire
(b) neutral wire
(c) earthing
(d) parallel to the line wire
Question : To determine the equivalent resistance of two resistors, when connected in series, the correct way of connecting ammeter and voltmeter in the circuit is
(a) Both ammeter and voltmeter in series
(c) ammeter in parallel and voltmeter in series
(b) Both ammeter and voltmeter in parallel
(d) ammeter in series and voltmeter in parallel
Question : While performing the experiment to study the dependence of current on potential difference ,if the circuit used to measure the current and voltage is kept in on position for a longer time ,then
(a) Voltmeter reading will change
(c) The resistor will get heated up changing the value of “R”
(b) Ammeter reading will change
(d) All of the above
Question : In a voltmeter there are 20 divisions between 0 to 0.5 the least count of voltmeter is
(a) 0.0020
(c) 0.050
(b) 0.025
(d) 0.250
Question : Student sets- up an electric circuit for the verification of Ohm’s law. He observes that voltmeter reading gets in reversed direction. The student should
(a) Get the voltmeter replaced
(b) decrease resistance with the help of rheostat
(c) Reverse connection of voltmeter
(d) Connect voltmeter in series
Question : A body gets positively charged by loosing :
(a) Neutrons
(b) Electrons
(c) Protons
(d) α -particles
Question : A sure test of electrification is :
(a) Attraction
(b) Repulsion
(c) Friction
(d) Induction
Question : What is not true for electric charge :
(a) Electric charge is scalar quantity
(b) Charge on a body may be + ve or – ve
(c) S.I. unit of charge is coulomb
(d) One coulomb is charge of one electron
Question : All the following statements are correct except :
(a) A body is said to be negatively charged when it has got excess of electrons.
(b) When a body is charged positively, some electrons escape from it.
(c) The presence of moisture in the air reduces its conductivity
(d) None of the above
Question : A neutral body has equal amount of :
(a) Both positive and negative charges
(b) Only positive charge
(c) Only negative charge
(d) No charge at all
Question : Law which gives force between two charges is :
(a) Ohm’s law
(b) Faraday’s Law
(c) Coulomb’s law
(d) None of these
Question : A charge Q1 exerts some force on a second charge Q2. If a 3rd charge Q3 is brought near then the force of Q1 exerted on Q2.
(a) Will increase
(b) Will decrease
(c) Will remain unchanged
(d) Will increase if Q3 is of the same sign as Q1 and will decrease if Q3 is of opposite sign.
Question : 5 C/S is same as :
(a) 5 A
(b) 5 mA
(c) 5 joule
(d) 5 volt
Question : Electric current is :
(a) flow of charge per unit time
(b) work done per unit time
(c) Resistance per unit time
(d) All of these
Question : The space around a charge in which some other charge experiences attraction or repulsion, is called its:
(a) Potential
(b) Electric field
(c) Electric field intensity
(d) Potential difference
Question : Work done in moving a unit positive test charge from one point to another inside an electric field, is called:
(a) Potential
(b) Field
(c) Field intensity
(d) Potential difference
Question : Electricity constituted by moving electric charges, is called :
(a) positive electricity
(b) negative electricity
(c) current electricity
(d) static electricity
Question : The condition for an electric charge to flow from one point to other is that the two points must have electric:
(a) Circuit (closed)
(b) Current
(c) Potential difference
(d) (a) & (c) both are correct
Question : Unit of potential difference is :
(a) Joule/Coulomb
(b) Volt
(c) Coulomb
(d) (a) and (b) are correct
Question : Substances whose atoms have more free electrons are called :
(a) Conductors
(b) Insulators
(c) Electrolytes
(d) Semi-conductors
Question : Electron volt is a measure of :
(a) charge
(b) current
(c) electric potential
(d) energy
Question : Read the following statements :
Y : The resistivity of a semiconductor decreases with rise in temperature.
Z : In a conducting solid, the rate of collisions between free electrons and ions increases with rise in temperature.
(a) Y is true but Z is false
(b) Y is false but Z is true
(c) Both Y and Z are true
(d) Y is true but Z is the correct reason for Y.
Question : Commercial unit of electrical energy is :
(a) Calorie
(b) Joule
(c) Kilowatt hour
(d) All of these
Question : A 2 KW boiler used for 1 hour everyday consumes the following electrical energy in thirty days :
(a) 60 units
(b) 120 units
(c) 15 units
(d) None of these
Question : Two heater wires of same length and material but of different thickness are connected in series across a power supply. The power dissipated :
(a) Will be same in both
(b) Will be more in thinner wire
(c) Will be more in thicker wire
(d) Cannot be predicted
Question : Watt hour is also called :
(a) volt-ampere hour (VAH)
(b) Board of trade unit
(c) Horse power
(d) None of these
Question : Which is correct for electric power :
(a) P = V/I
(b) P = I2R
(c) P = I2 / R
(d) P = V2R
Question : Two 1000 W heaters when connected in parallel across 220 V supply produced heat Qp in time t. If they are connected in series across the same power supply the heat produced in the same time is Qs. What is Qp/Qs ?
(a) 4
(b) 2
(c) 0.5
(d) 0.25
Question : The slope of voltage (V) versus current (I) curve is called :
(a) Resistance
(b) Conductance
(c) Resistivity
(d) Conductivity
Question : In parallel combination, the effective resistance of the circuit :
(a) Decreases
(b) Increases
(c) May decrease or increase
(d) No particular observation
Answer: D
