CBSE Questions for Class 10 Physics Electricity Quiz 1 - MCQExams.com

When resistors with different resistances are connected in series, which of the following must be the same for each resistor? Choose all correct answers
  • potential difference
  • current
  • power delivered
  • charge entering each resistor in a given time interval
  • none of those answers
$$\displaystyle \frac { Charge }{ Time } =....$$
  • Voltage
  • Current
  • Potential
  • Work done
The rating of an electrical appliance is $$60 W$$, $$220 V$$. What is the safe limit of current in it, while in use ?
  • $$0.20 A$$
  • $$0.27 A$$
  • $$0.50 A$$
  • $$1.2 A$$
When does two elements are said to be in series?
  • When same current physically flows through both elements
  • When different current physically flows through both elements
  • When no current physically flows through both elements
  • None of these
What is the power produced by an appliance marked " $$240 V$$, $$2 A"?$$
  • $$8.3\ W$$
  • $$60\ W$$
  • $$120\ W$$
  • $$480\ W$$
Substances that do not allow free flow of charge through them are called __________.
  • Insulators
  • Conductors
  • Both A and B
  • None of these
A rod of a certain metal is $$1.0\ m$$ long and $$0.6\ cm$$ in diameter. Its resistance is $$3.0\times 10^{-3}\Omega$$. Another disc made of the same metal is $$2.0\ cm$$ in diameter and $$1.0\ mm$$ thick. What is the resistance between the round faces of the disc?
  • $$1.35\times 10^{-8}\Omega$$
  • $$2.70\times 10^{-7}\Omega$$
  • $$4.05\times 10^{-6}\Omega$$
  • $$8.10\times 10^{-5}\Omega$$
On a bulb is written 220 Volt and 60 watt. Find out the resistance of the bulb and the value of the current flowing through it. 
  • 806.66 ohm 0.27 ampere
  • 500 ohm 12 ampere
  • 200 ohm 14 ampere
  • 100 ohm 11 ampere
In the circuit shown in figure, the current flowing through $$ 5 \, \Omega $$ resistance is 
318902.png
  • $$0.5 \, A$$
  • $$0.6 \, A$$
  • $$0.9 \, A$$
  • $$1.5 \, A$$
An electric iron draws a current of 15 A from a 220 V supply, What is the cost of using iron for 30 min everyday for 15 days if the cost of unit (1 unit =1 kWhr) is 2 rupees ? 
  • Rs 49.5
  • Rs 60
  • Rs 40
  • Rs 10
A $$24 \ V$$ potential difference is applied across a parallel combination of four $$6 \ \Omega$$ resistor. The current in each resistor is:
  • $$1 \ A$$
  • $$4 \ A$$
  • $$16 \ A$$
  • $$36 \ A$$
Electric current is to be passed from one body to another. For this purpose the two bodies must be joined by
  • cotton thread
  • plastic string
  • copper wire
  • rubber band
In a metallic conductor, electric current is thought to be due to the movement of:
  • ions
  • amperes
  • electrons
  • protons
The flow of the electric current through a metallic conductor is:
  • Only due to electrons
  • Only due to +ve charges
  • Due to both nuclei and electrons.
  • Can not be predicted.
An electric bulb works on $$230\ V$$ line and draws $$0.1\ A$$ current. The resistance of the filament is:
  • $$230\ \Omega $$
  • $$2300\ \Omega $$
  • $$23\ \Omega $$
  • $$2.3\ \Omega $$
Which of the following option has no effect on an electric fuse wire?
  • Its specific resistance
  • Its radius
  • Its colour
  • Current flowing through it
Four identical wires each having resistance $$R$$ are connected as shown in the figure. Equivalent resistance between A and B is:

11428_4f991fc156ba41439c6511c117383aa6.png
  • $$\dfrac{R}{4}$$
  • $$\dfrac{R}{2}$$
  • $$4R$$
  • $$R$$
When we pay for our electricity bill, we are paying for the:
  • charge used.
  • current used.
  • power used.
  • energy used.
Which one of the following is not the unit of energy?
  • joule
  • newton metre
  • kilowatt
  • kilowatt hour
The electric current passing through a metallic wire produces heating because of:
  • collisions of conduction electrons with each other
  • collisions of the atoms of the metal with each other
  • the energy released in the ionisation of the atom of the metal
  • collisions of the conduction electrons with the atoms of the metallic wire
If doubling the voltage across a resistor doubles the current through the resistor then
  • the resistor value decreased.
  • the resistor value increased.
  • the resistor value did not change.
  • it is impossible to determine the change in the resistor value.
When the potential difference between two points is 1 volt and current through it is 1 A, then the resistance between the points is:
  • $$3 \, \Omega$$
  • $$2 \, \Omega$$
  • $$0.5 \, \Omega$$
  • $$1 \, \Omega$$
What is the relation between resistance R and resistivity $$\rho$$ of a wire ?
  • $$R=\dfrac{\rho A}{l}$$
  • $$R=\dfrac{\rho l}{A}$$
  • $$R=\dfrac{A}{\rho l}$$
  • $$R=\dfrac{l}{\rho A}$$
Electrical charge can be transferred from a charged object to another through :
  • Vacuum
  • Air
  • Insulators
  • Conductors
Name the material used for making the connection wires.
  • tin
  • copper
  • lead
  • tungsten
The commercial unit of electric energy is $$kilowatt-hour\ (kW h)$$, commonly known as:
  • $$Unit$$
  • $$Faraday$$
  • $$Curie$$
  • None of these
Fill in the blank-
An electric fuse works on the ______effect of current.
  • heating
  • magnetic
  • chemical
  • none of these
A fuse wire is generally made of
  • tin
  • tin-lead alloy
  • copper
  • either (a) or (b) above
A charged conductor has charge on its
  • outside surface
  • surrounding
  • middle point
  • inner surface
In series combination of resistances:
  • p.d. is same across each resistance.
  • total resistance is reduced
  • current is same in each resistance
  • all above are true.
State whether true or false:
Electric charges leak rapidly from the painted edges of a conductor.
  • True
  • False
Which is the equivalent resistance when resistors $$3 \Omega$$ and $$6 \Omega$$ are in parallel ?
  • $$9\, \Omega$$
  • $$3\, \Omega$$
  • $$2\, \Omega$$
  • $$6\, \Omega$$
Copper metal is a:
  • good conductor of electricity
  • bad conductor of electricity
  • magnetic substance
  • bad conductor of heat
  • none of these
Why is the fuse wire fitted in a porcelain casing ? 
  • Porcelian is an insulator of electricity
  • Porcelian is a conductor of electricity
  • Porcelian is a semiconductor of electricity
  • None of these.
State True or False :
The materials, which do not allow electric current to pass through them easily, are poor conductors of electricity.
  • True
  • False
Which of the following is a conductor?
  • glass
  • tungsten
  • wood
  • plastic
Name the materials which are used for making the standard resistor.
  • Chromium
  • Copper
  • Nickel
  • Tungsten
Equivalent resistances is less than either of the two resistances when they are in
  • series
  • Parallel
  • Parallel and series
  • none of these.
1 kilowatt hour $$=$$ ___________ .
  • $$10.6 \times 10^6$$Joule
  • $$3.6 \times 10^6$$Joule
  • $$30.6 \times 10^6$$Joule
  • $$3.6 \times 10^5$$Joule
The current which is assumed to be flowing in a circuit from positive terminal to negative, is called:
  • direct current
  • pulsating current
  • conventional current
  • alternating current
A dynamo develops $$0.5 A$$ at $$6 V$$. The energy which is generated in one second is
  • $$0.083 J$$
  • $$3 J$$
  • $$12 J$$
  • none of these
The device used for producing current is called a _____.
  • Voltmeter
  • Ammeter
  • Galvanometer
  • Generator
The insulator of electricity is :
  • copper
  • silk
  • human body
  • acidulated water
An electric lamp is marked $$60\ W,\ 220\ V$$. The cost of kilo watt hour of electricity is $$Rs.\ 1.25$$. The cost of using thing lamp on $$220\ V$$ for $$8\ hrs$$ is:
  • $$Rs.\ 0.25$$
  • $$Rs.\ 0.60$$
  • $$Rs.\ 1.2$$
  • $$Rs.\ 4.00$$
What is the resistance of a wire if its length is doubled, 
  • becomes twice
  • becomes thrice
  • remains same
  • becomes half
Fill in the blank.
Connecting wires in a electric circuit are made of .......
  • copper
  • silicon
  • tin
  • lead
The conventional direction of flow of current is
  • negative terminal to positive terminal of the cell.
  • positive terminal to negative terminal of the cell.
  • opposite direction of electrons
  • in direction of electrons.
The unit of current is :
  • ampere
  • volt
  • ohm
  • coulomb
The smallest resistance that can be obtained by the combination of  $$n$$ resistors, each of resistance  $$R$$ is:
  • $$n^2R$$
  • $$nR$$
  • $$\dfrac{R}{n^2}$$
  • $$\dfrac{R}{n}$$
Which of the follwing does not belong to the group formed by the others?
  • Iron
  • Tin
  • Glass
  • Steel
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