CBSE Questions for Class 10 Physics Electricity Quiz 2 - MCQExams.com

An electric heater is rated $$1500 \ W$$. How much energy does it use in $$10 \ hours$$ ?

  • $$25 \: kWh$$
  • $$10 \: kWh$$
  • $$15 \: kWh$$
  • $$12 \: kWh$$
Electricians wear rubber gloves because:
  • it is soft
  • it is water proof
  • it is an insulator
  • it is inexpensive
Which is/are the  insulators ?
  • wax
  • silver
  • ebonite
  • gold
A material that lets electricity to pass through it is called a/an:
  • electrical conductor
  • electrical insulator
  • electrical appliance
  • key
An electric heater converts electrical energy into:
  • chemical energy
  • heat energy
  • muscular energy
  • none of the above
Which of the following does not belong to the group formed by the others?
  • Copper coin
  • Steel spoon
  • Wooden ruler
  • Iron nail
When a 1 ohm resistor is connected across the potential difference of 20 V, what will be power dissipation in it?
  • $$200 W$$
  • $$20 W$$
  • $$400 W$$
  • $$10 W$$
Find the energy in $$kWh$$ consumed in $$10$$ hours by four devices of power $$500\ W$$ each.
  • $$30 \:kWh$$
  • $$25 \:kWh$$
  • $$20 \:kWh$$
  • $$35 \:kWh$$
A material that does not allow electricity to flow through it is called a/an:
  • Electrical conductor
  • Electrical insulator
  • Electrical appliance
  • Key
Metals are good conductors because:
  • outer electrons are strongly bound to the atom
  • outer electrons are loosely bound to the atom
  • inner electrons are loosely bound to the atom
  • protons can detach from the nucleus and conduct electricity
Electric current flows through:
  • a conductor
  • an insulator
  • free space
  • none of these
Insulators:
  • Conduct electricity
  • Do not conduct electricity
  • Conduct electricity only at low temperatures
  • Conduct electricity at room temperature
Consider a circuit which contains a resistance free battery and a single resistance $$R$$ . If a second resistance is added in parallel with $$R$$ .
  • The voltage across $$R$$ will decrease
  • The current through $$R$$ will increase
  • The total current drawn from the battery will increases
  • The power dissipated in $$R$$ will decrease current drawn from battery will increase
A body which cannot conduct electricity is
  • an insulator
  • a conductor
  • can be an insulator or conductor
  • none of these
When electric current is flown through a conductor, some amount of:
  • electrical energy is converted into heat energy.
  • electrical energy is converted into mechanical energy.
  • mechanical energy is converted into. electrical energy.
  • heat energy is converted into electrical energy.
When 1 coulomb of charge flows through a conductor in 1 sec, then the current passing through the conductor is?
  • 1Hp
  • 1A
  • 1C
  • 1P
In a cell, electrons move from:
  • positive electrode to negative electrode.
  • negative electrode to positive electrode.
  • both A and B.
  • electrons do not move and only negative charge moves from one place to another place.
If the resistance of a circuit is halved and the potential difference is kept constant, then the current will become
  • 4 times
  • 8 times
  • double
  • half
A current of 300 mA is made to flow through a 6k$$\Omega$$ resistor. What is the potential difference across the resistor?
  • 1800V
  • 50V
  • 0.02V
  • 500V
An electrical appliance has a resistance of 4 ohms. When it is connected to a 12 V battery, the number of coulombs passing through it per second is
  • 1.2
  • 12
  • 0.3
  • 3
A 4$$\Omega $$ (or 4 ohm) wire and a 2 $$\Omega $$ (or 2 ohm)wire are connected in parallel. A current of 3A passes through the wires. How much current passes through the 2 $$\Omega $$ (or 2 ohm) wire?
  • 2A
  • 4A
  • 6A
  • 8A
The potential difference across a $$6\Omega$$ resistor is $$12V$$. The current flowing in the resistor will be
  • 4A
  • 2A
  • 0.5A
  • 1A
A radio-set of resistance 20 $$\Omega$$and a resistor of 4 $$\Omega$$ are connected in series with a 6V battery. What is the potential difference across the radio-set?
  • 24V
  • 120V
  • 80V
  • 5V
The potential difference between the terminals of an electric heater is 220 V and the current is 5A. What is the resistance of the heater?
  • 22 ohm
  • 11 ohm
  • 44 ohm
  • 1100 ohm
Two resistors of $$30 \Omega$$ and $$20 \Omega$$ are joined together in series and then placed in parallel with a $$50 \Omega$$ resistor. What is the effective resistance of the combination?
  • $$25 \Omega$$
  • $$50 \Omega$$
  • $$5 \Omega$$
  • $$10 \Omega$$
If the current passing through an electric bell is doubled, the heat produced will become
  • four times
  • double
  • one-fourth
  • half
Which one of the following substances has infinitely high electrical resistance?
  • conductor
  • insulator
  • super conductor
  • resistor
What is the effective resistance between points A and B?
391768_3299b1521a9e405592130f40ece1b28b.png
  • $$\dfrac {R}{3}$$
  • $$\dfrac {4R}{3}$$
  • $$\dfrac {2R}{3}$$
  • $$\dfrac {R}{2}$$
The amount of heat produced in a wire depends on its material-
  • Length
  • Thickness
  • Length and thickness
  • None of these
Electric current is a ________.
  • Scalar quantity
  • Vector quantity
  • Vector quantity when it is due to the flow of positive charges
  • Vector quantity when it is due to electrons
The current carriers can have:
  • Positive charge only
  • Negative charge only
  • Positive or negative charge
  • Neither positive nor negative charge
The effective resistance of a circuit containing resistances in parallel is.
  • equal to the sum of the individual resistances.
  • smaller than any of the individual resistances.
  • greater than any of the individual resistances.
  • sometimes greater and sometimes smaller than the individual resistances.
Power dissipated in the resistor is $$P=$$ ________.
  • $$VI$$
  • $$I^2R$$
  • $$\displaystyle \frac {V^2}{R}$$
  • Any of these
The maximum number of 40 W bulbs connected in parallel which can be lighted safely using a 240 V supply with a 5A fuse is.
  • 30
  • 45
  • 8
  • 44
Which among the following is the commercial unit of electrical energy?
  • Volt
  • Watt
  • Ampere
  • KWh
When a current flows through a conductor, its temperature
  • increases
  • decreases
  • remains same
  • may increase or decrease
A man has five resistors each of value $$\frac {1}{5}\Omega $$. What is the maximum resistance he can obtain by connecting them? 
  • $${1} \Omega $$
  • $$5 \Omega $$
  • $$\dfrac {1}{2} \Omega $$
  • $$\dfrac {2}{5} \Omega $$
A material that does not allow electricity to flow through it is called a/an-
  • Electrical appliance
  • Electrical conductor
  • Electrical Insulator
  • None of these
Most of the electricity carrying wires near highways do not have a plastic covering like the wires used at homes. But there is no substantial loss of energy because
  • Air is a bad insulator of electricity
  • Air is a bad conductor of electricity
  • Electricity flows very fast near highways
  • Both B & C
A material that lets electricity to pass through it is called a/an-
  • Electrical appliances
  • Electrical conductor
  • Electrical insulator
  • None of these
Heat produced in a resistor when current is passed through it depends upon-
  • Current only
  • Time only
  • Current and time
  • None of these
Which one of the following substances are used to make electric switches and switch boards?
  • Conductors
  • Insulators
  • Semiconductors
  • None of the above
Look at the given figure.
It consists of a cell, a bulb with the two terminals X and Y and wires with ends P & Q and S & R. The direction of current will be :
417981_f7934cfa2ce54fdeaa20b15fdfababb4.png
  • PQRS
  • SRQP
  • PRQS
  • SQRP
Electric heaters used for cooking have the filament or the heating coil on a plate made up of clay because
  • Clay is a bad conductor of heat
  • Clay is a bad conductor of electricity
  • Both A & B
  • None of these
Which of the following statements is true?
  • Electricity can be created
  • Electricity flows in a circuit with gaps
  • Electricity is the flow of negative charge
  • All of the above
Electric current can flow through-
  • Silver
  • Copper
  • Iron
  • All of these
Find odd one out:
Copper, Salt water, Cotton, Human body.
  • Human body
  • Cotton
  • Salt water
  • Copper
State whether given statement is True or False
Glass is a good insulator.
  • True
  • False
Find the odd man out.
Copper, Aluminium, Iron, Wood, Brass.
  • Wood
  • Aluminium
  • Iron
  • Brass
Our body can conduct electric current.
  • True
  • False
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