CBSE Questions for Class 10 Physics Electricity Quiz 5 - MCQExams.com

When a fuse is rated 8A, it means :
  • It will not work if current is less than 8A
  • It has a resistance of 8 ohm
  • It will work only if current is 8A
  • It will burn if current exceeds 8A
Fuse wire is made of :
  • Platinum
  • Copper
  • Aluminium
  • Alloy in tin and lead
An air conditioner is rated $$240\ V, 1.5\ kW$$. The air conditioner is switched on $$8\ hrs$$ each day. What is electrical energy consumed in $$30\ days$$?
  • $$2.88\ kWh$$
  • $$360\ kWh$$
  • $$120\ kWh$$
  • $$240\ kWh$$
The resistors of resistances $$2 \Omega, 4 \Omega, 5 \Omega$$ are connected in parallel. The total resistance of the combination will be :
  • $$\displaystyle \frac{29}{10} \Omega$$
  • $$\displaystyle \frac{19}{20} \Omega$$
  • $$\displaystyle \frac{10}{20} \Omega$$
  • $$\displaystyle \frac{20}{19} \Omega$$
Five resistors each of 1 ohm are connected in parallel. The resultant resistance of the combination is :
  • $$ 5 \Omega$$
  • $$ 1 \Omega$$
  • $$ 0.2 \Omega$$
  • $$ 2 \Omega$$
$$1kWh= $$ _________?
  • $$3600000\ J$$
  • $$10000\ J$$
  • $$4.2\ J$$
  • $$25000\ J$$
Kilowatt is the unit of electrical _______ but kilowatt-hour is the unit of electrical _______.
  • Power, Energy
  • Power, Electric potential
  • Power, Current
  • Energy, Power
What is one unit of household electrical energy in J?
  • $$1000\ J$$
  • $$3600\ J$$
  • $$0.6 \times 10^3 J$$
  • $$3.6 \times 10^6 J$$
What is the maximum resistance one can make with ten $$1 \Omega$$ resistors?
  • $$1 \Omega$$
  • $$2 \Omega$$
  • $$5 \Omega$$
  • $$10 \Omega$$
Which of the following is false about fuse ?
  • A fuse controls the current that flows to the appliance.
  • A fuse increases the resistance in the circuit to minimize the current flow.
  • A fuse allows high current to flow through the circuit without damaging the appliance.
  • A fuse protects the wiring and the appliance in the circuit from overheating.
In which of the following situations will a fuse possibly melt?
  • The earth wire is broken
  • There is a short circuit in the electrical circuit
  • The fuse is fixed along the neutral wire instead of the live wire
  • The fuse wire is connected to earth wire
Two fuse wires of the same length are rated 5 A and 20 A.Which of the fuse wires is thicker and why ?
  • 5 A
  • 20 A
  • Both have same thickness
  • Cannot be same
An electric kettle is rated as $$2.5\ kW, \ 250\ V$$. Find the cost of running the kettle for two hours at $$60\ \text{paisa}/\text{unit}$$.
  • $$Rs\ 6$$
  • $$Rs\ 3$$
  • $$Rs\ 9$$
  • $$Rs\ 1$$
Energy of the electric current is
  • Thermal
  • Nuclear
  • Electrical
  • Chemical
A current of $$3\ A$$ flows through a resistance when it is connected across a 12V source. What should the current be if the resistance is increased by $$4\ \Omega$$ and connected across the same voltage source?
  • $$1.5\ A$$
  • 4 A
  • 1.6 A
  • 24 A
The least resistance that can be obtained by combining resistance of $$6 \Omega, 3 \Omega$$ and $$X \Omega$$ is $$1 \Omega$$.
Then $$X$$ is
  • $$3 \Omega$$
  • $$2 \Omega$$
  • $$4 \Omega$$
  • $$6 \Omega$$
Which one of the following is different from the others?
  • Joule
  • Kilowatt hour
  • Erg
  • Watt
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Assertion is incorrect but Reason is correct
Conventionally, the direction of the current is taken as the direction of flow
  • of negative charges
  • the direction of flow of atoms
  • of molecules
  • of positive charges
In the network given below, the current flowing through the resistance $$2 R$$ is

100462.png
  • $$\dfrac { E }{ R } $$
  • $$\dfrac { E }{ 7R } $$
  • $$\dfrac { 2E }{ 7R } $$
  • $$\dfrac { 2E }{ R } $$
State whether given statement is True or False
Conventional current always flows from a body having high electron density to body having low electron density.
  • True
  • False
A resistance of $$0.01\ \Omega$$ is connected in parallel with a resistance of $$1\ k\Omega$$ The resistance of the combination will be:
  • $$1000\ \Omega$$
  • $$10\ \Omega$$
  • $$1\ \Omega$$
  • $$0.01\ \Omega$$
Three resistors each of $$10 \Omega$$ are connected in series to a battery of potential difference 150 v. The current flowing through it is ..... A.
  • 45
  • 5
  • 15
  • 20
If a man has five resistors each of value $$\dfrac { 1 }{ 5 } \Omega $$ then is the maximum resistance he can obtain  by connecting them, is :
  • $$1\Omega $$
  • $$5\Omega $$
  • $$\dfrac { 1 }{ 2 } \Omega $$
  • $$\dfrac { 2 }{ 5 } \Omega $$
Fuse should be connected to ..... wire of the circuit
  • Earth
  • Neutral
  • Phase
  • Any of the above
How much energy in kilowatt hour is consumed in operating ten 50 watt bulbs for 10 hours per day in a month (30 days)
  • 1500
  • 5000
  • 15
  • 150
An 1800 W toaster, a 1.3 kW frying pan are plugged into the same $$20 A-120V$$ line then
  • fuse will not blow
  • fuse will blow
  • supply will spark
  • fuse is just saved
An electric heater, operating at $$220\ V$$, boils $$5\ l$$ of water in $$5\ \text{minutes}$$. If it is used on a $$110\ V$$ line, it will boil the same amount of water in:
  • $$10\ \text{minutes}$$
  • $$20\ \text{minutes}$$
  • $$5\ \text{minutes}$$
  • $$1\ \text{minute}$$
An electric bulb is rated '100 W, 250 V' . What is the resistance of bulb ?
  • 2.5 ohm
  • 625 ohm
  • 25000 ohm
  • 1500 ohm
Choose the correct option.
  • $$kW=$$ unit of power and $$kWh =$$ unit of energy.
  • $$kW=$$unit of energy and $$kWh =$$ unit of power.
  • $$kW$$ and $$kWh$$ are both of unit of energy.
  • $$kW$$ and $$kWh$$ are both of unit of power.
A given wire of resistance $$1\,\Omega$$ is stretched to double its length. What will be its new resistance?
  • $$1\, \Omega$$.
  • $$8\, \Omega$$.
  • $$2\, \Omega$$.
  • $$4\, \Omega$$.
The filament of a bulb takes a current 0.1 A when potential difference across it is 0.2 V. When the potential difference across it becomes 1.0 V, the current becomes 0.4 A.  The resistance of filament in each case will be 
  • $$2.0\,\Omega$$, $$2.5\,\Omega$$
  • $$2.5\,\Omega$$, $$2\,\Omega$$
  • $$1.0\,\Omega$$, $$2.5\,\Omega$$
  • $$2.0\,\Omega$$, $$2\,\Omega$$
An electric heater kept in a vacuum is heated continuously by passing an electric current. Its temperature:
  • It will go on rising with time
  • It will stop after some time as it will lose heat to the surroundings by conduction
  • It will rise for sometime and thereafter will starts falling
  • It will become constant after sometime because of loss of heat due to radiation
 The equivalent resistance R of three resistors $$R_1$$, $$R_2$$ and $$R_3$$ joined in parallel is
  • $$\displaystyle R= R_1+R_2+R_3$$
  • $$\displaystyle R= 1/R_1+1/R_2+1/R_3$$
  • $$\displaystyle R= \frac{R_1R_2R_3}{R_1R_2+R_2R_3+R_3R_1}$$
  • $$\displaystyle R=1/(R_1+R_2+R_3)$$
A uniform wire of resistance $$50\Omega$$ is cut into 5 equal parts. These parts are now connected in parallel. The equivalent resistance of the combination is
  • $$2\Omega$$
  • $$10\Omega$$
  • $$250\Omega$$
  • $$6250\Omega$$
In our household applications, commercial unit of electricity is used. One unit is equal to:
  • $$1\ kW$$
  • $$1\ kWh$$
  • $$1\ kW/h$$
  • $$1\ Wh$$
What is the approximate resistance setting of a rheostat in which $$650 \  mA$$ of current flows with a $$150 \ V$$ source?
  • $$230 \ \Omega$$
  • $$56 \ \Omega$$
  • $$15 \ \Omega$$
  • $$13 \ \Omega$$
In the circuit shown below in Fig., the value of x if the equivalent resistance between A and B is $$4\, \Omega$$ will be:
173952.png
  • $$2\, \Omega$$
  • $$1\, \Omega$$
  • $$1.5\, \Omega$$
  • $$3\, \Omega$$
When two resistors with resistances $$R_1$$ and $$R_2$$ are connected in series, then the total equivalent resistance is 
  • $$\dfrac{R_1R_2}{R_1+R_2}$$
  • $$R_1+R_2$$
  • $$1/R_1+1/R_2$$
  • $$R_2-R_1$$
Equivalent resistance is more than either of the two resistances when they are in:
  • Series
  • Series and parallel
  • Parallel
  • none of these.
In the figure the equivalent resistance of the following combination of resistors $$r_1,\, r_2,\, r_3$$ and $$r_4$$, if $$r_1\, =\, r_2\, =\,r_3\, =\, r_4\, =\, 2.0\, \Omega$$, between the points A and B is  
173934.png
  • $$2.0\, \Omega$$
  • $$4.0\, \Omega$$
  • $$6.0\, \Omega$$
  • $$5.0\, \Omega$$
Four resistors each of resistance $$2\, \Omega$$ are connected in parallel. What is the effective resistance?
  • $$2\, \Omega$$
  • $$5\, \Omega$$
  • $$0.5\, \Omega$$
  • $$8\, \Omega$$
A wire of uniform thickness with a resistance of $$27\, \Omega$$ is cut into three equal pieces and they are joined in parallel. The equivalent resistance of the parallel combination will be :
  • $$3\, \Omega$$
  • $$9\, \Omega$$
  • $$27\, \Omega$$
  • $$49\, \Omega$$
The energy consumed by $$100 \ W$$ electric bulb in $$5 \ hours$$ is:
  • $$0.5 \ kWh $$
  • $$1.5 \ kWh $$
  • $$5 \ kWh $$
  • $$2.5 \ kWh $$
Which of above combinations have equivalent resistance $$ 1\Omega $$ between  X and Y?
173747.png
  • (a)
  • (b)
  • (c)
  • (d)
Two resistances are connected in two configurations- series or parallel. Which  represents the parallel combination? 
173724_95a5e5d3dbf1460bb3f068d942aaa14d.png
  • A
  • A and B both
  • B
  • None of these.
You have three resistors of values $$2\, \Omega,\, 3\, \Omega$$, and $$5\, \Omega$$. If they are in parallel ,then the total resistance is :
  • $$0.97\, \Omega$$
  • $$2 \, \Omega$$
  • $$10 \, \Omega$$
  • $$3\, \Omega$$
Two resistors of resistance $$4\, \Omega$$ and $$6\, \Omega$$ are connected in parallel to a cell to draw 0.5 A current from the cell. What is current through resistor $$4\, \Omega$$ ?
  • 0.3 A
  • 0.5 A
  • 0.2 A
  • 1.2 A
Find out the total power supplied by the 60-V source in the circuit shown in figure.
174599_7f4f677325a34001b8e37caf1f899102.png
  • 360 W
  • 200 W
  • 400 W
  • 180 W
Two resistors of resistance $$4\, \Omega$$ and $$6\, \Omega$$ are connected in parallel to a cell to draw $$0.5 A$$ current from the cell. What  is the current through resistor $$6\, \Omega$$?
  • $$0.2 \ A$$
  • $$0.5 \ A$$
  • $$2.4 \ A$$
  • $$1.2 \ A$$
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