CBSE Questions for Class 10 Physics Electricity Quiz 4 - MCQExams.com

The smallest resistance that can be obtained by combining 10 resistors each of resistance $$10 \Omega$$ is
  • $$10\Omega$$
  • $$0.5\Omega$$
  • $$2\Omega$$
  • $$20\Omega$$
  • $$1\Omega$$
In the series combination of two or more than two resistances.
  • The current through each resistance is same
  • The voltage through each resistance is same
  • Neither current nor voltage through each resistance is same
  • Both current and voltage through each resistance are same
In a house, individual powers of two elements are $$100\ W\ 100\ W$$. The effective power of their series combination will be :
  • $$120\ W$$
  • $$75\ W$$
  • $$50\ W$$
  • $$60\ W$$
A light bulb is rated at 100 W for a 220 V ac supply. The resistance of the bulb is then
  • $$284

    \Omega$$
  • $$384

    \Omega$$
  • $$484

    \Omega$$
  • $$584 \Omega$$
If five equal pieces of $$25\Omega$$ are connected in parallel, then their equivalent resistance will be............
  • $$25\Omega$$
  • $$1\Omega$$
  • $$5\Omega$$
  • $$\dfrac{1}{5}\Omega$$
Combine three resistors $$5\Omega, 4.5\Omega$$ and $$3\Omega$$ in such a way that the total resistance of this combination is maximum:
  • $$12.5\Omega$$
  • $$13.5\Omega$$
  • $$14.5\Omega$$
  • $$16.5\Omega$$
$$1$$ micro-ampere $$=$$ ______ ampere
  • $$10^{-9}$$
  • $$10^{-6}$$
  • $$10^{6}$$
  • $$10^{3}$$
Which of the following is a conductor ?
  • Sugar
  • Graphite
  • Ceramic
  • Wood
A (75 - j40 ) $$\Omega $$ load is the connected to a coaxial line of $$z _ { 0 } = 75 \Omega$$ The load matching on the line can be accomplished by connecting
  • A short-circuit stub at the load
  • An inductance at the load
  • A short circuited stub at a specific distance from the load
  • A capacitance at a specific distance from the load
A cell of emf $$6\ V$$ and resistance $$0.5\ ohm$$ is short circuited. The current in the cell is 
  • $$3\ amp$$
  • $$12\ amp$$
  • $$24\ amp$$
  • $$6\ amp$$
 Miniature circuit breaker (MCB) works on the heating effect of current.
  • True
  • False
The current in a car headlamp is $$3.0$$A when connected to a $$12$$V battery. What is the resistance of the lamp when it is lit?
  • $$0.25\Omega$$
  • $$4.0\Omega$$
  • $$15\Omega$$
  • $$36\Omega$$
Write true or false for the following statements :
Electric power is also called BOTU. 
  • True
  • False
If four resistances are connected as shown in the fig. between A and B, the effective resistance is:
10976_43c59b7de176426e979157e74b15224e.png
  • $$3\Omega $$
  • $$1\Omega $$
  • $$2.4\Omega $$
  • $$2\Omega $$
The resistance between A and B in the given figure will be(in ohm):

79904.JPG
  • 20
  • 30
  • 90
  • more than 10 but less than 20
The resistivity of a conductor with a current density  of $$2.5 Am$$$$^{-2}$$  when an electric field $$5\times 10^{-8}Vm^{-1}$$ is applied to it, is
  • $$1.0\times 10^{-8}\Omega m $$
  • $$2.0\times 10^{-8}\Omega m $$
  • $$0.5\times 10^{-8}\Omega m $$
  • $$12.5\times 10^{-8}\Omega m $$
A certain piece of copper is to be shaped into a conductor of minimum resistance. Which of the following options will give the minimum resistance? 
  • $$L$$ and $$A$$
  • $$2L$$ and $$\dfrac{A}{2}$$
  • $$\dfrac{L}{2}$$ and $$2A$$
  • $$3L$$ and $$\dfrac{A}{3}$$
$$\text{Assertion(A)} :$$ However long a fuse wire may be,the safe current that can be allowed is the same.
$$\text{Reason (R)} :$$ The safe current that can be allowed to pass through a fuse wire depends on the radius of the wire.
  • Both (A) and (R) are true and (R) is the correct explanation of A.
  • Both (A) and (R) are true but (R) is not the correct explanation of A.
  • (A) is true but (R) is false.
  • (A) is false but (R) is true. 
The least resistance that one can have from six resistors each of 0.1 ohm resistance is:
  • 0.167$$\ \Omega $$
  • 0.00167 $$\Omega $$
  • 1.67 $$\Omega $$
  • 0.0167 $$\Omega $$
Three resistances each of $$3\Omega $$ are connected as shown in figure. The resultant resistance between A and F is:

10948_f7992fa6e00a4457af5e249c4e194e5d.jpg
  • $$9\Omega $$
  • $$2\Omega $$
  • $$4\Omega $$
  • $$1\Omega $$
A wire 50 cm long and $$1  \ mm^2$$ in cross-section carries a current of 4 A when connected to a 2 V battery. The resistivity of the wire is
  • $$2\times 10^{-7}\Omega m$$
  • $$5\times 10^{-7}\Omega m$$
  • $$4\times 10^{-6}\Omega m$$
  • $$1\times 10^{-6}\Omega m$$
A wire of resistance $$20\Omega $$ is bent in the form of a square. The resistance between the ends of diagonal is:
  • $$10\Omega $$
  • $$5\Omega $$
  • $$20\Omega $$
  • $$15\Omega $$
The equivalent conductance of two wires of resistance 10 ohm and 5 ohm joined together in parallel is:
  • $$\dfrac{50}{15}$$ mho
  • $$\dfrac{35}{50}$$ mho
  • $$0.3$$ mho
  • $$\dfrac{2}{3}$$ mho
The resistance between A and B is:

10952.png
  • $$9\Omega $$
  • $$2\Omega $$
  • $$12\Omega $$
  • $$8\Omega $$
There are $$5$$ tube-lights each of $$40\ W$$ in a house. These are used on an average for $$5\ hrs/day$$. In addition, there is an immersion heater of $$1500\ W$$ used on an average for $$1\ hr/day$$. The number of units of electricity that are consumed in a month of $$30\ days$$ is:
  • $$25\ units$$
  • $$50\ units$$
  • $$75\ units$$
  • $$100\ units$$
If an electric iron of $$1200 \ W$$ is used for $$30 \ minutes$$ everyday, find electric energy consumed in the month of April.
  • $$12\  kWh$$
  • $$18 \ kWh$$
  • $$36\  kWh$$
  • $$6\  kWh$$
The resistance of a conductor is 1.08$$\ \Omega $$. To reduce it to 1$$\ \Omega $$, the resistance that must be connected is:
  • $$0.08$$ $$\Omega $$ in series
  • $$13.5$$ $$\Omega $$ is parallel
  • $$0.08$$ $$\Omega $$ in parallel
  • $$13.5$$ $$\Omega $$ in series.
The resultant resistance of two resistors when connected in series is 48 ohm. The ratio of their resistances is 3 :The value of each resistance is
  • 20$$\Omega $$ ,28$$\Omega $$
  • 32$$\Omega $$ ,16$$\Omega $$
  • 36$$\Omega $$, 12$$\Omega $$
  • 24$$\Omega $$, 24$$\Omega $$
Three unequal resistors in parallel are equivalent to a resistance $$1\ \Omega$$. If two of them are in the ratio $$1 : 2$$ and if no resistance value is fractional, the largest of the three resistances in $$\Omega$$ is:
  • $$4$$
  • $$6$$
  • $$8$$
  • $$12$$
The electrical energy in kilowatt hours consumed in operating ten $$50\ W$$ bulbs for $$10\ hrs/day$$ in a month of $$30\ days$$ is
  • $$1500$$
  • $$15000$$
  • $$15$$
  • $$150$$
The current that passes through 20 ohm resistance when it is connected in parallel with a 30 ohm resistance and this set is connected to a battery of 2V is
  • 0.2A
  • 0.3A
  • 0.1A
  • 0.016A
A house is fitted with ten lamps of each $$60\ W$$. Each lamp burns for $$5\ hrs$$ a day on an average. The cost of consumption in a month of $$30\ days$$ at $$80$$ rupees per unit is:
  • $$Rs. 152$$
  • $$Rs. 252$$
  • $$Rs. 352$$
  • $$Rs. 452$$
An electric kettle consumes 1 kW of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
  • 1A
  • 2A
  • 4A
  • 5A
Observe the figure given below.
Find the current passing through $$6\Omega$$ resistor.

84511_7c503e3093074e8ea56938a6589bb146.png
  • 0.72 A
  • 0.80 A
  • 0.48 A
  • Cannot be said
Find power dissipated in $$4 \ \Omega$$ resistor :

80249_889738a87ad54aa29311899d56fe72d9.jpg
  • 12 W
  • 16 W
  • 4 W
  • 6 W
Name the effect of current responsible for the glow of the bulb in an electric circuit.
  • Chemical
  • Heating
  • Magnetic
  • Heating and Magnetic
You have a large supply of light bulbs and a battery. You start with one light bulb connected to the battery and notice its brightness. You then add one light bulb at a time, each new bulb being added in series to the previous bulbs then
  • Brightness of the bulbs will increase
  • Current through the bulbs will increase
  • Power transferred from the battery will decrease
  • Lifetime of the battery will decrease
In the electric circuit shown in the figure, the effective resistance of two 8 $$\Omega$$ resistors in the combination is :

79956_c6fb4c3db6484536ba21551c2b435b4e.png
  • $$4 \Omega$$
  • $$16 \Omega$$
  • $$2 \Omega$$
  • $$ 12 \Omega$$
   Answer question numbers 72 and 73 based on the following information.
Solar surface radiates energy uniformly at a rate of $$4 \times  10^{26}W$$. This energy spreads or distributes uniformly and normally outwards.

Considering Earth and the Sun to be spherical object, the amount of radiant energy received by the Earth per second is nearly
  • $$1360 \:W.$$
  • $$1.75 \times 10^{17}\:W$$
  • $$3.5 \times 10^{17}\:W$$
  • $$7 \times 10^{17}\:W$$
Two students set up their circuits for finding the equivalent resistance of two resisto connected in series in two different ways as shown.
The circuit (s) likely to be labelled as incorrect :

86553_2ff2902960a94a4e82b4a9a71acd9e84.png
  • are neither of the two circuits
  • is only circuit I
  • is only circuit II
  • are both one circuits
Which effect of current is responsible for a compass placed in an electric field to be deflected?
  • Heating effects of current.
  • Magnetic effects of current.
  • Conducting effects of heat.
  • Chemical effects of current
When a wire of uniform cross-section a, length l and resistance R is bent into a complete circle, resistance between any two of diametrically opposite points will be:
  • R/8
  • 4R
  • R/2
  • R/4
Combined resistance is the sum of separate resistances provided that the various conductors are connected in______ .
  • Series
  • Parallel
  • Both series and parallel
  • Data insufficient
A wire of resistance R is cut into ten equal parts which are then joined in parallel. The new resistance is:
  • 0.01 R
  • 0. 1 R
  • 10 R
  • 100 R
Two wires of resistance $$R_1$$ and $$R_2$$ are joined in parallel. The equivalent resistance of the combination is:
  • $$R_1R_2/(R_1+R_2)$$
  • $$R_1+R_2$$
  • $$R_1 \times R_2$$
  • $$R_1R_2$$
Three resistors of $$4.0\ \Omega$$, $$6.0\ \Omega$$ and $$10.0\ \Omega$$ are connected in series. What is their equivalent resistance?
  • $$20\ \Omega$$
  • $$7.3\ \Omega$$
  • $$6.0\ \Omega$$
  • $$4.0\ \Omega$$
A piece of wire of resistance R is cut into five equal parts. These parts are then connected in parallel. If the equivalent resistance of this combination is R', then the ratio R/R' is:
  • 1/25
  • 1/5
  • 5
  • 25
Two wires of same metal have the same length but their cross-sections area in the ratio 3 :They are joined in series. The resistance of the thicker wire is $$10\Omega$$ .The total resistance of the combination will be:
  • $$40 \Omega$$
  • $$40/3 \Omega$$
  • $$5/2 \Omega$$
  • $$100 \Omega$$
Three resistances of 2, 3 and 5 $$\Omega$$ are connected in parallel to a lay battery 10V with negligible internal resistance. The potential difference across the $$3 \Omega$$ resistance will be
  • 2 V
  • 3 V
  • 5 V
  • 10 V
Kilowatt-hour is the unit of :
  • potential difference.
  • electric power.
  • electrical energy.
  • charge.
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