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CBSE Questions for Class 10 Physics Electricity Quiz 9 - MCQExams.com

The resistors of resistances 2Ω,4Ω,5Ω are connected in parallel. The total resistance of the combination will be:
  • 2910Ω
  • 1920Ω
  • 1020Ω
  • 2019Ω
When resistances are connected in series then the same current flows through each resistance.
  • True
  • False
An electric kettle has two heating coils. When one of the coils is connected to an AC source, the water in the kettle boils in 10 min. When the other coil is used the water boils in 40 min. If both the coils are connected in parallel, the time taken by the same quantity of water to boil will be
  • 25 min
  • 15 min
  • 8 min
  • 4 min
Two resistances are connected in series as shown in the diagram. What is the current through R?
523764_51f9f2a93f5448d2815a2af6d952b696.png
  • 1A
  • 2A
  • 3A
  • 4A
Two resistances are connected in parallel and a current is sent through the combination. The current divides itself:
  • In the inverse ratio of resistance
  • In the direct ratio of resistance
  • Equally in both the resistance
  • In none of the above manner
What do you add to distilled water for making it to conduct electricity.
  • sulphuric acid
  • water
  • milk
  • base
In a circuit two or more cells of the same e.m.f. are connected in parallel in order to
  • Increase the P.D across a resistance in the circuit
  • Decrease the P.D across a resistance in the circuit
  • Facilitate drawing more current from the battery system
  • Change the e.m.f. across the system of batteries
Resistance of 2 Ω and 3 Ω are connected in series. If the potential difference across the 2 Ω resistor is 3 V, the potential difference across 3Ω is:
  • 4.5 V
  • 9 V
  • 3 V
  • 2 V
Human body is a 
  • good conductor of electricity
  • poor conductor of electricity
  • semiconductor
  • good insulator
An electric current is passed through a circuit containing two wires of the same material, connected in parallel. If the lengths and radii of the wires are in the ratio of 4/3 and 2/3, then the ratio of the currents passing through the wire will be
  • 3
  • 13
  • 89
  • 2
A resistor of 6kΩ with tolerance 10% and another of 4kΩ with tolerance 10% are connected in series. The tolerance of combination is about
  • 5%
  • 10%
  • 12%
  • 15%
The resistance of the series combination of two resistances is S. When they are joined in parallel the total resistance is P. If S = nP, then the minimum possible value of n is
  • 4
  • 3
  • 2
  • 1
Four bulbs marked 40W, 250V are connected in series with 250 V mains, the total power consumed is
  • 10W
  • 40W
  • 320W
  • 160W
Two resistors 400 Ω and 800 Ω are connected in series with a 6 V battery. the potential difference measured by voltmeter across 400 Ω resistor is:
  • 2 V
  • 1.95 V
  • 3.8 V
  • 4 V
What is the minimum number of bulbs, each marked 60W, 40V, that can work safely when connected in series with a 240V mains supply?
  • 2
  • 4
  • 6
  • 8
Two wire of same metal have same length but their cross-sections are in the ratio 3:1. They are joined in series. The resistance of thick wire is 10. The total resistance of combination will be
  • 10Ω
  • 20Ω
  • 40Ω
  • 100Ω
A 100W,200V bulb is connected to a 160V supply. The actual power consumption would be
  • 185W
  • 100W
  • 54W
  • 64W
1 kilowatt hr = __________ joules.
  • 10.6×106
  • 3.6×106
  • 30.6×106
  • 3.6×105
You are given several identical resistance each of value R=10 and each capable of carrying a maximum current of one ampere. It is required to make a suitable combination of these resistance of 5 which can carry a current of 4 ampere. The minimum number of resistance's of the type R that will be required for this job is
  • 4
  • 10
  • 8
  • 20
A 30 V, 90 W lamp is to be operated on a 120 V DC line. For proper glow, a resistor of ..... should be connected in series with the lamp. 
  • 10
  • 20
  • 30
  • 40
1Wh (Watt hour) is equal to :
  • 36×105J
  • 36×104J
  • 3600J
  • 3600Js1
Aluminium is preferred in overhead power cables because:
  • It is a good conductor
  • It acts as an insulator, in case of lightening
  • It prevents accidents
  • It is lightweight
A 30V-90W lamp is operated on a 120 V DC line. A resistor is connected in series with the lamp in order to glow it properly. The value of resistance is
  • 10Ω
  • 30Ω
  • 20Ω
  • 40Ω
In the following circuit, the 1 Ω resistor dissipates power P. If the resistor is replaced by 9 Ω, the power dissipated in it is
633155_5af06e19bb2b473f947d79ef17e93a5d.png
  • P
  • 3P
  • 9P
  • P/3
The equivalent resistance between A and B in the following figure is 
1392789_17740ba731c04e979050cd927f317589.png
  • 120Ω
  • 40Ω
  • 30Ω
  • 22.5Ω
Two electric bulbs have ratings respectively of 25 W,220 V and 100 W,220 V. If the bulbs are connected in series with a supply of 440 V, which bulb will fuse?
  • 25 W bulb
  • 100 W bulb
  • Both of these
  • None of these
The total electrical resistance between the points A and B of the circuit shown is:
718896_4d05c33b01374b26917d1e80f274149a.PNG
  • 9.23Ω
  • 15Ω
  • 30Ω
  • 100Ω
Which of the following are the properties of fuse wire? 
  • Made of alloy of tin
  • Has a low melting point
  • Connected in series with main supply
  • All of the above
When the electric current through the fuse exceeds a certain limit, the fuse wire melts and breaks.
  • True
  • False
The resistivity of the material of potentiometer wire is 5×105Ωm and its area of cross-section is 5×106m2. If 0.2 A current is flowing through the wire, then the potential drop per metre length of the wire is
  • 0.1 Vm1
  • 0.5 Vm1
  • 0.25 Vm1
  • 0.2 Vm1
  • 0.001 Vm1
The ratio of resistance of two copper wire of the same length and of same cross-sectional area, when connected in series to that when connected in parallel, is
  • 1:1
  • 1:2
  • 2:1
  • 4:1
  • 1:4
Two bulbs of 250 V and 100 W are first connected in series and then in parallel with a supply of 250 V. Total power in each of the case will be respectively 
  • 100 W,50 W
  • 50 W,100 W
  • 200 W,150 W
  • 50 W,200 W
A wire of resistance 'R' is cut into 'n' equal parts. These parts are then connected in parallel with each other. The equivalent resistance of the combination is?
  • nR
  • R/n
  • n/R2
  • R/n2
A student's 9.0V,7.5W portable radio was left on from 9:00 P.M. until 3:00A.M. How much charge passed through the wires?
  • 18000C
  • 24000C
  • 6000C
  • 12000C
The diagram shows identical lamps X and connected in series with a battery. The lamps light with normal brightness.If a third lamp Z is connected in parallel with lamp X, then what will happens to the brightness of the lamp Y?
809817_01ab713161f94e948ced2a814570a547.JPG
  • Brighter than normal
  • Normal
  • Dimmer than normal
  • Very dim (cannot be seen)
Observe the given figure and answer the following questions. The bulb will glow when a ______ is placed in between the probes.
809844_e790ef2d76374ef7837ca5b1298464e5.png
  • Crayon
  • Comb
  • Key
  • Piece of stone
Fuse is the most important safety device, used for protecting the circuits due to
  • Short circuiting and overloading
  • Overloading and earthing
  • Earthing only
  • Short circuiting, overloading and earthing.
4 bulbs rated 100W each, operate for 6 hours per day. What is the cost of the energy consumed in 30 days at the rate of Rs. 5/kWh?
  • Rs. 360
  • Rs. 90
  • Rs. 120
  • Rs. 400
Consider four circuits shown in the figure below. In which circuit power dissipated is highest?
Equivalent resistance between A and B is.
1375015_1cfb0d1d8ebb4befa0efa4026afd26c1.png
  • 3 Ω
  • 6 Ω
  • 1.5 Ω
  • 4.5 Ω
Ravi connected three bulbs with the cells and a switch as shown. When switch is moved to ON position.
809850_cb6100c978054f9f9cbe2e5ef2963ae0.jpeg
  • The bulb X will glow first.
  • The bulb Y will glow first.
  • The bulbs Z and X will glow first.
  • All the bulbs will glow simultaneously.
Two wires of same material have lengths L and 2L cross-sectional areas 4A and A respectively. The ratio of their resistances would be
  • 1:1
  • 1:8
  • 8:1
  • 1:2
n resistors each of resistance R first combine to give maximum effective resistance and then combine to given minimum effective resistance. The ratio of the maximum to minimum resistance is:
  • n
  • n2
  • n21
  • n3
Which of the following I-V graph represents ohmic conductors?
A wire of resistance 12ohm/meteris bent to form a complete circle of radius 10cm. The resistance between its two diametrically opposite points, A and B as shown in the figure is?
941830_84fcd7dfc99d458eaa8ab8bebdf48d31.PNG
  • 3Ω
  • 6πΩ
  • 6Ω
  • 0.6πΩ
An infinite ladder network of resistances is constructed with 1Ω and 2Ω resistance as shown in figure. The 6V battery between A and B has negligible internal resistance. The equivalent resistance between A and B is?
941868_178abfbcad934c11a2d8ba7337ce392e.png
  • 1Ω
  • 2Ω
  • 3Ω
  • 4Ω
Two coils have a combined resistance of 12Ω, when combined series and 5/3Ω, when connected in parallel. Their respective resistances are:
  • 6 and 6 ohms
  • 10 and 2 ohms
  • 5 and 7 ohms
  • 4 and 8 ohms
You have been provided with four 400 Ω resistors each. The number of ways in which these can be combined to have different equivalent resistances is
  • Seven different combinations and seven different equivalent resistances
  • Eight different combinations and seven different equivalent resistances
  • Nine different combinations and eight different equivalent resistances
  • Ten different combinations and nine different equivalent resistances.
A copper cylindrical tube has inner radius a and outer radius b. The resistivity is ρ. The resistance of the cylinder between the two rends is?
  • ρlb2a2
  • ρl2π(ba)
  • ρlπ(b2a2)
  • π(b2a2)ρl
Find the equivalent resistance between points A and B in the given circuit
1016671_4b496079b148434eb77299fcbbf74529.PNG
  • 6Ω
  • 12Ω
  • 4Ω
  • 18Ω
0:0:2


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