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CBSE Class 10 – Electricity important questions Set for practice

Electricity class 10 question bank set A

  1. What are the differences between series and parallel connections of resistors?
  2. Two wires, A and B, of the same metal, are connected in parallel. Wire A has length and radius, and wire B has length and radius. Then what is the ratio of the total resistance of parallel combination and the resistance of wire A?
  3. Kilowatt-hour is a unit of ………………
  4. If a 1200 W electric iron is used daily for 30 minutes, how much total unit is consumed in the month of April? 
  5. The resistance of a 1m long nichrome wire is 6 ohms. If we reduce the length of the wire to 70 cm. what will its resistance be? 
  6. A heater coil is cut into two equal parts, and only one part is now used in the heater. The heat generated will now be ……
  • One fourth
  • Halved
  • Doubled
  • Four times
  1. Two bulbs of 100W and 200W working at 220 volts are joined in series with a 220-volt supply. What will be the total power consumption?
  2. Two bulbs, one of 50 watts and another of 25 watts, are connected in series to the mains. The ratio of the currents through them is ……
  3. Name the factors on which the heat produced in a wire depends when current is passed in it, and state how does it depend on the factors stated by you.
  4. Three appliances are connected in parallel to the same source, which provides a voltage of 220 V. A fuse connected to the source will blow if the current from the source exceeds 10A. If the three appliances are rated 60W, 500W, and 1200W at 220V, will the fuse blow?
  1. Find the equivalent resistance of the network shown in the figure between points A and B. The value of R is 3 ohm.
  1. The voltage-current graph of a metallic conductor at two different temperatures T1 and T2 is shown below. At which temperature is the resistance higher?
  1. Kilowatt is the unit of electrical _______, but kilowatt-hour is the unit of electrical _______.
  2. Two fuse wires of the same length are rated 5 A and 20 A. Which of the fuse wires is thicker and why?
  3. Assertion – Fuse wire must have high resistance and a low melting point.                                          
  4. Reason – Fuse is used for small current flow only.
  1. An electric bulb rated 220 V – 100 W will fuse if it consumes 131 W. What voltage fluctuations can it withstand?
  1. Find out the total power supplied by the 60-V source in the circuit shown in the figure.
  1. In the circuit shown below in Fig., the value of x if the equivalent resistance between A and B is 4 Ohm. will be:
  1. Three resistors of 6 ohms, 2 ohms, and 4 ohms are joined to an ammeter A and a cell of e.m.f. 6.0 V as shown in the figure. What will be the effective resistance of the circuit ?
  2. Two resistors of resistance, 4 ohms, and 6 ohms, are connected in parallel to a cell to draw 0.5 A current from the cell. What is current through resistor 4 ohm?
  3. Two wires of the same metal have the same length, but their cross-sections are in the ratio 3:1. They are joined in series. The resistance of the thicker wire is 10 ohm. What is the total resistance of the combination?
  4. Two 220 volt, 100-watt bulbs are connected first in series and then in parallel. Each time the combination is connected to a 220-volt a.c.supplyline. The power drawn by the combination in each case respectively will be?
  1. In the circuit shown in the figure, How much current is flowing through resistance 5 ohm?