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10th CBSE
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The figure given below shows three resistors:
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Their combined resistance is

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Important Questions on Electricity

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10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 37
If two resistors of 25 Ω and 15 Ω are joined together in series and then placed in parallel with a 40 Ω resistor, the effective resistance of the combination is:
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10th CBSE
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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 38
The diagram below shows part of a circuit:

If this arrangement of three resistors was to be replaced by a single resistor, its resistance should be:
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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 39
In the circuit shown below:
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The potential difference across the 3 Ω resistor is:
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10th CBSE
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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 40
A battery and three lamps of equal resistance are connected as shown:
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Which of the following statements about the current at X,Yand Z is correct?
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10th CBSE
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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 41
V1, V2, V3 are the p.ds. across the 1 Ω, 2 Ω and 3 Ω resistors in the following diagram, and the current is 5 A.
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Which one of the columns a to d shows the correct values of V1, V2 and V3 measured in volts?
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10th CBSE
IMPORTANT
Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Multiple Choice Questions (MCQs)>Q 42
A wire of resistance R1 is cut into five equal pieces. These five pieces of wire are then connected in parallel. If the resultant resistance of this combination be R2, then the ratio R1R2 is:
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10th CBSE
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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Questions Based on High Order Thinking Skills (HOTS)>Q 43
Show with the help of diagrams, how you would connect three resistors each of resistance 6 Ω so that the combination has a resistance of (i) 9 Ω (ii) 4 Ω.
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10th CBSE
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Science for Tenth Class Part - 1 Physics>Chapter 1 - Electricity>Questions Based on High Order Thinking Skills (HOTS)>Q 44
Two resistances when connected in parallel give the resultant value of 2 ohm; when connected in series the value becomes 9 ohm. Calculate the value of each resistance.