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10th CBSE
IMPORTANT
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Which of the following represents voltage?

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Important Questions on Electricity

MEDIUM
10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 10
A cylinder conductor of length l and uniform area of cross-section A has resistance R. Another conductor of length 2l and resistance R of the same material has area of cross-section.
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10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 11

A student carries out an experiment and plots the V-I graph of three samples of nichrome wire with resistances R1 , R2 and R3 respectively as shown in figure. Which of the following is true?

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10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 12
If the current I through a resistor is increased by 100% (assume that temperature remains unchanged), what will be the increase in power dissipated?
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10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 13
The resistivity does not change if
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10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 14
In an electrical circuit three incandescent bulbs. A, B and C of rating  40 W , 60 W and 100 W, respectively are connected in parallel to an electric source. Which of the following is likely to happen regarding their brightness?
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10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 15
In an electrical circuit, two resistors of 2 Ω and 4 Ω respectively are connected in series to a 6 V battery. The heat dissipated by the 4 Ω resistor in 5 s will be 
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10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 16
An electric kettle consumes 1 k W of electric power when operated at 220 V. A fuse wire of what rating must be used for it?
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10th CBSE
IMPORTANT
NCERT EXEMPLAR PROBLEMS-SOLUTIONS SCIENCE Class X>Chapter 12 - Electricity>Multiple Choice Questions (MCQs)>Q 17
Two resistors of resistance 2 Ω and 4 Ω when connected to a battery will have