1 markMCQSection A

A student plots V-I graphs for three samples of nichrome wire with resistances $R_1$ , $R_2$ and $R_3$ . Choose from the following the statement that holds true for this graph.

Electricity

Options

(a)R_1 = R_2 = R_3

(b)R_1 > R_2 > R_3

(c)R_3 > R_2 > R_1

(d)R_2 > R_1 > R_3

Official Answer

R3 > R2 > R_1

resistancenichrome wirevoltagecurrent

Marking Scheme

1R_3 > R_2 > R_1

Hint

The graph shows a linear relationship between voltage and current for all three samples of nichrome wire. This indicates that the resistance of each wire is constant and independent of the voltage.

Quick Oral Answer

The graph shows a linear relationship between voltage and current for all three samples of nichrome wire. This indicates that the resistance of each wire is constant and independent of the voltage. The slope of the graph represents the resistance, and the steeper the slope, the higher the resistance. Therefore, the correct order of resistance is R_3 > R_2 > R_1.

Analysis & Explanation

Common Mistakes

1R_1 = R_2 = R_3
2R_2 > R_1 > R_3

Interesting Facts

Nichrome wire is a type of resistance wire made from a nickel-chromium alloy.

It is commonly used in heating elements and electrical resistors due to its high resistance and durability.

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Frequently Asked Questions

How many marks does this question carry in CBSE Class 10 Science 2020?

This question carries 1 mark in the CBSE Class 10 Science 2020 examination.

Which chapter does this question come from in Science?

This question is from the chapter "Electricity" in the CBSE Class 10 Science syllabus.

What topic does this question cover in Science?

This question covers the topic "Electricity" from CBSE Class 10 Science.

What type of question is this in the CBSE Class 10 Science 2020 paper?

This is a MCQ question from Section A in the CBSE Class 10 Science 2020 paper.