Question 61 markMCQSection A

The values of mA and μA\mu A are

Electricity
Electric Current and Circuit

Options

(A)10−6 A10^{-6} \text{ A} and 10−9 A10^{-9} \text{ A} respectively
(B)10−3 A10^{-3} \text{ A} and 10−6 A10^{-6} \text{ A} respectively
(C)10−3 A10^{-3} \text{ A} and 10−9 A10^{-9} \text{ A} respectively
(D)10−6 A10^{-6} \text{ A} and 10−3 A10^{-3} \text{ A} respectively

Official answer

Option B is correct.

Answer keywords:milliamperemicroampere10^-3 A10^-6 A

Marking scheme

  1. 1.1 mark for identifying the correct values of mA and μ\muA as 10−310^{-3} A and 10−610^{-6} A respectively.

Hint

Recall the prefixes 'milli-' (10−310^{-3}) and 'micro-' (10−610^{-6}) used for units of current.

Quick oral answer

One milliampere is equal to 10−310^{-3} amperes, and one microampere is equal to 10−610^{-6} amperes.

Common mistakes

  1. 1.Confusing microampere (μ\muA) with nanoampere (nA) which is 10−910^{-9} A.
  2. 2.Swapping the values of milli and micro.

Analysis and explanation

According to the NCERT text, small quantities of current are expressed in milliampere (1 mA=10−3 A1 \text{ mA} = 10^{-3} \text{ A}) or in microampere (1 μA=10−6 A1 \text{ } \mu\text{A} = 10^{-6} \text{ A}).


  • Why Option B is correct: It correctly identifies 1 mA=10−3 A1 \text{ mA} = 10^{-3} \text{ A} and 1 μA=10−6 A1 \text{ } \mu\text{A} = 10^{-6} \text{ A}.
  • Why other options are incorrect:
  • Option A: 10−6 A10^{-6} \text{ A} is microampere and 10−9 A10^{-9} \text{ A} is nanoampere, which is incorrect for mA.
  • Option C: 10−9 A10^{-9} \text{ A} is nanoampere, not microampere.
  • Option D: The values are swapped; 10−6 A10^{-6} \text{ A} is microampere and 10−3 A10^{-3} \text{ A} is milliampere.

Interesting facts

The unit ampere is named after André-Marie Ampère, one of the main founders of classical electromagnetism.

Question details

Q6 of 39 questions

Board
CBSE
Class
Class 10
Subject
Science
Year
2020
Section
Section A
Marks
1
Type
MCQ
Chapter
Electricity
Topic
Electric Current and Circuit
Bloom's level
Remembering
Syllabus topic
Electric current, potential difference and electric current.

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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 "Electric Current and Circuit" 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.