Resistor Color Codes MCQ

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Resistor color codes play an important role in designing electronic devices. This article discusses some important choice-based questions on Resistor Color Codes from the Current Electricity concept of the latest CBSE Class 12 Physics Syllabus.

Resistor values are indicated with color codes as defined by the International Standard IEC 60062. The color coding is usually done with four color bands. To know the value of resistors, the calculations based on color code are to be known.

The color bands are printed on the resistors to determine the resistance value. Some interesting features are:

The leaded resistors with a power rating up to 1 W are marked in this way.
Apart from the resistance, the color codes also indicate the tolerance limit and the rate of failure of the resistors.
The exact band number is dependent on the number of bands which varies from 3 to 6 bands.
The first two indicate the resistance and the third is the multiplier.

Resistor Color Codes for 4- band and 5-band Resistor

Resistor Color Codes for 4 - band and 5 - band Resistor

Resistor Color Codes MCQs

Q.1. Resistor Color codes were developed by:

Radio Manufacturers Association (RMA)
International Organization for Standardization (ISO)
Electronics Industries Alliance (EIA)
a & b are correct

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A.1. The correct option is A. Radio Manufacturers Association (RMA)

Explanation: The resistor color code was invented by the Radio Manufacturers Association (RMA) in the 1920s.

Q.2. Why is Color Coding used for Resistors?

Cylindrical Shape
Small Size
Due to Through Hole Component
A & B are correct

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A.2. The correct option is D. A & B are correct

Explanation: Electronic components and wires are given color coding to identify their value and function. The color bands help in identifying Components and wires are coded with colors to identify their value and function. These help in identifying resistor resistive values, tolerance percentage, and resistor size indicative of its power rating.

Q.3. The number of color bands used in resistors is _______.

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A.3. The correct option is B. 6

Explanation: Resistors have color bands divided into three types: 4 band resistor, 5 band resistor, and 6 band resistor.

Q.4. Red color bands on resistors are read from________.

Left to Right
From both sides
Right to Left
All are correct

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A.4. The correct option is A. Left to Right

Explanation: Resistors do not start with a metallic band on the left. Hence if a resistor has a gold or silver band on one end, there is a resistor tolerance of 5% or 10%. The resistor position on this band is read from left to right.

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Q.5. What are the first two bands on the resistors?

Tolerance
Decimal Multiplier
Two digits
All are incorrect

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A.5. The correct option is C. Two digits

Explanation: The first two bands on a resistor are two digits that denote the resistance value in Ohms. In a 3-band or 4-band resistor, the third band is representative of the multiplier.

Q.6. The digit that represents the green band on a resistor is ________.

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A.6. The correct option is C. 5

Explanation: From the resistor color code table, green is represented by the digit 5.

Q.7. _______ is to be added after the first two digits in a decimal multiplier?

Resistance
Digits
Tolerance
Zeros

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A.7. The correct option is D. Zeros

Explanation: The first two digits are representative of the resistance values and after that, zeroes are added to the decimal multiplier as given in the resistor code.

Q.8. Zero Ohm resistors are used for __________.

Connect the Tracks
As Jumpers
Increase Machine Production Time
All are correct

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A.8. The correct option is D. All are correct

Explanation: Zero Ohm resistors are most conveniently used as jumpers, connected with tracks, and also useful in increasing the machine production time.

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Q.9. A no band on the resistor means the tolerance is __________.

0.3%
15%
30%
20%

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A.9. The correct option is D. 20%

Explanation: Tolerance is defined as the percentage error in resistance of the resistor. Thus, a gold tolerance band has a tolerance of 5%, silver has a tolerance of 10% and when there is no band, the tolerance is 20%.

Q.10. The color coding indicates the _______ value or rating of the resistor.

Numerical
Resistance
Alphabetical
a & c are correct

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A.10. The correct option is A. Numerical

Explanation: Color codes help in identifying the value and function of the electronic components and wires. They also help in identifying the resistive value, percentage tolerance, and wattage rating based on the resistor size.

Q.11. 7 digit is represented by ________ in the resistor color code.

Blue
Violet
Green
Red

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A.11. The correct option is B. Violet

Explanation: As per the resistor color code, the 7 digit stands for Violet.

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Resistor Color Codes MCQ

Resistor Color Codes MCQs

CBSE CLASS XII Related Questions

1.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

2.
Write any two features of nuclear forces.

4.
If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

6.
What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?

Similar Physics Concepts

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Resistor Color Codes MCQ

Resistor Color Codes MCQs

CBSE CLASS XII Related Questions

1. If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

2. Write any two features of nuclear forces.

4. If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

6.What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
If Bohr’s quantization postulate (angular momentum \( = \frac{nh}{2\pi} \)) is a basic law of nature, it should be equally valid for the case of planetary motion also. Why, then, do we never speak of quantization of orbits of planets around the Sun? Explain.

2.
Write any two features of nuclear forces.

4.
If both the number of protons and the neutrons are conserved in each nuclear reaction, in what way is mass converted into energy (or vice versa) in a nuclear reaction? Explain.

6.
What is displacement current (\( i_d \))? Considering the case of charging of a capacitor, show that \( i_d = \varepsilon_0 \frac{d\Phi_E}{dt} \). What is the value of \( i_d \) for a conductor across which a constant voltage is applied?