1.
What's the best definition of SI notation?Numbers entered as a number from one to ten multiplied by a power of ten.
Correct Answer
C. Abbreviation of System International, a system of practical units based on the meter, kilogram, second, ampere, Kelvin, mole, and candela.
Explanation
SI notation refers to the abbreviation of System International, which is a system of practical units based on various fundamental quantities such as meter, kilogram, second, ampere, Kelvin, mole, and candela. This system provides a standardized and consistent way of measuring and expressing physical quantities.
2.
What's the best definition of a digital multimeter?
Correct Answer
B. A device to measure capacitance, inductance, current gain of transistors, and/or anything else that can be measured electronically.
Explanation
A digital multimeter is a device that is used to measure various electronic properties such as capacitance, inductance, and current gain of transistors. It is capable of measuring any electronic property that can be measured electronically.
3.
What's the best definition of a resistor?
Correct Answer
A. Component made of material that opposes flow of current.
Explanation
A resistor is a component made of material that opposes the flow of current. It is designed to have a specific resistance value, which determines the amount of current that can pass through it. Resistors are commonly used in electrical circuits to control the flow of current and to limit the amount of current that reaches certain components. They help to regulate voltage levels and protect sensitive electronic devices from damage caused by excessive current flow.
4.
What does LED stand for?
Correct Answer
D. Light Emitting Diode
Explanation
LED stands for Light Emitting Diode. This is a semiconductor device that emits light when an electric current is passed through it. LEDs are commonly used in various applications such as lighting, displays, and indicators due to their energy efficiency, long lifespan, and low power consumption.
5.
Express the number 469200000 in Scientific Notation.
Correct Answer
C. 4.692 x 10^8
Explanation
The number 469200000 can be expressed in scientific notation as 4.692 x 10^8. In scientific notation, the number is written as a decimal between 1 and 10 (in this case, 4.692) multiplied by 10 raised to a certain power (in this case, 8). This notation is used to represent very large or very small numbers more conveniently.
6.
Express the number 68100 Volts in Engineering Notation.
Correct Answer
B. 68.1 x 10^3 V
Explanation
The correct answer is 68.1 x 10^3 V. Engineering notation is used to express numbers in a more convenient and standardized format. In this case, the number 68100 volts is expressed as 68.1 x 10^3 V, where the decimal point is moved three places to the left and the exponent of 10 indicates the number of decimal places moved.
7.
Express the number 0.054 Amps in SI Notation.
Correct Answer
A. 54 mA
Explanation
The correct answer is 54 mA. This is because "mA" represents milliamperes, which is a unit of electric current in the International System of Units (SI). 54 mA is equivalent to 0.054 Amps.
8.
What is the value of a resistor with a color scheme of Brown, Green, Red, Silver?
(order from 0 to 9: black,brown,red,orange,yellow,green,blue,violet,gray,white)
Correct Answer
B. 1.5 kOhms +- 10%
Explanation
The color scheme of Brown, Green, Red corresponds to the values 1, 5, and 2 respectively. The fourth band, Silver, represents a multiplier of 0.01. Therefore, the value of the resistor can be calculated as (15 * 0.01) kOhms, which is equal to 0.15 kOhms or 150 Ohms. The tolerance of +-10% indicates that the actual value of the resistor can be 10% higher or lower than the stated value. So, the correct answer is 1.5 kOhms +- 10%.
9.
What is the value of a resistor with a color scheme of Green, Orange, Brown, Gold?
(order from 0 to 9: black,brown,red,orange,yellow,green,blue,violet,gray,white)
Correct Answer
D. 530 Ohms +- 5%
Explanation
The resistor with a color scheme of Green, Orange, Brown, Gold has a value of 530 Ohms with a tolerance of +- 5%. The first two bands, Green and Orange, represent the digits 5 and 3 respectively. The third band, Brown, represents the multiplier 10^1. The fourth band, Gold, represents the tolerance of +- 5%. Therefore, the resistor has a value of 53 * 10^1 Ohms, which simplifies to 530 Ohms. The tolerance of +- 5% indicates that the actual value of the resistor can vary by 5% from the stated value of 530 Ohms.
10.
Which of the following should be used to extinguish an electrical fire?
Correct Answer
C. Class C fire extinguisher
Explanation
A Class C fire extinguisher should be used to extinguish an electrical fire because it is specifically designed to handle fires involving energized electrical equipment. This type of extinguisher contains non-conductive agents that can safely smother the fire without conducting electricity, reducing the risk of electrocution. Using a Class A or Class B fire extinguisher on an electrical fire can be dangerous as it may cause the fire to spread or result in electric shock. Therefore, the correct choice is a Class C fire extinguisher.