Voltage_ Current And Resistance MCQs with Explanations

The question asks us to find the amount of charge (in coulombs) that flows through a lamp filament given the current and time. Remember the fundamental relationship between current (I), charge (Q), and time (t): I = Q/t Where: I is the current in Amperes (A) Q is the charge in Coulombs (C) t is the time in seconds (s) We are given: Current, I = 6 A Time, t = 1.75 s We need to find Q. Rearranging the formula to solve for Q, we get: Q = I * t Substitute the given values: Q = 6 A * 1.75 s Q = 10.5 C Therefore, the correct answer is Option A: 10.5 C .

Atomic Number: The atomic number of an element tells you how many protons are in the nucleus of an atom of that element. Neutral Atom: A neutral atom means the atom has no overall electrical charge . Protons and Electrons: Protons have a positive charge (+) , and electrons have a negative charge (-) . Balancing the Charges: For an atom to be neutral, the number of positive charges (protons) must equal the number of negative charges (electrons). Therefore: If an atom has an atomic number of five, it has five protons. To be neutral, it must also have five electrons to balance out the positive charge of the protons.

A material that does not allow current under normal conditions is called an insulator . Insulator: Insulators are materials that do not allow the flow of electric current under normal conditions. They have very high resistance, which prevents the free flow of electrons. Common examples include rubber, plastic, and glass. Conductor: Conductors are materials that allow the flow of electric current easily. These materials have low resistance, and electrons can move freely. Examples include metals like copper and aluminum. Semiconductor: Semiconductors are materials that have conductivity between that of insulators and conductors. Under certain conditions, such as applying voltage or heat, they can conduct electricity. Silicon is a common semiconductor. Valence: This term refers to the electrons in the outermost shell of an atom, which are involved in bonding and conduction, but it does not describe a type of material. Therefore, the correct answer is Option A: Insulator because it is the material that does not allow current under normal conditions.

125 mS is the correct answer to “The conductance of an 8 ohm resistance is”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

True is the correct answer to “Resistance limits the current.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Current, voltage, and resistance is the correct answer to “A multimeter measures”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

6,120 Ω is the correct answer to “The minimum resistance value for a blue, gray, red, silver resistor is”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Repel is the correct answer to “When placed close together, two positively charged materials will”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Resettable protective device is the correct answer to “A circuit breaker is a”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Conductors is the correct answer to “Materials with lots of free electrons are called”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Yellow, violet, red, silver is the correct answer to “The colored bands for a 4,700 ohm resistor with a ten percent tolerance are”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

True is the correct answer to “Free electrons make current possible.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

False is the correct answer to “A potentiometer is a twoterminal variable resistor.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

24 A is the correct answer to “The current in a given circuit is not to exceed 24 A. Which value of fuse is best”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Current is the correct answer to “An ammeter is an electrical instrument used to measure”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

False is the correct answer to “An open circuit is one that has a complete current path.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

True is the correct answer to “A neutral atom is one with an equal number of protons and electrons.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

126,000 Ω is the correct answer to “The maximum resistance value for a brown, red, yellow, gold resistor is”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Rheostat is the correct answer to “Which of the following is not a type of energy source”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Resistor is the correct answer to “A thermistor is a type of”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

True is the correct answer to “A free electron is a valence electron that has broken away from its parent atom.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

False is the correct answer to “The atomic number is the number of neutrons in the nucleus.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Resistance is the correct answer to “An ohmmeter is an instrument for measuring”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

22,000 Ω is the correct answer to “A red, red, orange, gold resistor has a nominal value of”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Rheostat is the correct answer to “A twoterminal variable resistor is known as a”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Potentiometer is the correct answer to “A wiper is the sliding contact in a”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

0.5 C is the correct answer to “When the current is 2.5 A, how many coulombs pass a point in 0.2 s”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

False is the correct answer to “An ammeter is connected across the current path.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

True is the correct answer to “A voltmeter is connected across the current path.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Valences is the correct answer to “Electrons in the outer orbit are called”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

True is the correct answer to “The nominal value of a brown, black, yellow, and gold resistor is 100,000 ohms.”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

Coulomb is the correct answer to “The unit of electrical charge is the”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

0.2 A is the correct answer to “Eighttenths coulomb passes a point in 4 s. The current in amperes is”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.

A switch is closed is the correct answer to “Current flows in a circuit when”. This question is standard in competitive examination syllabi for Voltage_ Current And Resistance.