Physics: Practice Questions On Electric Currents And Force!
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Questions and Answers
- 1.
Ohm's law states that the current flowing through a piece of metal is proportional to the potential differnce across it, if ...
- A.
Resistance is constant
- B.
Pressure is constant
- C.
Cross-sectional area is constant
- D.
Temperature is constant
Correct Answer
D. Temperature is constantExplanation
According to Ohm's law, the current flowing through a piece of metal is proportional to the potential difference across it, if the temperature is constant. This means that as long as the temperature remains the same, the current will increase or decrease in direct proportion to the potential difference. The other factors mentioned (resistance, pressure, and cross-sectional area) may also affect the current, but they are not mentioned in the question as being constant. Therefore, the correct answer is that the temperature must be constant for Ohm's law to hold true.Rate this question:
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- 2.
"A current that flows in just one direction is known as a [...]"
Correct Answer
direct currentExplanation
A current that flows in just one direction is known as direct current. Direct current (DC) is the flow of electric charge in a constant direction, typically generated by batteries or power supplies. Unlike alternating current (AC), which periodically changes direction, direct current maintains a steady flow of electrons in a single direction. DC is commonly used in electronics, such as powering electronic devices and charging batteries.Rate this question:
- 3.
One [...] of negative charge is the chrage carried by a total of 6.25 * 10^18 electrons
Correct Answer
coulombExplanation
The given statement explains that one coulomb of negative charge is equivalent to the charge carried by 6.25 * 10^18 electrons. This means that if we have a total of 6.25 * 10^18 electrons, their combined charge would be equal to one coulomb. The coulomb is the unit of electric charge in the International System of Units (SI).Rate this question:
- 4.
A current that constantly changes direction is known as
- A.
Changing current
- B.
Variable current
- C.
Variable resistor
- D.
Alternating current
Correct Answer
D. Alternating currentExplanation
An alternating current is a type of current that constantly changes direction. Unlike direct current, which flows in only one direction, alternating current periodically reverses direction. This is achieved through the use of an alternating voltage source, such as an AC generator. Alternating current is commonly used in homes and businesses for powering electrical devices, as it can be easily transmitted over long distances and efficiently transformed into different voltage levels.Rate this question:
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- 5.
A conventional current flows from ...
- A.
Positive to negative
- B.
Negative to positive
Correct Answer
A. Positive to negativeExplanation
A conventional current flows from positive to negative because it is based on the historical convention established before the discovery of electrons. This convention assumes that current flows from the positive terminal of a power source to the negative terminal. However, in reality, electrons flow in the opposite direction, from negative to positive. Nonetheless, the conventional current flow is still widely used in circuit analysis and electrical engineering.Rate this question:
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- 6.
The potential difference between two points is the energy difference per unit distance moved.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
It is the energy difference per unit charge moved.Rate this question:
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- 7.
The speed of electrons due to the current is called their [...] velocity
Correct Answer
driftExplanation
The speed of electrons due to the current is called their drift velocity. This term refers to the average velocity at which electrons move in a conductor when an electric field is applied. It is important to note that the drift velocity is much slower compared to the speed of individual electrons. The drift velocity is influenced by factors such as the magnitude of the electric field, the density of free electrons in the conductor, and the cross-sectional area of the conductor.Rate this question:
- 8.
A device with constant resistance is known as a(n) ...
Correct Answer
resistorExplanation
A device with constant resistance is known as a resistor. A resistor is an electronic component that restricts the flow of electric current in a circuit. It is designed to have a specific resistance value, which remains constant regardless of the voltage or current passing through it. Resistor is a fundamental component used in various electrical and electronic systems to control the flow of electricity and to provide stability and protection to other components in the circuit.Rate this question:
- 9.
The rate of flow of eletrical charge is the definition of ...
- A.
Wave
- B.
Ray
- C.
Circuit
- D.
Current
Correct Answer
D. CurrentExplanation
The rate of flow of electrical charge is defined as current. Current refers to the flow of electric charge in a circuit or conductor. It is measured in amperes (A) and is essential for the functioning of electrical devices.Rate this question:
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- 10.
So, current is the name for moving charges, and the path they follow is called the [...]
Correct Answer
circuitExplanation
The explanation for the given correct answer is that a circuit refers to the complete path that the moving charges, or current, follows. It includes all the components such as wires, resistors, capacitors, and other electrical devices that are connected together to form a closed loop. The circuit allows the flow of electric current from the power source to the load and back to the source, enabling the transfer of energy and the operation of electrical devices.Rate this question:
- 11.
A perfect ammeter has infinite resistance
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A perfect ammeter has zero resistance (a perfect voltmeter has infinite resistance)Rate this question:
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- 12.
The total energy difference per unit charge around a circuit is called the
- A.
Internal energy
- B.
Electromotive force (e.m.f.)
- C.
Internal resistance
- D.
Drawn
Correct Answer
B. Electromotive force (e.m.f.)Explanation
The electromotive force (e.m.f.) is the total energy difference per unit charge around a circuit. It represents the potential difference or voltage that drives the flow of electric current in a circuit. The e.m.f. is responsible for creating an electric field that pushes the charges and maintains the current flow. It is measured in volts and is independent of the circuit's internal resistance.Rate this question:
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- 13.
In a series circuit, the charges are allowed more than one possible route around the circuit
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
A parallel circuit is branched as such. A series circuit, however, has components conected one after another in a continuous chain.Rate this question:
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- 14.
A variable potential divider (when two resistors "divide up" the potential difference of the battery) is known as a(n)
Correct Answer
potentiometerExplanation
A potentiometer is a variable potential divider that is used to divide up the potential difference of a battery. It consists of two resistors that can be adjusted to vary the output voltage. By changing the position of the sliding contact, the resistance ratio between the two resistors can be changed, thereby changing the output voltage. This allows for precise control and measurement of voltage in various electrical circuits. Therefore, a variable potential divider is commonly known as a potentiometer.Rate this question:
- 15.
A resistor whose value of resistance depends on its temperature is known as a(n)
- A.
Light dependent resistor
- B.
Strain gauge
- C.
Thermistor
- D.
Negative temperature coefficient (NTC)
Correct Answer
C. ThermistorExplanation
A thermistor is a type of resistor whose resistance changes with temperature. It is designed to have a high sensitivity to temperature variations, making it useful in applications where temperature monitoring or control is required. The resistance of a thermistor decreases as the temperature increases, and vice versa. This characteristic allows thermistors to be used in temperature sensing and compensation circuits, as well as in temperature control systems. Therefore, a resistor whose value of resistance depends on its temperature is known as a thermistor.Rate this question:
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- 16.
What is a strain gauge?
- A.
A device whose resistance depends on the amount of light shining through its surface
- B.
A device whoe output voltage depnds on any extension or compression resulting from a change of length
- C.
A device whose value of resistance depends on its temperature
- D.
A circuit which has an output potential difference that depends on an external factor
Correct Answer
B. A device whoe output voltage depnds on any extension or compression resulting from a change of lengthExplanation
(A) defines a light dependent resistor (LDR). (C) defines a thermistor. (D) defines a sensor circuitRate this question:
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- 17.
"Every mass in the Universe attracts all other masses in the Universe" This is the fundamental statement of Newton's theory of [...]
Correct Answer
universal gravitationExplanation
Newton's theory of universal gravitation states that every mass in the Universe attracts all other masses in the Universe. This means that any two objects with mass will exert a gravitational force on each other. The strength of this force depends on the masses of the objects and the distance between them. This theory explains why objects fall to the ground, why planets orbit the Sun, and why galaxies are held together. It is a fundamental concept in physics and has been widely accepted since its formulation by Sir Isaac Newton in the 17th century.Rate this question:
- 18.
Matter that contains no charge, or equal amounts of positive and negative charge, is said to be electrically [...]
Correct Answer
neutralExplanation
Matter that contains no charge, or equal amounts of positive and negative charge, is said to be electrically neutral. This means that the total positive charge of the matter is equal to the total negative charge, resulting in a net charge of zero. In other words, there is a balance between positive and negative charges, making the matter neither positively nor negatively charged.Rate this question:
- 19.
What is a conductor?
- A.
A material that allows the flow of charge through it
- B.
A material through which a charge cannot flow
- C.
A material with infinite internal resistance
- D.
The point charge within an electric field
Correct Answer
A. A material that allows the flow of charge through itExplanation
(B) defines an insulator.Rate this question:
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- 20.
The force that exists between all charges is known as the ...
Correct Answer
electrostatic forceExplanation
The force that exists between all charges is known as the electrostatic force. This force is responsible for the interaction between electrically charged particles, such as protons and electrons. It is a fundamental force in nature and plays a crucial role in many phenomena, including the behavior of atoms, the flow of electricity, and the formation of lightning. The electrostatic force can be attractive or repulsive, depending on the charges involved and their distances from each other. It is described by Coulomb's law, which states that the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.Rate this question:
- 21.
Electric field is the force per unit charge on a negative test charge
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
Electric field is the force per unit charge on a positive test chargeRate this question:
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- 22.
The lines of a magnetic field are also called ...
- A.
Magnetic lines
- B.
Field lines
- C.
Flux lines
- D.
Magnelines
Correct Answer
C. Flux linesExplanation
The lines of a magnetic field are also called flux lines. This term is commonly used to describe the visual representation of the magnetic field, showing the direction and strength of the field at different points. These lines help us understand the behavior and properties of magnetic fields and are used in various applications, such as in magnetic field mapping and analysis.Rate this question:
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- 23.
"When a current-carrying wire is placed in a magnetic field, the magnetic interaction between the two results in a force" What is being defined?
- A.
Electrostatic effect
- B.
Magnetic effect
- C.
Motor effect
- D.
Electric effect
Correct Answer
C. Motor effectExplanation
The correct answer is Motor effect. The explanation for this is that when a current-carrying wire is placed in a magnetic field, the interaction between the magnetic field and the current in the wire creates a force. This force is known as the motor effect and is the basis for the operation of electric motors.Rate this question:
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