intro
Question 1:
What is the best representation of a CRO?
Topic: Electronic Devices
Correct Answer: B) TV Picture tube
- CRO stands for Cathode Ray Oscilloscope. It's a device that is used to analyze waveform and other electronic signals.
- Among the options provided, the best representation for a CRO is a TV Picture tube.
- Both utilize the concept of directing a beam of electrons towards a screen to create illumination.
- Therefore, the correct answer is B, "TV Picture tube".
Question 2:
What does a galvanometer coil transform into when a high resistance is connected in series with it?
Topic: Electronic Measurement Devices
Correct Answer: A) Voltmeter
- A high resistance connected in series to the coil of a galvanometer results in the conversion of the galvanometer into a voltmeter.
- The voltmeter measures the potential difference across any two points in an electronic circuit.
- Hence, the correct answer is A, "Voltmeter".
Question 3:
When the current in two parallel long wires doubles and the distance between the wires triples, what is the new force per unit length?
Topic: Electromagnetism
Correct Answer: D) 4F/3
- The force between two parallel wires is directly proportional to the product of their currents and inversely proportional to the distance between them.
- When the current is doubled and the separation is tripled, the new force per unit length is 4F/3.
- Therefore, the correct answer is D, "4F/3".
Question 4:
Given the direction of current in a conductor, which way will conductor "B" move?
Topic: Electric Current
Correct Answer: A) Left
- In a magnetic field, the direction of a conductor's movement depends on the current flowing through it.
- In this case, given the current's direction, conductor "B" will move in the left direction.
- Thus, the correct answer is A, "Left".
Question 5:
What characteristic should an ideal voltmeter possess?
Topic: Electronic Measurement Devices
Correct Answer: B) Infinite resistance
- An ideal voltmeter is one that does not alter the circuit it is measuring.
- Therefore, it should have infinite resistance to prevent current flow through it and ensure all current passes through the connected resistance.
- This allows for accurate voltage measurement across the component.
- Hence, the correct answer is B, "Infinite resistance".
Question 6:
What is the magnetic field along the axis of a solenoid carrying a current 'I' and having 'N' turns?
Topic: Electromagnetism
Correct Answer: A) Option A
- The magnetic field along the axis of a solenoid is determined by its number of turns and the current flowing through it.
- Without specific values or formulas for the options, the correct answer according to the original question is A, "Option A".
Question 7:
When electrons circle counterclockwise, what is the direction of the magnetic field they produce at the center of the circle?
Topic: Electromagnetism
Correct Answer: A) Into the page
- Electrons moving in a counterclockwise direction behave like a single current-carrying loop.
- Using the right-hand grip rule, the direction of the magnetic field inside the loop is determined to be into the page.
- Therefore, the correct answer is A, "Into the page".
Question 8:
How is the charge-to-mass ratio (e/m) of a proton compared to that of an electron?
Topic: Particle Physics
Correct Answer: C) Less than that of an electron
- The charge-to-mass ratio (e/m) is a characteristic property of a charged particle.
- This ratio for a proton is less than that for an electron.
- So, the correct answer is C, "Less than that of an electron".
Question 9:
What is the magnitude of force experienced by a current-carrying conductor oriented at right angles to a magnetic field?
Topic: Electromagnetism
Correct Answer: C) ILB
- The force experienced by a current-carrying conductor, perpendicular to a magnetic field, is given by the formula F = ILBsinθ.
- As the conductor is perpendicular, θ = 90° making sin90° = 1.
- Therefore, the force F = ILB.
- So, the correct answer is C, "ILB".
Question 10:
What is the strength of the magnetic field that produces a peak force of 7.0×10-3N on a 20.0cm conductor carrying an electric current of 10.0A?
Topic: Electromagnetism
Correct Answer: A) 3.5×10-3T
- The force on a current-carrying conductor in a magnetic field is given by F = ILB.
- To find the magnetic field strength 'B', rearrange the formula as B = F / (IL).
- Substituting the given values, we find B = 3.5×10-3T.
- Thus, the correct answer is A, "3.5×10-3T".
Question 11:
What does Ampere's Circuital Law allow us to determine in relation to a conductor carrying current?
Topic: Electromagnetism
Correct Answer: D) All of the above
- Ampere's Circuital Law is a fundamental formula in electromagnetism that can be used to calculate the magnetic field associated with a given current distribution.
- It encompasses the computation of magnetic field strength, magnetic flux density, and magnetic induction around a current-carrying wire.
- Consequently, the correct answer is D, "All of the above".
Question 12:
The product of the current and the permeability of free space is equal to the dot product of magnetic field "B" and length "L" around any closed path.
Topic: Electromagnetism
Correct Answer: D) Ampere's Circuital Law
- The statement describing the relationship between the dot product of B and L, and the product of the current and the permeability of free space, refers to Ampere's Circuital Law.
- This law provides a method to calculate the magnetic field produced by an electric current.
- So, the correct answer is D, "Ampere's Circuital Law".
Question 13:
How would you describe the magnetic field along the axis inside a solenoid due to the current passing through it?
Topic: Electromagnetism
Correct Answer: D) Strong and uniform
- The magnetic field generated by a solenoid, that is a coil of wire, is essentially uniform and strong along its center or core.
- Since the solenoid is tightly wound, the field inside is uniform and directed along the solenoid's axis, while it is considerably weaker outside.
- Therefore, the correct answer is D, "Strong and uniform".
Question 14:
What is the nature of the path referred to as the Amperean path?
Topic: Electromagnetism
Correct Answer: C) Closed path
- The Amperean path refers to the path over which Ampere's Circuital Law is applied.
- This path is always closed in nature, encompassing the current that creates the magnetic field.
- Hence, the correct answer is C, "Closed path".
Question 15:
Which among the following is a scalar property?
Topic: Electromagnetism
Correct Answer: C) Magnetic Flux
- Among the options given, a scalar quantity is one that only has magnitude and not direction.
- Scalar quantities have a magnitude but no specific direction, such as magnetic flux.
- Therefore, the correct answer is C, "Magnetic Flux".
Question 16:
What is the value of the permeability of free space, "μo", in S.I units?
Topic: Electromagnetism
Correct Answer: D) 4π × 10-7WbA-1m-1
- The permeability of free space, "μo", is a constant which signifies the ability of a vacuum to permit magnetic field lines.
- In the S.I unit system, the value of "μo" is 4π × 10-7 WbA-1m-1.
- So, the correct answer is D, "4π × 10-7WbA-1m-1".
Question 17:
Another term for a shunt resistor is?
Topic: Electromagnetism
Correct Answer: A) Bypass resistor
- A shunt resistor, often used in electric and electronic circuits, has another name.
- It is also referred to as a Bypass resistor, indicating that it allows the current to pass or "bypass" around another point in the circuit.
- So, the correct answer is A, "Bypass resistor".
Question 18:
How can the magnetic density at a specific location due to a current-carrying conductor be calculated?
Topic: Electromagnetism
Correct Answer: A) Ampere’s Law
- The magnetic density at a point, due to a current-carrying conductor, can be analyzed and determined through certain principles.
- Ampere’s Law is the suitable method for estimating magnetic density in such a situation.
- Hence, the correct answer is A, "Ampere’s law".
Question 19:
Alpha particles are subjected to a velocity selector where electric and magnetic fields are at right angles to each other with strengths of 200Vm-1 and 0.4T respectively. What should be their velocity to traverse the region without deviation?
Topic: Electromagnetism
Correct Answer: C) 500 m/s
- In a velocity selector, alpha particles move through a region with perpendicular electric and magnetic fields.
- The velocity that allows them to pass without deviation can be calculated using the ratio of electric field strength to magnetic field strength.
- Thus, the correct answer is C, "500 m/s".
Question 20:
What is the numerical value of the permeability of free space, represented as "μ0", in the S.I. unit system?
Topic: Electromagnetism
Correct Answer: B) 4×10-7 WbA-1m-1
- The permeability of free space, denoted as "μ0", is a constant that is fundamental to the study of electromagnetism.
- In the S.I. unit system, its numerical value is 4×10-7 WbA-1m-1.
- Consequently, the correct answer is B, "4×10-7 WbA-1m-1".
Question 21:
What is the result of subjecting a magnet to elevated temperatures?
Topic: Electromagnetism
Correct Answer: D) It loses its magnetism.
- Subjecting a magnet to high temperatures can have a significant effect on its magnetic properties.
- Typically, heating a magnet beyond its Curie point, which is usually around 800°C, disrupts the long-range order and causes it to lose its magnetism.
- Hence, the correct answer is D, "It loses its magnetism".
Question 22:
What is the unit of the permeability of free space?
Topic: Electromagnetism
Correct Answer: A) Tesla meter per ampere (Tm/A)
- The unit of the permeability of free space, represented as "μ0", is crucial in electromagnetic calculations.
- In the S.I. unit system, it is measured in Tesla meter per ampere (Tm/A).
- Therefore, the correct answer is A, "Tesla meter per ampere (Tm/A)".
Question 23:
In a uniform magnetic field, when does a straight conductor carrying current experience the maximum force?
Topic: Electromagnetism
Correct Answer: B) When it is aligned perpendicular to the field.
- The force experienced by a current-carrying conductor in a uniform magnetic field is determined by its alignment with the magnetic field.
- The force is maximum when the conductor is positioned perpendicular to the magnetic field.
- Thus, the correct answer is B, "When it is aligned perpendicular to the field".
Question 24:
Two conductors, carrying currents of 2A and 4A respectively, are kept parallel to each other at a distance of 4cm. What is the nature and magnitude of the force per unit length exerted by one wire on the other?
Topic: Electromagnetism
Correct Answer: C) 1×10-3 N/m, attractive.
- When two parallel conductors carry current in the same direction, they exert an attractive force on each other.
- The magnitude of this force per unit length can be calculated using given values of distance and current.
- Therefore, the correct answer is C, "1×10-3 N/m, attractive".
Question 25:
Which device is recognized as a low-resistance galvanometer?
Topic: Electromagnetism
Correct Answer: A) Ammeter
- A galvanometer with low resistance is typically used for certain specific measurements in electrical circuits.
- Among the given options, the Ammeter is known as a low-resistance galvanometer.
- As a result, the correct answer is A, "Ammeter".
Question 26:
What is the pattern of the magnetic field lines generated by a current flowing through a long, straight wire?
Topic: Electromagnetism
Correct Answer: A) Concentric circles around the wire.
- current-carrying 'wire' produces a magnetic field that adopts a certain configuration.
- The pattern is of concentric circles formed around the wire.
- Hence, the correct answer is A, "Concentric circles around the wire".
Question 27:
Which geometric shape best describes the magnetic field surrounding a wire carrying a continuous current?
Topic: Electromagnetism
Correct Answer: D) Circular.
- The magnetic field of a wire with a consistent current flow adopts a certain shape.
- This shape is circular, as per the right-hand thumb rule.
- Therefore, the correct answer is D, "Circular".
Question 29:
Who was the first to discover the existence of a magnetic field surrounding a conductor carrying an electric current?
Topic: Electromagnetism
Correct Answer: A) Hans Oersted
- The discovery of the magnetic field around an electrically charged conductor marked a significant milestone in electromagnetism.
- This groundbreaking discovery was made by Hans Oersted.
- Therefore, the correct answer is A, "Hans Oersted".
Question 30:
A wire with a length of 20.0cm is carrying a 10.0A current. It is placed in a magnetic field of strength 0.30T. Given that the wire forms an angle of 30o with the magnetic field, what is the magnitude of the force acting on it?
Topic: Electromagnetism
Correct Answer: B) 0.3N
- The formula F = IlB*sin(θ) may be used to determine the force felt by a wire carrying current in a magnetic field. In this formula, I stands for current, l for wire length, B for magnetic field intensity, and θ for the angle between the wire and field.
- Substituting the provided values into the formula, we find that the force is 0.3N.
- Hence, the correct answer is B, "0.3N".
MCQs 31:
Assume a wire is carrying a large current “I” from east to west and is placed over a simple magnetic compass. Which direction will the compass needle marked “N” point towards?
Topic: Electromagnetism
Correct Answer: B) South
- A magnetic field produced by a wire carrying electricity can change the direction of a nearby compass needle.
- When a wire carrying current from east to west is placed over a compass, the north-marked end of the needle will point towards the south.
MCQs 32:
What device does a galvanometer coil transition into when connected in parallel with an appropriate small resistance?
Topic: Electromagnetism
Correct Answer: C) Ammeter
- By connecting a galvanometer in parallel with a modest resistance, it is possible to convert it into an ammeter.
- An ammeter must have a low resistance to avoid disturbing the current it is connected to in series.
MCQs 33:
In what manner should an ammeter be connected to a circuit to measure the total current flow accurately?
Topic: Electromagnetism
Correct Answer: A) Series connection with the circuit
- An ammeter is designed to measure the total current flowing through a circuit.
- For accurate reading, it should be connected in series with the circuit, not in parallel.
Question 34:
In a magnetic field, a current-carrying wire experiences a force. What is the direction of this force?
Topic: Electromagnetism
Correct Answer: C) Point C
- The direction of the force experienced by a current-carrying wire in a magnetic field can be determined using the right-hand rule.
- Align your fingers with the magnetic field lines (toward the South Pole), and your thumb along the direction of the current. Your palm will point towards the direction of the force.
- With this method, you can confirm the force direction is towards Point C. Therefore, the correct answer is C, "Point C".
Question 35:
Per Ampere's Law, what is the effect on the magnetic field when the current is amplified?
Topic: Electromagnetism
Correct Answer: A) It increases
- Ampere's Law states that the magnetic field an electric current produces is directly correlated with the current's magnitude.
- This means that as the current increases, the magnetic field will also increase.
- Therefore, the correct answer is A, "It increases".
Question 36:
According to Ampere's Law, the strength of an electric current is directly linked to the magnetic field it creates.
Topic: Electromagnetism
Correct Answer: B) 1/R
- A long, straight wire carrying electricity produces a magnetic field that is smaller the farther away it is from the wire.
- This relationship is described by an inversely proportional relationship, specifically 1/R where R is the distance from the wire.
- Hence, the correct answer is B, "1/R".
Question 37:
When an area plane makes a certain angle with a magnetic field, the magnetic flux passing through that area will be 1/√2 times the maximum flux. What is this angle?
Topic: Electromagnetism
Correct Answer: B) 45°
- The magnetic flux through a surface is a measure of the total magnetic field passing through that surface.
- When the plane makes an angle of 45° with the magnetic field, the magnetic flux is 1/√2 times the maximum flux.
- Therefore, the correct answer is B, "45°".
Question 38:
The illustration represents a wire that carries an electronic current I, positioned between the poles of a magnet. In which direction does the wire experience force?
Topic: Electromagnetism
Correct Answer: A) Into the paper
- The force that a wire carrying current experiences in a magnetic field is calculated using the Right Hand Rule, which takes into account both the direction of the current and the direction of the magnetic field.
- In this case, the force is directed into the paper, as suggested by the right-hand rule.
- Therefore, the correct answer is A, "Into the paper".
Question 39:
Given that the magnetic field at a distance of 2cm from a long straight wire carrying a current equals 2.0×10-5T, what is the current running through the wire?
Topic: Electromagnetism
Correct Answer: C) 2.0A
- Ampere's law, which states that the magnetic field is proportional to the current in the wire and inversely proportional to the distance from the wire, can be used to calculate the magnetic field surrounding a current-carrying wire.
- In this scenario, by substituting the given values into the equation derived from Ampere's law, we find the current to be 2.0A.
- Therefore, the correct answer is C, "2.0A".
Question 40:
To extend the range of an ammeter, what should be altered in relation to the shunt value?
Topic: Electromagnetism
Correct Answer: A) Decrease the shunt value
- The range of an ammeter can be increased by adjusting the shunt resistance, which is a small resistance connected in parallel with the ammeter to allow measurement of larger currents.
- Reducing the shunt resistance value enables higher currents to be measured without overloading the ammeter.
- Consequently, the correct answer is A, "Decrease the shunt value".