1. Welcome to a valuable resource designed to enhance your HTET 2023 preparation and provide a solid grasp of the concept of magnetic flux through multiple-choice questions (MCQs). The Haryana Teacher Eligibility Test (HTET) is a significant milestone in your journey towards becoming a certified teacher in Haryana, and understanding fundamental concepts like magnetic flux is vital to your success. In this blog, we will dive into the world of magnetic flux, exploring its importance, key principles, and practical applications, all while bolstering your knowledge through carefully curated MCQs.
1. 1. What is magnetic flux?
A.
The number of magnetic
field lines passing through a closed surface
B.
The strength of a
magnetic field at a point in space
C.
The magnetic field
produced by a current-carrying wire
D.
The force experienced by
a magnetic material in a magnetic field
2. Which unit is commonly used to measure magnetic
flux?
A.
Weber (Wb)
B.
Tesla (T)
C.
Henry (H)
D.
Ohm (Ω)
3. According to Faraday's law of electromagnetic
induction, what is the relationship between the change in magnetic flux (ΔΦ)
through a coil and the induced electromotive force (EMF or ε)?
A.
ΔΦ ∝ ε
B.
ΔΦ = ε
C.
ΔΦ = ε/R
D.
ΔΦ ∝ 1/ε
4. If the magnetic field strength through a closed
loop increases, what happens to the magnetic flux through the loop?
A.
It decreases
B.
It remains the same
C.
It increases
D.
It becomes zero
5. What is the direction of the magnetic flux
through a closed surface when the magnetic field lines are perpendicular to the
surface?
A.
Zero
B.
Into the surface
C.
Out of the surface
D.
Along the surface
6. Which law states that the electromotive force
(EMF) induced in a closed circuit is equal to the rate of change of magnetic
flux through the circuit?
A.
Lenz's Law
B.
Gauss's Law for
Magnetism
C.
Faraday's Law of
Electromagnetic Induction
D.
Ohm's Law
7. If the angle between the magnetic field lines
and the normal to a surface is 60 degrees, what is the component of magnetic
field contributing to the magnetic flux?
A.
0.5 times the total
field
B.
0.866 times the total
field
C.
Equal to the total field
D.
Zero
8. What is the SI unit of magnetic field strength
(B)?
A.
Weber (Wb)
B.
Tesla (T)
C.
Ampere (A)
D.
Henry (H)
9. In which medium does magnetic flux travel most
effectively?
A.
Air
B.
Water
C.
Vacuum
D.
Iron
10. If the magnetic flux through a coil is 3 Weber
and the time taken for the change in flux is 0.5 seconds, what is the induced
electromotive force (EMF) according to Faraday's law?
A.
1.5 V
B.
3 V
C.
6 V
D.
0.5 V
11. Which of the following materials has the highest
magnetic permeability and is commonly used as a core in transformers and
inductors?
A.
Aluminum
B.
Copper
C.
Iron
D.
Plastic
12. If the magnetic field lines are parallel to the
surface of a closed loop, what is the magnetic flux through the loop?
A.
Maximum
B.
Minimum
C.
Zero
D.
Indeterminate
13. According to Lenz's Law, what is the direction
of the induced current in a conductor when the magnetic flux through it
decreases?
A.
In the same direction as
the change in flux
B.
In the opposite
direction of the change in flux
C.
In a random direction
D.
It depends on the
material of the conductor
14. What is the formula to calculate the magnetic
flux (Φ) through a surface with magnetic field strength (B) and surface area
(A) when the magnetic field is perpendicular to the surface?
A.
Φ = B × A
B.
Φ = B / A
C.
Φ = B - A
D.
Φ = B + A
15. In a solenoid (a long coil of wire), how can you
increase the magnetic flux through it?
A.
Increase the number of
turns (N) of the coil
B.
Decrease the current (I)
flowing through the coil
C.
Decrease the length (L)
of the coil
D.
Decrease the number of
turns (N) of the coil
16. When the angle between the magnetic field lines
and the normal to a surface is 90 degrees, what is the component of magnetic
field contributing to the magnetic flux?
A.
Zero
B.
Half of the total field
C.
Equal to the total field
D.
Twice the total field
17. What is the unit of magnetic flux density?
A.
Weber (Wb)
B.
Tesla (T)
C.
Henry (H)
D.
Ampere (A)
18. When a magnet is moved farther away from a
closed loop of wire, what happens to the induced electromotive force (EMF) in
the loop, assuming all other factors remain constant?
A.
It increases
B.
It decreases
C.
It remains the same
D.
It becomes zero
19. What is the magnetic flux through a closed
surface when the magnetic field lines are parallel to the surface and pointing
outwards?
A.
Maximum positive flux
B.
Maximum negative flux
C.
Zero flux
D.
Negative flux
20. In an electromagnetic induction experiment, if the
rate of change of magnetic flux is doubled, how does it affect the induced
electromotive force (EMF) in the coil?
A.
It becomes half
B.
It becomes four times
C.
It becomes twice
D.
It remains the same
A. Φ = B × A × Î¸
B. Φ = B / A × Î¸
C. Φ = B × A × cos(θ)
D. Φ = B - A × Î¸
22. Which of the following factors does not affect the magnetic flux through a closed loop?
A. The strength of the magnetic field
B. The surface area of the loop
C. The number of turns in the loop
D. The temperature of the loop material
23. In which direction does the magnetic field point inside a permanent magnet?
A. Away from the north pole and towards the south pole
B. Away from the south pole and towards the north pole
C. Only towards the north pole
D. Only towards the south pole
24. What is the unit of magnetic flux linkage (NΦ) when the number of turns (N) and magnetic flux (Φ) are given in their respective units?
A. Weber (Wb)
B. Weber-turns (Wb·turn)
C. Tesla (T)
D. Ampere (A)
25. In an electromagnetic induction experiment, if the magnetic field strength (B) is increased while the rate of change of magnetic flux remains constant, what happens to the induced electromotive force (EMF) in the coil?
A. It increases
B. It decreases
C. It remains the same
D. It becomes zero
26. What is the magnetic permeability of free space (a vacuum)?
A. 1 Wb
B. 1 T
C. 1 H/m
D. 1 A/m
27. Which law states that the electromotive force (EMF) induced in a closed loop is directly proportional to the rate of change of magnetic flux through the loop?
A. Lenz's Law
B. Gauss's Law for Magnetism
C. Ampere's Law
D. Faraday's Law of Electromagnetic Induction
28. In a transformer, if the number of turns in the primary coil is greater than the number of turns in the secondary coil, what happens to the voltage in the secondary coil compared to the voltage in the primary coil?
A. It is greater
B. It is less
C. It is the same
D. It depends on the material of the coils
29. What is the primary function of the core material in a transformer?
A. To store energy
B. To increase the number of turns in the coils
C. To provide mechanical support
D. To enhance magnetic coupling between the coils
30. Which of the following materials is generally used as a core in high-frequency transformers and inductors due to its high magnetic permeability?
A. Copper
B. Plastic
C. Air
D. Ferrite
31. What is the relationship between magnetic flux (Φ) and the magnetic field strength (B), surface area (A), and the angle (θ) between the field lines and the normal to the surface of a loop?
A. Φ = B × A × Î¸
B. Φ = B / A × Î¸
C. Φ = B × A × cos(θ)
D. Φ = B + A × Î¸
32. In which direction do the magnetic field lines inside a current-carrying wire point?
A. Along the wire in the direction of the current
B. Away from the wire
C. Towards the wire
D. Radially outward from the wire
33. What is the unit of magnetic flux density?
A. Weber (Wb)
B. Tesla (T)
C. Henry (H)
D. Ampere (A)
34. According to Lenz's Law, what is the direction of the induced current in a conductor when the magnetic flux through it increases?
A. In the same direction as the change in flux
B. In the opposite direction of the change in flux
C. In a random direction
D. It depends on the material of the conductor
35. Which law states that the electromotive force (EMF) induced in a closed loop is directly proportional to the rate of change of magnetic flux through the loop and its direction is such that it opposes the change in flux?
A. Lenz's Law
B. Gauss's Law for Magnetism
C. Ampere's Law
D. Faraday's Law of Electromagnetic Induction
36. What is the primary purpose of the core material in an electromagnet?
A. To store energy
B. To provide mechanical support
C. To enhance the magnetic field strength
D. To regulate current flow
37. Which of the following materials exhibits strong magnetic behavior and is used in the construction of permanent magnets?
A. Aluminum
B. Copper
C. Iron
D. Plastic
38. If the magnetic field strength (B) is doubled while the surface area (A) remains constant, what happens to the magnetic flux (Φ) through the surface?
A. It doubles
B. It halves
C. It remains the same
D. It depends on the angle (θ)
39. What is the formula for calculating the magnetic flux linkage (NΦ) through a coil with the number of turns (N), magnetic flux (Φ), and angle (θ) between the field lines and the normal to the coil surface?
A. NΦ = N × Î¦ × Î¸
B. NΦ = N / Φ × Î¸
C. NΦ = N × Î¦ × cos(θ)
D. NΦ = N + Φ × Î¸
40. In a transformer, if the primary coil has 100 turns and the secondary coil has 200 turns, what is the relationship between the voltage in the secondary coil and the voltage in the primary coil?
A. The secondary voltage is half of the primary voltage.
B. The secondary voltage is double the primary voltage.
C. The secondary voltage is the same as the primary voltage.
D. The relationship depends on the core material.
In conclusion, magnetic flux is a critical topic for
HTET 2023, and MCQs can be your best friend in mastering this concept
effectively. Regular practice and thorough understanding are key to excelling
in the examination. Use these MCQs not just as a study tool but as a means to
deepen your comprehension and reinforce your knowledge. With diligent
preparation and a focus on magnetic flux, you can boost your confidence and
performance in HTET 2023, bringing you one step closer to achieving your dream
of becoming a certified teacher in Haryana. Best of luck in your preparation
journey!
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