Q. In a Zener diode, what is the purpose of the reverse breakdown region? (2020)
A.
To increase voltage
B.
To regulate voltage
C.
To decrease current
D.
To store energy
Show solution
Solution
The reverse breakdown region in a Zener diode allows it to regulate voltage by maintaining a constant output voltage.
Correct Answer:
B
— To regulate voltage
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Q. In an AC circuit, if the current lags the voltage by 30 degrees, what is the power factor? (2023)
A.
0.866
B.
0.5
C.
1
D.
0.707
Show solution
Solution
The power factor (PF) is given by cos(θ). If θ = 30 degrees, PF = cos(30°) = √3/2 ≈ 0.866.
Correct Answer:
A
— 0.866
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Q. In an AC circuit, if the power factor is 0.5, what is the angle φ between the voltage and current? (2019)
A.
30 degrees
B.
60 degrees
C.
90 degrees
D.
45 degrees
Show solution
Solution
The power factor (cosφ) is 0.5, which corresponds to an angle φ of 60 degrees.
Correct Answer:
B
— 60 degrees
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Q. In an AC circuit, if the voltage is given by V(t) = V0 sin(ωt), what is the expression for the current if the circuit is purely inductive? (2023)
A.
I(t) = I0 sin(ωt)
B.
I(t) = I0 sin(ωt - π/2)
C.
I(t) = I0 cos(ωt)
D.
I(t) = I0 cos(ωt + π/2)
Show solution
Solution
In a purely inductive circuit, the current lags the voltage by 90 degrees (π/2 radians). Therefore, I(t) = I0 sin(ωt - π/2).
Correct Answer:
B
— I(t) = I0 sin(ωt - π/2)
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Q. In an AC circuit, if the voltage is given by V(t) = V_0 sin(ωt), what is the expression for the current if the circuit is purely inductive? (2023)
A.
I(t) = I_0 sin(ωt)
B.
I(t) = I_0 sin(ωt - π/2)
C.
I(t) = I_0 cos(ωt)
D.
I(t) = I_0 cos(ωt + π/2)
Show solution
Solution
In a purely inductive circuit, the current lags the voltage by 90 degrees (or π/2 radians). Therefore, I(t) = I_0 sin(ωt - π/2).
Correct Answer:
B
— I(t) = I_0 sin(ωt - π/2)
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Q. In an AC circuit, if the voltage is given by V(t) = V₀ sin(ωt), what is the expression for the current through a capacitor? (2022)
A.
I(t) = C dV/dt
B.
I(t) = V₀ sin(ωt)
C.
I(t) = V₀ cos(ωt)
D.
I(t) = V₀ sin(ωt)/R
Show solution
Solution
The current through a capacitor is given by I(t) = C dV/dt. For V(t) = V₀ sin(ωt), the current can be derived from this expression.
Correct Answer:
A
— I(t) = C dV/dt
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Q. In an AC circuit, the average power consumed is given by which formula? (2022)
A.
P = VI
B.
P = VI cos(φ)
C.
P = V²/R
D.
P = I²R
Show solution
Solution
The average power (P) consumed in an AC circuit is given by P = VI cos(φ), where φ is the phase angle between voltage and current.
Correct Answer:
B
— P = VI cos(φ)
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Q. In an AC circuit, the current lags behind the voltage by 90 degrees in which component? (2020)
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Transformer
Show solution
Solution
In an inductor, the current lags behind the voltage by 90 degrees.
Correct Answer:
C
— Inductor
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Q. In an AC circuit, the current lags behind the voltage by 90 degrees in which type of circuit? (2020)
A.
Resistive
B.
Inductive
C.
Capacitive
D.
RLC
Show solution
Solution
In an inductive circuit, the current lags behind the voltage by 90 degrees.
Correct Answer:
B
— Inductive
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Q. In an AC circuit, the current lags the voltage by 90 degrees in which of the following components? (2020)
A.
Resistor
B.
Capacitor
C.
Inductor
D.
Transformer
Show solution
Solution
In an inductor, the current lags the voltage by 90 degrees.
Correct Answer:
C
— Inductor
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Q. In an AC circuit, the current lags the voltage by 90 degrees in which type of circuit? (2020)
A.
Resistive
B.
Capacitive
C.
Inductive
D.
RLC
Show solution
Solution
In an inductive circuit, the current lags the voltage by 90 degrees.
Correct Answer:
C
— Inductive
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Q. In an AC circuit, what is the phase difference between voltage and current in a purely inductive circuit? (2021)
A.
0 degrees
B.
90 degrees
C.
180 degrees
D.
270 degrees
Show solution
Solution
In a purely inductive AC circuit, the current lags the voltage by 90 degrees.
Correct Answer:
B
— 90 degrees
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Q. In an AC circuit, what is the relationship between the average power and the RMS voltage? (2023)
A.
P = V_rms²/R
B.
P = V_peak²/R
C.
P = V_rms/R
D.
P = V_peak/R
Show solution
Solution
The average power (P) in an AC circuit is given by P = V_rms²/R, where R is the resistance.
Correct Answer:
A
— P = V_rms²/R
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Q. In an AC circuit, what is the unit of reactance? (2019)
A.
Ohm
B.
Farad
C.
Henry
D.
Volt
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Solution
Reactance is measured in Ohms, just like resistance.
Correct Answer:
A
— Ohm
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Q. In an RLC circuit, what does the term 'resonance' refer to? (2019)
A.
Maximum current at a specific frequency
B.
Minimum current at any frequency
C.
Constant voltage
D.
Zero inductance
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Solution
Resonance in an RLC circuit occurs when the inductive reactance equals the capacitive reactance, resulting in maximum current at a specific frequency.
Correct Answer:
A
— Maximum current at a specific frequency
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Q. In an RLC circuit, what happens to the impedance at resonance? (2023)
A.
Minimum
B.
Maximum
C.
Zero
D.
Infinite
Show solution
Solution
At resonance, the impedance in an RLC circuit is at a minimum.
Correct Answer:
A
— Minimum
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Q. In an RLC circuit, what happens to the impedance when the circuit is at resonance? (2023)
A.
Minimum
B.
Maximum
C.
Zero
D.
Infinite
Show solution
Solution
At resonance, the impedance of an RLC circuit is at its minimum.
Correct Answer:
A
— Minimum
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Q. In an RLC series circuit, what happens to the impedance at resonance? (2020)
A.
It is minimum
B.
It is maximum
C.
It is zero
D.
It is equal to resistance
Show solution
Solution
At resonance in an RLC series circuit, the impedance is equal to the resistance.
Correct Answer:
D
— It is equal to resistance
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Q. In fluid mechanics, what does the term 'streamline' refer to? (2020)
A.
Path of a fluid particle
B.
Layer of fluid
C.
Viscous flow
D.
Turbulent flow
Show solution
Solution
A streamline refers to the path followed by a fluid particle in a steady flow.
Correct Answer:
A
— Path of a fluid particle
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Q. In measurements, what does precision refer to? (2022)
A.
Closeness to the true value
B.
Consistency of repeated measurements
C.
Range of values
D.
Average of measurements
Show solution
Solution
Precision refers to the consistency of repeated measurements, regardless of their accuracy.
Correct Answer:
B
— Consistency of repeated measurements
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Q. In measurements, what does the term 'precision' refer to? (2022)
A.
Closeness to the true value
B.
Consistency of repeated measurements
C.
Range of values
D.
Average of measurements
Show solution
Solution
Precision refers to the consistency of repeated measurements, regardless of their accuracy.
Correct Answer:
B
— Consistency of repeated measurements
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Q. In nuclear fission, the mass of the products is less than the mass of the reactants. What is this mass difference converted into? (2019)
A.
Kinetic energy
B.
Potential energy
C.
Binding energy
D.
Radiation
Show solution
Solution
The mass difference in nuclear fission is converted into kinetic energy of the fission fragments, according to Einstein's equation E=mc².
Correct Answer:
A
— Kinetic energy
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Q. In nuclear fission, the mass of the products is less than the mass of the reactants. What is this mass difference called? (2019)
A.
Nuclear mass
B.
Binding energy
C.
Mass defect
D.
Fission energy
Show solution
Solution
The mass difference in nuclear fission is referred to as the mass defect, which is converted into energy according to Einstein's equation E=mc².
Correct Answer:
C
— Mass defect
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Q. In nuclear fission, what is released as a result of the reaction? (2022)
A.
Energy and neutrons
B.
Only energy
C.
Only neutrons
D.
Protons and electrons
Show solution
Solution
Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.
Correct Answer:
A
— Energy and neutrons
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Q. In nuclear fission, what is released? (2022)
A.
Energy and neutrons
B.
Only energy
C.
Only neutrons
D.
Protons and electrons
Show solution
Solution
Nuclear fission releases a significant amount of energy and additional neutrons, which can induce further fission reactions.
Correct Answer:
A
— Energy and neutrons
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Q. In nuclear reactions, what is conserved? (2022)
A.
Mass only
B.
Charge only
C.
Mass and charge
D.
Energy only
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Solution
In nuclear reactions, both mass and charge are conserved, which is a fundamental principle of physics.
Correct Answer:
C
— Mass and charge
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Q. In the context of atomic structure, what does the term 'isotope' refer to? (2021)
A.
Atoms with the same number of protons but different neutrons
B.
Atoms with different numbers of protons
C.
Atoms with the same mass number
D.
Atoms that are chemically identical
Show solution
Solution
Isotopes are defined as atoms that have the same number of protons but different numbers of neutrons.
Correct Answer:
A
— Atoms with the same number of protons but different neutrons
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Q. In the context of atomic structure, what does the term 'quantum leap' refer to? (2022)
A.
Movement of electrons in a circular path
B.
Transition of an electron between energy levels
C.
Emission of light
D.
Absorption of energy
Show solution
Solution
A 'quantum leap' refers to the transition of an electron between discrete energy levels in an atom.
Correct Answer:
B
— Transition of an electron between energy levels
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Q. In the context of measurements, what does precision refer to? (2022)
A.
Closeness to the true value
B.
Consistency of repeated measurements
C.
Range of values
D.
Average of measurements
Show solution
Solution
Precision refers to the consistency of repeated measurements, regardless of their accuracy.
Correct Answer:
B
— Consistency of repeated measurements
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Q. In the hydrogen atom, which transition would emit the photon with the highest energy? (2019)
A.
n=2 to n=1
B.
n=3 to n=2
C.
n=4 to n=3
D.
n=5 to n=4
Show solution
Solution
The energy of the emitted photon is highest for the transition from n=2 to n=1, as it involves the largest energy difference.
Correct Answer:
A
— n=2 to n=1
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Showing 361 to 390 of 956 (32 Pages)
Physics (NEET) MCQ & Objective Questions
Physics is a crucial subject for students preparing for NEET and other competitive exams. Mastering Physics (NEET) through MCQs and objective questions not only enhances conceptual clarity but also boosts your confidence for the exam. Regular practice of important questions helps in identifying weak areas and improves overall performance in exams.
What You Will Practise Here
Mechanics: Laws of Motion and their applications
Thermodynamics: Key principles and formulas
Electromagnetism: Concepts of electric fields and circuits
Optics: Reflection, refraction, and lens formulas
Waves: Sound waves and their properties
Modern Physics: Basics of quantum mechanics and atomic structure
Units and Measurements: Significant figures and dimensional analysis
Exam Relevance
Physics is a significant part of the syllabus for CBSE, State Boards, NEET, and JEE. In these exams, you can expect a variety of question patterns, including conceptual MCQs, numerical problems, and application-based questions. Understanding the core concepts and practicing Physics (NEET) MCQ questions will help you tackle these questions effectively and efficiently.
Common Mistakes Students Make
Misinterpreting the question stem, leading to incorrect answers.
Neglecting units and dimensions in numerical problems.
Overlooking the significance of diagrams in understanding concepts.
Confusing similar concepts, such as velocity and acceleration.
FAQs
Question: How can I improve my Physics (NEET) scores?Answer: Regular practice of MCQs and understanding the underlying concepts will significantly enhance your scores.
Question: Are there specific topics I should focus on for NEET Physics?Answer: Focus on Mechanics, Thermodynamics, and Electromagnetism, as these areas frequently appear in exams.
Start solving practice MCQs today to test your understanding and solidify your knowledge in Physics. Remember, consistent practice is the key to success in your exam preparation!
