12th Standard Physics QUIZ – Quarterly MCQs 5 Theory / Conceptual Tests

12th Standard Physics – Quarterly MCQs

5 Theory / Conceptual Tests

Each Test: 15 Questions • Select the answer and submit

Instructions: These tests contain only theory/conceptual questions selected from the two supplied Physics Quarterly MCQS Test 1 and Test 2 PDFs. Numerical-calculation and graph-reading questions have been excluded. After submission, the correct answer is displayed inside each question.

Physics Quarterly MCQs – Theory Test 1

15 Theory / Conceptual Questions

Q1. Electromagnetic waves are ______ waves.

A. Longitudinal B. Transverse C. Mechanical D. Sound

Correct Answer: B. Transverse

Source: T2 • Q46

Q2. Nichrome wire is used as the heating element because it has

A. Low specific resistance B. Low melting point C. High specific resistance D. High thermal conductivity

Correct Answer: C. High specific resistance

Source: T2 • Q15

Q3. Which charge configuration produces a uniform electric field?

A. Point charge B. Uniformly charged infinite line C. Uniformly charged infinite plane D. Uniformly charged spherical shell

Correct Answer: C. Uniformly charged infinite plane

Source: T1 • Q1

Q4. When an electric current is passed in a circuit consisting of two different metals, heat is evolved at one junction and absorbed at the other end. This is known as

A. Seebeck effect B. Peltier effect C. Joule's law D. Thomson effect

Correct Answer: B. Peltier effect

Source: T2 • Q25

Q5. The phenomenon of superconductivity was first observed by

A. George Simon Ohm B. Volta C. Faraday Onnes D. Kammerlingh Onnes

Correct Answer: D. Kammerlingh Onnes

Source: T1 • Q18

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Q6. Stars twinkle due to

A. Reflection B. Total internal reflection C. Refraction D. Polarisation

Correct Answer: C. Refraction

Source: T2 • Q53

Q7. The necessary magnetic field for a low-power a.c. generator is produced by

A. Electric coil B. Permanent magnets C. Electromagnets D. Batteries

Correct Answer: C. Electromagnets

Source: T1 • Q38

Q8. In an a.c. generator, the brushes are made of

A. Silicon B. Plastic C. Carbon D. Nylon

Correct Answer: C. Carbon

Source: T2 • Q38

Q9. Three wires of equal lengths are bent in the form of loops. One is a circle, another a semicircle and the third a square. They are placed in a uniform magnetic field and the same electric current is passed through them. Which loop configuration will experience greater torque?

A. Circle B. Semicircle C. Square D. All of them

Correct Answer: A. Circle

Source: T2 • Q20

Q10. A thin conducting spherical shell of radius R has a charge Q uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is

A. Potential is zero inside and falls as 1/r outside B. Potential is constant inside and falls as 1/r outside C. Potential increases linearly up to R and then falls linearly D. Potential increases linearly up to R and then falls as 1/r

Correct Answer: B. Potential is constant inside and falls as 1/r outside

Source: T2 • Q4

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Q11. A phenomenon in which a varying current in one coil induces an emf in the neighbouring coil is

A. Mutual induction B. Self induction C. Electrostatic induction D. Electromagnetic induction

Correct Answer: A. Mutual induction

Source: T2 • Q37

Q12. Electric filament lamp gives rise to ______ spectrum.

A. Line B. Band C. Continuous D. Absorption

Correct Answer: C. Continuous

Source: T1 • Q47

Q13. These are behaving like thermistors

A. Insulators and conductors B. Semiconductors and conductors C. Insulators and semiconductors D. Conductors and alloys

Correct Answer: C. Insulators and semiconductors

Source: T1 • Q28

Q14. The physical properties of electromagnetic waves are not determined by

A. Material B. Wavelength C. Frequency D. Method of excitation

Correct Answer: A. Material

Source: T1 • Q49

Q15. The unit of permittivity is

A. C² N⁻¹ m⁻² B. N m² C⁻² C. H m⁻¹ D. N C⁻² m⁻²

Correct Answer: A. C² N⁻¹ m⁻²

Source: T2 • Q50

Physics Quarterly MCQs – Theory Test 2

15 Theory / Conceptual Questions

Q1. The phenomenon of superconductivity was first observed by

A. George Simon Ohm B. Volta C. Faraday Onnes D. Kammerlingh Onnes

Correct Answer: D. Kammerlingh Onnes

Source: T1 • Q18

Q2. The resistance of an ideal ammeter is

A. Large B. Infinite C. Zero D. Small

Correct Answer: C. Zero

Source: T2 • Q24

Q3. Which energy is used to liberate the outer electron from the individual atoms?

A. Thermostatic external energy B. Thermodynamic internal energy C. Thermodynamic external energy D. Thermostatic internal energy

Correct Answer: B. Thermodynamic internal energy

Source: T2 • Q16

Q4. In Ampere's circuital law, the value of the line integral ∮ B · dl

A. Depends on the shape of the current path B. Depends on the position of the wire within the magnetic field C. Depends only on the direction of the current D. Is zero when the closed path does not encircle the wire

Correct Answer: D. Is zero when the closed path does not encircle the wire

Source: T1 • Q26

Q5. If Vg, Vx and Vm are the speeds of gamma rays, X-rays and microwaves respectively in vacuum, then

A. Vg < Vx < Vm B. Vg > Vx > Vm C. Vg > Vx < Vm D. Vg = Vx = Vm

Correct Answer: D. Vg = Vx = Vm

Source: T2 • Q45

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Q6. Which of the following is false for electromagnetic waves?

A. Transverse B. Non-mechanical waves C. Longitudinal D. Produced by accelerating charges

Correct Answer: C. Longitudinal

Source: T2 • Q42

Q7. An electromagnetic wave is propagating with velocity v along +x-axis. If the instantaneous oscillating electric field is along +y-axis, the direction of the oscillating magnetic field is along

A. −y direction B. −x direction C. +z direction D. −z direction

Correct Answer: C. +z direction

Source: T2 • Q51

Q8. In an a.c. generator, the brushes are made of

A. Silicon B. Plastic C. Carbon D. Nylon

Correct Answer: C. Carbon

Source: T2 • Q38

Q9. A phenomenon in which a varying current in one coil induces an emf in the neighbouring coil is

A. Mutual induction B. Self induction C. Electrostatic induction D. Electromagnetic induction

Correct Answer: A. Mutual induction

Source: T2 • Q37

Q10. Which of the following is an electromagnetic wave?

A. α-rays B. β-rays C. γ-rays D. All of them

Correct Answer: C. γ-rays

Source: T2 • Q43

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Q11. A thin conducting spherical shell of radius R has a charge Q uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is

A. Potential is zero inside and falls as 1/r outside B. Potential is constant inside and falls as 1/r outside C. Potential increases linearly up to R and then falls linearly D. Potential increases linearly up to R and then falls as 1/r

Correct Answer: B. Potential is constant inside and falls as 1/r outside

Source: T2 • Q4

Q12. The magnetic polarity of a current-carrying solenoid is given by

A. Ampere's circuital law B. Fleming's right-hand rule C. Fleming's left-hand rule D. End rule

Correct Answer: D. End rule

Source: T2 • Q28

Q13. The unit of electric field intensity is

A. N C⁻¹ B. N C⁻¹ C² m⁻¹ C. C m D. V m

Correct Answer: A. N C⁻¹

Source: T1 • Q9

Q14. Three wires of equal lengths are bent in the form of loops. One is a circle, another a semicircle and the third a square. They are placed in a uniform magnetic field and the same electric current is passed through them. Which loop configuration will experience greater torque?

A. Circle B. Semicircle C. Square D. All of them

Correct Answer: A. Circle

Source: T2 • Q20

Q15. Which of the following cannot be stepped up in a transformer?

A. Input current B. Input voltage C. Input power D. All

Correct Answer: C. Input power

Source: T1 • Q37

Physics Quarterly MCQs – Theory Test 3

15 Theory / Conceptual Questions

Q1. Three wires of equal lengths are bent in the form of loops. One is a circle, another a semicircle and the third a square. They are placed in a uniform magnetic field and the same electric current is passed through them. Which loop configuration will experience greater torque?

A. Circle B. Semicircle C. Square D. All of them

Correct Answer: A. Circle

Source: T2 • Q20

Q2. These are behaving like thermistors

A. Insulators and conductors B. Semiconductors and conductors C. Insulators and semiconductors D. Conductors and alloys

Correct Answer: C. Insulators and semiconductors

Source: T1 • Q28

Q3. If Vg, Vx and Vm are the speeds of gamma rays, X-rays and microwaves respectively in vacuum, then

A. Vg < Vx < Vm B. Vg > Vx > Vm C. Vg > Vx < Vm D. Vg = Vx = Vm

Correct Answer: D. Vg = Vx = Vm

Source: T2 • Q45

Q4. Which energy is used to liberate the outer electron from the individual atoms?

A. Thermostatic external energy B. Thermodynamic internal energy C. Thermodynamic external energy D. Thermostatic internal energy

Correct Answer: B. Thermodynamic internal energy

Source: T2 • Q16

Q5. The direction of electric field at a point on the equatorial line due to an electric dipole is

A. Along the equatorial line towards the dipole B. Along the equatorial line away from the dipole C. Parallel to the axis of the dipole and opposite to the direction of dipole moment D. Parallel to the axis of the dipole and in the direction of dipole moment

Correct Answer: C. Parallel to the axis of the dipole and opposite to the direction of dipole moment

Source: T1 • Q6

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Q6. The physical properties of electromagnetic waves are not determined by

A. Material B. Wavelength C. Frequency D. Method of excitation

Correct Answer: A. Material

Source: T1 • Q49

Q7. An electromagnetic wave is propagating with velocity v along +x-axis. If the instantaneous oscillating electric field is along +y-axis, the direction of the oscillating magnetic field is along

A. −y direction B. −x direction C. +z direction D. −z direction

Correct Answer: C. +z direction

Source: T2 • Q51

Q8. The unit of electric field intensity is

A. N C⁻¹ B. N C⁻¹ C² m⁻¹ C. C m D. V m

Correct Answer: A. N C⁻¹

Source: T1 • Q9

Q9. Which of the following is an electromagnetic wave?

A. α-rays B. β-rays C. γ-rays D. All of them

Correct Answer: C. γ-rays

Source: T2 • Q43

Q10. The EM waves do not transport

A. Energy B. Charge C. Momentum D. Information

Correct Answer: B. Charge

Source: T1 • Q46

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Q11. Which of the following is NOT true for electromagnetic waves?

A. They transport energy B. They transport momentum C. They transport angular momentum D. In vacuum, they travel with different speeds which depend on their frequency

Correct Answer: D. In vacuum, they travel with different speeds which depend on their frequency

Source: T2 • Q44

Q12. The necessary magnetic field for a low-power a.c. generator is produced by

A. Electric coil B. Permanent magnets C. Electromagnets D. Batteries

Correct Answer: C. Electromagnets

Source: T1 • Q38

Q13. If the velocity and wavelength of light in air are Va and λa and those in water are Vw and λw, then the refractive index of water is

A. Vw/Va B. Va/Vw C. λw/λa D. Vaλa/(Vwλw)

Correct Answer: B. Va/Vw

Source: T2 • Q52

Q14. When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index

A. Less than one B. Less than that of glass C. Greater than that of glass D. Equal to that of glass

Correct Answer: D. Equal to that of glass

Source: T2 • Q54

Q15. Gauss law is another form of

A. Newton's law B. Kepler's law C. Ohm's law D. Coulomb's law

Correct Answer: D. Coulomb's law

Source: T2 • Q9

Physics Quarterly MCQs – Theory Test 4

15 Theory / Conceptual Questions

Q1. The leakage of electric charge from the sharp points on a charged conductor is known as

A. Electrostatic inductor B. Conduction of charges C. Discharging of energy D. Corona discharge

Correct Answer: D. Corona discharge

Source: T1 • Q10

Q2. Which of the following is an electromagnetic wave?

A. α-rays B. β-rays C. γ-rays D. All of them

Correct Answer: C. γ-rays

Source: T2 • Q43

Q3. Fleming's left-hand and right-hand rules are used respectively in

A. D.C. motor and D.C. generator B. D.C. motor and A.C. generator C. D.C. motor and A.C. motor D. A.C. generator and A.C. motor

Correct Answer: B. D.C. motor and A.C. generator

Source: T1 • Q40

Q4. Stars twinkle due to

A. Reflection B. Total internal reflection C. Refraction D. Polarisation

Correct Answer: C. Refraction

Source: T2 • Q53

Q5. The unit of magnetic flux density is

A. Wb m⁻² B. Tesla C. Weber D. Both Wb m⁻² and tesla

Correct Answer: D. Both Wb m⁻² and tesla

Source: T2 • Q30

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Q6. The necessary magnetic field for a low-power a.c. generator is produced by

A. Electric coil B. Permanent magnets C. Electromagnets D. Batteries

Correct Answer: C. Electromagnets

Source: T1 • Q38

Q7. The emf of self-inductance is expressed in units equivalent to

A. Volt B. Ohm C. Ampere D. Coulomb

Correct Answer: A. Volt

Source: T1 • Q41

Q8. Which of the following is false for electromagnetic waves?

A. Transverse B. Non-mechanical waves C. Longitudinal D. Produced by accelerating charges

Correct Answer: C. Longitudinal

Source: T2 • Q42

Q9. When a biconvex lens of glass having refractive index 1.47 is dipped in a liquid, it acts as a plane sheet of glass. This implies that the liquid must have refractive index

A. Less than one B. Less than that of glass C. Greater than that of glass D. Equal to that of glass

Correct Answer: D. Equal to that of glass

Source: T2 • Q54

Q10. ________ spectra are used for making dyes.

A. Continuous emission B. Band emission C. Band absorption D. Line spectra

Correct Answer: B. Band emission

Source: T2 • Q47

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Q11. In a tangent galvanometer, the magnetic needle is small so that

A. The circular scale is small B. The compass box is small C. It can be easily deflected D. It remains in uniform magnetic field

Correct Answer: C. It can be easily deflected

Source: T1 • Q25

Q12. Nichrome wire is used as the heating element because it has

A. Low specific resistance B. Low melting point C. High specific resistance D. High thermal conductivity

Correct Answer: C. High specific resistance

Source: T2 • Q15

Q13. Electric filament lamp gives rise to ______ spectrum.

A. Line B. Band C. Continuous D. Absorption

Correct Answer: C. Continuous

Source: T1 • Q47

Q14. The electric and magnetic fields of an electromagnetic wave are

A. In phase and perpendicular to each other B. Out of phase and not perpendicular to each other C. In phase and not perpendicular to each other D. Out of phase and perpendicular to each other

Correct Answer: A. In phase and perpendicular to each other

Source: T1 • Q45

Q15. Which of the following cannot be stepped up in a transformer?

A. Input current B. Input voltage C. Input power D. All

Correct Answer: C. Input power

Source: T1 • Q37

Physics Quarterly MCQs – Theory Test 5

15 Theory / Conceptual Questions

Q1. The unit of magnetic flux density is

A. Wb m⁻² B. Tesla C. Weber D. Both Wb m⁻² and tesla

Correct Answer: D. Both Wb m⁻² and tesla

Source: T2 • Q30

Q2. In an LCR circuit at resonance, the current

A. Is zero B. Is in phase with the voltage C. Leads the voltage D. Lags behind the voltage

Correct Answer: B. Is in phase with the voltage

Source: T2 • Q40

Q3. ________ spectra are used for making dyes.

A. Continuous emission B. Band emission C. Band absorption D. Line spectra

Correct Answer: B. Band emission

Source: T2 • Q47

Q4. Stars twinkle due to

A. Reflection B. Total internal reflection C. Refraction D. Polarisation

Correct Answer: C. Refraction

Source: T2 • Q53

Q5. If Vg, Vx and Vm are the speeds of gamma rays, X-rays and microwaves respectively in vacuum, then

A. Vg < Vx < Vm B. Vg > Vx > Vm C. Vg > Vx < Vm D. Vg = Vx = Vm

Correct Answer: D. Vg = Vx = Vm

Source: T2 • Q45

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Q6. A bird sitting on a high-power line

A. Gets killed instantly B. Gets a mild shock C. Is not affected practically D. Gets a fatal shock

Correct Answer: C. Is not affected practically

Source: T2 • Q5

Q7. Nichrome wire is used as the heating element because it has

A. Low specific resistance B. Low melting point C. High specific resistance D. High thermal conductivity

Correct Answer: C. High specific resistance

Source: T2 • Q15

Q8. The EM waves do not transport

A. Energy B. Charge C. Momentum D. Information

Correct Answer: B. Charge

Source: T1 • Q46

Q9. A phenomenon in which a varying current in one coil induces an emf in the neighbouring coil is

A. Mutual induction B. Self induction C. Electrostatic induction D. Electromagnetic induction

Correct Answer: A. Mutual induction

Source: T2 • Q37

Q10. A thin conducting spherical shell of radius R has a charge Q uniformly distributed on its surface. The correct plot for electrostatic potential due to this spherical shell is

A. Potential is zero inside and falls as 1/r outside B. Potential is constant inside and falls as 1/r outside C. Potential increases linearly up to R and then falls linearly D. Potential increases linearly up to R and then falls as 1/r

Correct Answer: B. Potential is constant inside and falls as 1/r outside

Source: T2 • Q4

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Q11. Which of the following is false for electromagnetic waves?

A. Transverse B. Non-mechanical waves C. Longitudinal D. Produced by accelerating charges

Correct Answer: C. Longitudinal

Source: T2 • Q42

Q12. The leakage of electric charge from the sharp points on a charged conductor is known as

A. Electrostatic inductor B. Conduction of charges C. Discharging of energy D. Corona discharge

Correct Answer: D. Corona discharge

Source: T1 • Q10

Q13. Three wires of equal lengths are bent in the form of loops. One is a circle, another a semicircle and the third a square. They are placed in a uniform magnetic field and the same electric current is passed through them. Which loop configuration will experience greater torque?

A. Circle B. Semicircle C. Square D. All of them

Correct Answer: A. Circle

Source: T2 • Q20

Q14. The phenomenon of superconductivity was first observed by

A. George Simon Ohm B. Volta C. Faraday Onnes D. Kammerlingh Onnes

Correct Answer: D. Kammerlingh Onnes

Source: T1 • Q18

Q15. Electromagnetic waves are ______ waves.

A. Longitudinal B. Transverse C. Mechanical D. Sound

Correct Answer: B. Transverse

Source: T2 • Q46

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