MCQ Questions for Class 10 Maths with Answers PDF Download

MCQ Questions for Class 10 Maths with Answers

MCQ Questions for Class 10 Maths with Answers PDF Free Download is very important for students who want to score good marks in their CBSE board examination. Students who can Practice Maths MCQ For Class 10 CBSE With Answers Pdf to improve your score in Board Exams.

MCQ Questions for Class 10 Maths with Answers PDF Download

Practicing NCERT Maths Multiple Choice Questions With Answers For Class 10 Pdf is one of the best ways to prepare for the CBSE Class 10 board exam. There is no substitute for consistent practice whether one wants to understand a concept thoroughly or you wants to score better. By practicing more Maths Quiz Questions with Answers for Class 10 Pdf, students can improve their speed and accuracy which can help them during their board exam.

  1. Real Numbers MCQ Questions
  2. Polynomials MCQ Questions
  3. Pair of Linear Equations in Two Variables MCQ Questions
  4. Quadratic Equations MCQ Questions
  5. Arithmetic Progressions MCQ Questions
  6. Triangles MCQ Questions
  7. Coordinate Geometry MCQ Questions
  8. Introduction to Trigonometry MCQ Questions
  9. Some Applications of Trigonometry MCQ Questions
  10. Circles MCQ Questions
  11. Constructions MCQ Questions
  12. Areas Related to Circles MCQ Questions
  13. Surface Areas and Volumes MCQ Questions
  14. Statistics MCQ Questions
  15. Probability MCQ Questions

We hope the given MCQ Questions for Class 10 Maths with Answers PDF Free Download will help you. If you have any query regarding CBSE Maths Multiple Choice Questions With Answers For Class 10, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 14 Semiconductor Electronics: Materials, Devices and Simple Circuits. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits MCQs Pdf with Answers to know their preparation level.

Semiconductor Electronics: Materials, Devices and Simple Circuits Class 12 Physics MCQs Pdf

1. At absolute zero, Si acts as a
(a) metal
(b) semiconductor
(c) insulator
(d) none of these

Answer

Answer: c


2. In good conducrors of electricity the type of bonding that exist is
(a) Van der Walls
(b) covalent
(c) ionic
(d) metallic

Answer

Answer: d


3. The manifestation of band structure in solids is due to
(a) Heisenberg uncertainty priniciple
(b) Pauli’s exclusion principle
(c) Bohr’s correspondence principle
(d) Boltzmann law

Answer

Answer: b


4. The probability of electrons to be found in the conduction band of an intrinsic semiconductor of finite temperature
(a) increases exponentially with increasing band gaP
(b) decreases exponentially with increasing band gap
(c) decreases with increasing temperature.
(d) is independent of the temperature and band gap

Answer

Answer: b


5. In an n-type silicon, which of the following statements is true.
(a) Electrons are majority carriers and trivalent atoms are the dopants’
(b) Electrons are minority carriers and pentava- lent atoms are the dopants.
(c) Holes are minority carriers and pentavalent atoms are the dopants.
(d) Holes are majority carriers and trivalent atoms are the dopants.

Answer

Answer: c


6. If a small amount of antimony is added to germanium crystal
(a) its resistance is increased
(b) it becomes a p-type semiconductor
(c) there will be more free electrons than holes in the semiconductor,
(d) none of these.

Answer

Answer: c


7. The dominant mechanism for motion of charge carriers in forward and reverse biased silicon p-n junction are
(a) drift in forward bias, diffusion in reverse bias
(b) diffusion in forward bias, drift in reverse bias
(c) diffusion in both forward and reverse bias
(d) drift in both forward and reverse bias

Answer

Answer: b


8. In an unbiased p-n junction, holes diffuse from the p-region to n-region because
(a) free electrons in the n-region attract them
(b) they move across the junction by the potential difference
(c) hole concentration in p-region is more as compared to u-region.
(d) all of these

Answer

Answer: c


9. Region without free electrons and holes in a p-n junction is
(a) n-region
(b) p-region
(c) depletion region
(d) none of these

Answer

Answer: c


10. Which of the following statements is incorrect for the depletion region of a diode?
(a) There the mobile charges exist.
(b) Equal number of holes and electrons exist, making the region neutral.
(c) Recombination of holes and electrons has taken place.
(d) None of these

Answer

Answer: a


11. Potential barrier developed in a junction diode opposes the flow of
(a) minority carrier in both regions only
(b) majority carriers only
(c) electrons in p region
(d) holes in p region

Answer

Answer: b


12. The breakdown in a reverse biased p-n junction diode is more likely to occur due to
(a) large velocity of the minority charge carriers if the doping concentration is small
(b) large velocity of the minority charge carriers if the doping concentration is large
(c) strong electric field in a depletion region if the doping concentration is small
(d) none of these

Answer

Answer: b


13. What happens during regulation action of a Zener diode?
(a) The current through the series resistance (Rs) changes.
(b) The resistance offered by the Zener changes.
(c) The Zener resistance is constant.
(d) Both (a) and (b)

Answer

Answer: d


14. A zener diode is specified as having a breakdown voltage of 9.1 V, with a maximum power dissipation of 364 mW. What is the maximum current the diode can handle?
(a) 40 mA
(b) 60 mA
(c) 50 mA
(d) 45 mA

Answer

Answer: a


15. In a half wave rectifier circuit operating from 50 Hz mains frequency, the fundamental frequency in the ripple would be
(a) 25 Hz
(b) 50 Hz
(c) 70.7 Hz
(d) 100 Hz

Answer

Answer: b


16. In the circuit shown if current for the diode is 20 μA, the potential difference across the diode is
Physics MCQs for Class 12 with Answers Chapter 14 Semiconductor Electronics Materials, Devices and Simple Circuits 1
(a) 2 V
(b) 4.5 V
(c) 4 V
(d) 2.5 V

Answer

Answer: c


17. Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (E^)c, (Eg)Si and (Eg)Ge. Which of the following statements is true?
(a) (Eg)Si < (Eg)Ge < (Eg)C
(b) (Eg)C< (Eg)Ge < (Eg)Si
(c) (Eg)C < (Eg)Si < (Eg)Ge
(d) (Eg)C = (Eg)Si < (Eg)Ge

Answer

Answer: c


18. If the energy of a photon of sodium light (A = 589 nm) equals the band gap of semiconductor, the minimum energy required to create hole electron pair
(a) 1.1 eV
(b) 2.1 eV
(c) 3.2 eV
(d) 1.5 eV

Answer

Answer: b


19. If in a n-type semiconductor when all donor states are filled, then the net charge density in the donor states becomes
(a) 1
(b) > 1
(c) < 1, but not zero
(d) zero

Answer

Answer: b


20. The circuit has two oppositely connected ideal diodes in parallel. What is the current flowing in the circuit?
Physics MCQs for Class 12 with Answers Chapter 14 Semiconductor Electronics Materials, Devices and Simple Circuits 2
(a) 2.0 A
(b) 1.33 A
(c) 1.73 A
(d) 2.31 A

Answer

Answer: c


We hope the given Physics MCQs for Class 12 with Answers Chapter 13 Semiconductor Electronics: Materials, Devices and Simple Circuits will help you. If you have any query regarding CBSE Class 12 Physics Semiconductor Electronics: Materials, Devices and Simple Circuits MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 13 Nuclei

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 13 Nuclei. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Nuclei MCQs Pdf with Answers to know their preparation level.

Nuclei Class 12 Physics MCQs Pdf

1. The set which represent the isotope, isobar, and isotone respectively is
Physics MCQs for Class 12 with Answers Chapter 13 Nuclei

Answer

Answer: d


2. The mass number of iron nucleus is 56 the nuclear density is
(a) 2.29 × 1016 kg m-3
(b) 2.29 × 1017 kg m-3
(c) 2.29 × 1018 kg m-3
(d) 2.29 × 1015 kg m-3

Answer

Answer: b


3. Order of magnitude of density of uranium nucleus is
(a) 1020 kg m-3
(b) 1017 kg m-3
(c) 1014 kg m-3
(d) 1011 kg m-3

Answer

Answer: b


4. The radius of a spherical nucleus as measured by electron scattering is 3.6 fm. What is the mass number of the nucleus most likely to be?
(a) 27
(b) 40
(c) 56
(d) 120

Answer

Answer: a


5. The half life of a radioactive susbtance is 30 days. What is the time taken to disintegrate to 3/4th of its original mass?
(a) 30 days
(b) 15 days
(c) 60 days
(d) 90 days

Answer

Answer: c


6. The number of beta particles emitted by a radioactive substance is twice the number of alpha particles emitted by it. The resulting daughter is an
(a) isomer of parent
(b) isotone of parent
(c) isotope of parent
(d) isobar of parent

Answer

Answer: c


7. During negative β-decay, an antineutrino is also emitted along with the emitted electron. Then,
(a) only linear momentum will be conserved
(b) total linear momentum and total angular momentum but not total energy will be conserved
(c) total linear momentum, and total energy but not total angular momentum will conserved
(d) total linear momentum, total angular momentum and total energy will be conserved

Answer

Answer: d


8. Consider α and β particles and γ-rays each having an energy of 0.5 MeV. In the increasing order of penetrating power, the radiation are respectively
(a) α, β, γ
(b) α, γ, β
(c) β, γ, α
(d) γ β, α

Answer

Answer: a


9. An electron emitted in beta radiation originates from
(a) inner orbits of atom
(b) free electrons existing in the nuclei
(c) decay of a neutron in a nuclei
(d) photon escaping from the nucleus

Answer

Answer: c


10. Complete the series 6He → e + 6Li +
(a) neutrino
(b) antineutrino
(c) proton
(d) neutron

Answer

Answer: b


11. An element A decays into an element C by a two step process A → B+ 2He4 and B → C + 2e. Then,
(a) A and C are isotopes
(b) A and C are isobars
(c) B and C are isotopes
(d) A and B are isobars

Answer

Answer: a


12. The equation 41 1H+ → 24He2+ + 2e + 26 MeV
represents
(a) β-decay
(b) γ-decay
(c) fusion
(d) fission

Answer

Answer: c


13. Light energy emitted by star is due to
(a) breaking of nuclei
(b) joining of nuclei
(c) burning of nuclei
(d) reflection of solar light

Answer

Answer: b


14. In nuclear reaction, there is conservation of
(a) mass only
(b) energy only
(c) momentum only
(d) mass, energy and momentum

Answer

Answer: d


15. In nuclear reactors, the control rods are made of
(a) cadmium
(b) graphite
(c) krypton
(d) plutonium

Answer

Answer: a


We hope the given Physics MCQs for Class 12 with Answers Chapter 13 Nuclei will help you. If you have any query regarding CBSE Class 12 Physics Nuclei MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 12 Atoms

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 12 Atoms. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Atoms MCQs Pdf with Answers to know their preparation level.

Atoms Class 12 Physics MCQs Pdf

1. The first model of atom in 1898 was proposed by
(a) Ernst Rutherford
(b) Albert Einstein
(c) J.J. Thomson
(d) Niels Bohr

Answer

Answer: c


2. In Geiger-Marsden scattering experiment, the trajectory traced by an a-particle depends on
(a) number of collision
(b) number of scattered a-particles
(c) impact parameter
(d) none of these

Answer

Answer: c


3. In the Geiger-Marsden scattering experiment the number of scattered particles detected are maximum and minimum at the scattering angles respectively at
(a) 0° and 180°
(b) 180° and 0°
(c) 90° and 180°
(d) 45° and 90°

Answer

Answer: a


4. In the Geiger-Marsden scattering experiment, is case of head-on collision the impact parameter should be
(a) maximum
(b) minimum
(c) infinite
(d) zero

Answer

Answer: a


5. Rutherford’s experiments suggested that the size of the nucleus is about
(a) 10-14 m to 10-12 m
(b) 10-15 m to 10-13 m
(c) 10-15 m to 10-14 m
(d) 10-15 m to 10-12 m

Answer

Answer: c


6. Which of the following spectral series falls within the visible range of electromagnetic radiation?
(a) Lyman series
(b) Balmer series
(c) Paschen seriee
(d) Pfund series

Answer

Answer: b


7. The first spectral series was discovered by
(a) Balmer
(b) Lyman
(c) Paschen
(d) Pfund

Answer

Answer: a


8. Which of the following postulates of the Bohr model led to the quantization of energy of the hydrogen atom?
(a) The electron goes around the nucleus in circular orbits.
(b) The angular momentum of the electron can only be an integral multiple of h/2π.
(c) The magnitude of the linear momentum of the electron is quantized.
(d) Quantization of energy is itself a postulate of the Bohr model.

Answer

Answer: b


9. The Bohr model of atoms
(a) assumes that the angular momentum of elec-trons is quantized.
(b) uses Einstein’s photoelectric equation.
(c) predicts continuous emission spectra for at-oms.
(d) predicts the same emission spectra for all types of atoms.

Answer

Answer: a


10. If tt is the orbit number of the electron in a hydrogen atom, the correct statement among the following is
(a) electron energy increases as n increases.
(b) hydrogen emits infrared rays for the electron transition from n = to n = 1
(c) electron energy is zero for n = 1 (<0 electron energy varies as n2.

Answer

Answer: a


11. If the radius of inner most electronic orbit of a hydrogen atom is 5.3 * 10~n m, then the radii of n = 2 orbits is
(a) 1.12 Å
(b) 2.12 Å
(c) 3.22 Å
(d) 4.54 Å

Answer

Answer: b


12. The diagram shows the energy levels for an electron in a certain atom. Which transition shown represents the emission of a photon with the most energy?
Physics MCQs for Class 12 with Answers Chapter 12 Atoms 1
(a) I
(b) II
(c) III
(d) IV

Answer

Answer: c


13. In a hydrogen atom, the radius of nth Bohr orbit is rn. The graph between log(rn/r1) and log n will be
Physics MCQs for Class 12 with Answers Chapter 12 Atoms 2

Answer

Answer: a


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Physics MCQs for Class 12 with Answers Chapter 11 Dual Nature of Radiation and Matter

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 11 Dual Nature of Radiation and Matter. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Dual Nature of Radiation and Matter MCQs Pdf with Answers to know their preparation level.

Dual Nature of Radiation and Matter Class 12 Physics MCQs Pdf

1. Who established that electric charge is quantised?
(a) J.J. Thomson
(b) William Crookes
(c) R.A. Millikan
(d) Wilhelm Rontgen

Answer

Answer: c


2. Cathode rays were discovered by
(a) Maxwell Clerk James
(b) Heinrich Hertz
(c) William Crookes
(d) J.J. Thomson

Answer

Answer: c


3. The minimum energy required for the electron emission from the metal surface can be supplied to the free electrons by which of the following physical processes?
(a) Thermionic emission
(b) Field emission
(c) Photoelectric emission
(d) All of these

Answer

Answer: d


4. The phenomenon of photoelectric emission was discovered in 1887 by
(a) Albert Einstein
(b) Heinrich Hertz
(c) Wilhelm Hallwachs
(d) Philipp Lenard

Answer

Answer: b


5. A metal surface ejects electrons when hit by green light but nothing when hit by yellow light. The electrons will be ejected when the surface is hit by
(a) blue light
(b) heat rays
(c) infrared light
(d) red light

Answer

Answer: a


6. Which of the following statements is correct regarding the photoelectric experiment?
(a) The photocurrent increases with intensity of light.
(b) Stopping potential increases with increase in intensity of incident light.
(c) The photocurrent increases with increase in frequency.
(d) All of these

Answer

Answer: a


7. In photoelectric effect, the photocurrent
(a) depends both on intensity and frequency of the incident light.
(b) does not depend on the frequency of incident light but depends on the intensity of the inci-dent light.
(c) decreases with increase in frequency of inci-dent light.
(d) increases with increase in frequency of inci-dent light.

Answer

Answer: b


8. The maximum value of photoelectric current is called
(a) base current
(b) saturation current
(c) collector current
(d) emitter current

Answer

Answer: b


9. In photoelectric effect, the photoelectric current is independent of
(a) intensity of incident light
(b) potential difference applied between the two electrodes
(c) the nature of emitter material
(d) frequency of incident light

Answer

Answer: d


10. In photoelectric effect, stopping potential depends on
(a) frequency of incident light
(b) nature of the emitter material
(c) intensity of incident light
(d) both (a) and (b)

Answer

Answer: d


11. According to Einstein’s photoelectric equation, the graph of kinetic energy of the photoelectron emitted from the metal versus the frequency of the incident radiation gives a straight line graph, whose slope
(a) depends on the intensity of the incident radi-ation.
(b) depends on the nature of the metal and also on the intensity of incident radiation.
(c) is same for all metals and independent of the intensity of the incident radiation.
(d) depends on the nature of the metal.

Answer

Answer: c


12. The figure shows stopping V0A potential V0 and frequency o for two different metallic surfaces A and B. The work function of A, as compared to that of B is
Physics MCQs for Class 12 with Answers Chapter 11 Dual Nature of Radiation and Matter
(a) less
(b) more
(c) equal
(d) nothing can be said

Answer

Answer: a


13. Which phenomenon best supports the theory that matter has a wave nature?
(a) Electron momentum
(b) Electron diffraction
(c) Photon momentum
(d) Photon diffraction

Answer

Answer: b


We hope the given Physics MCQs for Class 12 with Answers Chapter 11 Dual Nature of Radiation and Matter will help you. If you have any query regarding CBSE Class 12 Physics Dual Nature of Radiation and Matter MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 10 Wave Optics

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 10 Wave Optics. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Wave Optics MCQs Pdf with Answers to know their preparation level.

Wave Optics Class 12 Physics MCQs Pdf

1. The idea of secondary wavelets for the. propagation of a wave was first given by
(a) Newton
(b) Huygens
(c) Maxwell
(d) Fresnel

Answer

Answer: b


2. Light propagates rectilinearly, due to
(a) wave nature
(b) wavelengths
(c) velocity
(d) frequency

Answer

Answer: a


3. Which of the following is correct for light diverging from a point source?
(a) The intensity decreases in proportion with the distance squared.
(b) The wavefront is parabolic.
(c) The intensity at the wavelength does not depend on the distance.
(d) None of these.

Answer

Answer: a


4. The refractive index of glass is 1.5 for light waves of X = 6000 A in vacuum. Its wavelength in glass is
(a) 2000 Å
(b) 4000 Å
(c) 1000 Å
(d) 3000 Å

Answer

Answer: b


5. The phenomena which is not explained by Huygen’s construction of wavefront
(a) reflection
(b) diffraction
(c) refraction
(d) origin of spectra

Answer

Answer: d


6. A laser beam is used for locating distant objects because
(a) it is monochromatic
(b) it is not chromatic
(c) it is not observed
(d) it has small angular spread.

Answer

Answer: d


7. Two slits in Young’s double slit experiment have widths in the ratio 81 :1. The ratio of the amplitudes of light waves is
(a) 3 :1
(b) 3 : 2
(c) 9 :1
(d) 6:1

Answer

Answer: c


8. When interference of light takes place
(a) energy is created in the region of maximum intensity
(b) energy is destroyed in the region of maximum intensity
(c) conservation of energy holds good and energy is redistributed
(d) conservation of energy does not hold good

Answer

Answer: c


9. In a double slit interference pattern, the first maxima for infrared light would be
(a) at the same place as the first maxima for green light
(b) closer to the centre than the first maxima for green light
(c) farther from the centre than the first maxima for green light
(d) infrared light does not produce an interference pattern

Answer

Answer: c


10. To observe diffraction, the size of the obstacle
(a) should beX/2, where X is the wavelength.
(b) should be of the order of wavelength.
(c) has no relation to wavelength.
(d) should be much larger than the wavelength.

Answer

Answer: b


11. The angular resolution of a 10 cm diameter telescope at a wavelength of 5000 A is of the order of
(a) 106 rad
(b) 10-2 rad
(c) 10-4 rad
(d) 10-6 rad

Answer

Answer: d


12. The velocity of light in air is 3 * 108 ms-1 and that in water is 2.2 * 108 ms” . The polarising angle of incidence is
(a) 45°
(b) 50°
(c) 53.74°
(d) 63

Answer

Answer: c


13. An optically active compound
(a) rotates the plane of polarised light
(b) changes the direction of polarised light
(c) does not allow plane polarised light to pass through
(d) none of these

Answer

Answer: a


We hope the given Physics MCQs for Class 12 with Answers Chapter 10 Wave Optics will help you. If you have any query regarding CBSE Class 12 Physics Wave Optics MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 9 Ray Optics and Optical Instruments

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 9 Ray Optics and Optical Instruments. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Ray Optics and Optical Instruments MCQs Pdf with Answers to know their preparation level.

Ray Optics and Optical Instruments Class 12 Physics MCQs Pdf

1. A rod of length 10 cm lies along the principal axis of a concave mirror of focal length 10 ’em in such a way that its end closer to the pole is 20 cm away from the mirror. The length of the image is
(a) 10 cm
(b) 15 cm
(c) 2.5 cm
(d) 5 cm

Answer

Answer: d


2. For a total internal reflection, which of the following is correct?
(a) Light travels from rarer to denser medium.
(b) Light travels from denser to rarer medium.
(c) Light travels in air only.
(d) Light travels in water only.

Answer

Answer: b


3. Critical angle of glass is θ2 and that of water is θ2. The critical angle for water and glass surface would be (μg = 3/2, μw = 4/3).
(a) less than θ2
(b) between θ1 and θ2
(c) greater than θ2
(d) less than θ1

Answer

Answer: c


4. Mirage is a phenomenon due to
(a) refraction of light
(b) reflection of light
(c) total internal reflection of light
(d) diffraction of light.

Answer

Answer: c


5. A convex lens is dipped in a liquid whose refractive index is equal to the refractive index of the lens. Then its focal length will
(a) become zero
(b) become infinite
(c) become small, but non-zero
(d) remain unchanged

Answer

Answer: b


6. Which of the following forms a virtual and erect image for all positions of the object?
(a) Concave lens
(b) Concave mirror
(d) Convex mirror
(d) Both (a) and (c)

Answer

Answer: d


7. Two lenses of focal lengths 20 cm and – 40 cm are held in contact. The image of an object at infinity will be formed by the combination at
(a) 10 cm
(b) 20 cm
(c) 40 cm
(d) infinity

Answer

Answer: c


8. Two beams of red and violet color are made to pass separately through a prism (angle of the prism is 60°). In the position of minimum deviation, the angle of refraction will be
(a) 30° for both the colors
(b) greater for the violet color
(c) greater for the red color
(d) equal but not 30° for both the colors

Answer

Answer: a


9. Which of the following colours of white light deviated most when passes through a prism?
(a) Red light
(b) Violet light
(c) Yellow light
(d) Both (a) and (b)

Answer

Answer: b


10. An under-water swimmer cannot see very clearly even in absolutely clear water because of
(a) absorption of light in water
(b) scattering of light in water
(c) reduction of speed of light in water
(d) change in the focal length of eye lens

Answer

Answer: d


11. An astronomical refractive telescope has an objective of focal length 20 m and an eyepiece of focal length 2 cm. Then
(a) the magnification is 1000
(b) the length of the telescope tube is 20.02 m
(c) the image formed of inverted
(d) all of these

Answer

Answer: d


We hope the given Physics MCQs for Class 12 with Answers Chapter 9 Ray Optics and Optical Instruments will help you. If you have any query regarding CBSE Class 12 Physics Ray Optics and Optical Instruments MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 8 Electromagnetic Waves

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 8 Electromagnetic Waves. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Electromagnetic Waves MCQs Pdf with Answers to know their preparation level.

Electromagnetic Waves Class 12 Physics MCQs Pdf

1. Maxwell in his famous equations of electromagnetism introduced the concept of
(a) ac current
(b) displacement current
(c) impedance
(d) reactance

Answer

Answer: b


2. The conduction current is same as displacement current when source is
(a) ac only
(b) dc only
(c) either ac or dc
(d) neither dc nor ac

Answer

Answer: c


3. If a variable frequency ac source is connected to a capacitor then with decrease in frequency the displacement current will
(a) increase
(b) decrease
(c) remains constant
(d) first decrease then increase

Answer

Answer: b


4. An electromagnetic wave can be produced, when charge is
(a) moving with a constant velocity
(b) moving in a circular orbit
(c) falling in an electric field
(d) both (b) and (c)

Answer

Answer: d


5. Which of the following statement is false for the properties of electromagnetic waves?
(a) Both electric and magnetic field vectors attain the maxima and minima at the same place and same time.
(b) The energy in electromagnetic waves is divided equally between electric and magnetic field vectors.
(c) Both electric and magnetic field vectors are parallel to each other and perpendicular to the direction of propagation of wave.
(d) These waves do not require any material medium for propagation.

Answer

Answer: c


6. Which of the following has/have zero average value in a plane electromagnetic wave?
(a) Both magnetic and electric fields
(b) Electric field only
(c) Magnetic field only
(d) None of these

Answer

Answer: a


7. A charged particle oscillates about its mean equilibrium position with a frequency of 109 Hz. The frequency of electromagnetic waves produced by the oscillator is
(a) 106 Hz
(b) 107 Hz
(c) 108 Hz
(d) 109 Hz

Answer

Answer: d


8. If E and B denote electric and magnetic fields respectively, which of the following is dimensionless?
Physics MCQs for Class 12 with Answers Chapter 8 Electromagnetic Waves

Answer

Answer: a


9. The ultra high frequency band of radio waves in electromagnetic wave is used as in
(a) television waves
(b) cellular phone communication
(c) commercial FM radio
(d) both (a) and (c)

Answer

Answer: b


10. The waves used by artificial satellites for communication is
(a) microwaves
(b) infrared waves
(c) radio waves
(d) X-rays

Answer

Answer: a


11. Which of the following electromagnetic waves is used in medicine to destroy cancer cells?
(a) IR-rays
(b) Visible rays
(c) Gamma rays
(d) Ultraviolet rays

Answer

Answer: c


We hope the given Physics MCQs for Class 12 with Answers Chapter 8 Electromagnetic Waves will help you. If you have any query regarding CBSE Class 12 Physics Electromagnetic Waves MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 7 Alternating Current. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Alternating Current MCQs Pdf with Answers to know their preparation level.

Alternating Current Class 12 Physics MCQs Pdf

1. Alternating voltage (V) is represented by the equation
(a) V(t) = Vm eωt
(b) V(t) = Vm sin ωt
(c) V(t) = Vm cot ωt
(d) V(t) = Vm tan ωt

Answer

Answer: b


2. The rms value of potential difference V shown in the figure is
Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current 1

Answer

Answer: c


3. The phase relationship between current and voltage in a pure resistive circuit is best represented by
Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current 2
Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current 3

Answer

Answer: b


4. In the case of an inductor
(a) voltage lags the current by \(\frac{π}{2}\)
(b) voltage leads the current by \(\frac{π}{2}\)
(c) voltage leads the current by \(\frac{π}{3}\)
(d) voltage leads the current by \(\frac{π}{4}\)

Answer

Answer: b


5. Which of the following graphs represents the correct variation of inductive reactance XL with frequency u?
Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current 4

Answer

Answer: b


6. In a pure capacitive circuit if the frequency of ac source is doubled, then its capacitive reactance will be
(a) remains same
(b) doubled
(c) halved
(d) zero

Answer

Answer: c


7. Which of the following graphs represents the correct variation of capacitive reactance Xc with frequency v u?
Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current 5

Answer

Answer: c


8. In an alternating current circuit consisting of elements in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?
(a) Only resistor
(b) Resistor and inductor
(c) Resistor and capacitor
(d) Only inductor

Answer

Answer: c


9. In which of the following circuits the maximum power dissipation is observed?
(a) Pure capacitive circuit
(b) Pure inductive circuit
(c) Pure resistive circuit
(d) None of these

Answer

Answer: c


10. In series LCR circuit, the phase angle between supply voltage and current is
Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current 6

Answer

Answer: a


11. In a series LCR circuit the voltage across an inductor, capacitor and resistor are 20 V, 20 V and 40 V respectively. The phase difference between the applied voltage and the current in the circuit is
(a) 30°
(b) 45°
(c) 60°
(d) 0°

Answer

Answer: d


12. At resonance frequency the impedance in series LCR circuit is
(a) maximum
(b) minimum
(c) zero
(d) infinity

Answer

Answer: b


13. At resonant frequency the current amplitude in series LCR circuit is
(a) maximum
(b) minimum
(c) zero
(d) infinity

Answer

Answer: a


14. Quality factor and power factor both have the dimensions of
(a) time
(b) frequency
(c) work
(d) angle

Answer

Answer: d


15. The natural frequency (ca0) of oscillations in LC circuit is given by
Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current 7

Answer

Answer: c


16. A transformer works on the principle of
(a) self induction
(b) electrical inertia
(c) mutual induction
(d) magnetic effect of the electrical current

Answer

Answer: c


17. For an ideal-step-down transformer, the quantity which is constant for both the coils is
(a) current in the coils
(b) voltage across the coils
(c) resistance of coils
(d) power in the coils

Answer

Answer: d


We hope the given Physics MCQs for Class 12 with Answers Chapter 7 Alternating Current will help you. If you have any query regarding CBSE Class 12 Physics Alternating Current MCQs Pdf, drop a comment below and we will get back to you at the earliest.

Physics MCQs for Class 12 with Answers Chapter 6 Electromagnetic Induction

Free PDF Download of CBSE Physics Multiple Choice Questions for Class 12 with Answers Chapter 6 Electromagnetic Induction. Physics MCQs for Class 12 Chapter Wise with Answers PDF Download was Prepared Based on Latest Exam Pattern. Students can solve NCERT Class 12 Physics Electromagnetic Induction MCQs Pdf with Answers to know their preparation level.

Electromagnetic Induction Class 12 Physics MCQs Pdf

1. The north pole of a long bar magnet was pushed slowly into a short solenoid connected to a short galvanometer. The magnet was held stationary for a few seconds with the north pole in the middle of the solenoid and then withdrawn rapidly. The maximum deflection of the galvanometer was observed when the magnet was
(a) moving towards the solenoid
(b) moving into the solenoid
(c) at rest inside the solenoid
(d) moving out of the solenoid

Answer

Answer: d


2. The magnetic flux linked with a coil of N turns of area of cross section A held with its plane parallel to the field B is
Physics MCQs for Class 12 with Answers Chapter 6 Electromagnetic Induction 1

Answer

Answer: d


3. Faraday’s laws are consequence of the conservation of
(a) charge
(b) energy
(c) magnetic field
(d) both (b) and (c)

Answer

Answer: b


4. Two identical coaxial coils P and Q carrying equal amount of current in the same direction are brought nearer. The current in
(a) P increases while in Q decreases
(b) Q increases while in P decreases
(c) both P and Q increases
(d) both P and Q decreases

Answer

Answer: d


5. Direction of current induced in a wire moving in a magnetic field is found using
(a) Fleming’s left hand rule
(b) Fleming’s right hand rule
(c) Ampere’s rule
(d) Right hand clasp rule

Answer

Answer: b


6. Lenz’s law is a consequence of the law of conservation of
(a) charge
(b) energy
(c) induced emf
(d) induced current

Answer

Answer: b


7. A solenoid is connected to a battery so that a steady current flows through it. If an iron core is inserted into the solenoid, the current will
(a) increase
(b) decrease
(c) remain same
(d) first increase then decrease

Answer

Answer: b


8. Which of the following statements is not correct?
(a) Whenever the amount of magnetic flux linked with a circuit changes, an emf is induced in circuit.
(b) The induced emf lasts so long as the change in magnetic flux continues.
(c) The direction of induced emf is given by Lenz’s law.
(d) Lenz’s law is a consequence of the law of conservation of momentum.

Answer

Answer: d


9. There is a uniform magnetic field directed perpendicular and into the plane of the paper. An irregular shaped conducting loop is slowly changing into a circular loop in the plane of the paper. Then
(a) current is induced in the loop in the anti-clockwise direction.
(b) current is induced in the loop in the clockwise direction.
(c) ac is induced in the loop.
(d) no current is induced in the loop.

Answer

Answer: a


10. In the given figure current from A to B in the straight wire is decreasing. The direction of induced current in the loop is A
Physics MCQs for Class 12 with Answers Chapter 6 Electromagnetic Induction 2
(a) clockwise
(b) anticlockwise
(c) changing
(d) nothing can be said

Answer

Answer: b


11. The north pole of a bar magnet is rapidly introduced into a solenoid at one end (say A). Which of the following statements correctly depicts the phenomenon taking place?
(a) No induced emf is developed.
(b) The end A of the solenoid behaves like a south pole.
(c) The end A of the solenoid behaves like north pole.
(d) The end A of the solenoid acquires positive potential.

Answer

Answer: c


12. A metal plate can be heated by
(a) passing either a direct or alternating current through the plate.
(b) placing in a time varying magnetic field.
(c) placing in a space varying magnetic field, but does not vary with time.
(d) both (a) and (b) are correct.

Answer

Answer: d


13. Identify the wrong statement.
(a) Eddy currents are produced in a steady magnetic field.
(b) Eddy currents can be minimized by using laminated core.
(c) Induction furnace uses eddy current to produce heat.
(d) Eddy current can be used to produce braking force in moving trains.

Answer

Answer: a


14. Which of the following does not use the application of eddy current?
(a) Electric power meters
(b) Induction furnace
(c) LED lights
(d) Magnetic brakes in trains

Answer

Answer: c


15. If number of turns in primary and secondary coils is increased to two times each, the mutual inductance
(a) becomes 4 times
(b) becomes 2 times
(c) becomes A times
(d) remains unchanged 4

Answer

Answer: a


16. When the rate of change oic current is unity, the induced emf is equal to
(a) thickness of coil
(b) number of turns in coil
(c) coefficient of self inductance
(d) total flux linked with coil

Answer

Answer: c


17. Two inductors of inductance .L each are connected in series with opposite? magnetic fluxes. The resultant inductance is
(Ignore mutual inductance)
(a) zero
(b) L
(c) 2L
(d) 3L

Answer

Answer: c


We hope the given Physics MCQs for Class 12 with Answers Chapter 6 Electromagnetic Induction will help you. If you have any query regarding CBSE Class 12 Physics Electromagnetic Induction MCQs Pdf, drop a comment below and we will get back to you at the earliest.