The unofficial answer key for the KCET 2024 Physics paper has been released by subject experts and coaching institutes. The Physics paper typically consists of 60 questions, each carrying one mark, with a total score of 60 marks.
Candidates can access the unofficial answer key in PDF format or refer to the table provided below to calculate their score before the official answer key is released.
It’s important to note that while the unofficial answer key can help candidates cross-check their responses and estimate their scores, it may not be entirely accurate as it is not released by the exam conducting authority of the Karnataka Examination Authority (KEA).
Once the KEA releases the official answer key, candidates should compare their answers with it to obtain a clearer understanding of their performance and expected scores in the Physics paper of the KCET 2024 exam.
Candidates can download the KCET 2024 Unofficial Physics Answer key in PDF format:
| KCET Physics Answer Key (Unofficial) | Click Here to Download |
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KCET 2024 Physics Answers for All Questions (Unofficial)
| S.NO | Questions | Answers |
| 1. | The ratio of molar-specific heats of oxygen is (A) 1.4 (B) 1.67 (C) 1.33 (D) 1.28 | A (1.4) |
| 2. | For a particle executing simple harmonic motion (SHM), at its mean position (A) Velocity is zero and acceleration is maximum (B) Velocity is maximum and acceleration is zero (C) Both velocity and acceleration are maximum (D) Both velocity and acceleration are zero | B(Velocity is maximum and acceleration is zero) |
| 3. | A motor-cyclist moving towards a huge cliff with a speed of 18 kmh-1, blows a horn of source frequency 325 Hz. If the speed of the sound in air is 330 ms-1, the number of beats heard by him is (A) 5 (B) 4 (C) 10 (D) 7 | B(4) |
| 4. | A body has a charge of ~3.24μC . The numberof excess electrons it has is (A) 5.12 x 1025 (B) 5 x 1012 (C)2 x 1013 (D)5.12 x 1013 | C(2 x 1013 ) |
| 5. | A point charge A of +104μC and another pointcharge B of +204μC are kept 1m apart in freespace. The electrostatic ore on A due 1B isF1 and the electrostatic force on B due to A is F2 Then (A)F1 = -2F2 (B)F1 = -F2 (C)2F1 = -F2 (D)F1 = F2 | B(F1 = -F2 ) |
| 6. | A uniform electric field E = 3 x 105NC-1 is acting along the positive Y-axis. The electric flux through a rectangle of area 10cm x 30cm whose plane is parallel to the Z-X plane is (A)12 x 103 Vm (B) 9 x 103 Vm (C)15 x 103 Vm (D)18 x 103 Vm | B( 9 x 103 Vm) |
| 7. | The total electric flux through a closed spherical surface of radius ‘r’ enclosing an electric dipole of dipole moment 2aq is (Give e0 = permittivity of free space) (A) Zero (B) q/e0 (C) 2q/e0 (D) 8Ï€r2q/e0 | A(Zero) |
| 8. | Under electrostatic condition of a charged conductor, which among the following statements is true? (A) The electric field on the surface of a charged conductor is σ/ 2 e0, where is the surface charge density (B) The electric potential inside a charged conductor is always zero (C) Any excess charge resides on the surface of the conductor (D) The net electric filed is tangential to the surface of the conductor | C(Any excess charge resides on the surface of the conductor) |
| 9. | A cube of side 1 cm contains 100 molecules each having an induced dipole moment of 6 0.2 10-6 C – m in an external electric field of 1 4NC . The electric susceptibility of the materials is_____ C2 N-1 m-2 (A) 50 (B) 5 (C) 0.5 (D) 0.05 | B(5) |
| 10. | A capacitor of capacitance 5 μF is charged by a battery of emf 10V. At an instant of time, the potential difference across the capacitors is 4V and the time rate of change of potential difference across the capacitor is 0.6 1 Vs-1 . Then the time rate at which energy is stored the capacitor at the instant is (A) 12 μW (B) 3 μW (C) Zero (D) 30 μW | A(12 μW) |
| 11. | E is the electric field inside a conductor whose material has conductivity σ and resistivity . The current density inside the conductor is j . The correct form of Ohm’s law is (A) E = σ j (B) j = pE (C) E = pj (D) E.j = p | C(E = pj) |
| 12. | In the circuit shown, the end A is at potential V0 and end B is grounded. The electric current I indicated in the circuit is (A) V0 /R (B) 2V0/R (C) 3V0/R (D) V0/3R | D(V0/3R) |
| 13. | The electric current flowing through a given conductor varies with time as shown in the graph below. The number of free electrons which flow through a given cross-section of the conductor in the time interval 0 ≤ t ≤ 20s is (A) 3.125 x 1019 (B) 1.6 x 1019 (C) 6.25 x 1018 (D) 1.625 x 1018 | A(3.125 x 1019) |
| 14. | The I-V graph for a conductor at two different temperatures 1000 C and 0 4000 C is as shown in the figure. The temperature coefficient of resistance of the conductor is about (in per degree Celsius) (A) 3 x 10-3 (B) 6 x 10-3(C) 5 x 10-3(D) 12 x 10-3 | A( 3 x 10-3) |
| 15. | An electric blub of 60 W, 120 V is to be connected to 220 V source. What resistance should be connected in series with the bulb, so that the bulb glows properly? (A) 50Ω (B) 100Ω (C) 200Ω (D) 288Ω | C(200Ω) |
| 16. | In an experiment to determine the temperature coefficient of resistance of a conductor, a coil of wire X is immersed in a liquid. It is heated by an external agent. A meter bridge set up is used to determine resistance of the coil X at different temperatures. The balancing points measured at temperatures t1 = 00 C and t2 = 1000 C are 50 cm and 60 cm respectively. If the standard resistance taken out is S 4 in both trials, the temperature coefficient of the coil is (A) 0.050C-1 (B) 0.020C-1 (C) 0.0050C-1 (D) 2.00C-1 | C(0.0050C-1) |
| 17. | A moving electron produces (A) only electric filed (B) both electric and magnetic field (C) only magnetic field (D) neither electric nor magnetic field | B(both electric and magnetic field) |
| 18. | A coil having 9 turns carrying a current produces magnetic filed B1 at the centre. Now the coil is rewounded into 3 turns carrying same current. Then the magnetic field at the centre B2 (A) B1/9 (B) 9B1 (C) 3B1 (D) B1/ 3 | A(B1/9) |
| 19. | A particle of specific charge q/m =πC kg-1 is projected the origin towards positive x-axis with the velocity 10ms-1 in a uniform magnetic field B = -2kT. The velocity v of particle after time 1 t =1/ 12 s will be ( 1 in ms ) (A) 5(î + ĵ) (B) 5(î + √3ĵ) (C) 5(√3î + ĵ) (D) 5(√3î + ĵ) | D(5(√3î + ĵ)) |
| 20. | The magnetic field at the centre of a circular coil of radius R carrying current I is 64 times the magnetic field at a distance x on its axis from the centre of the coil. Then the value of x is (A) (R/ 4)√15 (B) R√3 (C) R / 4 (D) R√15 | D(R√15) |
| 21. | Magnetic hysterisis is exhibited by ________ magnetic materials. (A) only para (B) only dia (C) only ferro (D) both para and ferro | C(only ferro) |
| 22. | Magnetic susceptibility of Mg at 300 K is 18 x 10-5. What is its susceptibility at 200 K (A) 18 x 10-5 (B) 18 x 10-5 (C) 1.8 x 10-5 (D) 0.18 x 10-5 | C(1.8 x 10-5 ) |
| 23. | A uniform magnetic field of strength B 2mT exists vertically downwards. These magnetic field lines pass through a closed surface as shown in the figure. The closed surface consists of a hemisphere S1, a right circular cone S2 and a circular surface S3. The magnetic flux through and S2 are respectively (A) ΦS1 = – 20μWb,ΦS2 = +20μWb (B) ΦS1 = +20μWb,ΦS2 = +20μWb (C) ΦS1 = – 40μWb,ΦS2 = +40μWb (D) ΦS1 = +40μWb,ΦS2 = -40μWb | A(ΦS1 = – 20μWb,ΦS2 = +20μWb) |
| 24. | In the figure, a conducting ring of certain resistance is falling towards a current carrying straight long conductor. The ring and conductor are in the same plane. Then the (A) induced electric current is zero (B) induced electric current is anticlockwise (C) induced electric current is clockwise (D) ring will come to rest | C(induced electric current is clockwise) |
| 25. | An induced current of 2 A flows through a coil. The resistance of the coil is 10Ω . What is the change in magnetic flux associated with the coil in 1 ms ? (A) 0.2 x 10-2 Wb (B) 2 x 10-2 Wb (C) 22 x 10-2Wb (D) 0.22 x 10-2 Wb | B(2 x 10-2 Wb) |
| 26. | A square loop of side length ‘a ‘ is moving away from an infinitely long current carrying conductor at a constant speed ‘ v ‘ as shown. Let ‘ x ‘ be the instantaneous distance between the long conductor and side AB . The mutual inductance (M) of the square loop – long conductor pair changes with time t according to which of the following graphs? | Option C |
| 27. | Which of the following combinations should be selected for better tuning of an LCR circuit used for communication? (A) R 20Ω,L 1.5H,C 35μF (B) R 25Ω,L 2.5H,C 45μF (C) R 25Ω,L 1.5H,C 45μF (D) R 15Ω,L 3.5H,C 30μF | D(R 15Ω,L 3.5H,C 30μF) |
| 28. | In an LCR series circuit, the value of only capacitance C is varied. The resulting variation of resonance frequency f0 as a function of C can be represented as | Option C |
| 29. | The figure shows variation of R,XL and XC with frequency ‘ f ‘ in a series LCR circuit. Then for what frequency point is the circuit capacitive? (A) B (B) D (C) A (D) C | C(A) |
| 30. | Electromagnetic waves are incident normally on a perfectly reflecting surface having surface area A. If I is the intensity of the incident electromagnetic radiation and c is the speed of light in vacuum, the force exerted by the electromagnetic wave on the reflecting surface is (A) 2IA/c (B) IA/c (C) IA/2c (D) I/2Ac | A(2IA / c ) |
| 31. | The final image formed by an astronomical telescope is (A) real, erect and diminished (B) virtual, inverted and diminished (C) real, inverted and magnified (D) virtual, inverted and magnified | D(virtual, inverted and magnified) |
| 32. | If the angle of minimum deviation is equal to angle of a prism for an equilateral prism, then the speed of light inside the prism is _____ (A) 3 x 108 ms-1 (B) 2√3 x 108 ms-1 (C) √3 x 108 ms-1 (D) (√3 / 2) x 108 ms-1 | C(√3 x 108 ms-1) |
| 33. | A luminous point object O is placed at a distance 2R from the spherical boundary separating two transparent media of refractive indices n1 and n2 as shown, where R is the radius of curvature of the spherical surface. If n1 = 4 / 3, n2 = 3 / 2 and R = 10cm, the image is obtained at a distance from P equal to (A) 30 cm in the rarer medium (B) 30 cm in the denser medium (C) 18 cm in the rarer medium (D) 18 cm in the denser medium | A(30 cm in the rarer medium ) |
| 34. | An equiconvex lens of radius of curvature 14 cm is made up of two different materials. Left half and right half of vertical portion is made up of material of refractive index 1.5 and 1.2 respectively as shown in the figure. If a point object is placed at a distance of 40 cm , calculate the image distance (A) 25 cm (B) 50 cm (C) 35 cm (D) 40 cm | D(40 cm) |
| 35. | A galaxy is moving away from the Earth so that a spectral line at 600 nm is observed at 601 nm . Then the speed of the galaxy with respect to the Earth is (A) 500 km s-1 (B) 50 km s-1 (C) 200 km s-1 (D) 20 km s-1 | A( 500 km s-1) |
| 36. | Three polaroid sheets are co-axially placed as indicated in the diagram. Pass axes of the polaroids 2 and 3 make 300 and 900 with pass axis of polaroid sheet 1. If I0 is the intensity of the incident unpolarised light entering sheet 1, the intensity of the emergent light through sheet 3 is (A) zero (B) 3I0/32 (C) 3I0/8 (D) 3I0/16 | B( 3I0 / 32 ) |
| 37. | In Young’s double slit experiment, an electron beam is used to produce interference fringes of width 1. Now the electron beam is replaced by a beam of protons with the same experimental set-up and same speed. The fringe width obtained is 2. The correct relation between 1 and 2 is (A) β1 = β2 (B) No fringes are formed (C) β1 < β2 (D) β1 > β2 | D(No fringes are formed) |
| 38. | Light of energy E falls normally on a metal of work function E / 3. The kinetic energies K of the photo electrons are (A) K = 2E / 3 (B) K = E / 3 (C) 0 ≤ K ≤ 2E / 3 (D) 0 ≤ K ≤ E / 3 | C(0 ≤ K ≤ 2E / 3) |
| 39. | The photoelectric work function for photo metal is 2 4eV. Among the four wavelengths, the wavelength of light for which photoemission does not take place is (A) 200 nm (B) 300 nm (C) 700 nm (D) 400 nm | C(700 nm) |
| 40. | In alpha particle scattering experiment, if v is the initial velocity of the particle, then the distance of closest approach is d. If the velocity is doubled, then the distance of closest approach becomes (A) 4 d (B) 2 d (C) d/2 (D) d /4 | D(d / 4) |
| 41. | The ratio of area of first excited state to ground state of orbit of hydrogen atom is (A) 1:16 (B) 1:4 (C) 4:1 (D) 16:1 | D(16:1) |
| 42. | The ratio of volume of Al27 nucleus to its surface area is (Given R0 = 1.2 x 10-15 m) (A) 2.1 x 10-15 m (B) 1.3 x 10-15 m (C) 0.22 x 10-15 m (D) 1.2 x 10-15 m | D(1.2 x 10-15 m) |
| 43. |  | D(60) |
| 44. | The natural logarithm of the activity R of a radioactive sample varies with time t as shown. At t=0, there are N0 undecayed nuclei. Then N0 is equal to 2 [ Take e2 = 7.5 ] (A) 7,500 (B) 3,500 (C) 75,000 (D) 1,50,000 | C(75,000) |
| 45. | Depletion region in an unbiased semiconductor diode is a region consisting of (A) both free electrons and holes (B) neither free electrons nor holes (C) only free electrons (D) only holes | B(neither free electrons nor holes) |
| 46. | The upper level of valence band and lower level of conduction band overlap in the case of (A) silicon (B) copper (C) carbon (D) germanium | B(copper) |
| 47. | In the diagram shown, the Zener diode has a reverse breakdown voltage of VZ . The current through the load resistance R is IL . The current through the Zener diode is | D |
| 48. | A p -n junction diode is connected to a battery of emf 5.7 V in series with a resistant 5kΩ such that it is forward biased. If the barrier potential of the diode is 0.7 V, neglecting the diode resistance, the current in the circuit is (A) 1.14 mA (B) 1mA (C) 1A (D) 1.14A | B(1mA) |
| 49. | An athlete runs along a circular track of diameter 80m. The distance travelled and the magnitude of displacement of the athlete when he covers th (3 / 4)th of the circle is ( in m) (A) 60 ,40 √2 (B) 40 ,60 √2 (C) 120 ,80 √2 (D) 80 ,120 √2 | A( 60 ,40 √2) |
| 50. | Among the given pair of vectors, the resultant of two vectors can never be 3 units. The vectors are (A) 1 unit and 2 units (B) 2 units and 5 units (C) 3 units and 6 units (D) 4 units and 8 units | D(4 units and 8 units) |
| 51. | A block of certain mass is placed on a rough inclined plane. The angle between the plane and the horizontal is 300. The coefficients of static and kinetic frictions between the block and the inclined plane are 0.6 and 0.5 respectively Then the magnitude of the acceleration of the block is [Take g=10 ms-2] (A) 2 ms-2 (B) zero (C) 0.196 ms-2 (D) 0.67 ms-2 | B(zero) |
| 52. | A particle of mass 500 g is at rest. It is free to move along a straight line. The power delivered to the particle varies with time according to the following graph :The momentum of the particle at t=5s is (A) 2 √5Ns (B) 5 √2Ns (C) 5 Ns (D) 5.5 Ns | C(5 Ns) |
| 53. | Dimensional formula for activity of a radioactive substance is (A) M0L1T-1 (B)M0L-1T0 (C) M0L0T-1 (D) M-1L0T0 | C(M0L0T-1) |
| 54. | A ceiling fan is rotating around a fixed axle as shown. The direction of angular velocity is along _______. (A) ˆ j (B) ˆj (C) kˆ (D) -k | D(-k) |
| 55. | A body of mass 1 kg is suspended by a weightless string which passes over a frictionless pulley of mass 2 kg as shown in the figure. The mass is released from a height of 1.6m from the ground. With what velocity does it strike the ground? (A) 16 ms-1 (B) 8 ms-1 (C) 4 √2 ms-1 (D) 4 ms-1 | B(8 ms-1) |
| 56. | What is the value of acceleration due to gravity at a height equal to half the radius of the Earth, from its surface ? (A) 4.4 ms-2 (B) 6.5 ms-2 (C) zero (D) 9.8 ms-2 | A( 4.4 ms-2) |
| 57. | A thick metal wire of density and length ‘L’ is hung from a rigid support. The increase in length of the wire due to its own weight is (Y=Young’s modulus of the material of the wire) | B() |
| 58. | Water flows through a horizontal pipe of varying cross-section at a rate of 0.314 m3s-1 The velocity of water at a point where the radius of the pipe is 10 cm is (A) 0.1 ms-1 (B) 1 ms-1 (C) 10 ms-1 (D) 100 ms-1 | C( 10 ms-1) |
| 59. | A solid cube of mass m at a temperature θ0 is heated at a constant rate. It becomes liquid at temperature 1 and vapour at temperature θ2. Let s1 and s2 be specific heats in its solid and liquid states respectively. If Lf and Lv are latent heats of fusion and vaporisation respectively, then the minimum heat energy supplied to the cube until it vaporises is | C() |
| 60. | One mole of an ideal monoatomic gas is taken round the cyclic process MNOM. The work done by the gas is (A) 4.5 P0V0 (B) 4 P0V0 (C) 9 P0V0 (D) 2 P0V0 | D(2 P0V0) |
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