KCET Physics Answer Key 16 April 2025 (Available): Unofficial Key PDF Link

The unofficial KCET Physics Answer Key 16 April 2025 is available here. Candidates can use the unofficial answer key to evaluate their scores.

Mohith Kumar

Updated on -Apr 17, 2025 | 08:06 PM IST

KCET Physics Answer Key 16 April 2025: Unofficial Key PDF Link

Check the KCET Physics Answer Key 16 April 2025 Here (Image Credits: pixabay.com).

KCET Physics Answer Key 16 April 2025: As scheduled, the Karnataka Examination Authority (KEA) held the KCET 2025 Physics examination today, April 16, 2025. The examination was held from 10:30 AM to 11:50 AM. The KCET Physics question paper had a weightage of 60 marks. The exam was held in paper-based test (PBT) mode. Students who appeared for the KCET Physics 2025 examination and are eager to analyse their scores can check the unofficial KCET Physics Answer Key 16 April 2025 available here.

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KCET Physics Answer Key 16 April 2025: Questions and Answers (Live)

The KCET Physics 2025 questions and answers are given below.

Question 1: The variations of resistivity with absolute temperature for three different materials, X, Y, and Z, are shown in the graph below. Identify the materials X, Y and Z.
Answer: X-Copper, Y-Nichrome. Z-Semiconducter

Question 2: Given a current-carrying wire of non-uniform cross-section, which of the following is constant throughout the length of the wire?
Answer: Current, electric field and drift speed

Question 3: The graph between the variation of resistance of the wire as a function of its diameter, keeping other parameters like length and temperature constant, is
Answer: hyperbolic curve

Question 4: Two thin, long, parallel wires, separated by a distance 'd' carry a current of 'i' A in the same direction. They will
Answer: attract each other with a force of μ 0 i 2 / (2πd)

Question 5: A solenoid is I m long and 4 cm in diameter. It has five layers of windings of 1000 turns each and carries a current of 7A. The magnetic field at the centre of the solenoid is
Answer: 4.396 x 10 -2 T

Question 6: Two similar galvanometers are converted into an ammeter and a milliammeter. The shunt resistance of ammeter as compared to the shunt resistance of a milliammeter will be
Answer: more

Question 7: Which of the following statements is true in respect of diamagnetic substances?
Answer: Susceptibility is small and negative

Question 8: Identify the correct statement
(1) The direction of magnetic field due to a current element is given by Flemings Left Hand Rule
(2) The magnetic field inside a solenoid is non-uniform
(3) A current carrying conductor produces an electric field around it.
4) A straight current carrying conductor has circular magnetic field lines around it.
Answer: (2) A current carrying conductor produces an electric field around it.

Question 9: Which of the following graphs represents the variation of magnetic field B with perpendicular distance r from an infinitely long, straight conductor carrying current?
Answer: Option 4

Question 10: If we consider electrons and photons of same wavelength , then they will have same
Answer: Momentum

Question 11: The anode voltage of a photocell is kept fixed. The frequency of the light falling on the cathode is gradually increased. Then the correct graph which shows the variation of photo current I with the frequency of incident light is
Answer: Option (3)

Question 12: When a bar magnet is pushed towards the coil, along its axis, as shown in the figure, the galvanometer pointer deflects towards X. When this magnet is pulled away from the coil, the galvanometer pointer
Answer: delects towards x

Question 13: A square loop of side 2m lies in the V-Z plane in a region having a magnetic field B(51-3j-461. The magnitude of magnetic flux through the square loop is
Answer: 20 Wb

Question 14: In a domestic electric mains supply, the voltage and the current are
Answer: AC voltage and AC current

Question 15: A sinusoidal voltage produced by an AC generator at any instant t is given by an equation V-311 sin 314 t. The rms value of voltage and frequency are respectively
Answer: 220 V, 50 Hz

Question 16: A series LCR circuit containing an AC source of 100 has an inductor and a capacitor of reactances 2417 and 1612 respectively. If a resistance of 612 is connected in series, then the potential difference across the series combination of inductor and capacitor only is
Answer: 80V

Question 17: Match the following types of waves with their wavelength ranges
Answer: i -a, ii -d iii-b iv-c

Question 18: A ray of light passes from vacuum into a medium of refractive index n. If the angle of incidence is twice the angle of refraction, then the angle of incidence in terms of refractive index is
Answer: 2cos -1 (n/2)

Question 19: A convex lem has power P. It is cut into two halves along its principal axis. Further one piece (out of two halyes) is cut into two halves perpendicular to the principal axis as shown in figure. Choose the incorrect option for the reported lens pieces
Answer: Power of L 1 = P/2

Question 20: The image formed by an objective lens of a compound microscope is
Answer: Real and enlarged

Question 21: Let r and r′ denote the angles iniside an equilateral prism, as usual, in degrees. Consider that during some time interval from t=0 tot=t,r′ varies with time as r′=10+t2. During this time, r will vary as (assume that r and r′ are in degree)
Answer: 50−t 2

Question 22: If AB is incident plane wave front then refracted wave front is (n,n)
Answer: Option 2

Question 23: The total energy carried by the light wave when it travels from a rarer to a non-reflecting and non-absorbing medium
Answer: remains same

Question 24: If the radius of first Bohr orbit is r. then the radius of the second Bohr orbit will be
Answer: 4r

Question 25: Match the following types of nuclei with examples shown
Answer: a-iii, b-i, c-ii

Question 26: Which of the following statements is incorrect with reference to 'Nuclear force"?
Answer: The nuclear force is much weaker than the Coulomb force.

Question 27: The range of electrical conductivity (d) and resistivity (p) for metals, among the following, is
Answer: Option 2

Question 28: Which of the following statements is correct for an n-type semiconductor!
Answer: The donor level lies closely below the bottom of the conduction band

Question 29: The circuit shown in the figure contains two ideal diodes, D 1 and D 2 . If a cell of emf 3 V and negligible internal resistance is connected as shown, then the current through 70Ω resistance (in amperes) is
Answer: 0.03

Question 30: In determining the refractive index of a glass slab using a travelling microscope, the following readings are tabulated.
(a) Reading of travelling microscope for ink arm 5.123 cm
(b) Reading of travelling microscope for ink ma...hrough glass slab - 6.12.3 cm
(c) Reading of travelling microscope for chalk dust on glass slab - 8.12.3 cm
From the data, the refractive index of a glass slab is
Answer: 1.500

Question 31: In an experiment to determine the figure of merit of a galvanometer by the half deflection method, A student constructed the following circuit.
Answer: 103.0 Ω

Question 32: While determining the coefficient of viscosity of the given liquid, a spherical steel ball sinks by a distance h = 0.9 m. The radius of the ball is r = √3 x 10 -3 m. The time taken by the ball to sink in three trials are tabulated as follows.
Answer: 0.14 Pa.s

Question 33: Which of the following relation cannot be deduced using dimensional analysis ? [the symbols have their usual meanings]
Answer: v = ut + 1/2 at 2

Question 34: Two stones begin to fall from rest from the same height, with the second stone starting to fall Δt' seconds after the first falls from rest. The distance of separation between the two stones becomes 'H', t 0 ' seconds after the first stone starts its motion. Then t is equal to
Answer: H/gM + M/2

Question 35: In the projectile motion of a particle on a level ground. which of the following remains constant with reference to time and position?
Answer: Horizontal component of velocity

Question 36: A particle is in uniform circular motion. The equation of its trajectory is given by (x-2) 2 +y 2 = 25, where x and y are in meter. The speed ol the particle is 2 ms -1 . When the particle attains the lowest 'y' co-ordinate, the acceleration of the particle is (in ms -2 )
Answer: 0.8j

Question 37: A wooden block of mass M lies on a rough floor. Another wooden block of the same mass is hanging from the point O through strings as shown in the figure. To achieve equilibrium, the coefficient of static friction between the block on the floor with the floor itself is
Answer: μ= 10 θ

Question 38: A block of certain mass is placed on a rough floor. The coefficients of static and kinetic friction between the block and the floor are 0.4 and 0.25, respectively. A constant horizontal force F-20 N acts on it so that the velocity of the block varies with time according to the following graph The mass of the block is nearly (Take g = 10 ms -2 )
Answer: 4.4 kg

Question 39: A body of mass 0.25 kg travels along a straight line from 10 to 1-2 m with a speed u = kx where k2 Sl units. The work done by the net force during this displacement is
Answer: 4J

Question 40: During an elastic collision between two bodies, which of the following statements are correct?
I. The initial kinetic energy is equal to the final kinetic energy of the system.
II. The linear momentum is conserved.
III. The kinetic energy during At the collision time) is not conserved.
(1) I. II and III
(2) I and II only
(3) II and III only
(4) I and III only
Answer: I, II, and III

Question 41: Three particles of mass | kg. 2 kg and 3 kg are placed at the vertices A, B and C respectively of an equilateral triangle ABC of side I m. The centre of mass of the system from vertex A (located at
oriçin, is
Answer: [7/12, 3√3/12]

Question 42: Two fly wheels are connected by a non-slipping belt as shown in the figure.
1,4 kg m², r₁ = 20 cm, I, 20 kg m² and r₂= 30 cm. A torque of 10 Nm is applied on the smaller wheel. Then match the entries of column I with appropriate entries of column II.
Answer: a-iii, b-ii, c-i

Question 43: Angular momenta of a planet...
Answer: rP

Question 44: The total energy of a satellite in a circular orbit at a distance (R + h) from the center of the Earth varies as [ R is the radius of the Earth and h is the height of the orbit from Earth's surface]
Answer: -1/(R + h)

Question 45: Two wires A and B are made of same material. Their diameters are in the ratio of 1: 2 and lengths are in the ratio of 1: 3 . If they are stretched by the same force, then increase in their lengths will be in the ratio of
Answer: 4:3

Question 46: A horizontal pipe carries water in a streamlined flow. At a point along the pipe, where the cross-sectional area is 2 10 cm, the velocity of water is 1 ms -1 and the pressure is 2000 Pa. What is the pressure of water at another point where the cross-sectional area is 5 cm 2 ? [Density of water 3 1000kgm -1 ]
Answer: 500 Pa

Question 47: Three metal rods of the same material and identical in all respects are joined as shown in the figure. The temperatures at the ends of these rods are maintained as indicated. Assuming no heat energy loss occurs through the curved surfaces of the rods, the temperature at the junction x is
Answer: 60 degree C

Question 48: A gas is taken from state A to state B along two different paths 1 and 2. The heat absorbed and work done by the system along these two paths are Q 1 and Q 2 , and W 1 and W 2 respectively. Then
Answer: Q 1 - W 1 = Q 2 -W 2

Question 49: At 27 degrees Celsius, the mean kinetic energy of the atoms of an ideal gas is E 1 . If the temperature is increased to 327 degrees Celsius, then the mean kinetic energy of the atoms will be
Answer: 2E 1

Question 50: The variations of kinetic energy K(x), potential energy U(x) and total energy as a function of displacement of a particle in SHM is as shown in the figure. The value of |x 0 | is
Answer: A/√2

Question 51: The angle between the particle velocity and wave velocity in a transverse wave is [except when the particle passes through the mean position]
Answer: π/2 radian

Question 52: A metallic sphere of radius R carrying a charge q is kept at certain distance from another metallic sphere of radius R /4 carrying a charge Q. What is the electric flux at any point inside the metallic sphere of radius R due to the sphere of radius R /4 ?
Answer: Zero

Question 53: You are given a dipole of charge +q and -q separated by a distance 2R . A sphere 'A' of radius 'R' passes through the centre of the dipole as shown below and another sphere 'B' of radius '2R' passes through the charge +q. Then the electric flux through the sphere A is
Answer: -q/e 0

Question 54: A potential at a point A is -3 V and that at another point B is 5V. What is the work done in carrying a charges of 5 m C from B to A?
Answer: -0.04 J

Question 55: Charges are uniformly spread on the surface of a conducting sphere. The electric field from the centre of sphere to a point outside the sphere varies with distance r from the centre as
Answer: Option (3)

Question 56: Match the following. Angle between P and E
Answer: a-ii, b-iii, c-iv

Question 57: Which of the following statements is not true?
1) Work done to move a charge on an equipotential surface is not zero
2) Equipotential surfaces are the surfaces where the potential is constant
3) Equipotential surfaces for a uniform electric field are parallel and equidistant from each other.
4) Electric field is always perpendicular to an equipotential surface
Answer: Work done to move a charge on an equipotential surface is not zero

Question 58: Which of the following is a correct statement ?
1) Gauss’s law is true for any open surface
2) Gauss's law is not applicable when charge are not symmetrically distributed over a closed surface
3) Gauss’s law does not hold good for a charge situated outside Gaussian surface
4) Gauss’s law is true for any closed surface
Answer: Gauss’s law is true for any closed surface

Question 59: In the following circuit, the terminal voltage across the cell is
Answer: 1.95 V

Question 60: Two cells of emfs E 1 and E 2 and internal resistances r 1 and r 2 (E 2 >E 1 and r 2 > r 1) respectively, are connected in parallel as shown in figure. The equivalent emf of the combination is E eq Then
Answer: Option 4

The above available KCET Physics Answer Key 16 April 2025 is taken from the Collegedekho official website.

KCET Physics Answer Key 16 April 2025: PDF Link

The PDF link to download the KCET unofficial Physics Answer Key 2025 is given in the table below.

KCET Physics Answer Key 16 April 2025 PDF Link (to be added)

The KCET Physics Answer Key 16 April 2025 available here is completely unofficial and must be used only for personal reference. Any errors/discrepancies in the KCET Physics Unofficial Answer Key 16 April 2025 are deeply regretted. Visit the official website of KEA for more updates.

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