KCET Physics Unofficial Answer Key 2025 OUT: Set-wise questions with answer key solutions

KCET Physics Unofficial Answer Key 2025

KCET Physics Unofficial Answer Key 2025: The Karnataka Examinations Authority (KEA) has held the KCET Physics exam on April 16, 2025 , in various centers across the state. The exam started in the morning and finished at 11:50 AM sharp. The detailed solutions for all 60 questions are being added here one by one. Each question is worth 1 mark and there is no negative marking. Do note that all questions across all sets are the same but their order is shuffled . Hence, questions and answers are directly being added on this page so that students of all sets can follow. It is important to note that the official answer key will be published by the Karnataka Examinations Authority about a week after the exam. The overall weightage of the paper is 60 marks.

KCET Physics Unofficial Answer Key 2025

Access the unofficial answer key solutions for KCET 2025 Physics across all sets here and anticipate your scores. Since the multiple choice questions will be identical in all sets of the Physics question papers, candidates can review the answers by question. The order of the questions will vary in all sets.

Also Helpful | KCET Physics Paper Review 2025 (OUT)

Sr.No. (Not Q.No.)	Question	Answer
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.	X-Copper, Y-Nichrome. Z-Semiconducter
2	Given, a current-carrying wire of non-uniform cross-section, which of the following is constant throughout the length of wire?	Current, electric field and drift speed
3	The graph between variation of resistance of the wire as a function of its diameter keeping other parameters like length and temperature constant is	To be updated
4	Two thin, long, parallel wires, separated by a distance 'd' carry a current of 'i' A in the same direction. They will	attract each other with a force of μ 0 i 2 / (2πd)
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	4.396 x  10 -2 T
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	more
7	Which of the following statements is true in respect of diamagnetic substances?	Susceptibility is small and negative
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. 14) A straight current carrying conductor has circular magnetic field lines around it.	A current carrying conductor produces an electric field around it.
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?
10	If we consider electrons and photons of same wavelength , then they will have same	Momentum
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
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	delects towards x
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	20 Wb
14	In domestic electric mains supply, the voltage and the current are	AC voltage and AC current
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	220 V, 50 Hz
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	80V
17	Match the following types of waves with their wavelength ranges	i -a, ii -d iii-b iv-c
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	2cos -1 (n/2)
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	Power of L 1 = P/2
20	The image formed by an objective lens of a compound microscope is	Real and enlarged
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)	50−t 2
22	If AB is incident plane wave front then refracted wave front is (n,n)
23	The total energy carried by the light wave when it travels from a rarer to a non-reflecting and non-absorbing medium	remains same
24	If the radius of first Bohr orbit is r. then the radius of the second Bohr orbit will be	4r
25	Match the following types of nuclei with examples shown	A III, B I, C II
26	Which of the following statements is incorrect with reference to 'Nuclear force"?	The nuclear force is much weaker than the Coulomb force.
27	The range of electrical conductivity (d) and resistivity (p) for metals, among the following, is
28	Which of the following statements is correct for an n-type semiconductor!	The donor level lies closely below the bottom of the conduction band
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	0.03
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 (1)1.399 (2) 1.390 (3) 1.500 (4) 1.601	1.500
31	In an experiment to determine the figure of merit of a galvanometer by the half deflection method, A student constructed the following circuit. He unplugged a resistance of 5200 2 in R. When K 1 is closed and K 2 is open, the deflection observed in the galvanometer is 26 div. When K 2 is also closed and a resistance of 90Ω is removed in S, the deflection becomes 13 div. The resistance of galvanometer is nearly	103.0 Ω
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.	0.14 Pa.s
33	Which of the following relation cannot be deduced using dimensional analysis? [the symbols have their usual meanings]	v = ut + 1/2 at 2
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	H/gM  + M/2
35	In the projectile motion of a particle on a level ground. which of the following remains constant with reference to time and position?	Horizontal component of velocity
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 )	0.8j
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	μ= 10 θ
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 )	4.4 kg
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	4J
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	I. II and III
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	[7/12, 3√3/12]
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.	a-iii, b-ii, c-i
43
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]	-1/(R + h)
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	4:3
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 ]	500 Pa
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	60 degree C
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	Q 1 - W 1 = Q 2 -W 2
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	2E 1
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	A/√2
51	The angle between the particle velocity and wave velocity in a transverse wave is [except when the particle passes through the mean position]	π/2 radian
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 ?	Zero
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	-q/e 0
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?	-0.04 J
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
56		a-ii, b-iii, c-iv
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	Work done to move a charge on an equipotential surface is not zero
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	Gauss’s law is true for any closed surface
59	In the following circuit, the terminal voltage across the cell is	1.95 V
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

KCET Physics Question Paper 2025

Here, candidates can download question paper of KCET Physics 2025 exam in PDF format.

While waiting for the official KCET Physics 2025 answer key, candidates can use the unofficial answer key for KCET Physics 2024. This unofficial key can help them estimate their scores and understand how they might rank based on their performance. These solutions are created by qualified professionals and can be downloaded for easy access to a clear view of the answers for different versions of the question paper. Students must note that 1 mark for a correct attempt will be given. Furthermore, no deductions for incorrect attempts.

KCET Answer Key 2025 and Analysis Subject-Wise |

KCET Expected Marks vs Rank 2025 |

KCET Expected Rank vs Marks 2025 |

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