WBJEE Physics Answer Key 2025 Unofficial (OUT) for all Sets
Supreeta Roy
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For all sets, access WBJEE Physics Answer Key 2025 unofficial to calculate your scores before the announcement of the official key. The Physics section comprises a total of 40 questions of 50 marks.
WBJEE Physics Answer Key 2025 Unofficial: As WBJEE Physics 2025 examination has been concluded on April 27, at 4 PM, candidates can check out WBJEE Physics Answer Key 2025 on the page below. The answer key is provisional in nature, and has been provided by our subject experts after collecting the question paper from the candidates. All 40 questions have been mentioned, along with their provisional answers to help applicants understand if they can pass the examination and what score they are likely to get. The official answer key will be released by WBJEE Board soon; till then, candidates can take this as a reference to determine their score, rank, and shortlist colleges that are likely to accept the rank corresponding to their expected score for UG engineering admission.
Also Read |WBJEE Unofficial Answer Key 2025 LIVE Updates
WBJEE Physics Answer Key 2025 Unofficial
The unofficial answer key for WBJEE 2025 will be provided below in a set-wise PDF format for students to download and verify their answers.
| Sr.No. (Not Q.No.) | Question | Answer |
| 1 | quantity X is given by ε0 Δv/Δt, where ε0 is the permittivity of free space, L is the length, ΔV a potential difference and Δt is a time interval. The dimension of X is same as that of | Current |
| 2 | Six vectors a,b,c,d, e and I have the magnitudes and directions indicated in the figure. Which of the following statements is true? | d+e=f |
| 3 | The velocity-time graph for a body of mass 10kg is shown in the figure. Wek done on the body in the first two seconds of motion is | -4500 |
| 4 | Acceleration-time (a-1) graph of a body is shown in the figure. Corresponding velocity-time (y-1) graph in | |
| 5 | For an ideal gas, a cyclic prooms ABCA as shown in P-T diagram, when presented in PV plot, it should be | |
| 6 | The steel wire is fixed to the ceiling of an elevator moving op with an acceleration 2m/s2and a load of 10 kg bangs from the other end. If the cross section of the wire is 2 cm², then the lognitudal strain in the wire will be (g = 10 m/s² and Y=2.0 x10 N/m²) | 3x10-6 |
| 7 | The variation of density of a solid cylindrical rod of cross sectional area α and length Lis p= Po x2/L2where x is the distance from one end of the rod. The position of its centre of mass from the end (x=0 ) is | 3L/4 |
| 8 | The variation of displacement with time of a simple harmonic motion (SHM) for a particle of mass mis represented by y=2sin (πt/2+ϕ) cm. The maximum acceleration of the particle is | π2/2 cm/sec2 |
| 9 | Consider a particle of mass i1gm and charge 1.0 Coulomb at rest. Now the particle is subjected to an electric field E(t)= E0sinωt in the x-direction, where E0=2Newton/Coulombandω 1000 rad/sec. The maximum speed attained by the particle is | 2 m/sec |
| 10 | Figure shows the graph of angle of deviation & versus angle of incidence / for a light ray striking a prism. The prisen anglo is | 45 degrees |
| 11 | A particle of charge 'q' and mass 'm' moves in a circular orbit of radius 'r' with angular speed 'ω'. The ratio of the magnitude of its magnetic moment to that of its angular momentum depends on | q and cm |
| 12 | A simple pendulum is taken at a place where its distance from the earth's surface is equal to the radius of the earth. Calculate the time period of small oscillations if the length of the string is 4.0 (Take g = ms at the surface of the earth.) | 8 s |
| 13 | Two charges + qand-qare placed at points A and Il respectively which are at a distance 24 apart. Cis the mid point of A and &. The workdone in moving a charge+Qulong the semicircle CSD (W1) and along the line CBD (W2.) are | |
| 14 | The minimum force required to start pushing a body up a rough (having co-efficient of friction μ) Inclined plane is F1while the minimum force needed to preventit from sliding is F2.If the inclined planemakes an angle θ with the horizontal such that tanθ) =2μ, then the ratio F1/F2is | 3 |
| 15 | Which logic gate is represented by the following combinations of logic gates? | AND |
| 16 | What are the charges stored in the 1 µF and 2 µF capacitors in the circuit as shown in figure once the current (1) become steady | 4 µF and 8 µF |
| 17 | For a domestic AC supply of 220 V at 50 cycles ner sec, the potential difference between the terminals of a two-pin electric outlet in a room is given by | V(t)=220 √2Cos (100 πt) |
| 18 | Manufacturers supply a zmer diode with zamer voltage Vt, 5-6V and maximum power dissipation Ptmax=1/4 W. This Zener diode is used in the following circult, Calculate the minimum value of the resistance Rs, in the circuit so that the zener diode will not burn when the input voltage is Vin=10 V | 98.56 Ω |
| 19 | A didode is conncected in parallel with a resistance as shown in the figure. The most probable current (I)- Votage (v) characteristics is | |
| 20 | A single slit diffraction pattern is obtained using a beam of red light. If red light is replaced by blue light then | fringes will become narrower and crowded together. |
| 21 | Three different liquids are filled in a U-tube as shown in figure. Their densities are p₁. p2, and p3respectively. From the figure we may conclude that | p3= 2(p2-p1) |
| 22 | The de-Broglic wavelength of a moving bus with speed v is λ. Some passengers left the bus at a stoppage. Now when the bus moves with twice of its initial speed its kinetic energy is found to be twice of its initial value. What is the de-Broglie wavelength of the bus now? | λ |
| 23 | If the mass number and atomic number of 'X4' are 172 and 69 respectively. Then the atomic number and mass number of 'X' are | 72, 180 |
| 24 | The member of undecayed mici Nina sample of radioactive material as a function of time (t) down the figures. Which of the following graphsr correctly choose the relationship between N and activity (A). | |
| 25 | An electron in Hydrogen atom jumps from the second Bohr orbit to the ground state and the difference between the energics of the two states is radiated in the form of a photon. Th strikes a material. If the work function of the material is 4.2 eV, then the stopping potential is (Energy of electron in n-th orbit=-13.6/n2eV) | 6V |
| 26 | A force F= ai+bj+ck is acting on a body of mass m. The body was initially at rest at the origin. The co-ordinates of the body after time 'r' will be | at2/2m, bt2/2m, ct2/2m, |
| 27 | Ruma reached the metro station and found that the escalator was not working. She walked up the stationary escalator with velocity v, in time t₁. On other day if she remains stationary on the escalator moving with velocity v₂, then escalator takes her up in time t2. The time taken by her to walk up with elocity v on the moving escalator will be | t₁t2/(t2+t1) |
| 28 | A ball falls from a height h upon a fixed horizontal floor. The co-efficient of restitution for the collision between the ball and the floor is 'e'. The total distance covered by the ball before coming [neglect the air resistance] | 1+e2/1-e2 |
| 29 | The minimum wavelength of Lyman serias liness P, then the maximum wavelength of these lines | 4P/3 |
| 31 | The equation of a stationary wave along a stretched string is given by y= 5 sinπx/3 cos 40πt Here x and y are in cm and in second. The separation between two adjacent nodes in | 3 cm |
| 32 | Apiece of granite floats at the interface of mercury and water contained in a beaker as in figure. the densities of granite, water and mercury are p1, p2, and p3, respectively, the ratio of the volume of granite in want to the volume of granite in mercury is | p2-p1/ (p-p1) |
| 33 | The apparent coefficient of expansion of aliquid when heated in a copper vessel if C and when honted in silver vessel is S. if A is lineaf coctricient of expansion of copper, then linche toelficiens of expansion of silver is | (C+S+3A)/3 |
| 34 | Temperature of a body 0 is slightly more than the temperature of the surrounding θ0. Its rate of cooling (R) versus temperature of the body (0) is plotted. Its shape would be | |
| 35 | 1020photons of wavelength 660 nm are nm are emitted per second from a lamp. The wattage of the lamp is (planck's constant = 6.6 x 10-34Js) | 3W |
| 36 | If the dimensions of length are expressed as GxCyhz, where G, Cand h are the universal gravitational constant speed of light and Planck's constant respectively then | x=1/2, z=1/2 |
| 37 | Let the binding energy per nucleon of nucleus is denoted by 'Ebm' and radius of the nucleus denoted by 'r'. If mass number of nuclei A and B are 64 and 125 respectively, then | rA<rB |
| 38 | Two spheres S1, and, of masses m1, and m2, respectively collide with each other. Initially S1, is at rest and S2is moving with velocity v along axis. After collision S2has velocity v/2 in a direction perpendicular to the original direction. The sphere S1, moves after collision. | with a velocity of magnitude m2/m1 v √5/2 |
| 39 | A wave disturbance in a medium is described by y(x,t)= 0.02cos (50πt+π2) cos(10πx) where x, y are in meters and t is in seconds. whichs statemets is/are correct? | A node occurs at x = 0.15 m. |
| 40 | Let V, Vrms, Vp, denotes the mean speed, root mean square speed and most probable speed of the molecules such of mass m in an ideal monoatomic gas at absolute temperature T Kelvin. Which of teh seatements are correct? | Average kinetic energy of a molecule is 3/4 mV2p |
Also Read |WBJEE Result Expected Release Date 2025
Category 1 will comprise 30 questions. To determine scores, candidates need to assign one mark for every correct response provided under Category 1. For incorrect responses, candidates need to deduct 1/4th marks. In Categories 2 and 3, there will be five questions each. For correct responses in both categories, candidates must assign themselves 2 marks. For a negative response in Category 2, candidates need to minus ½ mark. There is no negative marking in Category 3.
WBJEE Subject-wise Answer Key 2025 Unofficial |
Subjects | PDF Download Links |
Mathematics | |
Chemistry |
WBJEE 2025 Expected Rank |
| Particulars | Links |
| Overall | WBJEE Expected Rank 2025 GMR and PMR |
| 100 Marks | WBJEE 100 Marks vs Expected Rank 2025 |
| 50 Marks | 50 Marks in WBJEE 2025 Expected Rank |
| 20 Marks | 20 Marks in WBJEE 2025 Expected Rank |
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