List of top Physics Questions asked in WBJEE JENPAS UG

When a spring is stretched by x amount, the potential energy stored in it is E. When the spring is stretched by another x amount, the potential energy stored in the spring becomes E'. Then \(\frac{E'}{E}\) is,

A conducting circular loop of radius 'a' and resistance R is kept on a horizontal plane. A vertical time-varying magnetic field B = 2t is switched on at time t = 0. Then which of the following statement(s) is/are correct?

When a force \(\overrightarrow F = xy²\hat i + x²y\hat j N\) acts on a particle and moves it along a straight line from the origin to the point (4, 0), the work done is,

Let \(\overrightarrow r_P(t)=3t\hat i+4t²\hat j\) and \(\overrightarrow r_Q(t)=4t^2\hat i+3t\hat j\) represent the positions of particles P and respectively as function of time t. The relative speed of the two particles at the instant t = 1 sec will be [consider \(\overrightarrow r_P(t)\) and \(\overrightarrow r_Q(t)\) are in metres and t is in seconds]

Consider the two different situations X and Y of two concentric coils of N₁ and N₂ turns and radii R₁ and R₂ respectively as shown above. If the magnetic field at O in situation X is B_x and in situation Y is B_y then B_x−B_y is

A particle is falling freely from height h to the ground. (Where h << R and R = Radius of the Earth). Which of the following figure most correctly depicts the acceleration ‘a’ of the particle as a function of time t (neglect air resistance)?

Five molecules of an ideal gas have velocities 2, 3, 4, 4 and 5 m/s. If their average velocity is \(\bar v\) and their RMS velocity is \(V_{rms}\) then

A convex lens of focal length 10 cm produces a five-times magnified real image of an object. What is the object distance ?

One mole of an ideal gas in initial state A undergoes a cyclic process ABCA as shown in the figure. If the pressure at A is \(P_0\), then which of the following statement(s) is/are correct?

A ray of light of wavelength λ incident at an angle 45° on the surface of a slab of ice of thickness 1 m is refracted into it at an angle of 30°. Speed of light in vacuum is c m/s. Then which of the following statement(s) is/are correct?

Two different coils have self-inductances L₁ = 8 mH and L₂ = 2 mH. Currents in both coils are increased at a same constant rate. Also, at a certain instant, the powers given to the two coils are same. If I₁, V₁, U₁ and I₂, V₂, U₂ represent the current, the induced voltage and the energy stored in the first coil and in the second coil respectively at any particular instant, then which of the following is/are correct?

A particle moves along x-axis following the relation x = 4(t-2)+a(1-2)², where x is the distance travelled in time t. In that case, which of the following statement(s) is/are true?

A thin uniform rod of length L and mass M is swinging freely about a horizontal axis passing through its end. Its maximum angular speed is ω. Its centre of mass rises to a maximum height of

The velocity \(v\) of a particle as a function of time t is given by \(v(t) = v_0 (1 – e^{–αt})\). The dimension of \(v_0/α\) is

The given figure shows the variation of pressure P versus density ρ for an ideal gas at two temperatures T₁ and T₂. Then,

A particle is moving in a straight line with simple harmonic motion of amplitude ‘A’. At a distance B from the mean position, the particle receives a blow in the direction of motion which instantaneously doubles the velocity. The new amplitude A' will be,

The variation of voltage V with charge Q of a capacitor is shown in the figure. The area of the triangle OAB represents,

As shown above, a hollow cylinder has a charge q within it. If Φ is the electric flux through the curved surface ‘B’, then the flux linked with the plane surface ‘A’ is,

An electron of mass m and a photon have same energy E. If their de Broglie wavelengths \(λ\) are \(λ_e\) and \(λ_p\), respectively, then \(\frac{λ_e}{λ_p}\) is proportional to,

An artificial satellite is moving in a circular orbit around the earth with a speed equal to half the magnitude of the escape velocity from the earth's surface. The height of the satellite above the earth's surface is [R = Radius of the earth]

Two coherent light sources A and B are at a distance 22 from each other ( A = wavelength). The minimum distance from B on the x-axis at which the interference is destructive is

A network of resistors of resistance R₁, and R₂ extends off to infinity to the right as shown in the figure. The total resistance of the network between points A and B if R₁ >> R₂ is

In a slide callipers, (m + 1) number of vernier divisions is equal to m number of smallest main scale divisions. If d unit is the magnitude of the smallest main scale division, then the vernier constant is

The energy level of a certain atom for 1^st 2^nd and 3^rd levels are \(\frac{4E}{3}\) 2E, respectively. If A and A be the wavelengths of emitted photon for 3→1 and 2 →1 transition respectively, then \(\frac{λ}{λ}\) is