List of top Physics Questions asked in WBJEE

A train is moving along the tracks at a constant speed u. A girl on the train throws a ball of mass m straight ahead along the direction of motion of the train with speed v with respect to herself. Then,

A body of mass 2 kg moves in a horizontal circular path of radius 5m. In an instant its speed is \(2\sqrt5\) m/s and is increasing at the rate of 3 m/s².The magnitude of the force acting on the body at the instant is,

A ray of monochromatic light is incident on the plane surface of separation between two media X and Y with the angle of incidence 'i' in medium X and angle of refraction 'r' in medium Y. The given graph shows the relation between sin i and sin r. If V_x and V_y are the velocities of the ray in media X and Y respectively, Then which of the following is true?

An electric dipole of dipole moment p is placed at the origin of the coordinate system along the z-axis. The amount of work required to move a charge 'q' from the point (a,0,0) to the point (0,0,a) is

The figure shows two identical parallel plate capacitors A and B of capacitances C connected to a battery. The key K is initially closed. The switch is now opened and the free spaces between the plates of the capacitors are filled with a dielectric constant 3. Then which of the following statement(s) is/are true?

A uniform magnetic field b exists in a region. An electron of charge q and mass m moving with velocity v enters the region in a direction perpendicular to the magnetic field. Considering Bohr angular momentum quantization, which of the following statement(s) is/are true?

A charged particle of charge q and mass m is placed at a distance 2R from the center of a vertical cylindrical region of radius R where the magnetic field varies as \(\vec{B}=(4t^2-2t+6)k\), where t is time. Then which of the following statement(s) is/are true?

A cyclic process is shown in the p-v diagram and T-S diagram. Which of the following statement(s) is/are true?

A charged particle in a uniform magnetic field \(\vec{B}=B_0\hat{k}\) starts moving from the origin with velocity \(v=3\hat{i}+4\hat{k}\) m/s.The trajectory of the particle and the time \(t\) at which it reaches 2m above the x-y plane are 

A uniform rope of length 4 m and mass 0.4kg is held on a frictionless table in such a way that 0.6m of the rope is hanging over the edge. The work done to pull the hanging part of the rope onto the table is, (Assuming g=10m/s²) 

As shown in the figure, a liquid is at the same levels in two arms of a U-tube of uniform cross-section when at rest. If the U-tube moves with an acceleration 'f' towards the right,the difference in liquid heights between the two arms of the U-tube will be,(acceleration due to gravity=g)

X-rays of wavelength λ get reflected from parallel planes of atoms in a crystal with spacing d between two planes as shown in the figure. If the two reflected beams interfare constructively,Then the condition for maxima will be(n is the order of interference fringe)

A balloon starting from rest ascends from the ground with a uniform acceleration of 4 ft/sec². At the end of 5 sec, a stone is dropped from it. If t be the time to reach the stone to the ground and H is the height of the balloon when the stone goes to the floor, Then

In the given circuit, find the voltage drop V_L in the load resistance R_L

In an experiment on a circuit, as shown in the figure, the voltmeter shows 8V reading. The resistance of the voltmeter is 

In an experiment, the length of an object is measured to be 6.50 cm. This measured value can be written as 0.0650 m.The number of significant figures on 0.0650m is

Acceleration due to gravity at a height of H from the surface of a plane is the same as that at a depth of H below the surface.If R is the radius of the planet, then H vs. R graph for different planets will be

A given quantity of gas is taken from A to C in two ways; a) directly from A\(\rightarrow\)C along a straight line and b) in two steps, from A\(\rightarrow\)B and then from B\(\rightarrow\)C.Work done and heat absorbed along the direct path A\(\rightarrow\)C are 200J and 280J respectively. If the work done along A\(\rightarrow\)B\(\rightarrow\)C is 80J, then heat absorbed along the path is,

A circular coil is placed near a current-carrying conductor, both lying on the plane of the paper. The current is flowing through the conductor in such a way that the induced current in the loop is clockwise as shown in the figure. The current in the wire

 

A bar magnet falls from rest under gravity through the center of a horizontal ring of conducting wire as shown in the figure,

Which of the following graph best represents the speed (v) vs. time(t) graph of the bar magnet?

Consider the logic circuit with inputs A,B,C, and output Y. How many combinations of A, B and C give the output Y=0?

An amount of charge Q passes through a coil of resistance R.If the current in the coil decreases to zero at a uniform rate during time T, then the amount of heat generated in the coil will be,

Two base balls(masses; m₁=100g, and m₂=50g) are thrown. Both move with uniform velocity, but the velocity of m₂ is 1.5 times that of m₁.The ration of de Broglie wavelengths λ(m₁) : λ(m₂) is given by

There are n elastic balls placed on a smooth horizontal plane. The masses of the balls are m,\(\frac{m}{2}\),\(\frac{m}{2^2}\)........\(\frac{m}{2^{n-1}}\) respectively. If the first ball hits the second ball with velocity V₀, then the velocity of the n^th ball will be,