WBJEE Physics Test - 6 - JEE MCQ

A spherical ball contracts in volume by 0.01% when subjected to a normal uniform pressure of 100 atmospheres. The bulk modulus of its material in dyne/cm² is

A 220 V, 50 Hz a.c. source is connected to an inductance of 0.2 H and a resistance of 2 Ω in series. What is current in the circuit ?

Minimum no. of 8 μF and 250 V capacitors, used to make a combination of 16 μF and 1000 V, is

The value of g on the earth's surface is 980 cm/sec². Its value at a height of 64 km from the earth's surface is

A bomb of mass 30 kg at rest explodes into two pieces of masses 18 kg and 12 kg. The velocity of 18 kg mass is 6 m−s^⁻1. The kinetic energy of the other mass is

The Torque acting on a current carrying coil placed in a magnetic field is given by

A galvanometer of range 10 mA has a coil of resistance 1 Ω. To use it as a voltmeter of range 10 V, the resistance that must be connected in series with it, is

The magnetic lines of force inside a bar magnet

By which velocity a ball be projected vertically so that the distance covered by it in 5th second is twice the distance it covers in its 6th second (g=10 m/s²)

A coin, placed on a rotating turn-table slips, when it is placed at a distance of 9 cm from the centre. If angular velocity of the turn-table is trippled, it will just slip if its distance from the centre is

Two equal charges q each are placed at a distance of 2a. If a third charge-2q is placed at the mid-point, then potential energy of the system is

Which of the following is an example of motion in three dimensions?

The nucleus of ₅₆Ba¹⁴¹ contains ---- neutrons

A U-tube contains water and methylated spirit seperated by mercury. The mercury columns in the two arms are in level with 18 cm of water in one arm and 20 cm spirit in the other arm. The density of spirit is (Density of water=1 g-cm^-3)

The length of second pendulum on the earth where g is 9.8 m/s² is 1m. The length of a second pendulum on aplanet where = 4.9 m/s² will be

A particle is viberating in a simple harmonic motion with an amplitude of 4 cm. At what displacement from the equilibrium position, is its energy half potential and kinetic ?

A glass slab is placed in the path of convergent light. The point of convergence of light

A cylindrical solid of mass M has radius R and length L. Its moment of inertia about a generator is

A constant torque of 1000 N-m turns a wheel of moment of inertia 200 kg-m² about an axis through its centre. Angular velocity of the wheel after 3 s will be

At room temperature, a p-type semiconductor has

When a Van der Waals' gas undergoes free expansion then its temperature

Electrical conductivity of a semiconductor

A mountain climber finds that water boils at 80ºC. The temperature of this boiling water on Fahrenheit scale is

Curie is a unit of

In Young's double slit experiment, an interference pattern is obtained on a screen by a light of wavelength 6000 Å coming from the coherent sources S₁ and S₂. At certain point P on the screen third dark fringe is formed. Then the path difference S_1p − S_2p   in microns is

A particle is projected at an angle of 45º with the horizontal. The kinetic energy of the particle, at the highest point in its flight, is (where K is initial kinetic energy of the particle)

If   represent the sides AB and BC of a regular hexagon ABCDEF, then the vector   equals