BITSAT Practice Test - 15 - JEE MCQ

The resistance of an ammeter is 13 Ω and its scale is graduated for a current upto 100A. After an additional shunt has been connected to this ammeter it becomes possible to measure currents upto 750A by this meter. The value of shunt resistance is

The appropriate material to be used in the construction of resistance boxes out the following is

An oxide coated filament is useful in vacuum tubes because essentially

In Thomson experiment of finding e/m for electrons, beam of electron is replaced by that of muons (particle with same charge as of electrons but mass 208 times that of electrons). No deflection condition in this case satisfied if

What is the unit of self inductance of a coil ?

A 80 μF capacitor in a defibrillator is charged to 100 V. The energy stored in the capacitor is sent through the patient during a pulse of duration 2 ms. The power delivered to the patient is

The capacitance of a parallel plate capacitor is 10 μF when distance between its plates is 8 cm. If distance between the plates is reduced to 4 cm, its capacitance will be

Pulling force making an angle θ to the horizontal is applied on a block of weight W placed on a horizontal table. If the angle of friction is α. then the magnitude of force required to move the body is equal to

A satellite whose mass is M, is revolving in circular orbit of radius r aroud the earth. Time of revolution of satellite is

0.1m³ of water at 80^o C is mixed with 0.3m³ of water at 60^o C . The final temperature of the mixture is

At a given volume and temperture, the pressure of a gas

A cyclotron oscillator frequency is 10 MHz. If radius of its dees 60 cm, then magnetic field for accelerating the protons is (Given e = 1.6 x 10^-19C, mp = 1.67 x 10^-27 kg)

If a substance is to be paramagnetic, its atoms must have a

The change in surface energy, when a drop of surface tension T and radius of R splits into 1000 droplets of radius r, is

In a container, the velocity of water flowing through a hole at a depth h from the surface of water is 5 m-s⁻¹. If the container has the hole at a depth 4h from the surface of water, then velocity of water flowing through the hole is

A copper wire of length 4 m and area of cross-section 1.2 cm² is stretched with a force of 4.8 x 10³ N. If the Young's modulus for copper is 1.2 x 10¹¹ N-m⁻², then increase in the length of the wire will be

A body, thrown upwards with some velocity, reaches the maximum height of 20 m. Another body with double the mass thrown up, with double initial velocity will reach a maximum height of

Which of the following does not represent a zero vector?

The parametric equations of a curve traced by a projectile on a certain planet with no surrounding are given by :y = (8t-5t²) metre and x = 6t metre, where t is in seconds. The velocity with which the projectile is projected, is

A parachutist of weight W strikes the ground with his logs fixed and comes to rest with an upward acceleration of magnitude '3g'. Force exerted on him by the ground during landing is

The hypermetropia is a

The kinetic energy of a particle executing simple harmonic motion is 16 J when it is in its mean position. If the amplitude of oscillation is 25 cm and the mass of the particle is 5.12 kg, the tme period of its oscillation is

The bob of a simple pendulum is a spherical hollow ball filled with water. A plugged hole near the bottom of the oscillating bob gets suddenly unplugged. During the observation, till water is coming out, the time period of oscillation would

With respect to air, critical angle in a medium for light of red colour [λ₁] is θ. Other facts remaining same, critical angle for light of yellow colour [λ₂] will be

A wheel having moment of inertia 2 kg-m² about its vertical axis, rotates at the rate of 60 rev-min⁻¹ about this axis. The torque, which can stop the wheel's rotation in one minute, would be

A mass of 2 kg tied to a string of 1m length is rotated in a vertical circle with a uniform speed of 4ms^-1. The tension in the string will be 52N, when the mass is at

Before jumping in water from above, a swimmer bends his body to