SRMJEE Mock Test (Med) - 6 - JEE MCQ

A ball of mass 0.5 kg moving with a velocity of 2 m/sec strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force exerted by the wall on the ball is

Cathode rays and canal rays produced a certain discharge tube are deflected in the same direction of

An alternating voltage E=200 sin √2 sin (100t) volt is connected to a 1 μ F capacitor through an A.C. ammeter. The reading of ammeter is

A cell supplies a current of 0.9 A through a 2Ω resistor and a current of 0.3 A through a 7Ω resistor. The internal resistance of the cell is

There are two wires of same material and same length while the diameter of second wire is 2 times the diameter of first wire, then ratio of extension produced in the wires by applying same load will be

If a transistor amplifier has a gain of 20 dB, then the ratio of output to input power is

If n capacitors each of capacitance C are connected in series with a battery of V volt, then electrostatic energy stored in all the capacitors will be

A 30 kg box has to move up an inclined slope of 30^o to the horizontal at a uniform velocity of 5 m s ^{− 1} . If the frictional force retarding the motion is 150N, the horizontal force in newton to move up is (g = 10 m s ^{− 2} ).

A mass M is split into two parts, m and M-m, which are then separated by a certain distance. What ratio of m/M maximizes the gravitational force between the two parts

Suppose the sun expands, so that its radius becomes 100 times its present radius and its surface temperature becomes half of its present value. The total energy emitted by it will increase by a factor of

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

When two surfaces are coated with a lubricant, then they

The resistance of an ideal ammeter is

If a material, placed in a magnetic field is thrown out of it, then the material is

A capillary tube of radius r is immersed in water and water rise in it to a height h. Mass of water in capillary tube is m. If the radius of the tube is doubled, the mass of water that will rise in capillary will be

A man goes 10 m towards North, then 20m towards east then displacement is

A body is thrown horizontally from the top of a tower of height 5 m. It touches the ground at a distance of 10 m from the foot of the tower. The initial velocity of the body is (g = 10 ms^-2)

A rocket is propelled by a gas which is initially at a temperature of 4000 K. The temperature of the gas falls to 1000 K as it leaves the exhaust nozzle. The gas which will acquire the largest momentum while leaving the nozzle, is

The equation of motion of a simple harmonic oscillation is

The horizontal range of a projectile is 4√3 times the maximum height achieved by it, then the angle of projection is

The surface energy of drop of water of radius r is propotional to

The formation of mirage is due to

Masses 8, 2, 4, 2 kg are placed at the corners A, B, C, D respectively of a square ABCD of diagonal 80 cm. The distance of centre of mass from A will be

A particle is simultaneously acted upon by two forces, one of 3 N and the other of 4 N. The net force on the particle is

The excess pressure inside a spherical drop of radius 'r' of a liquid of surface tension 'T' is

The resistance of a cell does not depend on

A vessel is filled with an ideal gas at a pressure of 20 atm and is at a temperature of 27 ^oC . One half of the mass is removed from the vessel and the temperature of the remaining gas is increased to 87 ^oC . At this temperature the pressure of the gas will be ...