SRMJEE Mock Test (Med) - 13 - JEE MCQ

A particle of mass m is suspended from a fixed point C by a light string of length a. The particle is projected at right angle to the string with a velocity with which it describes a complete circle is—

The wire in electrical industry are made of copper, because it is/has

Threshold wavelength for photoelectric emission from a metal surface is 5200 Å. Photoelectrons will be emitted when this surface is illuminated with monochromatic radiation from

The extension of a wire by the application of load is 3 mm. The extension in a wire of the same material and length but half the radius by the same load is

If a solid state power supply having voltage regulation 25% has full load voltage of 20V, what will be its no-load voltage?

A body from height h is dropped. If the coefficient of restitution is e, then calculate the height achieved after one bounce.

A body of 2 gm carrying a charge of 0.1 μ C starts from rest at the positive plate and moves to the negative plate of a parallel plate condenser connected to a voltage supply of 30KV. The final velocity is

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

For a gas the difference between the two specific heats is 4150 J/kg K. What is the specific heats at constant volume of gas it the ratio of specific heat is 1.4

A person is sitting in a travelling train and facing engine. He tosses up a coin and coin falls behind him. It can be concluded that train is

A moving positively charged particle, enters a region of uniform magnetic field directed vertically upwards. This particle will move

A bar magnet having a magnetic moment of 2 x 10⁴ J T^-1 is free to rotate in a horizontal plane. A horizontal magnetic field B = 6 x 10⁴ T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60^o from the field is:

R and r are the radii of the earth and moon respectively. ρ_e and ρ_m are the densities of earth and moon respectively. The ratio of the accelerations due to gravity on the surfaces of earth to moon is

A body takes T minutes to cool from 62^oC to 61^oC when the surrounding temperature is 30^oC . The time taken by the body to cool from 46^oC to 45.5^oC is

The application of Bernoulli theorem can be seen in

A ball is dropped on the floor from a height of 10 m. It rebounds to a height of 2.5 m. If the ball is in contact with the floor for 0.01 sec, the average acceleration during contact is

A 500 kg car takes a round turn of radius 50 m with a velocity of 36 km−h^-1. The centrifugal force acting on the car is

A rope of length L is pulled by a constant force F. What is the tension in the rope at a distance x from the end where the force is applied

To make the frequency double of an oscillator, we have to

A particle of mass m is projected with the velocity ν making an angle of 45^o with the horizontal. The magnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)

The force F on a sphere of radius 'a' moving in a medium with velocity 'ν' is given by F = 6 π η a ν. The dimension of η are

The image formed by an objective of a compound microscope is

A 2 kg mass is rotating on a circular path of radius 0.8 m with angular velocity of 44 rad-s^-1 If radius of the path becomes 1 m, then value of angular velocity will be

Following sets of three forces act on a body. In which case the resultant cannot be zero?

Small droplets of a liquid are usually more spherical in shape than larger drops of the same liquid because

A cell of constant electromotive force (E) produces an equal amount of heat during the same time in two independent resistances R₁ and R₂, when connected separately one after the other across the cell. The internal resistance (r) of the cell is

A heat engine is a device