NEET Practice Test - 27 - NEET MCQ

Light enters at an angle of incidence in a transparent rod of refractive index n. For what value of the refractive index of the material of the rod the light once entered into it will not leave it through its lateral face whatsoever be the value of angle of incidence?

A car wheel is rotated to uniform angular acceleration about its axis. Initially its angular velocity is zero. It rotates through an angle θ₁ in the first 2s, in the next 2s, it rotates through an additional angle θ₂, the ratio of θ₂/θ₁ - is

The turn ratio in a step up transformer is 1:2. If a cell of 1.5 V is connected across the input, then the voltage across the output will be

A high altitude, a body explodes at rest into two equal fragments with one fragment receiving horizontal velocity of 10 m/s. Time taken by the two radius vectors connecting point of explosion of fragments to make 90° is

Consider two thin identical conducting wires covered with very thin insulating material. One of the wires is bent into a loop and produces magnetic field B₁, at its centre when a current I passes through it. The ratio B₁ : B₂ is:

A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity ω. Four objects each of mass m, are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be

When light of wavelength 300 nm (nanometre) falls on a photoelectric emitter, photoelectrons are emitted. For another emitter, however, light of 600 nm wavelength is sufficient for creating photoemission. What is the ratio of the work functions of the two emitters?

The mean radius of the earth is R, its angular speed on its own axis is ω and the acceleration due to gravity at earth's surface is g. What will be the radius of the orbit of a geostationary satellite?

The linear velocity of a rotating body is given by If   and , then the magnitude of is

Aerofoils are so designed that the speed of air

What is the work done in blowing a soap bubble of radius 0.2 m? (The surface tension of soap solution is 0.06 N/m)

An AC source is connected with a resistance R and an uncharged capacitance C in series. The potential difference across the resistor is in phase with the initial potential difference across the capacitor for the first time at the instant (assume that, at t = 0, emf is zero)

The molar specific heat at constant pressure of an ideal gas is (7/2) R. The ratio of specific heat at constant pressure to that at constant volume is

A small steell ball falls through a syrup at a constant speed of 1.0 m/s. If the steel ball is pulled upwards with a force equal to twice its effective weight, how fast will it move upward?

The correct statement of the law of equipartition of energy is

The fundamental frequency of a closed pipe is 220 Hz. If 1/4 of the pipe is filled with water, the frequency of the 1st overtone of the pipe now is

An electric dipole placed in a non-uniform electric field experiences

What is the total electric flux leaving a spherical surface of radius 1 cm and surrounding at electric dipole?

The transfer ratio β of a transistor is 50. The input resistance of the transistor when used in the common emitter configuration is 1 kΩ the peak value of the collector A.C. current for an A.C. input voltage of 0.01 V,is 

A current of 1.5 A flows through a copper voltmeter. The thickness of copper deposited on the electrode surface of area 50 cm² in 20 min will be (Density of copper = 9000 kgm^-3 and ECE of copper = 0.00033 g C^-1)

A body falls on the ground from a height of 10 m and rebounds to a height of 2.5 m. Then the ratio of velocities of the body just before and just after the collision will be

Two coils X and Y are placed in a circuit such that a current changes by 3 A in coil X and the magnetic flux changes of 1.2 Wb occurs in Y. The value of mutual inductance of the coils is

A point particle is held on the axis of a ring of mass m and radius r at a distance r from its centre C. When released, it reaches C under the gravitational attraction of the ring. Its speed at C will be

An electromagnetic wave going through vacuum is described by E = E₀sin(Kx - ωt).
Which of the following is independent of wavelength?

A piece of copper and another of germanium are cooled from room temperature to 80° K. The resistance of

In young's experiment, two coherent sources are 0.90 mm apart and fringes are observed at a distance of 1 m, if 2nd dark fringe is at 1 mm distance from central fringe, then wavelength of the monochromatic light will be

Current I_I in the following circuit is