NEET Mock Test - 31 - NEET MCQ

Given three equal resistors, how many different combination of all the three resistors can be made?

An electron remains undeflected when passing perpendicular to mutually perpendicular electric and magnetic fields. If the magnetic field is 8 Gauss and elecric field is 4000 V/m, the velocity of the electron is

A positron and a proton are accelerated by the same accelerating potential. Then the ratio of the associated wavelengths of positron and proton will be [M = mass of proton; m = mass of positron]

A wire of length 100 cm is connected to a cell of emf 2 V and negligible internal resistance. The resistance of the wire is 3 Ω. The additional resistance required to produce a pot. diff. Of 1 millivolt per cm is

In photoelectric effect if the intensity of light is doubled then maximum kinetic energy of photoelectrons will become

The slope of a graph between frequency of light (v) and stopping potential (V₀) is (where h = Planck's constant and c = Charge on an electron)

Which of the following electromagnetic waves has minimum frequency ?

A photocell stops emission if it is maintained at 2V negative potential. The energy of most energetic photoelectron is

A coil of wire of radius r has 600 turns and a self inductance of 108 mH. The self inductance of a similar coil of 500 turns will be

The range of wavelength of visible light is

Which of the following rays has minimum frequency?

A straight wire of length l and electric dipole moment p is bent to from a semicircle. The new electric dipole moment would be

There is 10 units of charge at the centre of a circle of radius 10m. The work done in moving 1 unit of charge around the circle once is

A body is projected vertically upwards from the surface of a planet of radius R with a velocity equal to half the escape velocity for that planet. The maximum height attained by the body is

Two identical conducting rods are first connected independently to two vessels, one containing water at 100°C and the other containing ice at 0°C. In the second case, the rods are joined end to end and connected to the same vessels. Let Q₁ and Q₂ be the rates of melting of ice in the two cases respectively. The ratio Q₁/Q₂ is

If two moles of diatomic gas and one mole of mono atomic gas are mixed then the ratio of specific heats is

A cyclist moving with a speed of 4.9 m−s⁻¹ on a level road can take a sharp circular turn. The coefficient of friction between the cycle tyres and road is 0.5, then radius of the turn is

A galvanometer of resistance 98 Ω is shunted by a resistance of 2 Ω . The fraction of total current that passes through the galvanometer is

The material suitable for making electromagnets should have

A magnet is placed with its north pole facing north in north-south direction. In its map of magnetic field the null points will be

Two pieces of a glass plate, placed one upon the other with a little water in between them, can not be separated easily, because of

Two wires of the same material and length, but diameters in the ratio 1 : 2 are stretched by the same force. The elastic potential energy stored per unit volume for the two wires when stretched, will be in the ratio of

The phenomena in which proton flips is

The nucleus of ₅₆Ba¹⁴¹ contains ---- neutrons

The radio - isotope of this element is used in the treatment of cancer

If a body is released into a tunned dug along the diameter of the earth of radius R₀, it executes the S.H.M. with time period:

The nature of sun's spectrum is