NEET Mock Test - 27 - NEET MCQ

An electron and a proton have same de-Broglie's wavelength. The kinetic energy of an electron is

The angular speed of an engine wheel making 90 revolutions per minute is

Three resistances of one ohm each are connected in parallel. Such connection is again connected with 2/3Ω resistor in series. The resultant resistance will be

A cell of internal resistance 1.5Ω and of e.m.f. 1.5 volt balances 500 cm on a potentiometer wire. If a wire of 1.5 Ω is connected between the balance point and the cell, then the balance point will shift

Light of wavelength 5000 Å is incident on a metal, whose work-function is 2 eV. The maximum kinetic energy of the photoelectrons would be

The maximum wavelength of a beam of light can be used to produce photo electric effect on a metal is 250 nm. The energy of the electrons in Joule emitted from the surface of the metal when a beam of light of wavelength 200 nm is used [h = 6.6 x 10 ^{− 34} J − sec ; c = 3 x 10 ⁸ ms ^{− 1} ]

If particles are moving with same velocity, then maximum de-Broglie wavelength will be for

The energy of a photon of wavelength λ is given

A coil of n turns and resistance R is connected with a galvanometer of resistance 4 R.. This combination is moved in time t seconds from a magentic flux φ₁ to φ₂. The induced current in the circuit is

Which one of the following electromagnetic radiations have the smallest wavelength?

Infra-red radiations are detected by

Sixty four identical drops each charged by q coulomb to potential V volt coalesce to form a single large drop. The charge and potential on the large drop are respectively

An electric dipole has the magnitude of its charge as q, and its dipole moment is p. It is placed in a uniform electric field E. If its dipole moment is along the direction of the field, then force acting on it and its potential energy are respectively

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

If a piston is pushed rapidly into a container of gas, what will happen to the kinetic energy of the molecules of gas and to the temperature of the gas

In a closed room, heat transfer takes place by

A mass m falls freely from rest. The linear momentum, after it has fallen through height h, is

A magnet freely suspended in a vibration magnetometer makes 40 oscillations per minute at a place 'A' and 20 oscillations per minute at a place 'B'. If the horizontal component of earth's magnetic field at 'A' is 36 x 10 ^{− 6} T, then its value at 'B' is

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)

Air is streaming over both the aeroplane wings such that its speed is 85 m-s⁻¹ over the upper surface and 75 m-s⁻¹ at the lower surface. If the wings are 10 m long and have an average width of 2 m, then lift of the wind on aeroplane is (Take density of air = 1.5 kg-m⁻¹)

The magnetic field strength at a point at a distance 'd' from the centre, on the axial line of a very short bar magnet of magnetic moment 'M' is B. The magnetic induction at a distance'2d' from centre on the equatorial line of a magnet of moment 8M, will be

A wire of length L and cross-section A is made of material of Young's modulus Y. If it is stretched by an amount x, then work done is

When the nucleus of a radioactive element emits an alpha particle, the atomic number is decreases by

During the β -decay,

In a Rutherford scattering experiment when a projectile of charge z₁ and mass M₁ approaches a target nucleus of charge z₂ and mass M₂, the distance of closest approach is r₀. The energy of the projectile is:

A convex lens has a focal length f. It is cut into two parts along a line perpendicular to principal axis. The focal length of each part will be

If the moment of inertia of a wheel, having radius of gyration 60 cm, is 360 kg-m², then mass of the wheel is