NEET Mock Test - 14 - NEET MCQ

In the photo electric phenomenon, the number of photo electrons emitted is proportional to

A boy on a cycle pedals around a circle of 20 mts radius at a speed of 20 m/s. The combined mass of the boy and the cycle is 90 kg. The angle that the cycle makes with the vertical so that it may not fall is (g = 9.8 m/sec²)

A potentiometer consists of a wire of length 4 m and resistance 10 Ω. It is connected to a cell of e.m.f. 2V. The potential difference per unit length of the wire will be

A milliammeter of range 10 mA has a coil of resistance 1 Ω. To use it as voltmeter of range 10 volt, the resistance that must be connected in series with it, will be

Photons of energy 6eV are incident on a metal surface whose work function is 4eV. The minimum kinetic energy of the emitted photoelectrons will be

Light of frequency v is incident on a certain photoelectric substance with threshold frequency v₀. The work function for the substance is

In an electron gun, the electrons are accelerated by the potential V. If e is the charge and m is the mass of an electron, then the maximum velocity of these electrons will be

The de-Broglie wavelength of a neutron when its kinetic energy is K is λ. What will be its wavelength when its kinetic energy is 4 K ?

Transformers are used in

Maxwell in his famous equation of electromagnetism introduced the concept of

Heat radiations propagate with the speed of

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

Two spherical conductors of radii 4 cm and 5 cm are charged to the same potential. If σ₁ and σ₂ be the respective values of the surface density of charge on both the conductors, then the ratio σ₁/σ₂ is

Two spheres of masses m and M are situated in air and the gravitational force between them is F. The space around the masses is now filled with a liquid of specific gravity 3. The gravitational force will now be

If a metallic sphere gets cooled from 62°C to 50°C in 10 minutes and in the next 10 minutes gets cooled to 42°C, then the temperature of the surroundings is

Absolute temperature can be calculated by

Consider two unequal masses m₂ > m₁ connected by a string which passes over a frictionless and massless pulley. The tension T in string is

A current passing through a circular coil of two turns produces a magnetic field B at its centre. The coil is then rewound so as to have four turns and the same current is passed through it. The magnetic field at its centre now is

When 2 A current is passed through the coil of a tangent galvanometer, it gives a deflection of 45°. For 60° deflection, the current must be

Magnetic moment of a magnet is M. Maximum value of torque acting on this magnet when suspended in a uniform magnetic field of intensity B is

The potential energy of a molecule increases when it is brought to the surface from the interior of a liquid because

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 nucleus finally formed in fusion of protons in proton-proton cycle is

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:

In the following reaction, the energy released is

When the bob of a simple pendulum, held in hand is subjected to and fro motion at hill, then the oscillations of the bob will be

When red glass is heated in dark room, it will seem