NEET Mock Test - 28 - NEET MCQ

Which of the following is discovered from the discharge tube experiment?

Two photons of energies twice and thrice the work function of a.metal are incident On the metal surface. Then the ratio of maximum velocities of the photoelectrons emitted in the two cases respectively is

A plumb line is suspended from a ceiling of a ear moving with horizontal acceleration of a. What will be the angle of inclination with vertical?

The internal resistance of a cell of e.m.f. 2 V is 0.1 Ω. It is connected to a resistance of 3.9 Ω. The voltage across the cell will be

A particle of mass m at rest decays into two masses m₁ and m₂ with non-zero velocities. The ratio of de-Broglie wavelengths of the masses λ₁/λ₂ is

In Millikan's experiment, an oil drop having charge q gets stationary on applying a potential differnce V in between two plates separated by a distance 'd'. The weight of the drop is

When a proton is accelerated through 1 V, then its kinetic energy will be

The work function of aluminium 4.2 eV. If two protons, each of energy 3.5 eV strike and electron of aluminimum, then emission of electrons will be

A small coil of radius r is placed at the centre of a large coil of radius h (where R >> r). The two coils are coplanar. The mutual inductance between the coil is proportional to

Which scientist experimentally proved the existance of electromagnetic waves?

In T.V. broadcasting both picture and sound are transmitted simultaneously. In this

A dust particle of mass 10⁻³ gm is stationary between the plates of a horizontal parallel plate capacitor of 0.016m separation which is connected to a voltage of 100V. How many fundamental charges (e = 1.6 x 10 ^{− 19} C) the dust particle carries

Two spherical conductors A and B having equal radii and carrying equal charges on them, repel each other with a force F, when kept apart at some distance. A third spherical conductor C having same radius as that of A, but uncharged, is brought in contact with A, then brought in contact with B and finally removed away from both. The new force of repulsion between the conductors A and B is

Two bodies of equal mass m go around a circular path of radius R under the action of their mutual gravitional attraction, in such a way that they remain opposite to each other. The speed of each body is

On a cold morning, a metal surface will feel colder to touch than a wooden surface because

A spring balance is attached to the ceiling of a lift. A man hangs his bag on the spring and the balance reads 49 N when the lift is stationary. If the lift moves downwards with an acceleration of 5 m/s², the reading of the spring balance would be

At a given temperature, the pressure of an ideal gas of density ρ is proportional to

The magnetic dipole moment of a current loop is independent of

A bar magnet is equivalent to a current-carrying

At the neutral point, horizontal component of the magnetic field due to a magnet is

How much force is required to produce an elongation of 0.2% in the length of a brass wire of diameter 0.6 mm? (Take Young's modulus for brass = 0.9x10¹¹ N-m⁻²)

If in a nuclear reactor using U²³⁵ as fuel, the power output is 4.8 mega watts, the number of fissions per second is:
(energy released per fission of U²³⁵ = 200 MeV; 1eV = 1.6 x 10⁻¹⁹ J)

Two spheres of equal masses but radii r₁ and r₂ are allowed to fall in a liquid of infinite column. The ratio of their terminal velocities are

The difference between the mass of a nucleus and the total mass of the constituents is its

α- particle is equivalent to

Two points are located at a distance of 10 m and 15 m from the source of oscillation . The period of oscillation is 0.05 sec and the velocity of the wave is 300 m/sec. What is the phase difference between the oscillations of two points ?

A ray of light passes through an equilateral prism such that the angle of incidence is equal to the angle of emergence and the latter is equal to 3/4 the angle of prism. The angle of deviation is