AIIMS Full Mock Test 4 - NEET MCQ

A particle falls from a height 'h' upon a fixed horizontal plane and rebounds. If 'e' is the coefficient of restitution, the total distance travelled before rebounding has stopped is

Potentiometer measures potential more accurately because

An electron is moving with constant velocity along x-axis. If a uniform electric field is applied along y-axis, then its path in the x-y plane will be

Light of frequency 4v₀ is incident on the metal of the threshold frequency v₀. The maximum kinetic energy of the emitted photoelectrons is

Cathode rays can be deflected by

Uncertainty in position of the electron is of the order of de-Broglie wavelength. Making use of Heisenberg's uncertainty principle, it will be found that uncertainty in velocity ν is of the order of

A circular ring of area of 0.5 m² is situated in a non-uniform magnetic field of 4T changing in 2s and making an angle of 60º with the magnetic field. The magnitude of the induced e.m.f. will be

What is increased in a step-down transformer

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

A coil of inductances 300mH and resistance 2 Ω is connected to a source of voltage 2V. The current reaches half of its steady state value in

A 10 μF capacitor is charged to a potential difference 50 V and it is then connected to another uncharged capacitor in parallel. If common potential difference becomes 20 V, then capacitance of the second capacitor is

The displacement current arises when electric field in a region

A light and a heavy body have equal momentum Which one has greater Kinetic Energy?

If electric flux entering and leaving an enclosed surface is φ₁ and φ₂ respectively, the electric charge inside the enclosed surface will be

A body of mass 2 kg is projected vertically upwards with a velocity of 2 m sec⁻¹. The K.E. of the body just before striking the ground is

The original temperature of a black body is 727ºC. The temperature at which this black body must be raised so as to double the total radiant energy, is

A 4μ F conductor is charged to 400 volts and then its plates are joined through a resistance of 1 k Ω. The heat produced in the resistance is

Curie temperature of iron is the temperature below which it is

A bar magnet is held perpendicular to a uniform field. If the couple acting on the magnet is to be halved by rotating from above position, the angle by which it is to be rotated is

The extension in a string, obeying the Hooke's law, is x. The speed of sound in the stretched string is v. If the string is extended to 1.5 x, then speed of sound will be

A cold soft drink is kept on the balance. When the cap is open, then the weight

The half-life period of a radioactive element is 140 days. After 560 days, one gram of the element will reduce to

Two simple harmonic motions with the same frequency act on a particle at right angles i.e., along x and y-axis. If the two amplitudes are equal and the phase difference is π/2, the resultant motion will be

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A):If we heat a substance, then its mass increases.
Reason(R):Heat-energy is given to the mass.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): Sum of the mass moment is zero, if centre of mass is at origin.
Reason(R): Position of centre of mass is given by

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A parallel plate capacitor is connected across battery through a key. A dielectric slab of constant K is introduced between the plates. The energy stored becomes K times.
Reason(R): The surface density of charge on the plates remains constant or unchanged.

In the following question, a Statement of Assertion (A) is given followed by a corresponding Reason (R) just below it. Read the Statements carefully and mark the correct answer-
Assertion(A): A current carrying wire produces electric field.
Reason(R): The current in a wire is due to the flow of free electrons in a definite direction.