AIIMS Full Mock Test - 7 - NEET MCQ

The resistance of a discharge tube is

In Millikan oil drop experiment a drop of charge Q and radius r is kept constant between two plates of potential difference of 800 volt. Then charge on other drop of radius 2 r which is kept constant with a potential difference of 3200 V is

An electron and a proton have the same de-Broglie wavelength. Then the kinetic energy of the electron is

Consider the following statements concerning electrons :
(I) Electrons are universal constitutents of matter
(II) J.J. Thomson received the very first Nobel Prize in Physics for discovering the electron
(III) The mass of the electron is about 1/2000 of that of a neutron
(IV) According to Bohr the linear momentum of the electron is quantised in the hydrogen atom.

Which of the above statements are NOT correct ?

The given graph shows the variation of charge q versus potential difference for two capacitors C₁ and C₂. The two capacitors have same plate separation, but the plate area of C₂ is double that of C₁.

The working of a dynamo is based on principle of

In purely inductive circuit, the relation of phase between current and voltage 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

An e.m.f. of 15 V is applied in a circuit coil containing 5 henry inductance and 10 ohm resistance. The ratio of currents at time t = ∞ and t = 1 second is

The waves which can not travel in vacuum are

Two electric charges of 9μC and − C are placed 0.16 m apart in air. There will be a point P at which electric potential is zero on the line joining the two charges and in between them. The distance of P from 9μC charge is

In Thomson's method of determing e/m of electrons

A unit charge is taken from one point to another over an equipotential surface. The work done in this process will be

Two masses of 1 gm and 4 gm are moving with equal kinetic energies. The ratio of the magnitudes of their linear momentum is

A light and a heavy body have equal kinetic energy. Which one has a greater momentum ?

The lengths and radii of two rods made of same material are in the ratios 1:2 and 2:3 respectively. If the temperature difference between the ends for the two rods be the same, then in the steady state, the amount of heat flowing per second through them will be in the ratio

An electric bulb marked 40 W and 200 V, is used in a circuit of supply voltage 100 V. Now its power is

The direction of magnetic line of force of a bar magnet is

The domain formation is a necessary feature of

Two wires of same radius and length are subjected to the same load. One wire is of steel and the other is of copper. If Young's modulus of steel is twice that of copper, then ratio of elastic potential energies stored per unit volume in steel wire to that in copper wire is

The half-life of a radioactive isotope is three hours. If the initial mass of the isotope were 256 g,the mass of it remaining undecayed after 18 hours would be

A rectangular block of mass m and area of cross-section A floats in a liquid of density ρ. If it is given a small vertical displacement from equilibrium it undergoes oscillation with a time period T. Then

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): Threshold wavelength of certain metal λ₀. Light of wavelength is slightly less than λ₀ is incident on the plate. It is found that after some time the emission of electron stops
Reason(R): The ejected electrons experience force of attraction due to development of positive charges on the plate, which after certain time is adequate enough to hold them to plate itself.

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): When sunlight is focused on the slit, of a spectrometer, many dark lines are seen in the region of continuous spectrum .
Reason (R): A substance absorbs light of the same wavelength which it emits.

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 the distance between the parallel plates of a capacitor is halved and dielectric constant is made three times, then capacitance becomes six times.
Reason(R): Capacitance of the capacitor does not depend on the geometry of the plates of the capacitor.

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): Neutrons can be accelerated by cyclotron.
Reason(R): Neutrons are too heavy.

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): Soft iron core is placed within the moving coild galvanometer .
Reason(R): Soft iron has low permeability .