NEET Physics Daily MCQs Practice Questions | 7 August, 2024

Assertion: Light emitting diode (LED) emits spontaneous radiation
Reason: LED are reverse biased p-n junctions

Statement I : In a reverse biased p-n junction diode, the current measured in (µA) , Which is due to minority charge carriers. 
Statement II: In a forward biased p-n- Junction diode, the current measured in (mA), which is due to minority charge carriers.

Magnetic field due to 0.2 A current flowing through circular coil of radius 0.1m having 2000 turns at the centre of the coil:

The block of mass M moving on the frictionless horizontal surface collides with the spring of spring constant k and compresses it by length L. The maximum velocity of the block after collision is:

 Assertion: The temperature at which Centigrade and Fahrenheit thermometers read the same is –60°.
Reason: There is no relation between Fahrenheit and Centigrade temperature.

The moment of inertia of a thin uniform rod rotating about the perpendicular axis passing through one end is I. The same rod is bent into a ring and its moment of inertia about the diameter is I', then the ratio $\frac{{\mathrm{I}}^{\text{'}}}{\mathrm{I}}$ is:

At what temperature the r.m.s velocity of a hydrogen molecule is equal to that of an oxygen molecule at 27°C:

A simple pendulum executing S.H.M. about x = 0 with period T and amplitude A. Its speed when at a distance $\frac{\mathrm{A}}{3}$ from its mean position:

Two particle of masses m and 9m are placed at a distance r. The gravitational potential at a point on the line joining them where the gravitational field is zero is:

 In a thermodynamic process, pressure of a fixed mass of an ideal gas is changed in such a manner that the gas molecules gives out 20 J of heat and 8 J of work is done on the gas. If the initial internal energy of the gas was 30 J. then the final internal energy will be:

A charged particle is balanced in an electric field E. If direction of field is reversed then find net force on particle :

A point electric dipole $\vec{p} = -p_0 \hat{x}$ is kept at the origin. The potential and electric field due to this dipole on the y-axis at a distance $d$ are respectively: (Take $V = 0$ at infinity)​

In the following figure, electric flux passing through the surface is :

A stationary wave is represented by Y = A sin(100t) cos(0.01x), where y and A are in
millimeters, t is in seconds, and x is in meteres, the velocity of super imposing waves is:

 In the figure shown below, the charge on the left plate of the 10µF capacitor is –30µC. The charge on the right plate of the 6µF capacitor is: