NEET (UG) entrance exam Question Bank Solutions

Two spherical conductors A and B of radii a and b(b > a) are placed concentrically in the air. B is given a charge +Q and A is earthed. The equivalent capacitance of the system is ______.

The radius of a sphere of capacity 1 microfarad in the air is ______

A steady current of 1 A is flowing through the conductor. The number of electrons flowing through the cross-section of the conductor in 1 second is ______

The magnetic flux linked with a coil in Wb is given by the equation Φ = 3t² + 4t + 9. Then the magnitude of induced emf at t = 2 sec will be ______.

A planet revolves in an elliptical orbit around the sun. The semi-major and minor axes are a and b, then the time period is given by:

A rod has a radius of 100 mm and a length of 10 cm. A 100 N force compress along its length. Calculate the longitudinal stress developed in the rod.

A simple harmonic motion is given by, x = 2.4 sin ( 4πt). If distances are expressed in cm and time in seconds, the amplitude and frequency of S.H.M. are respectively, 

A point source of light S is placed in front of two large mirrors as shown. Which of the following observers will see only one image of S?

Huygen's conception of secondary waves ______.

A parallel beam of monochromatic light of wavelength 5000 Å is incident normally on a single narrow slit of width 0.001 mm. The light is focused by a convex lens on a screen placed on the focal plane. The first minima will be formed for the angle of diffraction equal to ______.

The dimensions of magnetic flux are ______

The unit of magnetic flux in SI is ______

When a Van der Waal's gas undergoes free expansion, then its temperature ______.

Which of the following is the unit of displacement current?

A body oscillates with SHM according to the equation x = 5 cos `(2π"t" + π/4)`. Its instantaneous displacement at t = 1 sec is:

Between the plates of parallel plate condenser there is 1 mm thick medium shoot of dielectric constant 4. It is charged at 100 volt. The electric field in volt/meter between the plates of capacitor is ______.

Two similar conducting spheres having charge+ q and -q are placed at 'd' seperation from each other in air. The radius of each ball is r and the separation between their centre is d (d >> r). Calculate the capacitance of the two ball system ______.

The dimensional formula of magnetic flux is ______.

A parallel plate capacitor of plate separation 2 mm is connected in an electric circuit having source voltage 400 V. What is the value of the displacement current for 10^-6 second if the plate area is 60 cm²?

According to Maxwell's hypothesis, a changing electric field gives rise to ______.