MAH-MHT CET (PCM/PCB) entrance exam Question Bank Solutions for Physics

Which of the following is TRUE?

Two sources of light 0.5 mm apart are placed at a distance of 2.4 m and wavelength of light is 5000 Å. The phase difference between the two light waves interfering on the screen at a point at a distance 3 mm from central bright band is ____________.

If the radius of the circular path and frequency of revolution of a particle of mass m are doubled, then the change in its kinetic energy will be (E_i and E_f are the initial and final kinetic energies of the particle respectively.)

The magnetic field energy in an inductor changes from maximum value to minimum value in 10 ms, when connected to an a.c. source. The frequency of the source is ______.

If wavelength for a wave is `lambda = 6000  Å,` then wave number will be ____________.

A particle of charge q, mass m and energy E has de-Broglie wavelength `lambda.` For a particle of charge 2q, mass 2m and energy 2E, the de-Broglie wavelength is ____________.

A horizontal circular platform of mass 100 kg is rotating at 5 r.p.m. about vertical axis passing through its centre. A child of mass 20 kg is standing on the edge of platform. If the child comes to the centre of platform then the frequency of rotation will become ______.

In interference experiment, intensity at a point is `(1/4)^"th"` of the maximum intensity. The angular position of this point is at (sin30° = cos60° = 0.5, `lambda` = wavelength of light, d = slit width) ____________.

A pendulum has length of 0.4 m and maximum speed 4 m/s. When the length makes an angle 30° with the horizontal, its speed will be ______.
`[sin  pi/6 = cos  pi/3 = 0.5 and "g" = 10 "m"//"s"^2]`

In an oscillating LC circuit, the maximum charge on the capacitor is Q. The charge on the capacitor, when the energy is stored equally between the electric and magnetic field is ____________.

A car moves at a speed of 36 km hr^-1 on a level road. The coefficient of friction between the tyres and the road is 0.8. The car negotiates a curve of radius R. If g = 10 ms^-2 , then the car will skid (or slip) while negotiating the curve, if the value of R is ____________.

In a biprism experiment, red light of wavelength 6500 Å was used. It was then replaced by green light of wavelength 5200 Å. The value of n for which (n + 1)^th green bright band would coincide with n^th red bright band for the same setting is ______.

Two coherent light sources of intensity ratio 'n' are employed in an interference experiment. The ratio of the intensities of the maxima and minima in the interference pattern is (I₁ > I₂).

In biprism experiment, the 4^th dark band is formed opposite to one of the slits. The wavelength of light used is ______.

How much energy is imparted to an electron so that its de-Broglie wavelength reduces from 10^-10 m to 0.5 × 10^-10 m? (E =energy of electron)

Let the series limit for Balmer series be 'λ₁' and the longest wavelength for Brackett series be 'λ₂'. Then λ₁ and λ₂ are related as ______.

The mass of a body on the surface of the earth is 10 kg. The mass of the same body on the surface on the moon is `"g"_"m" = 1/6 "g"_"e"`, where g_m, g_e acceleration due to gravity on the surface of the moon and the earth respectively.

If the two slits in Young's double slit experiment have width ratio 9 : 1, the ratio of maximum to minimum intensity in the interference pattern is ______.

A particle of mass 'm' having charge 'q' is held at rest in uniform electric field of intensity 'E'. When it is released, the kinetic energy attained by it after covering a distance 'y' will be ______.

In the Young's double slit experiment, if the phase difference between the two waves interfering at a point is `phi`, the intensity at that point is proportional to ____________.