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

Two identical light waves having phase difference 'Φ' propagate in same direction. When they superpose, the intensity of the resultant wave is proportional to ______.

A wire of length 'L' and area of cross-section · A' is made of material of Young's modulus 'Y'. It is stretched by an amount 'x'. The work done in stretching the wire is ______.

The magnetic dipole moment of a short magnetic dipole at a distant point along the equator of magnet has a magnitude of 'X' in SI units. If the distance between the point and the magnet is halved then the magnitude of dipole moment will be ______.

In Young's experiment for the interference of light, the separation between the silts is d and the distance of the screen from the slits is D. If D is increased by 0.6% and d is decreased by 0.2%, then for the light of a given wavelength, which one of the following is true?

"The fringe width  ____________."

In a Young's double-slit experiment, the intensity at a point where the path difference is `lambda/3` (`lambda` being the wavelength of the light used) is I. If I₀ denotes the maximum intensity, then `"I"/"I"_0` is equal to ______.

The velocity of sound waves in diatomic gas at 30° C ____________.

In Young's experiment, the distance between the slits is doubled and the distance between the slit and screen is reduced to half, then the fringe width ____________.

In a double slit experiment, the two slits are 2 mm apart and the screen is placed 1 m away. A monochromatic light of wavelength 500 nm is used. What will be the width of each slit for obtaining ten maxima of double slit within the central maxima of single slit pattern?

In a biprism experiment, D = 1 m, `lambda` = 6000 Å. When a convex lens is interposed between the biprism ru1d the eyepiece, then the distance between the images of the slits given by the Jens at two positions are 1.5 mm and 6.0 mm. The fringe width will be ______.

Magnetic dipole moment `vec"m"` of the coil, placed in uniform magnetic field of induction `vec"B"` does not depend on ____________.

Laplace's correction in the formula for the speed of sound given by Newton was required because sound waves ______.

A current loop in a magnetic field ____________.

The magnetic moment of a square coil having 10 turns, each side measuring 2 cm and carrying a current of unit ampere is ____________.

Assertion: The change in air pressure affects the speed of sound.

Reason: The speed of sound in gases is proportional to the square of pressure.

If universal gas constant is 8.3 joule/mole-Kand the Avogadro's number is 6 x 10²³, then mean kinetic energy of the oxygen molecules at 427 °C will be ______.

A thin mica sheet of thickness 4 x 10^-6 m and refractive index 1.5 is introduced in the path of the first wave. The wavelength of the wave used is 5000 A. The central bright maximum will shift ______.

In a Young's experiment, two coherent sources are placed 0.60 mm apart and the fringes are observed one metre away. If it produces the second dark fringe at a distance of 1 mm from the central fringe, the wavelength of monochromatic light used would be ____________.

A circular coil having N turns and radius r carries a current I. It is held in the XZ plane in a magnetic field B `hat"i".` The torque on the coil due to the magnetic field is: ____________.

In Young's double-slit experiment, an interference pattern is obtained on a screen by a light of wavelength 4000 Å, coming from the coherent sources S₁ and S₂ At certain point P on the screen, third dark fringe is formed. Then the path difference S₁P - S₂P in microns is ______.

In Young's double slit experiment with a source of light of wavelength 5860 Å, the first maxima will occur when ____________.