jee-2018 Question Bank - Sarthaks eConnect

If `y=A sin (omegat-kx)` is the equation of sound as displacement wave travelling along x-axis in a medium. If B is bulk modulus of elasticity of medium then sound as a pressure wave is given by

Certain amount of an ideal diatomic undergoes a thermodynamic process from state A to B as shown on p-v diagram change in internal energy of gas is

Certain amount of an diatomic gas undergoes a cyclic process shown on p-v diagram efficiency of cycle is

Two containers having equal volume contain molecular hydrogen at 1 atm pressure and helium at 2 atm pressure respectively. The ratio of root mean square speed of hydrogen molecule to that of helium molecule, if both the samples are at same temperature, is

A certain amount of an ideal diatomic gas undergoes a thermodynamic process in which pressure p of gas and absolute temperature T of gas are related `P^3propT^4`then molar specific heat of gas during the process is (R=universal gas constant)

A glass prism of refractive index 1.5 is Immersed in water (refractive index `4/3`). A lights beam incident normally on the face AB totally reflected to reach the face BC if

A ray of light from a denser medium strikes a rarer at an angle of incidence I (see figure). The reflected and refracted rays make an angle of `90^o` with each other. The angles of reflection and refraction are r and r’. The critical angle is

A narrow, slit of width 1 mm is illuminated by monochromatic light of wavelength 600 nm. The distance between the first minima on either side of a screen at a distance of 2 m is

An isosceles prism of angle `120^o` has refractive index 1.44. Two parallel rays of monochromatic light enter the prism parallel to each other in air as shown. The rays emerging from the opposite face

A lens of glass, refractive index 1.5 has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75,it will behave as a

Two coherent monochromatic light beams of intensities I and 4I are superposed. The maximum and minimum possible intensities in the resulting beam are

A concave lens of focal length 40 cm is in contact with a concave lens of focal length 25 cm. The power of the combination is

A short linear object of length b lies along the axis of a concave mirror of local f at a distance u from the pole of the mirror. The size of the image is approximately equal to

A spherical surface of radius of curvature R, separates air (refractive index 1.0) from glass (refractive index 1.5). The centre of curvature is in the glass. A point object P placed in air is found to have a real image Q in the glass. The line PQ cuts the surface at a point O and PO =OQ. The distance PO is equal to

A thin slice is cut of a glass cylinder along a plane parallel to its axis. The slice is placed on a flat plate as shown. The observed interference fringes from this combination shall be

A diverging beam of light from a point source S having divergence angle `alpha` falls symmetrically on a glass slab as shown. The angles of incidence of the two example rays are equal. If the thickness of the glass slab is its t and its refractive index is n, then divergence angle of the emergent beam is

A point source of light S, placed at a distance I, in front of the centre of a plane mirror of width d, hangs vertically on a wall. A man walks in front of the mirror along a line parallel to the mirror at a distance 2I, from it as shown. The greatest distance over which he can see the image of the light source in the mirror is

In a double slit experiment instead of taking slits of equal width, one slit is made twice as wide as the other, then in the interference pattern

Two beams of light having intensities I and 4I interfere to produce a fringe pattern on a screen. The phase different between the beam is `pi/2` at point A and `pi` at point B. Then the difference between resultant intensities at A and B is

In a Young’s double slit experiment, 12 fringes are observed to be formed in a certain segment of the screen when light of wavelength 600 nm is used. If the wavelength of light is changed to 400 nm, number of fringes observed in the same segment of the screen is given by

Recent questions and answers in jee-2018