If then xy+1=

A wire of length 2 m is made from 10 cm³ of copper. A force F is applied so that its length increases by 2 mm. Another wire of length 8 m is made from the same volume of copper. If the force F is applied to it, its length will increase by….

The absolute value (or modulus) | x | of a real number x is the non-negative value of x without regard to its sign.

The velocity of a train which starts from rest is given by

The time being recorded in minutes from the start and the speed in kmph. Find approximately the total distance run in 20 minutes by simpson’s rule is

A river is 40 metre wide. The depth d in metres at a distance x metres from a bank is given in the following table. Using simpson's rule, estimate the area of cross section of the river in square metres is

The refractive index of the material of the prism and liquid are 1.56 and 1.32 respectively. What will be the value of for the following refraction

An isosceles prism of angle 120° has a refractive index of 1.44. Two parallel monochromatic rays enter the prism parallel to each other in air as shown. The rays emerging from the opposite faces

If the interatomic spacing in a steel wire is   the force constant =…..

In the figure rectangle ABCD, what is the probability that a randomly chosen point that in ABCD lies inside the triangle ABE is 

Which one of the following spherical lenses does not exhibit dispersion? The radii of curvature of the surfaces of the lenses are as given in the diagrams

Shown in the figure here is a convergent lens placed inside a cell filled with a liquid. The lens has focal length + 20 cm when in air and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is

A glass prism = 1.5) is dipped in water = 4/3) as shown in figure. A light ray is incident normally on the surface AB. It reaches the surface BC after totally reflected, if

A ray of light is incident at the glass–water interface at an angle i, it emerges finally parallel to the surface of water, then the value of would be

The PV diagram shows four different possible paths of a reversible processes performed on a monoatomic ideal gas Path A is isobaric, path B is isothermal, path C is adiabatic and path D is isochoric For which process does the temperature of the gas decrease?