## The number of solutions of sin The number of solutions of is

Anonymous User Maths 27 Jun, 2019 70 views

## Sound wave The ratio of speed of sound wave in neon to that in water vapours at any temperature is

Anonymous User Physics 24 Jun, 2019 72 views

The electron of hydrogen atom was excited from ground state to a higher orbit. During de-excitation of the electron, photons of six different wavelengths were emitted. If each photon forms a spectral line, how many spectral line will be visible to naked eye?

Anonymous User Chemistry 23 Jun, 2019 86 views

For the estimation of nitrogen, 1.4 g of an organic compound was digested by Kjeldahl method and the evolved ammonia was absorbed in 60 mL of M/10 sulphuric acid. The unreacted acid required 20 mL of M/10 sodium hydroxide for complete neutralization. The percentage of nitrogen in the compound is ?

Rahul Kumar Chemistry 21 Jun, 2019 297 views

When a rubber-band is stretched by a distance x, it exerts a restoring force of magnitude F = ax + bx*x where a and b are constants. The work done in stretching the unstretched rubber-band by L is ?

Anonymous User Physics 18 Jun, 2019 83 views

A parallel plate capacitor is made of two circular plates separated by a distance of 5 mm and with a dielectric of dielectric constant 2.2 between them. When the electric field in the dielectric is 10000 V/m, the charge density of the positive plate will be close to

Jitendra Mishra Physics 17 Jun, 2019 72 views

The pressure that has to be applied to the ends of a steel wire of length 10 cm to keep its length constant when its temperature is raised by 100°C is ?

(For steel Young’s modulus is (2 × 10^11) N/m^2 and coefficient of thermal expansion is 1.1 × 10^-5 K^-1)

Anonymous User Physics 17 Jun, 2019 66 views

A block of mass m is placed on a surface with a vertical cross section given by .

If the coefficient of friction is 0.5, the maximum height above the ground at which the block can be placed without slipping is ?

Anonymous User Physics 16 Jun, 2019 122 views

If 9th term of AP is 12 and 10the term is 18.what will be 18the term?

Preeti Rai Maths 11 Jun, 2019 76 views

## rotation The mi of a rod abt an axis through its axis and perpendicular to it is 1/12ml^2 the rod bent in middle so that 2 halves make angle 60 mi of bent rod abt same axis is

Anonymous User Physics 05 Jun, 2019 67 views

## rotation a square is made by joining 4 rods each of mass m and length its mi abt an axis pq in its plane and is passing through 1 of its end

Anonymous User Physics 05 Jun, 2019 78 views

A wheel of radius r rolls without slipping with a speed v on a horizontal road when it is at a pt a on road a small jump of mud separates from wheel at its highest point b and drops at c on road the dist ac [range] is

Anonymous User Physics 03 Jun, 2019 147 views

a block of mass 2 kg and specific gravity 5+2 is attached with springof spring constant=100n+mand is half dipped in water if extension is 1cm what is the force exerted by bottom of tank on block

Anonymous User Physics 30 May, 2019 397 views

A water drop of 0.05cm3 is squeezed between two glass plates and spreads into area of 40cm2. If the surface tension of water is
70 dyne/cm then the normal force required to separate the glass plates from each other will be

Anonymous User Physics 30 May, 2019 96 views

The equilibrium constant of the reaction CH3COOH (l)+C2H5OH (l)=CH3COOC2H5+H2O is 4.if one mole of each of acetic acid and ethyl alcohol are heated in presence of little concentrated H2SO4 at equilibrium the amount of ester present is

Anonymous User Chemistry 28 May, 2019 887 views

Let a, b, c and d be non−zero numbers. If the point of intersection of the lines 4ax + 2ay + c = 0 and 5bx + 2by + d = lies in the fourth quadrant and is equidistant from the two axes then?

Anonymous User Maths 25 May, 2019 95 views

## solid state an elemental crystal has a density of 8570kgm3 the packing efficiency is 0.68 if closest distance b/w neighbouring atom is 2.86 angstrom the mass of 1 atom

Anonymous User Chemistry 22 May, 2019 89 views

A bird is sitting on the top of a vertical pole 20 m high and its elevation from a point O on the ground is 45°. It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30°. Then the speed (in m/s) of the bird is?

Preeti Rai Maths 20 May, 2019 144 views

There is a circular tube in a vertical plane. Two liquids which do not mix and of densities d1 and d2 are filled in the tube. Each liquid subtends 90° angle at centre. Radius joining their interface makes an angle α with vertical. Ratio of d1/d2 Anonymous User Physics 20 May, 2019 221 views

A pipe of length 85 cm is closed from one end. Find the number of possible natural oscillations of air column in the pipe whose frequencies lie below 1250 Hz. The velocity of sound in air is 340 m/s?

Anonymous User Physics 19 May, 2019 118 views

the mass of a uniform ladder of length 5m is 20 kg a person of mass 60 kg stand on ladder stand at a height of 2m from bottom position of centre of mass of ladder and man from bottom is

Anonymous User Physics 19 May, 2019 426 views

From a tower of height H, a particle is thrown vertically upwards with a speed U. The time taken by the particle, to hit the ground, is n times that taken by it to reach the highest point of its path. The relation between H, u and n is ?

Anonymous User Physics 18 May, 2019 239 views

## The slope of the line touching both the parabolas y2 = 4x and x2 = −32y is? The slope of the line touching both the parabolas Anonymous User Maths 17 May, 2019 196 views

Let C be the circle with centre at (1, 1) and radius = 1. If T is the circle centred at (0, y), passing through origin and touching the circle C externally, then the radius of T is equal to ?

Anonymous User Maths 13 May, 2019 100 views

Let α and β be the roots of equation px2 + qx + r = 0, p ≠ 0. If p, q, r are in A.P. and 1/α +1/ β = 4, then the value of |α − β| is

Arpita Singh Maths 12 May, 2019 131 views

The radiation corresponding to 3 → 2 transition of hydrogen atom falls on a metal surface to produce photoelectrons. These electrons are made to enter a magnetic field of 3 × 10−4 T. If the radius of the largest circular path followed by these electrons is 10.0 mm, the work function of the metal is close to ?

Anonymous User Physics 12 May, 2019 101 views

A bird is sitting on the top of a vertical pole 20 m high and its elevation from a point O on the ground is 45°. It flies off horizontally straight away from the point O. After one second, the elevation of the bird from O is reduced to 30°. Then the speed (in m/s) of the bird is?

Anonymous User Physics 11 May, 2019 99 views

From a tower of height H, a particle is thrown vertically upwards with a speed U. The time taken by the particle, to hit the ground, is n times that taken by it to reach the highest point of its path.

Anonymous User Physics 10 May, 2019 70 views