If `0^circ``<``A``<``90^circ` and `(sin x+cos x)/cos^3 x` =`atan^3 x+btan^2 x+ctan x+d`,then `a+2b+3c+4d=`

In an experiment for determination of refractive index of glass of a prism by i-delta , plot it was found thata ray incident at angle 35^circ , suffers a deviation of 40^circ and that it emerges at angle 79^circ . In that case which of the following is closest to the maximum possible value of the refractive index?

A ladder is resting with the wall at an angle of 30^circ . A man is ascending the ladder at the rate of 3 ft/sec. His rate of approaching the wall is

A progressive wave is represented by y = 12 sin (5t - 4x) cm. On this wave, how far away are the two points having phase difference of 90^circ ?

The resistivity of a wire at 20^circ C and 100^circ C is 3 Omega-m and 4 Omega-m respectively. The resistivity of the wire at 0^circ C is

When a vapour, at atmosphere pressure was gradually heated from 25^(circ)C its colour wasa found to deepen at first and then to fade as the temperature was raised above 160^(circ)C . At 600^(circ)C , the vapour was almost colourless, but its colour deepended when the pressure was raised at this temperature. The vapour was:

Which of the following does not give NO_(2) by heating at 500^(circ)C ?

A light ray is incident perpendicularly to one face of a 90^circ prism and is totally internally reflected at the glass-air interface. If the angle of reflection is 45^circ , we conclude that the refractive index n

On heating rhombic sulphur it melts but viscosity of liquid increases upto 200^(circ)C and beyond that it dercreases why?

If two mirrors are keps at 60^circ to each other, then the number of images formed by them is

A pale bule liquid is obtained by equuimolar mixture of two gases at - 30^(circ)C .