In an X-ray tube electrons bombarding the target produce X-rays of minimum wavelength 1 . What must be the energy of bombarding electrons

If =10, then it corresponds to

Pendulum A is a physical pendulum made from a thin rigid and uniform rod whose length is . One end of this rod is attached to the ceiling by a frictionless hinge so that rod is free to swing back and forth. Pendulum B is a simple pendulum whose length is also . The ratio for small angular oscillations-

When cathode rays strike a metal target of high melting point with very high velocity, then

A hollow metallic sphere of radius 10 cm is given a charge of . The electric intensity at a point 4 cm from the centre is

The correct order of basicities of the following compounds . ,is:
1)
2)
3)
4) 

The reaction, is:

Among the following; the strongest base is:

The derivative of even function is

For such questions, we should know the definition of even and odd function.

If [x] is the greatest integer not exceeding (x) then the set of discontinuity of f is...

then {x/f(x)}=

The order of reactivity of following alcohols, towards conc. HCl is:
i)
ii)
iii)
iv) 

In the following compounds piperidine
I) pyridine
II) morpho line
III) and pyrrole
IV) the order of basicity is:

Ifdenotes the greatestinterger not exceeding x and if the function f defined by the order pair (a,b)=

is continuous in the interval [0, ) then an ordered pair (a, b) is

Mosley measured the frequency (f) of the characteristic X-rays from many metals of different atomic number (Z) and represented his results by a relation known as Mosley's law. This law is (a, b are constants)