Dual Nature of Radiation and Matter — Physics STD 12 Science — Question

Kirchoff's junction law is equivalent to ___________.

Ionization energy of a hydrogen-like ion A is greater than that of another hydrogen-like ion B. Let r, u, E and L represent the radius of the orbit, speed of the electron, energy of the atom and orbital angular momentum of the electron respectively. In ground state:

3 identical bulbs are connected in series and these together dissipate a power P. If now the bulbs are connected in parallel, then the power dissipated will be

(a)

(b) 3P

(c) 9P

(d)

If critical angle for a material to air is 30^o, the refractive index of the material will be

(a) 1.0

(b) 1.5

(c) 2.0

(d) 2.5

A uniform electric field and a uniform magnetic field are produced, pointed in the same direction. An electron is projected with its velocity pointing in the same direction

(a) The electron will turn to its right

(b) The electron will turn to its left

(c) The electron velocity will increase in magnitude

(d) The electron velocity will decrease in magnitude

An e.m.f. of 12 volt is produced in a coil when the current in it changes at the rate of 45 amp/minute. The inductance of the coil is

(a) 0.25 henry

(b) 1.5 henry

(c) 9.6 henry

(d) 16.0 henry

In which of the following remote sensing technique is not used

(a) Forest density

(b) Pollution

(c) Wetland mapping

(d) Medical treatment

A convex mirror is used to form the image of an object. Then which of the following statements is wrong

(a) The image lies between the pole and the focus

(b) The image is diminished in size

(c) The image is erect

(d) The image is real

Potential due to charge q at its own location is: