An electron experiences a force equal to its weight when placed in an electric field. The intensity of the field will be
|
(a) 1.7 |
(b) 5.0 |
(c) 5.5 |
(d) 56 N/C |
(c) 5.5 
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Specific rotation of sugar solution is 0.01 SI units. 200 
of impure sugar solution is taken in a polarimeter tube of length 0.25m and an optical rotation of 0.4rad is observed. The percentage of purity of sugar is the sample is
|
(a) 80% |
(b) 89% |
(c) 11% |
(d) 20% |
Which of the following statements are true regarding Bohr's model of hydrogen atom
(I) Orbiting speed of electron decreases as it shifts to discrete orbits away from the nucleus
(II) Radii of allowed orbits of electron are proportional to the principal quantum number
(III) Frequency with which electrons orbits around the nucleus in discrete orbits is inversely proportional to the principal quantum number
(IV) Binding force with which the electron is bound to the nucleus increases as it shifts to outer orbits Select correct answer using the codes given below
Codes :
|
(a) I and III |
(b) II and IV |
(c) I, II and III |
(d) II, III and IV |
The spectral series of the hydrogen spectrum that lies in the ultraviolet region is the
|
(a) Balmer series |
(b) Pfund series |
(c) Paschen series |
(d) Lyman series |
Velocity of light in a medium is 1.5 
. Its refractive index will be
|
(a) 8 |
(b) 6 |
(c) 4 |
(d) 2 |