1. A body of mass 10 mg is moving with a velocity of \[100 ms^{-1}\] . The wavelength of de-Broglie's wave associated with it would be

a) \[6.63 ×10^{-35}m\]

b) \[6.63 ×10^{-31}m\]

c) \[6.63 ×10^{-37}m\]

d) \[6.63 ×10^{-34}m\]

Explanation:

2. If \[N_{0}\] represents the Avogadro number, then which of the following represent correct value of one atomic mass unit.

a) \[N_{0}*10^{-3} kg\]

b) \[N_{0}g\]

c) \[N_0^{-1}g\]

d) \[\frac{1}{16}\] Mass of 0-16 atom

Explanation:

3. If the shortest wavelength of the spectral line of H-atom in the Lyman series is X, then the longest wavelength of the line in Balmer series of \[Li^{2+}\] is

a) 9x

b) \[\frac{x}{9}\]

c) \[\frac{5x}{4}\]

d) \[\frac{4x}{5}\]

Explanation:

4. If the subsidiary quantum number of a sub-energy level is 4, the maximum and minimum values of the spin multiplicities are

a) 10, 2

b) 4, – 4

c) 10, 1

d) 9, 1

Explanation:

5. \[Li^{3+}\] and a proton are accelerated by the same potential, then de-Broglie wavelengths \[\lambda_{Li}and \lambda_{p}\] have the ratio
assume \[\left(m_{Li}=9m_{p}\right)\]

a) \[1 :3\sqrt{3}\]

b) 1 : 1

c) 1 : 2

d) 1 : 4

Explanation:

6. One Bohr magnet on is equal to

a) \[\frac{c}{4\pi hm_{e}}\]

b) \[\frac{h}{4\pi em_{e}}\]

c) \[\frac{eh}{4\pi m_{e}}\]

d) \[\frac{hc}{4\pi m_{e}}\]

Explanation:

7. The dissociation energy of H_{2} is \[ 430.53 KJ mol^{-1}\] . If hydrogen is dissociated by illumination with radiation of wavelength 253.7 nm the fraction of the radiant energy which
will be converted into kinetic energy is given by

a) 100%

b) 8.76%

c) 2.22%

d) 1.22%

Explanation:

8. The magnetic moment of \[ M^{x+}\](atomic number M = 25) is \[\sqrt{15}BM\]. The number of unpaired elections and the value of x respectively are

a) 5, 2

b) 3, 2

c) 3, 4

d) 4, 3

Explanation:

9. The threshold frequency of a metal is \[1 ×10^{15}s^{-1}\] . The ratio of the maximum kinetic energies of the photoelectrons when the metal is irradiated with radiations of frequencies
\[1.5 ×10^{15}s^{-1}, 2.0 ×10^{15}s^{-1}\] respectively would be

a) 4 : 3

b) 1 : 2

c) 2 : 1

d) 3 : 4

Explanation:

10. The ratio of magnetic moments of Fe(III) and Co(II) is

a) 7 : 3

b) 3 : 7

c) \[\sqrt{7}: \sqrt{3}\]

d) \[\sqrt{3}: \sqrt{7}\]

Explanation: