| 1 |
The experimental evidences for the existence of atomic nucleus comes from:
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A. Line spectrum of hydrogen.
B. Magnetic bonding of cathode rays.
C. Millikan oil drop experiment.
D. Scattering of alpha particles by thin metal foil.
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| 2 |
Which one of the following particles has amass 1/1836 time, that of hydrogen?
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A. Neutron.
B. Proton.
C. Electron.
D. Positron.
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| 3 |
When 6d orbital is complete, the entering electron goes into:
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A. 7f.
B. 7s.
C. 7p.
D. 7d.
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| 4 |
The divisibility of atom was shown by
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A. Stoney
B. J.J. Thomson
C. Millikan
D. Rutherford
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| 5 |
The velocity of photon is:
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A. Independent of its wavelength.
B. Depends on its wavelength.
C. Equal to square of its amplitude
D. Depends on its source.
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| 6 |
The nature of positive ray depend on:
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A. The nature of electrode.
B. The nature of discharge tube.
C. The nature of residual gas.
D. All of above.
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| 7 |
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A. s
B. p
C. d
D. f
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| 8 |
The charge over mass ratio of electron is:
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| 9 |
Electrons in degenerate orbitals are placed in separate orbitals with same spin according to
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A. Hund's rule
B. Pauli exclusion principle
C. Aufbau principle
D. Mosley's law
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| 10 |
The e.m value for positive rays maximum for:
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A. Oxygen.
B. Nitrogen.
C. Helium.
D. Hydrogen.
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| 11 |
Energy of electron in an orbit according to Bohr theory is negative due to
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A. Repulsion of electrons in the same orb
B. At infinity energy is zero ad a traction towards nucleus decreases energy
C. Electron has negative charge
D. Product of positive nuclear charge and negative charge is negative
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| 12 |
When electrons revolve in stationary orbits
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A. There is no change in energy level
B. They vecome stationary
C. They are gaining kinetic energy
D. There is increase in energy
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| 13 |
1 erg of energy corresponds to
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A. 6.02 x 1023J/mol
B. 6.02 x 1016J/mol
C. 1 erg/mol
D. 10-7J/mol
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| 14 |
The quantum number which determines the shape of the orbital is
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A. principal
B. azimuthal
C. magnetic
D. spin
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| 15 |
The maximum number of electrons in a subshell for which l = 3 is
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A. 14
B. 10
C. 8
D. 4
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| 16 |
In the ground state, an element has 13 electrons in its M shell. The element is
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A. Copper
B. Chromium
C. Nickel
D. Iron
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| 17 |
Alpha rays consist of:
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A. Neutrons.
B. Helium nucleus.
C. Protons.
D. Hydrogen nucleus.
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| 18 |
For principle quantum number n=4, the total number of orbitals having l = 3 is
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A. 3
B. 7
C. 5
D. 9
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| 19 |
When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
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A. Cathode rays are material particles
B. Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
C. Cathode rays are absorbed by the nucleus
D. Cathode rays become heated
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| 20 |
Splitting of spectral lines when atoms are subjected to strong electric field is called:
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A. Zeeman effect.
B. Stark effect
C. Photoelectric effect.
D. Compton effect.
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| 21 |
Subsidiary quantum number specifies
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A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability
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| 22 |
Which quantum number is sufficient to describe the electron is hydrogen atom?
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A. l
B. n
C. m
D. s
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| 23 |
The radiations with wavelength shorter than violet light are called
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A. Ultraviolet
B. Infrared
C. Microwave
D. Radio frequency
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| 24 |
If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be
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A. 1
B. 4
C. 9
D. 12
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| 25 |
The de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is
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A. 6.63 x 10-33m
B. 6.63 x 10-34m
C. 6.63 x 10-35m
D. 6.65 x 10-35m
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| 26 |
The energy of the first electron is helium will be
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A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero
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| 27 |
No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is
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A. Voltage is low
B. Discharge tube is not coloured
C. Gas does not conduct current under ordinary pressure
D. Temperature low
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| 28 |
Rutherford's model of atom failed because:
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A. The atom did o have a nucleus and electrons
B. It did not account fro the attraction b/w protons and neutrons
C. It did no account for the stability of the atom.
D. There is actually no space b/w the nucleus ad the electrons.
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| 29 |
Energy of electron in first orbit of H atom is
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A. -45.32 KJ/mole
B. -82.08 KJ/mole
C. -52.53 KJ/mole
D. -1313.31 KJ/mole
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| 30 |
Mass of simple electron is:
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