Structure Of Atom - Practice Test(1) - Class 9 MCQ

Atoms are made of neutrons and protons

Atoms are indivisible

Atoms are made of electrons, neutrons and protons

Atoms are made of electrons and protons

The stationary states for electron are numbered n = 1,2,3.......... These integral numbers are known as Principal quantum numbers.

The most important property associated with the electron, is the energy of its stationary state. It is given by the expression 

The radii of the stationary states are expressed as : r_n = n² a⁰ (2.12) where a⁰ = 52.9 pm. As n increases the value of r will increase. In other words the electron will be present away from the nucleus

Radiation should exhibit both particle and wavelike properties  

nucleus

protons

electrons

neutrons

6, 7 and 9 neutrons and 6 protons

6, 8 and 9 neutrons and 6 protons

6, 7 and 8 neutrons and 6 protons

7, 8 and 9 neutrons 6 protons

lines appear in the infrared spectral region

lines appear in the microwave spectral region

lines appear in the visible spectral region

lines appear in the ultraviolet spectral region

protons

muons

electrons

neutrons

there are no uncertainties at all

the associated uncertainties are hardly of any real consequence

the associated uncertainties are unacceptable

the associated uncertainties are very important

phosphorescence of protons on the television screen

fluorescence of cathode rays on the television screen

fluorescence of canal rays on the television screen

fluorescence of protons on the television screen

26 protons, 30 neutrons, 26 electrons

26 protons, 30 neutrons, 23 electrons

23 protons, 33 neutrons, 20 electrons

23 protons, 33 neutrons, 26 electrons

Hydrogen

deuterium

oxygen

carbon

  depends on cathode material

 depends on electrical field

depends on magnetic field

 is constant

motions of the microscopic objects that have only particle like properties

motions of the macroscopic objects that have only particle like properties

motions of the macroscopic objects that have both observable wave like and particle like properties

motions of the microscopic objects that have both observable wave like and particle like properties

1.67492 x10^-27kg

1.672614 x 10^-27kg

1 .758820 x 10¹¹

9 .1094 x 10⁻³¹ kg

16 and 8

16 and 14

16 and 15

32 and 16

equal to or greater than h/2π

equal to or greater than h/ π

equal to or greater than h/3π

equal to or greater than h/4π.

R.A. Millikan's oil drop experiment

cathode ray discharge tube experiments

x-ray tube experiments

Electrical discharge carried out in the modified cathode ray tube

Principal quantum number, Azimuthal quantum number or orbital angular momentum and spin quantum number

Azimuthal quantum number or orbital angular momentum, Principal quantum number, and spin quantum number.

Azimuthal quantum number or orbital angular momentum, Principal quantum number, and Magnetic orbital quantum number.

Principal quantum number, Azimuthal quantum number or orbital angular momentum and Magnetic orbital quantum number.

Energy of the ejected electrons

wave number

radiation emitted by a black body

energy of quantum

Bracket series

Balmer series

Lyman series

Paschen series

electrons swarm like flies around nucleus

electrons are embedded in a positively charged pudding or water melon

electrons oscillate about the nucleus

electrons move in circular orbits around nucleus

n = 1, 2, 3..; l = 0, 1,.. n-1; ml = -l,-l+1, ..0,1..l-1, l

n = 1,2,3..; l = 0,1,..n; ml = -l,-l+1, ..0,1..l-1, l

n = 1,2,3.; l = 0,1,..n; ml = -l,-l+1, ..0,1

n = 1,2,3..; l = 0,1,..n-1; ml = 0,1..l-1, l

1 .72 x 10³ 

 1.72x 10⁵ m⁻¹

1 .72 x 10⁶ m⁻¹

1 .72 x 10² m⁻¹

32

30

29

35

4f

4d

3d

4p

electron

radioactivity

nucleus

proton