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Q1. Protons attract electrons. Then why do electrons not fall on the nucleus?

(a) Neutrons repel the electrons
(b) Electrons in ground state cannot radiate energy
(c) At very small distances, protons repel electrons
(d) Inner electrons repel those in outer orbitals

Q2. In the wave-mechanical model of an atom, degenerate energy levels have:

(a) Equal energy
(b) Equal number of electrons
(c) Same shape
(d) Electrons with the same spin

Q3. Avogadro?s number of water molecules occupy 22.4 liters of space at 273 K.

(a) True
(b) False
(c)
(d)

Q4. One unified atomic mass unit equals to ____________

(a) 1/12 of molar mass of Carbon
(b) 1/16 of atomic mass of Oxygen
(c) 1/2 of the molecular mass of Hydrogen
(d) all of the mentioned

Q5. Which if the following is not an SI unit?

(a) Kilogram
(b) Mole
(c) Atomic Mass Unit
(d) Coulomb

Q6. Which of the following is not a pure form of matter?

(a) Element
(b) Compound
(c) Solution
(d) Both Compound and Solution

Q7. Which of the following has the least number of atoms?

(a) One gram of Hydrogen gas
(b) One gram of Helium gas
(c) One gram-mole of Oxygen gas
(d) One gram-mole of Chlorine gas

Q8. Oxygen gas is denser than Carbon Dioxide gas?

(a) True
(b) False
(c)
(d)

Q9. . Atomic number of a species is the number of:

(a) Neutrons
(b) Protons
(c) Valence electrons
(d) Nucleons

Q10. Species with the same number of neutrons but the different number of protons are called:

(a) Isotones
(b) Isotopes
(c) Isomers
(d) Isobars


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1 Answer
421 views

Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

Modified 242 Year Ago

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242 Year Ago

Assertion : Cathode Rays Do Not Travel In Straight Lines. Reason : Cathode Rays Penetrate Through Thick Sheets.

0 votes
1 Answer
415 views

E/m Ratio Was Determined By

Modified 242 Year Ago

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242 Year Ago

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1 Answer
400 views

Magnitude Of K.E. In An Orbit Is Caused By

Modified 242 Year Ago

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242 Year Ago

Magnitude Of K.E. In An Orbit Is Caused By

0 votes
1 Answer
341 views

The Minimum Real Charge On Any Particle Which Can Exist Is

Modified 242 Year Ago

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242 Year Ago

The Minimum Real Charge On Any Particle Which Can Exist Is

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1 Answer
335 views

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

Modified 242 Year Ago

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242 Year Ago

Assertion : Cathode Rays Are A Stream Of α -particles. Reason : They Are Generated Under High Pressure And High Voltage.

0 votes
1 Answer
322 views

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

Modified 242 Year Ago

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242 Year Ago

The Average Distance Of An Electron In An Atom From Its Nucleus Is Of The Order Of

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