Atoms Online Objective Test | Atoms Online Objective Test

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q1. Emission line spectrum of atoms contains

A. Only a few colors in the form of isolated sharp parallel lines generally produced by chilled gases

B. All colors in the form of isolated sharp parallel lines generally produced by heated resistances

C. Only a few colors in the form of isolated sharp parallel lines generally produced by heated gases

D. All colors of visible light without sharp boundaries

Answer : Option C
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q2. Absorption line spectrum is obtained

A. If we pass white (continuous-spectrum) light through a hot gas

B. If we pass white (continuous-spectrum) light through a cool gas

C. If we pass off-white (discrete-spectrum) light through a cool gas

D. If we pass off-white (discrete-spectrum) light through a hot gas

Answer : Option B
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q3. To produce an emission spectrum of hydrogen

A. It needs to be cool liquid form

B. It needs to be cold and white light shining through

C. It needs to be hot and white light shining through

D. It needs to be in glowing gaseous form

Answer : Option D
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q4. Emission line spectra of different elements

A. is the same if both elements are in liquid form

B. is the same if both elements are at the same temperature

C. is different

D. is not different

Answer : Option C
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q5. Which of these statements about Bohr model is correct?

A. Bohr model is based classical electromagnetic theory

B. Bohr model postulates wavy paths around the nucleus

C. Bohr model is pure quantum mechanical theory

D. Bohr model combines classical and early quantum concepts

Answer : Option D
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q6. Which of these statements about Bohr model hypothesis is correct?

A. radius of electron is quantized

B. velocity of electron is quantized

C. angular momentum of electron is quantized

D. mass of electron is quantized

Answer : Option C
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q7. Which of these statements about De Broglie Explanation of Bohr model is correct?

A. electron in its circular orbit, as proposed by Bohr, must be seen as electromagnetic wave

B. travelling wave is formed on a circular orbit where integral number of de Broglie Wavelengths fit into the circumference of the orbit

C. Standing wave is formed on a circular orbit where integral number of de Broglie wavelengths fit into the circumference of the orbit

D. electron in its circular orbit, as proposed by Bohr, must be seen as a particle .

Answer : Option C
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q8. Which of these statements about Bohr model applied to hydrogen atom correct?

A. hydrogen atom in quantized orbits radiates electromagnetic waves

B. hydrogen atom in some orbits radiates electromagnetic waves

C. hydrogen atom in its ground level has magnetic moment due to orbital motion

D. hydrogen atom in its ground level has no magnetic moment due to orbital motion

Answer : Option C
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q9. Fluorescence is

A. it consists of accelerated atoms/molecules striking suitable material

B. it consists of a molecule, atom or nanostructure relaxing to its ground state by emitting a photon of light after being excited to a higher quantum state by some type of energy

C. what happens in a fluorescent lamp

D. it consists only of atoms going into stable excited states

Answer : Option B
Explaination / Solution:
No Explaination.

# Atoms # CBSE 12TH PHYSICS Prepare / Learn

Q10. Reason why there are many lines in an atomic spectrum is because

A. There are many atoms in different states of excitation making transition to different states

B. There are many atoms in different states of excitation making transition to the same state

C. All atoms are in the same excited state and make transition to different states

D. All atoms are in the same excited state and make transition to same state

Answer : Option A
Explaination / Solution:
No Explaination.

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