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Test: Structure Of The Atom- 1 - UPSC MCQ


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10 Questions MCQ Test - Test: Structure Of The Atom- 1

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Test: Structure Of The Atom- 1 - Question 1

Rutherford’s scattering experiment fails for very small scattering angles because

Detailed Solution for Test: Structure Of The Atom- 1 - Question 1

Rutherford's scattering formula fails for very small scattering angles because due to the strong repulsive force present between the α-particles and the nucleus and also the full nuclear charge of the target atom is partially screened by its electrons.

Test: Structure Of The Atom- 1 - Question 2

Identify the Mg atom from the following figures where, n and p represent the number of neutrons and protons respectively.

Detailed Solution for Test: Structure Of The Atom- 1 - Question 2

Electronic configuration of 12Mg atom = 2, 8, 2 

Number of protons in Mg atom = 2+ 8 + 2 = 12

Number of neutrons in Mg atom = 24 -12 = 12
[as mass number of Mg atom = 24 and number of neutrons = mass number – number of protons]

Therefore, option (d) is the correct answer.

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Test: Structure Of The Atom- 1 - Question 3

When alpha-particles are sent through a thin metal foil, most of them go straight through the foil because_______.

Detailed Solution for Test: Structure Of The Atom- 1 - Question 3

When alpha particles are sent through a thin metal foil, most of them go straight through the foil because most part of the atom is empty space. In other words, there is no obstruction in the path of alpha particles.

Test: Structure Of The Atom- 1 - Question 4

According to Bohr’s model, which of the following is true about electron orbits?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 4

Neils Bohr proposed that electrons revolve around the nucleus only in specific allowed orbits called discrete orbits or energy levels.

Test: Structure Of The Atom- 1 - Question 5

Which of the following subatomic particles have no charge?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 5

- Neutrons:
- Neutrons are subatomic particles found in the nucleus of an atom.
- They have no electric charge, making them neutral.
- Neutrons help stabilize the nucleus by reducing repulsive forces between positively charged protons.

- Protons:
- Positively charged particles located in the nucleus.

- Electrons:
- Negatively charged particles found outside the nucleus.

- Nucleons:
- A term for particles in the nucleus, including both protons and neutrons.

Test: Structure Of The Atom- 1 - Question 6

Rutherford’s a-particle scattering experiment showed that 
(i) electrons have negative charge 
(ii) the mass and positive charge of the atom is concentrated in the nucleus 
(iii) neutron exists in the nucleus 
(iv) most of the space in atom is empty 
Which of the above statements are correct?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 6

Points (ii) and (iv) are correct. An atom consists of a positively charged, dense and very small nucleus which have all the protons and neutrons. Positive charge is due to protons, as neutrons have no charge. Most of the space is empty because most of the alpha particles pass straight through the gold foil without any deflection.
Electrons have negative charge, it was explained by Thomson. The existance of neutron was discovered by Chadwick.

Test: Structure Of The Atom- 1 - Question 7

The atomic number of an element is equal to:

Detailed Solution for Test: Structure Of The Atom- 1 - Question 7

- The atomic number of an element is defined as the number of protons in the nucleus of an atom.
- Each element has a unique atomic number, which determines its identity and position in the periodic table.
- Protons are positively charged particles found in the nucleus.
- Electrons orbit the nucleus, but their number equals the atomic number only in neutral atoms.
- Neutrons are also in the nucleus but do not affect the atomic number.

Test: Structure Of The Atom- 1 - Question 8

Isotopes are atoms of the same element which have:

Detailed Solution for Test: Structure Of The Atom- 1 - Question 8

- Isotopes Definition: Isotopes are atoms of the same element with the same number of protons but different numbers of neutrons.

- Atomic Number: This is the number of protons in an atom's nucleus, which defines the element.

- Mass Number: This is the total number of protons and neutrons in an atom's nucleus.

- Correct Answer Explanation:
- Choice B describes isotopes accurately: they have different mass numbers due to varying neutrons, while their atomic number (protons) remains the same.

Test: Structure Of The Atom- 1 - Question 9

Isobars are atoms that have:

Detailed Solution for Test: Structure Of The Atom- 1 - Question 9

- Isobars are atoms with different elements.
- They have:
- Different atomic numbers (number of protons).
- The same mass number (sum of protons and neutrons).
- Therefore, the correct answer is:
- C: The same mass number but different atomic numbers.
- Isobars differ in chemical properties due to different proton numbers but have similar overall nuclear mass.

Test: Structure Of The Atom- 1 - Question 10

Which law states that "In a chemical substance, the elements are always present in definite proportions by mass"?

Detailed Solution for Test: Structure Of The Atom- 1 - Question 10

- The correct answer is B: Law of Definite Proportions.
- This law, also known as Proust's Law, states that a chemical compound always contains its component elements in a fixed ratio by mass.
- For example, water (H₂O) always contains hydrogen and oxygen in a mass ratio of about 1:8.

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