Structure of the Atoms Test

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Structure of the Atoms Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following air pressures in the discharge tube is appropriate for the production of cathode rays?

A
0.001 cm

B
1 mm

C
0.001 mm

D
1 cm

Solution

Cathode rays are produced in cathode tube having a very high voltage and a low pressure. A pressure of 0.001 mm is appropriate for the production of cathode rays.
Question 2
1 / -0

Rutherford’s alpha-particle experiment was responsible for discovery of :

A
Proton

B
Nucleus

C
Electron

D
Neutron

Solution

Rutherford’s alpha-particle experiment was responsible for the discovery of nucleus of an atom. The alpha particles passing close to the nucleus deviated from their path and the ones hitting the "central charged region" bounced back.
Question 3
1 / -0

According to 2n²rule, which shell in an atom can accomodate 32 electrons :

A
L-shell

B
M-shell

C
K-shell

D
N-shell

Solution

K shell means n = 1, L means n = 2 and M shell means n = 3 and N shell means n = 4.
Number of electrons in N-shell = 2n² = 2(4)²= 2 x 16 = 32 electrons
Question 4
1 / -0

If K and L shells of an atom are full, then what would be the number of electrons in the atom?

A
18

B
10

C
8

D
2

Solution

K shell (n = 1) of an atom contains a maximum of 2 electrons and L shell (n = 2) contains a maximum of 8 electrons. Therefore, if K and L shells of an atom are full, then the number of electrons in the atom is 2 + 8 = 10.
Question 5
1 / -0

What is the e/m value of an electron?

A
1.8 × 10¹² C/kg

B
1.76 × 10¹¹ C/kg

C
1.6 × 10¹¹ C/kg

D
None of these

Solution

The charge on an electron is 1.6 x 10^-19 C and mass of one electron is 9.1 x 10^-31kg. Therefore e/m ratio will be 1.6 x 10^-19 C / 9.1 x 10^-31kg = 1.76 x 10¹¹C/kg
Question 6
1 / -0

The main subatomic particles of a nucleus are :

A
Electrons & protons

B
Electrons & neutrons

C
Protons & neutrons

D
None of the above

Solution

The main subatomic particles of a nucleus are protons and neutrons. These are collectively called nucleons.

Electrons are located in different shells outside the nucleus of an atom.

Question 7

1 / -0

Match the following with the correct response :

(1) Electron	(A) E.Goldstein
(2) Proton	(B) Rutherford
(3) Neutron	(C) James Chadwick
(4) Atomic nucleus	(D) J.J.Thomson

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

Solution

(1) Electron	(D) Discovered by J.J.Thomson
(2) Proton	(A) Discovered by E.Goldstein
(3) Neutron	(C) Discovered by James Chadwick
(4) Atomic nucleus	(B) Discovered by Rutherford

Question 8

1 / -0

Match the following with the correct response :

(1) Canal rays consist of positively charged particles protons	(A) Rutherford
(2) Electrons are distributed in shells	(B) J.J.Thomson
(3) Centre of an atom is dense	(C) J.Dalton
(4) Atom is indivisible	(D) Neils Bohr

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

Solution

(1) Canal rays consist of positively charged particles protons	(B) J.J.Thomson
(2) Electrons are distributed in shells	(D) Neils Bohr
(3) Centre of an atom is dense	(A) Rutherford
(4) Atom is indivisible	(C) J.Dalton

Question 9

1 / -0

Match the following with the correct response :

(1) Discovery of subatomic particles	(A) Positively charged
(2) Energy levels	(B) Orbits
(3) Universal particles	(C) Discharge tube
(4) Canal rays	(D) Electrons

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

Solution

(1) Discovery of subatomic particles	(C) Discharge tube
(2) Energy levels	(B) Orbits
(3) Universal particles	(D) Electrons
(4) Canal rays	(A) Positively charged

Question 10

1 / -0

Match the following with the correct response :

(1) Valency	(A) Combining capacity of an atom
(2) Metals	(B) Gain electrons to became stable
(3) Non-metals	(C) Lose electrons to become stable
(4) Noble gases	(D) They have stable configuration

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

Solution

(1) Valency	(A) Combining capacity of an atom
(2) Metals	(C) Lose electrons to become stable
(3) Non-metals	(B) Gain electrons to became stable
(4) Noble gases	(D) They have stable configuration

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Structure of the Atoms Test - 6

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Structure of the Atoms Test - 6

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Question 1

0.001 cm

1 mm

0.001 mm

1 cm

Solution

Question 2

Proton

Nucleus

Electron

Neutron

Solution

Question 3

L-shell

M-shell

K-shell

N-shell

Solution

Question 4

18

10

8

2

Solution

Question 5

1.8 × 1012 C/kg

1.76 × 1011 C/kg

1.6 × 1011 C/kg

None of these

Solution

Question 6

Electrons & protons

Electrons & neutrons

Protons & neutrons

None of the above

Solution

Question 7

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

Solution

Question 8

1-B, 2-D, 3-A, 4-C

1-C, 2-B, 3-D, 4-A

1-D, 2-A, 3-C, 4-B

1-A, 2-C, 3-B, 4-D

Solution

Question 9

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

1-A, 2-C, 3-B, 4-D

Solution

Question 10

1-A, 2-C, 3-B, 4-D

1-D, 2-A, 3-C, 4-B

1-C, 2-B, 3-D, 4-A

1-B, 2-D, 3-A, 4-C

Solution

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1.8 × 10¹² C/kg

1.76 × 10¹¹ C/kg

1.6 × 10¹¹ C/kg