Structure of Atom Test

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Structure of Atom Test - 2

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Question 1
1 / -0

Cathode rays or cathode ray particles are

A
muons

B
protons

C
neutrons

D
electrons

Solution

Cathode rays - In 1897, British physicist J. J. Thomson showed the rays were composed of a previously unknown negatively charged particle, which was later named the electron.
Question 2
1 / -0

If an electron is moving with a kinetic energy of 3.96 x10^-34 J, calculate its de Broglie wavelength.

(Given: m = 9.1 x 10^-31 kg and h = 6.6 x 10^-34 kgm²s^-¹)

A
1.75 × 10²m

B
2.25 × 10^-2m

C
2.54 × 10^-2 m

D
2.54 × 10^-1 m
Question 3
1 / -0

According to Dalton’s atomic theory

A
Atoms are made of electrons, neutrons and protons

B
Atoms are indivisible

C
Atoms are made of neutrons and protons

D
Atoms are made of electrons and protons
Solution
Dalton has developed the theory of the structure of matter and this theory is known as Dalton’s atomic theory. His research was based on experiments and also from law of chemical combination. Dalton’s atomic theory was quickly explained the many heretofore unexplained chemical phenomena. Dalton’s atomic theory quickly became the theoretical foundation in chemistry.

Dalton’s atomic theory stated that:
- All the matter is made of atoms which are tiny particles and indivisible.
- All the given atom of the element is identical in mass, size, shape, and in other properties.
- All different elements have different types of atoms and also different in their mass, size, shape, and in other properties.
- All the atom of an element cannot be made or destroyed.
Question 4
1 / -0

The threshold frequency of a metal is 2.8 eV. If the radiation 2500 Å falls on the metal, then the kinetic energy of the emitted electron is:

A
8.321 x 10^-26J

B
7.91 x 10^-17 J

C
4.321 x 10^-19 J

D
3.471 x 10^-19 J
Question 5
1 / -0

An element 'X' has 16 electrons. Calculate the number of electrons present in the M-shell of the element in X^2- state.

A
32

B
16

C
8

D
2
Question 6
1 / -0

An electron revolves around the nucleus with a velocity of 3.05 x 10⁷ ms^-1. What is the wavelength of the electron?

A
3.38 × 10^-11 m

B
2.38 × 10^-11 m

C
23.8 × 10^-11 m

D
0.238 × 10^-11 m
Question 7
1 / -0

The radial distance between two peaks in the radial probability distribution curve of 2s-orbital is

A
2 Å

B
2.6 Å

C
2.1 Å

D
0.53 Å
Question 8
1 / -0

If the speed of a tennis ball is measured as 0.76 ms^-1 and mass as 35 g, then find the uncertainty in position.

A
1.76 × 10^-33 m

B
1.99 × 10^-33m

C
1.59 × 10^-19 m

D
1.82 × 10^-31 m
Question 9
1 / -0

The ratio of the radii of the 3^rd orbits of He⁺ and Li²⁺ is:

A
3 : 2

B
2 : 3

C
1 : 5

D
1 : 1
Question 10
1 / -0

Charge on the electron was determined by

A
R.A. Millikan's oil drop experiment

B
x-ray tube experiments

C
Electrical discharge carried out in the modified cathode ray tube

D
cathode ray discharge tube experiments

Solution

In 1909, Robert Millikan and Harvey Fletcher conducted the oil drop experiment to determine the charge of an electron. They suspended tiny charged droplets of oil between two metal electrodes by balancing downward gravitational force with upward drag and electric forces.

The experiment helped earn Millikan a Nobel prize in 1923

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Structure of Atom Test - 2

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Structure of Atom Test - 2

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Question 1

muons

protons

neutrons

electrons

Solution

Question 2

1.75 × 102 m

2.25 × 10-2 m

2.54 × 10-2 m

2.54 × 10-1 m

Question 3

Atoms are made of electrons, neutrons and protons

Atoms are indivisible

Atoms are made of neutrons and protons

Atoms are made of electrons and protons

Solution

Question 4

8.321 x 10-26 J

7.91 x 10-17 J

4.321 x 10-19 J

3.471 x 10-19 J

Question 5

32

16

8

2

Question 6

3.38 × 10-11 m

2.38 × 10-11 m

23.8 × 10-11 m

0.238 × 10-11 m

Question 7

2 Å

2.6 Å

2.1 Å

0.53 Å

Question 8

1.76 × 10-33 m

1.99 × 10-33 m

1.59 × 10-19 m

1.82 × 10-31 m

Question 9

3 : 2

2 : 3

1 : 5

1 : 1

Question 10

R.A. Millikan's oil drop experiment

x-ray tube experiments

Electrical discharge carried out in the modified cathode ray tube

cathode ray discharge tube experiments

Solution

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1.75 × 10²m

2.25 × 10^-2m

2.54 × 10^-2 m

2.54 × 10^-1 m

8.321 x 10^-26J

7.91 x 10^-17 J

4.321 x 10^-19 J

3.471 x 10^-19 J

3.38 × 10^-11 m

2.38 × 10^-11 m

23.8 × 10^-11 m

0.238 × 10^-11 m

1.76 × 10^-33 m

1.99 × 10^-33m

1.59 × 10^-19 m

1.82 × 10^-31 m