Atoms and Nuclei Test

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Atoms and Nuclei Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

Each element is associated with

A
with a characteristic absorption of monochromatic light

B
with a characteristic spectrum of radiation

C
with a characteristic radiation of monochromatic light

D
no light radiation or absorption

Solution

There is an intimate relationship between the internal structure of an atom and the spectrum of radiation emitted by it.
Question 2
1 / -0

For ionising an excited hydrogen atom, the magnitude of energy required (in eV) will be

A
a little less than 13.6

B
13.6

C
more than 13.6

D
3.4 or less
Question 3
1 / -0

According to ‘plum pudding model’ atoms on the whole are electrically neutral because

A
there are equal numbers of positive charges and negatively charged electrons present in it

B
the positive charge of the atom is uniformly distributed throughout the volume of the electron and the negative charge of electrons balances positive parts

C
positive charge is concentrated at one place and negative charge is elsewhere

D
the negative charge of the atom is uniformly distributed throughout the volume of the atom and the positively charged electrons are embedded in it

Solution

This atom model was proposed by JJ Thomson before the discovery of the atomic nucleus. When Thomson discovered the negative electron, he realized that atoms had to contain some positive charge material equal to the negative electrons – otherwise the atom wouldn't be electrically neutral. According to this model, the positive charge of the atom is uniformly distributed throughout the volume of the atom and the negatively charged electrons were embedded in it like seeds in a watermelon.
Question 4
1 / -0

Mass equivalent to an energy of 931 MeV is

A
6.02 x 10^–27 kg

B
1.66 x 10^–27 kg

C
16.66 x 10^–27 kg

D
6.02 x 10^–22 kg
Question 5
1 / -0

There is a beam of electrons and protons moving parallel to each other in the same direction. Then they

A
attract each other

B
repel each other

C
no relation

D
neither attract nor repel
Question 6
1 / -0

The material used for making thermionic cathode must have

A
low work function and low melting point

B
low work function and high melting point

C
high work function and high melting point

D
high work function and low melting point
Question 7
1 / -0

The following question has four choices out of which ONLY ONE is correct.

Activity of a radioactive sample decreases to (1/3)rd of its original value in 3 days. Then, in 9 days its activity will become

A
(1/27) of the original value

B
(1/9) of the original value

C
(1/18) of the original value

D
(1/3) of the original value
Question 8
1 / -0

If λ = 10^-10 m changes to λ = 0.5 × 10^-10 m, find the energy difference (△E) given to the particle.

A
△E is equal to (1/4)^th of initial energy.

B
△E is equal to (1/2)^th of initial energy.

C
△E is equal to twice of initial energy.

D
△E is equal to initial energy.
Question 9
1 / -0

What is the radius of the first orbit of H atom?

A
0.53 Å

B
0.65 Å

C
0.85 Å

D
0.94 Å
Question 10
1 / -0

Which of these statements correctly describe the atomic model according to classical electromagnetic theory ?

A
The waves emitted by electrons are discrete

B
Electrons do not radiate electromagnetic waves

C
The positive charge and negative electron cancel and no waves are radiated

D
The electrons would spiral inwards and fall into the nucleus

Solution

The electrons revolve round their permitted orbits with acceleration and continuously radiate energy in the form of electromagnetic waves. Due to this continuous loss of energy, they would spiral inward and eventually fall into the nucleus.(Classical theory)

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Re-Attempt Weekly Quiz Competition

Atoms and Nuclei Test - 2

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Atoms and Nuclei Test - 2

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SHARING IS CARING

Question 1

with a characteristic absorption of monochromatic light

with a characteristic spectrum of radiation

with a characteristic radiation of monochromatic light

no light radiation or absorption

Solution

Question 2

a little less than 13.6

13.6

more than 13.6

3.4 or less

Question 3

there are equal numbers of positive charges and negatively charged electrons present in it

the positive charge of the atom is uniformly distributed throughout the volume of the electron and the negative charge of electrons balances positive parts

positive charge is concentrated at one place and negative charge is elsewhere

the negative charge of the atom is uniformly distributed throughout the volume of the atom and the positively charged electrons are embedded in it

Solution

Question 4

6.02 x 10–27 kg

1.66 x 10–27 kg

16.66 x 10–27 kg

6.02 x 10–22 kg

Question 5

attract each other

repel each other

no relation

neither attract nor repel

Question 6

low work function and low melting point

low work function and high melting point

high work function and high melting point

high work function and low melting point

Question 7

(1/27) of the original value

(1/9) of the original value

(1/18) of the original value

(1/3) of the original value

Question 8

△E is equal to (1/4)th of initial energy.

△E is equal to (1/2)th of initial energy.

△E is equal to twice of initial energy.

△E is equal to initial energy.

Question 9

0.53 Å

0.65 Å

0.85 Å

0.94 Å

Question 10

The waves emitted by electrons are discrete

Electrons do not radiate electromagnetic waves

The positive charge and negative electron cancel and no waves are radiated

The electrons would spiral inwards and fall into the nucleus

Solution

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6.02 x 10^–27 kg

1.66 x 10^–27 kg

16.66 x 10^–27 kg

6.02 x 10^–22 kg

△E is equal to (1/4)^th of initial energy.

△E is equal to (1/2)^th of initial energy.