Atoms Test

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Atoms Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

An element X has mass number 10, and number of neutrons = 7. Then what will be the number of proton?

A
10

B
3

C
7

D
17

Solution

Mas number of any element is equal to sum of proton and neutrons
$$\therefore A = p+n$$
So, $$ p=A-n= 10-7=3$$
Question 2
1 / -0

The lamp whose working is based on a discharge tube is ________ .

A
Fluorescent lamp

B
Incandescent lamp

C
CFL

D
Both (A) and (C)

Solution

Both A and C
Fluroscent lamp and compact fluroscent lamp works based on the low pressure gas discharge principle. The glass tube if low pressure gas discharge lamp is filled with noble gas at low pressure and small quantity of mercury.
Question 3
1 / -0

The fluorescence of the glass (discharge) tube at very low pressure is characteristic of ________ .

A
the phosphors in the material of the glass

B
the gas used in the tube

C
the cathode

D
all the above

Solution

Fluorescence is the emission of light by a substance that as absorbed light as other electromagnetic radiation. It occurs due to presence of phosphorous in the metal tube. Because phosphorous is a material that glows when exposed to electrical energy. Because actual conversion of electrical to light energy takes place on display screen when electron strike phosphorous.
Question 4
1 / -0

An element has number of electrons = 2. Then what will be its atomic number?.

A
1

B
4

C
3

D
2

Solution

Atomic number of any element is equal to number of protons or number of electrons
Atomic no = no of proton = no of electron
Question 5
1 / -0

A modified discharge tube is used as a ________ .

A
cathode ray oscilloscope

B
fluorescent tube

C
x-ray tube

D
all the above

Solution

A discharge tube is a tube containing charged electrodes and filled with a gas in which ionization is induced by an electric filed. X-ray tube, fluroscent tube and cathode rays oscilloscope can be used as a modified discharge tube in which these tubes contain charged electrodes and filled with a gas.
Question 6
1 / -0

If an element has 22 electrons then what will be its atomic number?

A
10

B
25

C
15

D
22

Solution

Atomic number of any element is equal no of electron.
Atomic no. = no. of proton = no of electron
Question 7
1 / -0

If an element X has mass number and number of proton 8 then identify element X

A
C

B
N

C
O

D
Ar

Solution

Atomic No = no of proton = 8
Oxygen has atomic number 8. So, element X
Question 8
1 / -0

An element necessarily have same

A
No. of protons

B
No. of electrons

C
No. of nuetrons

D
All

Solution

$$Answer:-$$ A
For isotopes we say they have atomic number.
Isotopes are atoms with the same number of protons but that have a different number of neutrons. Since the atomic number is equal to the number of protons and the atomic mass is the sum of protons and neutrons, we can also say that isotopes are elements with the same atomic number but different mass .
Question 9
1 / -0

Choose the wrong statement:

A
Alpha particles can be scattered by Gold nucleus

B
X-ray can be diffracted by crystals

C
UV radiation can cause Photoelectric effect

D
Electrons cannot be diffracted by crystals

Solution

Fast moving electrons are associated with wave and hence they show diffraction.
Question 10
1 / -0

Smallest particle in a chemical element or compound that has the chemical properties of that element or compound is

A
Atom

B
Molecule

C
Mixture

D
Element

Solution

A molecule is it smallest particle in a chemical element or compound. They are made up of atomic that are held by chemical bonds.

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Atoms Test - 19

Result

Atoms Test - 19

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SHARING IS CARING

Question 1

10

3

7

17

Solution

Question 2

Fluorescent lamp

Incandescent lamp

CFL

Both (A) and (C)

Solution

Question 3

the phosphors in the material of the glass

the gas used in the tube

the cathode

all the above

Solution

Question 4

1

4

3

2

Solution

Question 5

cathode ray oscilloscope

fluorescent tube

x-ray tube

all the above

Solution

Question 6

10

25

15

22

Solution

Question 7

C

N

O

Ar

Solution

Question 8

No. of protons

No. of electrons

No. of nuetrons

All

Solution

Question 9

Alpha particles can be scattered by Gold nucleus

X-ray can be diffracted by crystals

UV radiation can cause Photoelectric effect

Electrons cannot be diffracted by crystals

Solution

Question 10

Atom

Molecule

Mixture

Element

Solution

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