Naeem Academy - Test.take

Question 1 :-

The term biosphere refers to:

a:

Rocks and minerals

b:

Plants and animals

c:

Water sources

d:

Atmosphere and lithosphere

Question 2 :-

The boundary between troposphere and stratosphere is known as:

a:

Tropopause

b:

Ionopause

c:

Stratopause

d:

Mesopause

Question 3 :-

Ozone hole is:

a:

Increase in the concentration of ozone

b:

Hole in the ozone layer

c:

Depletion of the ozone layer in the troposphere

d:

Depletion of the ozone layer in the stratosphere

Question 4 :-

If an object is present at a distance of 5 km from the surface of the earth, it is present in:

a:

Troposphere

b:

Thermosphere

c:

Mesosphere

d:

N.O.T

Question 5 :-

The uppermost layer of atmosphere is known as:

a:

Ionosphere

b:

Troposphere

c:

Stratosphere

d:

Exosphere

Question 6 :-

Which of the following determines the identity of a chemical element?

a:

The number of neutrons

b:

The number of protons

c:

The sum of the number of protons and neutrons

d:

The number of electrons

Question 7 :-

Which of the following particles is positively charged in an atom?

a:

Protons

b:

Neutrons

c:

Electrons

d:

Both a and b

Question 8 :-

Isotopes of a neutral atom have:

a:

An equal number of neutrons

b:

A different number of protons

c:

The same mass numbers

d:

The same number of electrons

Question 9 :-

What is the number of protons in an element with atomic number 17 and mass number 37?

a:

17

b:

20

c:

22

d:

21

Question 10 :-

Deuterium is an isotope of a hydrogen atom. It contains_________

a:

One neutron and two protons

b:

No neutrons and one proton

c:

One proton and one neutron

d:

One electron and two neutron

Question 11 :-

Find the number of neutrons in a Zn2+ ion. The mass number is 70.

a:

40

b:

36

c:

38

d:

34

Question 12 :-

The number of electrons in a neutral atom represents its:

a:

Atomic number

b:

Atomic mass

c:

Mass number

d:

Number of nucleons

Question 13 :-

Elements having the same atomic number but different mass numbers are called:

a:

Isotones

b:

Isotopes

c:

Isobars

d:

None of the above

Question 14 :-

Which of the following contribute mainly to the mass of an atom?

a:

Neutron and electron

b:

Proton and electron

c:

Neutron and proton

d:

None of the above

Question 15 :-

Two atoms are said to be Isobars if :

a:

They have same atomic number but different mass number

b:

They have same number of electrons but different number of neutrons

c:

They have the same number of neutrons but different numbers of electrons.

d:

None of the above

Question 16 :-

Mass of proton is :- amu = Atomic Mass Unit

a:

1.000 amu

b:

0.9073 amu

c:

1.0073 amu

d:

5.486 x 10-4 amu

Question 17 :-

The mass number of the element is:

a:

Sum of the number of electrons and protons

b:

Sum of the number of protons and neutrons

c:

The number of neutrons

d:

The number of protons

Question 18 :-

The atomic number of an element is equal to:

a:

Number of neutrons

b:

Number of electrons

c:

Number of protons

d:

Number of neutrons + Number of protons

Question 19 :-

An alpha particle is also known as:

a:

Subatomic particle

b:

A unionized helium atom

c:

A neutral particle

d:

A doubly-charged helium ion

Question 20 :-

The octet rule is not valid for the molecule:

a:

CO₂

b:

H₂O

c:

O₂

d:

CO

EDS 16-04-2022

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