Younas Academy
Online Test Platform

Science MCQs

Practice multiple choice questions with instant feedback. Select an option to see if you're correct.

Total Questions
2100
Page 167 of 210
Previous Next
Question 1661 Easy

The atomic number identifies the?

A
Mass of the atom
B
Type of element
C
Number of shells
D
Valency
Question 1662 Easy

What is the mass number (A) of an atom?

A
Number of protons
B
Number of electrons
C
Protons + Neutrons
D
Protons + Electrons
Question 1663 Easy

If an atom has 6 protons and 6 neutrons what is its mass number?

A
6
B
12
C
18
D
24
Question 1664 Easy

How do you find the number of neutrons in an atom?

A
A + Z
B
A - Z
C
Z - A
D
A / Z
Question 1665 Easy

Oxygen has atomic number 8 and mass number 16. How many neutrons does it have?

A
8
B
16
C
24
D
32
Question 1666 Easy

The paths in which electrons revolve are called?

A
Nuclei
B
Clouds
C
Shells
D
Both a and b
Question 1667 Easy

What is the maximum number of electrons in the K-shell?

A
2
B
8
C
18
D
32
Question 1668 Easy

What is the maximum number of electrons in the L-shell?

A
2
B
8
C
18
D
32
Question 1669 Easy

What is the maximum number of electrons in the M-shell?

A
2
B
8
C
18
D
32
Question 1670 Easy

Atoms become stable when their outermost shell has?

A
2 electrons
B
8 electrons
C
2 or 8 electrons
D
18 electrons
Showing 1661-1670 of 2100 questions
165 166 167 168 169

Quick Stats

Total Questions 10900
easy 5797
medium 2983
hard 2120

Popular Subjects

Verbal Intelligence
5800
Science
2100
Islamic Studies
1000
English
900
Mathematics
800
Physics
200
Urdu
100
Intelligence
0
Non Verbal Intelligence
0
View All Subjects

Practice Tips

Time Management

Practice with time limits for better preparation

Review Mistakes

Always check explanations for wrong answers

Track Progress

Monitor your improvement across subjects

Quick Actions

Non-Verbal MCQs
Take Full Test
Create Account

Did You Know?

Practice Makes Perfect

Regular practice with MCQs can improve your test-taking speed and accuracy by up to 40%.

Active Recall

MCQs engage active recall, which is 50% more effective for long-term memory than passive reading.