The principles of force in physics is amply demonstrated in various walk of life. So , selected
multiple choice questions given below will not only test your knowledge on physics , but also add to your already high knowledge in the field of physics , specially on the topic of force.
CBSE-Class VII-Science-Chemistry
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Question 1 |
The formula for Hydrogen is H2 . Then H2 is ............
molecule | |
atom | |
electron |
Question 1 Explanation:
Two atoms of Hydrogen combines to form one molecule of Hydrogen represented as H2
Question 2 |
Which one of these is monoatomic gas?
Hydrogen | |
Helium | |
Ozone | |
Oxygen |
Question 2 Explanation:
Monoatomic gas has one one atom . These are
He (Helium) , Ar (Argon), Kr( Krypton) and Xe(Xenon).
Ozone is triatomic gas because of presence of 3 atoms to form molecule of Ozone i.e O3
Question 3 |
One atom of Chlonie combines with one atom of Hydrogen to form HCL. Similarly, one atom of Nitrogen combines with three atoms of Hydrogen to form amonia represented as NH3. Whose valency s more - Nitrogen or Chlorine ???
Nitrogen | |
Chlorine |
Question 3 Explanation:
The valency is the capacity of an atom to combine with other atoms of different elements.
Question 4 |
If an element A has valency Y and element B has valency X , in that case if both element combines, the formula for the resultant element will be ...
AxBy | |
AyBx |
Question 4 Explanation:
H2O means , valancy of Oxygen is 2 and Hydrogen is 1.
Question 5 |
Which one of the following is variable valency ?
Iron | |
Cholorine | |
Nitrogen | |
Sodium |
Question 5 Explanation:
Other variable valency elements are
Copper 1 & 2
Iron 2, & 3
Tin 2 & 4
Lead 2 & 4
Question 6 |
Which of the following is symbol of gold?
Au | |
Pb | |
Ag | |
Gd |
Question 7 |
How many atoms are generally lost in a chemical reactions ??
0 | |
1 | |
2 | |
3 |
Question 8 |
What is compound radicals?
The compound which is very radical in nature | |
The compound in which atoms of different element remain together | |
The compounded which burns | |
Acidic compunds |
Question 8 Explanation:
Radical compounds are NO3 or OH
Question 9 |
A compound that has three elements , out of which one is surely metal is called
Ternary Ionic Compound | |
Binary Ionic Compund | |
Binary Molecular Compound | |
Inorganic Compound |
Question 10 |
A simple acid will always have .................
Hydrogen | |
Oxygen | |
Chlorine | |
Nitrogen |
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There are 10 questions to complete.
