CBSE 10 Science Question Paper-2020 Set-1 by Pavan | Practice Test to Test Your Knowledge
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  3. CBSE 10 Science Question Paper-2020 Set-1
CBSE 10 Science Question Paper-2020 Set-1

CBSE 10 Science Question Paper-2020 Set-1

This mock test includes actual CBSE Class 10 Science board exam questions from the year 2020 Set 1, helping students understand exam trends and practice real paper formats.

2025-07-28
Pavan Pavan
CBSE Class 10 Science Grade 10 2020

Duration

30 min

Questions

30

Marking

Negative

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Questions Preview

What is electropositivity?

A
The ability of an atom to gain electrons
B
The ability of an atom to lose electrons
C
The ability of an atom to share electrons
D
The ability of an atom to form ionic bonds

How does the atomic radii of Group-I elements change down the group?

A
Atomic radii decrease down the group
B
Atomic radii remain constant down the group
C
Atomic radii increase down the group
D
Atomic radii first increase, then decrease down the group

How are covalent bonds formed?

A
When atoms share electrons
B
When atoms lose electrons
C
When atoms transfer electrons
D
When atoms form ionic bonds

What happens to the atomic radii as you move down Group-I elements?

A
They decrease due to increased nuclear charge.
B
They remain constant across the group.
C
They increase due to increased electron shells.
D
They fluctuate with temperature changes.

Which of the following elements has the highest electropositivity?

A
Na (Sodium)
B
K (Potassium)
C
Ca (Calcium)
D
Cs (Cesium)

What is the main characteristic of a covalent bond?

A
Sharing of electrons between atoms
B
Transfer of electrons from one atom to another
C
Formation of positive and negative ions
D
None of the above

Which of the following statements is true about the atomic radius of elements down the group?

A
It decreases as more shells are added.
B
It increases as you move down the group.
C
It stays the same across all groups.
D
It fluctuates depending on the atomic number.

What is electropositivity?

A
The ability of an atom to gain electrons.
B
The ability of an atom to lose electrons.
C
The ability of an atom to share electrons.
D
The ability of an atom to form covalent bonds.

What type of bond is formed when electrons are transferred from one atom to another?

A
Covalent bond
B
Ionic bond
C
Metallic bond
D
Hydrogen bond

Which of the following elements is most likely to form an anion?

A
Sodium (Na)
B
Chlorine (Cl)
C
Magnesium (Mg)
D
Calcium (Ca)

Which of the following is a property of ionic compounds?

A
Low melting point
B
Good conductors of electricity in solid form
C
High melting point
D
None of the above

What is the main factor responsible for the periodic trends in the periodic table?

A
Atomic number
B
Electron configuration
C
Electron shielding
D
Number of protons

Which of the following is a noble gas?

A
Oxygen
B
Neon
C
Chlorine
D
Sodium

Which of the following is true for metals?

A
They have high ionization energy
B
They are poor conductors of heat
C
They can lose electrons easily
D
They tend to form negative ions

Which of the following is a characteristic of covalent bonds?

A
They occur between metals and nonmetals.
B
They involve the sharing of electrons.
C
They always form solid compounds.
D
They involve the transfer of electrons.

Which of the following is true for ionic bonds?

A
Ionic bonds involve the sharing of electrons.
B
Ionic bonds occur between two nonmetals.
C
Ionic bonds occur between metals and nonmetals.
D
Ionic bonds are formed by the transfer of protons.

Which element is known as the most electronegative element?

A
Fluorine
B
Oxygen
C
Nitrogen
D
Chlorine

Which of the following is NOT a characteristic of metals?

A
They are ductile.
B
They are good conductors of heat.
C
They are poor conductors of electricity.
D
They have high melting points.

Which of the following is a property of alkali metals?

A
They are highly reactive with water.
B
They are non-metals.
C
They are poor conductors of electricity.
D
They have low reactivity with oxygen.

Which of the following is a property of alkali metals?

A
They are highly reactive with water.
B
They are non-metals.
C
They are poor conductors of electricity.
D
They have low reactivity with oxygen.

What is the electron configuration of Sodium (Na)?

A
1s² 2s² 2p⁶ 3s²
B
1s² 2s² 2p⁶ 3s¹
C
1s² 2s² 2p⁶ 3p⁶
D
1s² 2s² 2p⁶

What is the most common charge of an alkali metal ion?

A
1+
B
2+
C
1-
D
2-

Which of the following elements is the most reactive?

A
Sodium (Na)
B
Potassium (K)
C
Cesium (Cs)
D
Lithium (Li)

Which of the following compounds is an ionic compound?

A
H₂O
B
NaCl
C
CO₂
D
O₂

What is the formula for potassium chloride?

A
KCl₂
B
KCl
C
K₂Cl
D
K₂Cl₂

Which of the following compounds has the highest melting point?

A
NaCl
B
KCl
C
LiCl
D
CsCl

Which of the following is an example of a covalent compound?

A
NaCl
B
CO₂
C
K₂O
D
MgCl₂

What is the main property that distinguishes ionic compounds from covalent compounds?

A
Ionic compounds have high melting points, while covalent compounds have low melting points.
B
Ionic compounds are poor conductors, while covalent compounds are good conductors.
C
Ionic compounds form non-polar bonds, while covalent compounds form polar bonds.
D
Ionic compounds are formed by the sharing of electrons, while covalent compounds are formed by the transfer of electrons.

Which of the following elements has the highest electronegativity?

A
Fluorine
B
Oxygen
C
Nitrogen
D
Chlorine

What is the most common oxidation state of alkali metals?

A
0
B
1+
C
2+
D
3+