science test class 10 - Abacus, Vedic Math, Coding ,Abacus Books ,Abacus Training

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Class 10 Science 1-2-3

1 / 50

What causes tides on Earth?

Wind and ocean currents.

Rotation of the Earth.

Gravitational pull of the Moon and Sun.

2 / 50

Which element has the atomic number 8?

Oxygen

Nitrogen

Carbon

3 / 50

Which of the following is a noble gas?

Sodium

Neon

Chlorine

4 / 50

The periodic law states that the properties of elements are a periodic function of their:

Atomic mass

Atomic number

Electron affinity

5 / 50

What happens in an exothermic reaction?

Heat is released.

Heat is absorbed.

No heat change.

6 / 50

What is the product of the reaction: CaCO₃ → CaO + CO₂?

Calcium oxide and carbon dioxide.

Calcium and oxygen.

Calcium chloride.

7 / 50

What are the elements in Group 18 called?

Noble gases

Halogens

Alkali metals

8 / 50

What is a chemical reaction?

A process where substances transform into new substances.

A mixing of substances without change.

A physical change in state.

9 / 50

What is the gravitational force inside a hollow sphere?

Zero

Maximum at the center

Equal throughout

10 / 50

What is the balanced equation for the reaction: Al + O₂ → Al₂O₃?

4Al + 3O₂ → 2Al₂O₃

Al + O₂ → Al₂O₃

2Al + O₂ → Al₂O₃

11 / 50

Who formulated the Law of Universal Gravitation?

Isaac Newton

Albert Einstein

Galileo Galilei

12 / 50

What happens to atomic radius down a group?

It remains the same

It decreases

It increases

13 / 50

How does the value of 'g' change with altitude?

It remains the same

It decreases

It increases

14 / 50

What is the common property of alkali metals?

Inert and stable.

Non-metallic.

Highly reactive with water.

15 / 50

Which element is a lanthanide?

Cerium

Uranium

Argon

16 / 50

Which group contains transition metals?

s-block elements.

p-block elements.

d-block elements.

17 / 50

What is the effect of temperature on the rate of reaction?

Decreases with increase in temperature.

Increases with increase in temperature.

Remains the same.

18 / 50

What is an oxidation reaction?

Reaction involving the gain of oxygen.

Reaction involving gain of hydrogen.

Reaction involving loss of oxygen.

19 / 50

Which scientist arranged elements based on their increasing atomic mass?

Dmitri Mendeleev

Henry Moseley

Glenn Seaborg

20 / 50

What is the atomic mass of hydrogen?

2

1

4

21 / 50

What is a precipitate?

A soluble solid.

A gas formed in a reaction.

An insoluble solid formed in a reaction.

22 / 50

What is the common characteristic of elements in the same period?

Same number of electron shells

Same atomic number

Same chemical reactivity

23 / 50

What is a reduction reaction?

Reaction involving gain of oxygen.

Reaction involving the loss of oxygen.

Reaction involving loss of hydrogen.

24 / 50

What is a combination reaction?

A single substance breaks into two or more products.

Two or more substances combine to form a single product.

Two substances exchange ions.

25 / 50

What is the center of mass?

Point where mass is concentrated.

Point with no mass.

Point of maximum mass.

26 / 50

What is gravitational potential energy dependent on?

Height and mass of the object.

Velocity and mass of the object.

Color and shape of the object.

27 / 50

What is free fall?

Motion under the influence of gravity only.

Motion without any force.

Motion under any force.

28 / 50

How does mass affect gravitational pull?

Mass does not affect pull.

Greater the mass, stronger the pull.

Lesser the mass, stronger the pull.

29 / 50

What is the relation between mass and weight?

Weight = Mass/g

Weight = Mass × g

Weight = Mass × G

30 / 50

What happens to atomic radius across a period?

It remains the same

It decreases

It increases

31 / 50

What happens to ionization energy down a group?

It remains the same

It increases

It decreases

32 / 50

What happens to ionization energy across a period?

It increases

It remains the same

It decreases

33 / 50

What is the balanced equation for the combustion of methane (CH₄)?

CH₄ + 2O₂ → CO₂ + 2H₂O

CH₄ + 2O₂ → CO₂ + H₂

CH₄ + O₂ → CO + 2H₂O

34 / 50

What is the unit of mass?

Meter (m)

Newton (N)

Kilogram (kg)

35 / 50

Which factor does NOT affect the rate of a chemical reaction?

Temperature

Concentration of reactants

Color of reactants

36 / 50

What is the electron configuration of sodium (Na)?

1s² 2s² 2p⁶

1s² 2s² 2p⁶ 3s¹

1s² 2s² 2p⁶ 3s²

37 / 50

What is the electron configuration of chlorine (Cl)?

1s² 2s² 2p⁶ 3s¹

1s² 2s² 2p⁶ 3s² 3p⁵

1s² 2s² 2p⁶ 3s² 3p⁶

38 / 50

In the reaction 2H₂ + O₂ → 2H₂O, what is the ratio of hydrogen to water by volume?

2:01

2:02

1:01

39 / 50

What happens in an endothermic reaction?

No heat change.

Heat is absorbed.

Heat is released.

40 / 50

What is ionization energy?

Energy needed to split an atom.

Energy released when an atom gains an electron.

Energy required to remove an electron from an atom.

41 / 50

Elements in the same group of the periodic table have similar:

Atomic numbers

Physical states

Chemical properties

42 / 50

What is the first element of the periodic table?

Lithium

Helium

Hydrogen

43 / 50

What is the atomic number of carbon?

14

12

6

44 / 50

How many periods are there in the modern periodic table?

7

6

8

45 / 50

Which element is in Period 2, Group 16?

Sulfur

Oxygen

Selenium

46 / 50

What type of reaction is Fe + S → FeS?

Combination reaction.

Displacement reaction.

Decomposition reaction.

47 / 50

What is a double displacement reaction?

Combination of two elements.

Exchange of ions between two compounds.

Decomposition of a compound.

48 / 50

What is a black hole?

A region with extremely strong gravitational force.

A planet.

A star.

49 / 50

What is the trend in electronegativity across a period?

Remains the same.

Increases.

Decreases.

50 / 50

What is a catalyst?

Substance that is consumed in the reaction.

Substance that slows down a reaction.

Substance that speeds up a reaction without being consumed.

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