Ace Your Science 10th Exam: Top Objective Questions

Nov 13, 2025 by Alex Braham 52 views

Hey guys! Getting ready for your 10th-grade science exam? Feeling a bit stressed about those objective questions? Don't worry, I've got your back! This guide is packed with essential objective questions that will help you nail your exam. We'll break down everything you need to know, making sure you're confident and ready to ace it. Let's dive in!

Why Objective Questions Matter

Objective questions, like multiple-choice, true/false, and fill-in-the-blanks, are a huge part of most science exams. They test your understanding of key concepts, definitions, and formulas. Mastering these types of questions is crucial for scoring high marks. They might seem straightforward, but they require a solid grasp of the fundamentals. So, let's make sure you're totally prepared!

Key Concepts Covered

Before we jump into the questions, let's quickly recap the main areas you'll likely encounter in your 10th-grade science syllabus. These generally include:

Chemical Reactions: Balancing equations, types of reactions (combination, decomposition, displacement, etc.), oxidation and reduction.
Acids, Bases, and Salts: pH scale, neutralization reactions, properties of acids and bases.
Metals and Non-metals: Properties, reactivity series, extraction of metals.
Carbon Compounds: Nomenclature, functional groups, hydrocarbons.
Life Processes: Nutrition, respiration, transportation, excretion in plants and animals.
Control and Coordination: Nervous system, endocrine system in animals, plant hormones.
Heredity and Evolution: Mendel's laws, chromosomes, DNA, evolution theories.
Light: Reflection, refraction, lenses, human eye.
Electricity: Ohm's law, electric current, potential difference, electric circuits.
Magnetic Effects of Electric Current: Magnetic fields, electromagnetic induction.
Sources of Energy: Renewable and non-renewable sources.
Our Environment: Ecosystems, pollution, ozone depletion.

Practice Questions to Sharpen Your Skills

Alright, let's get down to business! Here's a collection of objective questions covering various topics from your 10th-grade science curriculum. Work through these questions carefully, and don't hesitate to review the concepts if you get stuck. Remember, practice makes perfect!

Chemical Reactions and Equations

Chemical reactions are the foundation of chemistry, and understanding them is essential. These questions will test your knowledge of balancing equations, identifying types of reactions, and understanding redox reactions.

Question 1: Which of the following is a balanced chemical equation?

(a) H2 + O2 → H2O

(b) 2H2 + O2 → 2H2O

(d) 2H2 + 2O2 → H2O

Answer: (b) 2H2 + O2 → 2H2O

Question 2: The reaction between an acid and a base is called:

(a) Oxidation

(b) Reduction

(d) Displacement

Answer: (c) Neutralization

Question 3: In the reaction CuO + H2 → Cu + H2O, which substance is being reduced?

(a) CuO

(b) H2

(d) H2O

Answer: (a) CuO

Acids, Bases, and Salts

Acids, bases, and salts play crucial roles in everyday life and in various industrial processes. These questions will help you understand their properties, pH values, and reactions.

Question 1: The pH of a neutral solution is:

(a) 0

(b) 7

(d) 1

Answer: (b) 7

Question 2: Which of the following is a strong acid?

(a) Acetic acid

(b) Citric acid

(d) Carbonic acid

Answer: (c) Hydrochloric acid

Question 3: Baking soda is chemically known as:

(a) Sodium chloride

(b) Sodium carbonate

(d) Calcium hydroxide

Answer: (c) Sodium bicarbonate

Metals and Non-metals

Metals and non-metals have distinct properties and uses. These questions will test your understanding of their characteristics, reactivity, and extraction processes.

Question 1: Which of the following metals is the most reactive?

(a) Iron

(b) Copper

(d) Silver

Answer: (c) Potassium

Question 2: The process of coating iron with zinc to prevent corrosion is called:

(a) Alloying

(b) Galvanization

(d) Smelting

Answer: (b) Galvanization

Question 3: Which of the following is a non-metal that is liquid at room temperature?

(a) Carbon

(b) Sulfur

(d) Phosphorus

Answer: (c) Bromine

Carbon Compounds

Carbon compounds are the backbone of organic chemistry. These questions will assess your knowledge of nomenclature, functional groups, and hydrocarbons.

Question 1: The general formula for alkanes is:

(a) CnH2n

(b) CnH2n+2

(d) CnHn

Answer: (b) CnH2n+2

Question 2: The functional group present in alcohols is:

(a) -CHO

(b) -COOH

(d) -CO-

Answer: (c) -OH

Question 3: Which of the following is an unsaturated hydrocarbon?

(a) Methane

(b) Ethane

(d) Propane

Answer: (c) Ethene

Life Processes

Understanding life processes is fundamental to biology. These questions will cover nutrition, respiration, transportation, and excretion in plants and animals.

Question 1: The process by which plants make their own food is called:

(a) Respiration

(b) Photosynthesis

(d) Digestion

Answer: (b) Photosynthesis

Question 2: Which of the following is the main respiratory pigment in humans?

(a) Chlorophyll

(b) Hemoglobin

(d) Bile

Answer: (b) Hemoglobin

Question 3: The excretion of nitrogenous waste products occurs through which organ in humans?

(a) Lungs

(b) Liver

(d) Skin

Answer: (c) Kidneys

Control and Coordination

Control and coordination mechanisms ensure the proper functioning of the body. These questions will cover the nervous and endocrine systems in animals and plant hormones.

Question 1: The part of the brain that controls voluntary actions is:

(a) Cerebellum

(b) Medulla

(d) Spinal cord

Answer: (c) Cerebrum

Question 2: Which hormone is responsible for the development of secondary sexual characteristics in females?

(a) Testosterone

(b) Estrogen

(d) Adrenaline

Answer: (b) Estrogen

Question 3: Which plant hormone promotes cell elongation?

(a) Auxin

(b) Gibberellin

(d) Abscisic acid

Answer: (a) Auxin

Heredity and Evolution

Heredity and evolution explain how traits are passed down and how species change over time. These questions will cover Mendel's laws, chromosomes, DNA, and evolution theories.

Question 1: The units of heredity are called:

(a) Cells

(b) Tissues

(d) Organs

Answer: (c) Genes

Question 2: Who proposed the theory of evolution by natural selection?

(a) Gregor Mendel

(b) Charles Darwin

(d) Robert Hooke

Answer: (b) Charles Darwin

Question 3: DNA is primarily found in the:

(a) Cytoplasm

(b) Ribosomes

(d) Golgi apparatus

Answer: (c) Nucleus

Light

Light is a crucial part of our physical world. These questions cover the reflection, refraction, lenses, and human eye topics.

Question 1: The angle of incidence is equal to the angle of reflection in:

(a) Refraction

(b) Diffraction

(d) Dispersion

Answer: (c) Reflection

Question 2: The lens used to correct myopia is:

(a) Convex lens

(b) Concave lens

(d) Bifocal lens

Answer: (b) Concave lens

Question 3: The part of the eye that controls the amount of light entering is the:

(a) Retina

(b) Cornea

(d) Lens

Answer: (c) Iris

Electricity

These questions on electricity will cover Ohm's law, electric current, potential difference, and electric circuits.

Question 1: Ohm's law states that:

(a) V = IR

(b) V = I/R

(d) V = I + R

Answer: (a) V = IR

Question 2: The unit of electric current is:

(a) Volt

(b) Ohm

(d) Watt

Answer: (c) Ampere

Question 3: The device used to measure electric potential difference is:

(a) Ammeter

(b) Voltmeter

(d) Rheostat

Answer: (b) Voltmeter

Magnetic Effects of Electric Current

Questions on magnetic effects of electric current will cover magnetic fields and electromagnetic induction.

Question 1: A magnetic field is produced by:

(a) A stationary charge

(b) A moving charge

(d) An uncharged body

Answer: (b) A moving charge

Question 2: The phenomenon of inducing a current in a coil due to a changing magnetic field is called:

(a) Electric induction

(b) Magnetic induction

(d) Static electricity

Answer: (c) Electromagnetic induction

Question 3: The direction of the induced current is given by:

(a) Ohm's law

(b) Fleming's left-hand rule

(d) Joule's law

Answer: (c) Fleming's right-hand rule

Sources of Energy

The following questions covers renewable and non-renewable sources.

Question 1: Which of the following is a renewable source of energy?

(a) Coal

(b) Petroleum

(d) Solar energy

Answer: (d) Solar energy

Question 2: The primary source of energy for the Earth is:

(a) The moon

(b) The sun

(d) Nuclear energy

Answer: (b) The sun

Question 3: Which of the following is a non-renewable source of energy?

(a) Wind energy

(b) Hydropower

(d) Tidal energy

Answer: (c) Fossil fuels

Our Environment

These questions address ecosystems, pollution, and ozone depletion.

Question 1: The layer of the atmosphere that protects us from harmful UV radiation is:

(a) Troposphere

(b) Stratosphere

(d) Thermosphere

Answer: (b) Stratosphere

Question 2: Which of the following is a greenhouse gas?

(a) Oxygen

(b) Nitrogen

(d) Hydrogen

Answer: (c) Carbon dioxide

Question 3: An ecosystem consists of:

(a) Only biotic components

(b) Only abiotic components

(d) Only producers

Answer: (c) Both biotic and abiotic components

Tips for Success

Understand the Concepts: Don't just memorize answers. Make sure you really understand the underlying concepts.
Practice Regularly: The more you practice, the more confident you'll become.
Review Your Mistakes: Pay close attention to the questions you get wrong and learn from your errors.
Manage Your Time: During the exam, allocate your time wisely and don't spend too long on any single question.
Stay Calm: Take deep breaths and try to relax. A calm mind is a clear mind.

Conclusion

So there you have it, guys! A comprehensive guide to objective questions for your 10th-grade science exam. By understanding the key concepts and practicing regularly, you'll be well-prepared to ace your exam. Good luck, and remember to stay focused and confident. You've got this!

Disclaimer: This guide is intended for educational purposes only. Always refer to your textbook and classroom notes for the most accurate and up-to-date information.