Practice Science with our Class 8 online mock tests, updated for CBSE 2026-27. Each one gives an instant score, so you can quickly see how your preparation is going.
Class 8 Science Tests, Chapter by Chapter
Each test below covers one Science chapter from the Class 8 book. Our teachers built these to match the CBSE 2026-27 marking scheme closely. Click a chapter to start - there's no login, and you can try a test as many times as you want.
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Class 8 Science (Curiosity): Concept Navigators & Chapter Diagnostic Tests Select any unit below to use live science simulators and practice diagnostic questions from the new NCERT Curiosity curriculum with verified explanations. Interactive Concept Tool: Microorganism & Disease Diagnostic Sorter Q1.Which bacterium promotes the coagulation of milk to form curd? Answer: (b) Lactobacillus. Lactobacillus multiplies in milk and converts lactose milk sugar into lactic acid, which coagulates milk proteins into curd.
Q2.What type of immunity is developed when dead or weakened microbes are introduced into a healthy body to stimulate antibody production? Answer: (c) Active immunity via Vaccination. Vaccines train the immune system's memory cells to produce targeted antibodies against future infections without causing the actual disease.
Q3.A balanced diet essential for adolescent growth must contain: Answer: (a). Adolescence requires a nutritionally diverse balanced diet including proteins for muscular growth, iron for blood formation, and vitamins/minerals for metabolic health.
Interactive Concept Tool: Pressure & Force Calculator ($P = F/A$) Q1.Why do heavy school bags feature broad shoulder straps rather than thin cords? Answer: (b). Pressure is inversely proportional to contact area ($P \propto 1/A$). A wider strap distributes the downward weight force over a larger area, reducing the pressure exerted on the shoulders.
Q2.What safety device protects domestic electrical circuits against sudden current surges by melting when overheated? Answer: (c) Electric Fuse wire. A fuse operates on the heating effect of electric current ($H = I^2Rt$). When current exceeds safe limits, the wire heats beyond its melting point and breaks the circuit.
Q3.High-speed winds blowing across the roof of a house cause a decrease in air pressure above the roof, which can lift light tin roofs due to: Answer: (a). Rapidly moving air creates a localized low-pressure zone above the roof, while standard higher atmospheric pressure beneath pushes upward, blowing the roof off.
Interactive Concept Tool: Elements, Compounds & Solution Concentration Sorter Q1.Why is water ($\text{H}_2\text{O}$) classified as a chemical compound rather than a mixture? Answer: (b). Compounds consist of elements bonded in fixed proportions by mass, displaying properties entirely distinct from their constituent elements (water extinguishes fire, though hydrogen burns and oxygen supports combustion).
Q2.What happens to the solubility of most solid solutes (such as sugar or copper sulphate) in water when temperature is increased? Answer: (a) Solubility increases. Heating increases the kinetic energy and intermolecular spacing of water molecules, allowing more solid solute to dissolve.
Q3.The spontaneous intermingling and spreading of particles of one substance into another due to their continuous motion is called: Answer: (c) Diffusion. Diffusion is fastest in gases and slowest in solids, driven by the random thermal motion of particles.
Interactive Concept Tool: Mirrors, Lenses & Ray Behavior Navigator Q1.Why are convex mirrors preferred as side rear-view mirrors in automobiles? Answer: (b). Being curved outwards, convex mirrors provide a wider field of view and always produce erect, diminished images of vehicles behind.
Q2.The Pole Star (Dhruva Tara) appears stationary in the night sky because it lies directly along: Answer: (a). Because the Pole Star is aligned with the Earth's northern axis of rotation, its apparent position remains fixed while other stars appear to rotate from east to west.
Q3.What makes planet Earth unique in supporting biological life compared to neighboring planets? Answer: (c). Earth orbits within the habitable 'Goldilocks zone', enabling moderate temperatures, liquid oceans, an oxygen-nitrogen atmosphere, and magnetic shields that safeguard life.
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| Chapter 01 Exploring The Investigative World Of Science Mock Test Set 01 |
| Chapter 01 Exploring The Investigative World Of Science Mock Test Set 02 |
| Chapter 01 Exploring The Investigative World Of Science Mock Test Set 03 |
| Chapter 02 The Invisible Living World Beyond Our Naked Eye Mock Test Set 01 |
| Chapter 02 The Invisible Living World Beyond Our Naked Eye Mock Test Set 02 |
| Chapter 02 The Invisible Living World Beyond Our Naked Eye Mock Test Set 03 |
| Chapter 03 Health The Ultimate Treasure Mock Test Set 01 |
| Chapter 03 Health The Ultimate Treasure Mock Test Set 02 |
| Chapter 03 Health The Ultimate Treasure Mock Test Set 03 |
| Chapter 04 Electricity Magnetic And Heating Effects Mock Test Set 01 |
| Chapter 04 Electricity Magnetic And Heating Effects Mock Test Set 02 |
| Chapter 04 Electricity Magnetic And Heating Effects Mock Test Set 03 |
| Chapter 05 Exploring Forces Mock Test Set 01 |
| Chapter 05 Exploring Forces Mock Test Set 02 |
| Chapter 05 Exploring Forces Mock Test Set 03 |
| Chapter 06 Pressure, Winds, Storms, And Cyclones Mock Test Set 01 |
| Chapter 06 Pressure, Winds, Storms, And Cyclones Mock Test Set 02 |
| Chapter 06 Pressure, Winds, Storms, And Cyclones Mock Test Set 03 |
| Chapter 07 Particulate Nature Of Matter Mock Test Set 01 |
| Chapter 07 Particulate Nature Of Matter Mock Test Set 02 |
| Chapter 07 Particulate Nature Of Matter Mock Test Set 03 |
| Chapter 08 Nature Of Matter Elements, Compounds, And Mixtures Mock Test Set 01 |
| Chapter 08 Nature Of Matter Elements, Compounds, And Mixtures Mock Test Set 02 |
| Chapter 08 Nature Of Matter Elements, Compounds, And Mixtures Mock Test Set 03 |
| Chapter 09 The Amazing World Of Solutes, Solvents, And Solutions Mock Test Set 01 |
| Chapter 09 The Amazing World Of Solutes, Solvents, And Solutions Mock Test Set 02 |
| Chapter 09 The Amazing World Of Solutes, Solvents, And Solutions Mock Test Set 03 |
| Chapter 10 Light Mirrors And Lenses Mock Test Set 01 |
| Chapter 10 Light Mirrors And Lenses Mock Test Set 02 |
| Chapter 10 Light Mirrors And Lenses Mock Test Set 03 |
| Chapter 13 Our Home Earth, A Unique Life Sustaining Planet Mock Test Set 01 |
| Chapter 13 Our Home Earth, A Unique Life Sustaining Planet Mock Test Set 02 |
| Chapter 13 Our Home Earth, A Unique Life Sustaining Planet Mock Test Set 03 |
Free study material for Science
FAQs
You can start the latest Science mock tests for Class 8 by selecting your chapter from the links above. These tests are free, dont need login and are optimized for the 2026-27 academic session.
Yes, our Science online tests are strictly as per the latest CBSE pattern with 20% MCQ weightage and main focus on competency-based and case-study questions.
After submitting your Class 8 Science test, you can see score report and correct/incorrect answers.
There are no limits. You can re-attempt any Science online test as many times for free, master concepts, improve your speed and accuracy.
Yes, the StudiesToday online test platform is mobile-first. Class 8 Science students can take these tests on any smartphone.
Online tests help Class 8 students build confidence and time management. By solving above tests MCQs you can apply theoretical knowledge which is important for 2026-27 exams.