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ACADIFY · FREE SCIENCE CHALLENGE

Class 9
Science.

Explore scientific reasoning through questions on motion, forces, gravitation, matter, atoms, and living organisms.

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Test your scientific thinking.

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🔬 10 Questions ⏱️ About 20 Minutes 🧠 Conceptual Challenge

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1. A car increases its velocity from 10 m/s to 25 m/s in 5 seconds. What is its acceleration?
2. A 4 kg object accelerates at 3 m/s². What net force acts on it?
3. An object is thrown vertically upwards. Ignoring air resistance, what happens to its velocity at the highest point?
4. Why does a passenger tend to move forward when a moving bus suddenly stops?
5. Two objects have masses of 2 kg and 6 kg. At the same location, what is the ratio of their weights, first object to second object?
6. A substance changes directly from solid to gas without becoming liquid first. What is this process called?
7. An atom has 11 protons, 12 neutrons, and 11 electrons. What are its atomic number and mass number, respectively?
8. Which cell structure controls most activities of a typical plant and animal cell and contains genetic material?
9. Why do gases diffuse faster than liquids under comparable conditions?
10. A student says, “An object moving at constant speed in a straight line must have a net force acting forward.” Which response is correct?

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