50+ High School Science worksheets for 9th Class on Quizizz | Free ... - Free Printable

Let's solve each question step by step:

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Question 1: Type of rock formed when magma cools?

- Options:
- A. Igneous
- B. Limestone
- C. Metamorphic
- D. Sedimentary

Explanation:
- Igneous rocks are formed when magma (molten rock beneath the Earth's surface) or lava (molten rock on the surface) cools and solidifies.
- Limestone is a sedimentary rock formed from the accumulation of organic material and minerals in water.
- Metamorphic rocks are formed by the transformation of existing rocks under heat and pressure.
- Sedimentary rocks are formed by the deposition and compaction of sediments.

Since the question asks about the type of rock formed when magma cools, the correct answer is:

Answer: A. Igneous

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Question 2: Equation for Newton's Law

- Options:
- A. H=2MA
- B. M=2GH
- C. F=MG
- D. F=MA

Explanation:
- The equation that represents Newton's Second Law of Motion is:
\[
F = MA
\]
where:
- \( F \) is the force applied to an object,
- \( M \) is the mass of the object,
- \( A \) is the acceleration produced by the force.

The other options do not represent any of Newton's laws:
- \( H=2MA \) and \( M=2GH \) are not valid equations in physics.
- \( F=MG \) represents weight (\( W = mg \)), but it is not Newton's Second Law.

Thus, the correct answer is:

Answer: D. F=MA

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Question 3: How many of Newton's Laws are there?

- Options:
- A. 3
- B. 2
- C. 1
- D. 4

Explanation:
- Sir Isaac Newton formulated three fundamental laws of motion, which are:
1. First Law (Law of Inertia): An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.
2. Second Law: The acceleration of an object as produced by a net force is directly proportional to the magnitude of the net force, in the same direction as the net force, and inversely proportional to the mass of the object (\( F = MA \)).
3. Third Law: For every action, there is an equal and opposite reaction.

There are no more than three laws of motion attributed to Newton.

Answer: A. 3

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Question 4: The force that is exerted on every object on Earth?

- Options:
- A. Gravity
- B. Sunlight
- C. Wind
- D. Friction

Explanation:
- Gravity is the force of attraction between two masses. On Earth, gravity pulls all objects toward the center of the planet. This is why objects fall when dropped and why we stay grounded.
- Sunlight is electromagnetic radiation emitted by the Sun and does not directly exert a gravitational force on objects on Earth.
- Wind is the movement of air caused by differences in atmospheric pressure and is not a universal force acting on all objects.
- Friction is a resistive force that opposes motion between surfaces in contact, but it is not a universal force like gravity.

The force that acts on every object on Earth is gravity.

Answer: A. Gravity

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Question 5: Ohio’s state bird?

- Image Description: The image shows laboratory equipment, possibly hinting at a science-related context, but it does not provide direct information about Ohio's state bird.

Explanation:
- Ohio's state bird is the Northern Cardinal. This is a well-known fact about Ohio's state symbols.

Answer: Northern Cardinal

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Final Answers:

1. A. Igneous
2. D. F=MA
3. A. 3
4. A. Gravity
5. Northern Cardinal

Boxed Final Answer:
\[
\boxed{A, D, A, A, \text{Northern Cardinal}}
\]