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Forces, energy, and the laws of the universe.
1. What force pulls objects toward the Earth?
- Tension
- Magnetism
- Gravity
- Friction
Gravity is the attractive force between masses, giving objects weight.
2. What is the speed of light in a vacuum (approx.)?
- 30,000 km/s
- 300,000 km/s
- 3,000 km/s
- 3 million km/s
Light travels at about 299,792 km per second in a vacuum.
3. Which scientist proposed the theory of general relativity?
- Isaac Newton
- Niels Bohr
- Albert Einstein
- Galileo Galilei
Einstein published general relativity in 1915.
4. What unit measures electrical resistance?
- Ampere
- Watt
- Volt
- Ohm
Resistance is measured in ohms (Ω).
5. What state of matter has a definite volume but no definite shape?
- Liquid
- Plasma
- Solid
- Gas
Liquids take the shape of their container while keeping a fixed volume.
6. Who formulated the three laws of motion?
- Isaac Newton
- Albert Einstein
- James Watt
- Michael Faraday
Newton's laws of motion were published in 1687.
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