- Question of
What is the basic functionality of the pulleys?
- To reduce the friction force.
- To reduce the pressure on a body.
- To lift weights.
- Question of
The intensity of the sound refers to the volume with which we perceive it in the ear.
- True
- False
- Question of
The scientist Hans Oersted intuited the relationship between electricity and magnetism.
- True
- False
- Question of
What instrument did Hans Oersted use for his famous experiment?
- A clock.
- A compass.
- Question of
During this discovery, when an electric current passed near a compass the needle moved.
- True.
- False, the electric current stopped.
- Question of
Which instrument is an example of a third class lever?
- Screw
- Nutcracker
- Tweezers
- Question of
When the applied force is between the point of support and the resistance we are talking about…
- A second class lever.
- A third class lever.
- Question of
What are the names of objects that let light through, but do not allow objects to be seen clearly?
- Refracting
- Translucent
- Opaque
- Question of
Fluid machines get their energy from water or wind.
- True.
- False, only from water.
- Question of
Which of the following examples of a simple machine is not based on the properties of an inclined plane?
- Ramp
- Screw
- Swing
- Question of
The Earth works like a magnet, because inside it there are metals in motion, among which two stand out, select them.
- Nickel and mercury.
- Iron and nickel.
- Cobalt and copper.
- Question of
Select the characteristic that does NOT correspond to noise pollution.
- It is a very cheap pollution to produce.
- It does not generate waste in the environment.
- The damage is temporary and ends when the noise stops.
- Question of
When the resistance is between the point of support and the applied force we talk about…
- A second class lever.
- A third class lever.
- A fifth class lever.
- Question of
Select the example of a second class lever.
- Screw
- Nutcracker
- Hammer
- Question of
More than 2000 years ago, what was the first iron ore known to man as a natural magnet?
- Magnetite
- Magnesite
- Pyrite
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