Physics Exam - 8 grade - 3 trimester - 2 midterm

Question 1

Circuit:

Answer 1

Is a route through which electrical current can flow.

Question 2

How do electrons flow?

Answer 2

They flow from the negative points of the battery to the positive.

Question 3

Magnetism:

Answer 3

is the set of phenomena related with magnets and magnetic materials.

Question 4

Depending on the origin magnets can be:

Answer 4

Naturally occurring and manmade.

Question 5

Examples of naturally ocurring magnets are:

Answer 5

Iron, nickel, cobalt, titanium oxide.

Question 6

Examples of manmade magnets are:

Answer 6

Materials that when they interact with strong magnets or electromagnetic current become magnets.

Question 7

What is a magnetic field?

Answer 7

Is the disturbance generated by a magnet in a region in space

Question 8

Electromagnetism:

Answer 8

Is the field of study that merges electric phenomena and magnetic
phenomena in a single theory.

Question 9

Examples of Electromagnetic machines are:

Answer 9

Solenoids, Electromagnets, Electric Motors, Dynamos.

Question 10

Solenoid:

Answer 10

Is a coil of current-carrying wire.

Question 11

Electromagnet:

Answer 11

Is a solenoid with a coil made of magnetic material such as iron. The magnetic field becomes stronger.

Question 12

An electric motor transforms electrical energy into:

Answer 12

Mechanical energy. It has external magnets.

Question 13

Dynamo:

Answer 13

Is a machine that transforms mechanical energy into electrical energy.

Question 14

Electric power plant:

Answer 14

Is an industrial facility which produces electrical energy.

Question 15

Nucelar Plants:

Answer 15

Nuclear reactions are used to heat water and produce steam. Energy yield from this plants is high. It is non-renewable. Produces wastes.

Question 16

Fossil Fuel Power Plant:

Answer 16

It is a plant that burns fossil fuels such as gas and coal to heat water.
Energy yield from this plants is low. It is nonrenewable. Pollutes the environment.

Question 17

Geothermal Power Plant:

Answer 17

Water is heated using the Earth’s inner heat. Energy yield of these
plants is low. It is renewable and No wastes are produced.

Question 18

Hydroelectric Plant:

Answer 18

In rivers or dams masses of water falling through step vertical distances move the generators. Energy yield is high, doesn´t pollute, and no wastes are produced.

Question 19

Tidal Power Plant:

Answer 19

Uses the energy of waves or tides. Energy is high, renewable and doesn´t pollute.

Question 20

Wind Energy Plant:

Answer 20

Energy of wind is used to drive the turbines in electrical generators. Energy yield is low, renewable and doesn´t pollute.

Question 21

Solar Power Plant:

Answer 21

Solar radiation is used to heat water. Energy yield is low. It is renewable and doesn´t pollute.

Question 22

Renewable Energy:

Answer 22

It is energy that comes from natural sources that never run out and can be used over and over for example: sunlight, wind, tides, stored water, Earth’s heat, and biomass.

Question 23

Non-renewable Energy:

Answer 23

It is energy that comes from sources that will run out for example: fossil
fuels, coal, petroleum, and natural gas.

Question 24

The Solar System consist of:

Answer 24

The sun, planets, moons, asteroids, meteors, dust, gases, and primarily empty space.

Question 25

The Sun is made of:

Answer 25

Hydrogen and helium. It is a star that doesn´t have a solid surface, but is a ball of gas held together by its own gravity.

Question 26

Solar Flares from the sun are:

Answer 26

Sudden burst of radiation coming from the release of magnetic
energy associated with sunspots.

Question 27

The 8 planets in our solar system:

Answer 27

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune.

Question 28

The inner planets are also called:

Answer 28

Terrestrial Planets because they are dense and rocky.