Exsam 2

Question 0

All electrons are attracted to?

Answer 0

Protons

Question 1

What is the charge of an electron?

Answer 1

Negative

Question 2

If an atom or object losers electronIs, it becomes?

Answer 2

Positively charged

Question 3

An electric current is made up of?

Answer 3

Electrons moving towards a place that is positively charged.

Question 4

For an electric current to flow, what two systems are necessary?

Answer 4

A difference in charge between two object or places.

A path for the current to fall through.

Question 5

Materials which allow an electrical current to easily flow through them are called?

Answer 5

Conductors

Question 6

To keep an electric current in its pathway, the material through which it flows is surrounded by an?

Answer 6

Insulator

Question 7

If there are no breaks in an electrical circuit, it is said to be be?

Answer 7

Closed

Question 8

In a parallel circuit if one appliance it tuned off, what happens to the other appliances on the circuit?

Answer 8

The other appliances will not be affected

Question 9

What is the major danger of a short circuit?

Answer 9

To much current may over heart the electrical wires and cause a fire

Question 10

What affects the amount of current which flows through a circuit?

Answer 10

The electromotive force which makes the current flow through a path.
The resistance to the flow of electrons through the path.

Question 11

What measures the flow of electric current through a circuit?

Answer 11

Amperes

Question 12

What measures the resistance to the flow of electric current through a circuit?

Answer 12

Ohms

Question 13

What measures the electromotive force which makes the current flow through a circuit?

Answer 13

Volts

Question 14

What measures the power used by appliances?

Answer 14

Watts

Question 15

Does a long, thin wire have grater resistance than a short m, think wire?

Answer 15

Yes

Question 16

An increase in the resistance of a circuit reduces?

Answer 16

The current flow

Question 17

Does an increase in the voltage in a circuit reduce the current flow?

Answer 17

No

Question 18

Does a 75 watt light bulb uses more power than a 40 watt light bulb

Answer 18

Yes

Question 19

Are both wet and dry cells change chemical energy into electrical energy?

Answer 19

Yes.

Question 20

the electrode that electrons move towards in a wet it dry cell is call the?

Answer 20

Positive electrode

Question 21

In order for a dry cell to supply current, its inmates must be kept dry?

Answer 21

No

Question 22

When electric current flows through a wire, it creates a magnetic field around the wire.

Answer 22

True

Question 23

Does a generator changes electrical energy into a mechanical energy?

Answer 23

No

Question 24

Current which flows in one direction is called?

Answer 24

Direct current

Question 25

Does a generator produce direct current?

Answer 25

No

Question 26

Work is done when what kinda energy is changed into the energy of motion?

Answer 26

Potential.

Question 27

A child pulling a wagon down the street (is or is not) doing work.

Answer 27

Is.

Question 28

The push or pull which starts or stops motion is called?

Answer 28

Force

Question 29

Machines help make work easier by transferring or changing the direction of?

Answer 29

Force

Question 30

A machine can save?

Answer 30

Effort

Question 31

The ratio of useful work to the total work done by a machine is called?

Answer 31

Work load

Question 32

The efficiency of a machine is reduced by?

Answer 32

Friction

Question 33

A gasoline engine is more or less efficient than a turbine?

Answer 33

Less

Question 34

Bicycles are an example of what kinda machines?

Answer 34

Complex

Question 35

Solar energy (is or is not) difficult to store?

Answer 35

Is

Question 36

Water energy is harnessed by?

Answer 36

Turbines

Question 37

Do Internal combustion engines run on exploding gas?

Answer 37

Yes

Question 38

Under certain conditions, matter can be changed into energy, and energy changes In to?

Answer 38

Matter

Question 39

The nuclear reaction in which energy is released by the splitting of nuclei of heavy atoms is called?

Answer 39

fusion

Question 40

In atomic fission, crew chain reaction occurs because of?

Answer 40

fast moving neutrons

Question 41

Nuclear reactors currently obtain what energy from?

Answer 41

fission

Question 42

Fission is the nuclear reaction which uses the least expensive materials and produces the least amount of radioactive by- products?

Answer 42

False

Question 43

A centimeter is used to measure?

Answer 43

Length

Question 44

A kilogram is used to measure?

Answer 44

Weight

Question 45

The abbreviation g stands for?

Answer 45

Gram

Question 46

The abbreviation cm stands for?

Answer 46

Centimeter

Question 47

A liter a larger than a?

Answer 47

Milliliter

Question 48

A kilometer is larger than?

Answer 48

A meter & a millimeter

Question 49

A gram is smaller than?

Answer 49

Kilogram

Question 50

20 kilometers equals how many kilograms?

Answer 50

20,000

Question 51

6000 grams equals how many kilograms?

Answer 51

6