QUESTION 15 When electric charges are in motion, we have: a voltage. a battery.

Question

QUESTION 15

When electric charges are in motion, we have:

a voltage.

a battery.

a wire.

an electric current.

4 points   

QUESTION 16

An electric motor does which of the following?

Converts heat into electrical energy and mechanical energy.

Converts mechanical energy into electrical energy and heat.

Converts electrical energy and heat into mechanical energy.

Converts electrical energy to mechanical energy and heat.

4 points   

QUESTION 17

One significant difference between matter waves (such as earthquakes and sound waves and water waves) and electromagnetic waves is which of the following?

Matter waves happen on larger scales.

Electromagnetic waves don’t have detectable effects.

Electromagnetic waves can travel through nothing at all.

Matter waves involve some type of up-and-down motion.

4 points   

QUESTION 18

The nature of an electromagnetic wave is that:

the electric field is parallel to the magnetic field and both are perpendicular to the direction of propagation.

the electric field is perpendicular to the magnetic field and both are perpendicular to the direction of propagation.

the electric and magnetic fields are parallel to each other and to the direction of propagation.

the electric and magnetic fields are perpendicular to each other and the electric field is parallel to the direction of propagation.

4 points   

QUESTION 19

The most energetic kind of electromagnetic radiation is which of the following?

Infrared waves

Microwaves

Gamma rays

X-rays

4 points   

QUESTION 20

If you use an electrical current to break down water, you get what two gases?

hydrogen and oxygen

carbon and dioxide

carbon and oxygen

hydrogen and carbon

4 points   

QUESTION 21

How is the organization of the Periodic Table of Elements related to the number of electrons in the outermost shell of atoms?

Within a given row, all electrons are within the same shell.

The electrons within elements in the leftmost column fill the lowest energy shells.

A different column in the Periodic Table corresponds to a different shell.

A different row in the Periodic Table corresponds to a different shell.

4 points   

QUESTION 22

In the Rutherford model of the atom, electrons would not stay in orbit very long because they would spiral down into the nucleus. Yet, the Rutherford Model is similar to the planetary model of the solar system. Why don’t the planets spiral down into the Sun?

The gravitational force is much, much weaker than the electrical force so the effectis virtually non-existent.

Because the planets and Sun are much larger than electrons and a nucleus.

Unlike the gravitational force, the electrical force between two objects increases withtheir separation.

Unlike electrons, planets are not accelerating and therefore don’t emit energy in theform of radiation.

4 points   

QUESTION 23

When two atoms link up we call that:

periodicity.

a chemical bond.

a noble gas.

valence.

4 points   

QUESTION 24

Because of the distribution of electrical charges in metals, metals tend to be:

malleable.

dull (not shiny).

electrically non-conductive.

undesirable for industrial purposes.

4 points   

QUESTION 25

The covalent bond is like the ionic bond because of _________, and it is like the metallic bond because of __________.

the sharing of electrons; the many atoms involved

the relatively few number of atoms involved; the sharing of electrons

the transfer of electrons from one atom to another; the many atoms involved

the few number of atoms involved; the transfer of electrons

4 points   

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a voltage.

a battery.

a wire.

an electric current.

Explanation / Answer

Here ,

when the charges are in motion

we have d) an electric current

16)

for the elector motor

as the motor is rotating and it is an electrical device

the correct option is

Converts electrical energy to mechanical energy and heat.

17)

matter waves need medium to transfer but EM wave don't need any transferring.

hence , the correct option is

Electromagnetic waves can travel through nothing at all.

18)

for the electromagnetic wave

P = E X B

P is pyonting vector

E is electric field and B is mangetic field

the correct option is   
the electric field is perpendicular to the magnetic field and both are perpendicular to the direction of propagation.

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