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Fundamentals of Physics > Section 4 > Flashcards

Section 4 Flashcards

1
Q

The force that binds atoms together to form molecules is

A

electrical.

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2
Q

The fundamental force underlying all chemical reactions is

A

electrical.

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3
Q

A fundamental rule of electricity is that: a) like kinds of charges repel; b) unlike kinds of charges attract; c) both of these; d) neither of these.

A

c) both of these.

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4
Q

An electron and a proton: a) attract each other; b) repel each other; c) neither attract nor repel each other.

A

a) attract each other.

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5
Q

In an electrically neutral atom the number of protons in the nucleus is equal to the number of

A

electrons that surround the nucleus.

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6
Q

Which of these does NOT have an electrical charge: a) proton; b) electron; c) neutron.

A

c) neutron.

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7
Q

It is said that electric charge is quantized, which means that the charge on an object: a) may occur in an infinite variety of quantities; b) is a whole-number multiple of the charge on one electron; c) will interact with neighboring electric charges; d) can be neither created nor destroyed; e) is sometimes positive.

A

b) is a whole-number multiple of the charge on one electron.

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8
Q

To say that electric charge is conserved means that no case has ever been found where

A

net charge has been created or destroyed.

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9
Q

To become a negative ion, an atom must

A

gain an electron.

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10
Q

If electrons are stripped from an atom it becomes a

A

positive ion.

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11
Q

A main difference between gravitational and electric forces is that electrical forces: a) attract; b) repel or attract; c) obey the inverse-square law; d) act over shorter distances; e) are weaker.

A

b) repel or attract.

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12
Q

The force between two charged particles depends: a) only on the amount of charge on the two particles; b) on the total charge and gravity; c) only on the distance between the particles; d) on the charge on the quarks; e) on the amount of charge on the two particles and their distance from each other.

A

e) on the amount of charge on the two particles and their distance from each other.

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13
Q

According to Coulomb’s law, a pair of particles that are placed twice as far apart will experience forces that are: a) half as strong; b) one-quarter as strong; c) twice as strong; d) 4 times as strong.

A

b) one-quarter as strong.

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14
Q

__________ is when you bring a charged object near another object and cause a movement of charge.

A

Induction

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15
Q

Conducting materials are composed of atoms with

A

loose outer electrons.

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16
Q

When a material has no electrical resistance it is

A

a superconductor.

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17
Q

Electrons can be transferred from one place to another by the process of: a) friction; b) contact, which means touching; c) induction, which means non-touching; d) all of the above; e) none of the above.

A

d) all of the above.

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18
Q

If you comb your hair and the comb becomes negatively charged, then your hair becomes

A

positively charged.

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19
Q

The unit of electrical resistance is the

A

ohm.

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20
Q

Heat a copper wire and its electric resistance

A

increases.

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21
Q

If two copper wires of the same length have different thickness, then the thicker wire has

A

less resistance.

22
Q

Ohm’s law tells us that the amount of current produced in a circuit is: a) directly proportional to voltage; b) inversely proportional to resistance; c) both of these; d) neither of these.

A

c) both of these.

23
Q

When you double the voltage in a simple electric circuit, you double the

A

current.

24
Q

The voltage across a 10-ohm resistor carrying 5 A is: a) 5 V; b) 10 V; c) 15 V; d) 20 V; e) more than 20 V.

A

e) more than 20 V.

25
Q

The current through a 10-ohm resistor connected to a 120-V power supply is: a) 1 A; b) 10 A; c) 12 A; d) 120 A.

A

c) 12 A.

26
Q

The electric power of a lamp that carries 2 A at 120 V is: a) 1/6 watts; b) 2 watts; c) 60 watts; d) 20 watts; e) 240 watts.

A

e) 240 watts.

27
Q

If an electric toaster rated at 110 V is accidentally plugged into a 220-V outlet, the current drawn by the toaster will be

A

twice its normal value.

28
Q

A 100-Watt incandescent lamp glows brighter than a 25-Watt lamp. The electrical resistance of the 100-Watt lamp must be

A

less.

29
Q

In an ac circuit, the electric field: a) increases via the inverse-square law; b) changes magnitude and direction with time; c) is the same everywhere; d) none of these.

A

b) changes magnitude and direction with time.

30
Q

On some early automobiles both headlights went out when one bulb burned out. The headlights must have been connected in

A

series.

31
Q

Modern automobile headlights are connected in

A

parallel.

32
Q

A circuit breaker often serves the same purpose as a

A

fuse.

33
Q

The source of energy that illuminates a lamp in your home is: a) the power company; b) the electrical outlet c) atoms in the bulb filament; d) the wire leads to the lamp; e) the source voltage.

A

a) the power company.

34
Q

Electrons that are energized to glow in the filament of a common ac lamp are: a) supplied by a wall outlet; b) supplied by a wall outlet, which in turn are supplied by your power company; c) electrons are already in the filament; d) none of the above.

A

c) electrons are already in the filament.

35
Q

Electric power is the rate at which electric energy is converted into another form, in equation form is

A

current multiplied by voltage

36
Q

The power consumed by a device drawing 0.8 A when connected to 120 V is

A

96 W

37
Q

Consider a lamp powered by a battery. Charge flows

A

through both the battery and the lamp.

38
Q

When two lamps are connected in series to a battery, the electrical resistance that the battery senses is: a) more than the resistance of either lamp; b) less than the resistance of either lamp; c) none of these.

A

a) more than the resistance of either lamp.

39
Q

When two lamps are connected in parallel to a battery, the electrical resistance that the battery senses is: a) more than the resistance of either lamp; b) less than the resistance of either lamp; c) none of these.

A

b) less than the resistance of either lamp.

40
Q

When a pair of 1-ohm resistors are connected in series, their equivalent (combined) resistance is 2 ohms, and when connected in parallel is: a) 1/2 ohm; b) none of the above; c) also 2 ohms.

A

a) 1/2 ohm

41
Q

The source of all magnetism is

A

moving electric charge.

42
Q

The force that acts between a pair of magnetic poles depends on: a) magnetic pole strength; b) separation distance; c) both of these; d) neither of these.

A

c) both of these.

43
Q

Like kinds of magnetic poles repel while unlike kinds of magnetic poles

A

attract.

44
Q

A weak and strong magnet repel each other. The greater repelling force is by the: a) stronger magnet; b) weaker magnet; c) both the same; d) none of the above.

A

c) both the same.

45
Q

Whereas electric charges can be isolated, magnetic poles

A

cannot.

46
Q

If you break a bar magnet in half you’ll: a) destroy its magnetic properties; b) have two magnets; c) have two and a half magnets; d) none of the above.

A

b) have two magnets.

47
Q

Where magnetic field lines are more dense, the field there is

A

stronger.

48
Q

An electromagnet can be made stronger by: a) increasing the number of turns of wire; b) increasing the current in a coil; c) both a. and c.; d) none of the above.

A

c) both a. and c.

49
Q

Several paper clips dangle from the north pole of a magnet. The induced pole in the bottom of the lowermost paper clip is a

A

north pole.

50
Q

Magnetic compasses apparently were first used by

A

pigeons, then Chinese.

Fundamentals of Physics (24 decks)

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