ISCI Exam 3 - Study Group

The current through a 10 ohm resistor connected to a 120-V power supply is

12 A

when a 10-V battery is connected to a resistor, 2 A of current flow in the resistor. What is the resistor's value?

5 ohms

Why does the leaf of a plant look green?

Because it reflects green light.

Which statement is correct? Current flows through a circuit. Voltage flows through a circuit. Current causes voltage. Resistance increases current.

Current flows through a circuit.

Because the image is real, upright, and smaller than the actual object, a convex mirror is the best choice for a passenger side mirror on an automobile.

False

Most of the electromagnetic spectrum consists of visible light.

False

Which of the following are additive primary colors? I. blue II. magenta III. green

I and III only

_________ light is light that travels in only one plane.

Polarized

You can demagnetize a magnet by exposing it to a high temperature.

True

The advantage of parallel circuits over series circuits in homes and buildings is that

When one appliance or light is turned off, they all don't go off.

Which of these electromagnetic waves has the shortest wavelength?

X rays

Which has the greatest resistance?

a long, thin wire.

Like kinds of magnetic poles repel, unlike kinds of magnetic poles

attract.

An ampere is a unit of electrical

current

The type of lens that spreads parallel light is a

diverging lens.

When a voltage across the ends of a piece of wire is doubled, the current is

doubled

A balloon will stick to a wooden wall if the balloon is charged

either positively or negatively.

Electric current from a battery is made up of moving _________.

electrons

Magnetic domains normally ocurr in

iron

Relative to ultraviolet waves, the wavelength of infrared waves is

longer

A converging lens with the object being viewed loctae between the lens and the focal point, will resuly in an image that is

magnified, upright, and virtual.

A 5 A current runs through a 10 ohm resistor. What is the voltage behind the current?

more than 20 V

Rub electrons from your hair with a comb, and the comb becomes

negatively charged.

An iron nail is more strongly attracted to the

north or south pole - no difference really.

A modern house is wired with what type of circuits?

parallel

The headlights, radio, and defroster in an automobile are connected in

parallel.

When combing your hair, you transfer electrons from your hair onto the comb. Your hair will now be

positively charged.

Magenta is really a mixture of

red and blue light.

In a series circuit, adding more bulbs

reduces the brightness of the bulbs.

The color of an opaque object is the same as the light that is

reflected.

Like charges

repel each other.

When ultraviolet light is incident upon glass, atoms in the glass

resonate.

Why does a girl's hair separate and fly away above her head when she's touching a Van de Graaff generator?

the hair becomes negatively charged and like charges repel.

The magnetic field of a bar magnet is weakest at

the middle of the bar magnet.

An iron rod becomes magnetic when

the net spins of its electrons are in the same direction.

The main difference between a radio wave and a light wave is its speed. wavelength. frequency. all of the above two of these

two of these

Which of the following electromagnetic waves has the greatest energy?

ultraviolet

The natural frequency of the atoms in glass is in the

ultraviolet part of the spectrum.

In a ________ image, the object and the image are always on the same side of the lens.

virtual

The image perceived through a diverging lens will be

virtual, upright, and smaller than the actual object.

Which represents the correct order of waves in the electromagnetic spectrum from low to high frequency?

visible light, ultraviolet, gamma rays

Dropping a magnet on concrete

weakens it by misaligning the magnetic domains.

The complementary color of blue is

yellow

The brightest color emitted by the sun is

yellow-green