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Mid term (Thermal, Waves, and Electrostatics)

Total questions: 80

Worksheet time: 1hrs 20mins

Name
Class
Date
1.
Water boils at 212 degrees on which scale?
a)
Farenheit
b)
Celsius
c)
Kelvin
2.
The transfer of thermal energy through collisions of particles is ___________.
a)
Radiation
b)
Convection
c)
Conduction
3.

we use it to measure temperature

a)

Calorimeter

b)

Thermometer

c)

Seismometer

d)

Gradiometer

4.

Select all the boiling points of water (3 Correct)

a)

100 K

b)

212 F

c)

80 R

d)

373 K

e)

-373 F

5.
Convert: 25.0 oC to oF:
a)
77 F
b)
77 C
c)
100 F
d)
100 C
6.
Convert: 253 C to K:
a)
526 K
b)
625 K
c)
0 K
d)
186 K
7.

The heat from a lamp allows a lizard (lizard is beside the lamp) to remain warm. This is an example of which type of heat transfer?

a)
radiation
b)
conduction
c)
convection
d)
insulation
8.
What is the definition of CONDUCTION?
a)
When heat is transferred from objects like rays of light or electromagnetically.
b)
a  hot liquid or air that  expands, becomes less dense, and rises or becomes more dense, and sinks.
c)
When heat transfers from objects that are touching.
d)
When heat transfers through the heater or AC in your house.
9.

What is the definition of CONVECTION

a)

When heat transfers through waves.

b)

When heat transfers from objects that are touching.

c)

warm fluid rises; cool fluid sinks

d)

Heat traveling from the sun

10.
An insulator . . .
a)
Allows a lot of heat to escape
b)
Makes the temperature of an object rise
c)
Moves heat from one place to another
d)
Traps heat inside an object
11.
Which is a TRUE statement comparing the density of gases and liquids?  
a)
Gases have higher density than liquids because the atoms are further apart
b)
Gases have lower density than liquids because the atoms are closer together
c)
 Gases have lower density than liquids because the atoms are further apart 
d)
Gases have higher density than liquids because the atoms are closer together
12.
As the temperature of a solid or liquid increases, the force of attraction between the atoms/molecules...... 
a)
increases
b)
decreases
c)
remains the same
13.
Why does warm air rise and cool air sink?
a)
Warm air is less dense than cooler air.
b)
Warm air is more dense than cooler air.
c)
Warm air weighs less than cooler air.
d)
Warm air weighs more than cooler air. 
14.

When would a hot object left in a room stop transferring heat?

a)

When it has reached the same temperature as the room temperature air

b)

When it has lost all of its thermal energy

c)

When it has gained all of the air's thermal energy

d)

When it has gained or lost all of it's coldness to the air

15.
The transfer of thermal energy between objects of different temperatures is called...
a)
temperature
b)
heat 
c)
none of these
16.
When thermal energy is added to a substance, the substance's particles move: 
a)
More rapidly at an increased distance from each other
b)
More rapidly with less distance between each other
c)
More slowly with a greater distance between each other
d)
More slowly with a reduced distance be
17.
The amount of heat required to raise the temperature of one gram of a substance by one degree Celsius is ________
a)
Heat energy
b)

Specific heat capacity

c)

Heat capacity

d)
thermal energy
18.

An object with an emissivity closer to 1 is more likely to be

a)

White in color

b)

Green in color (photosynthesis)

c)

Black in color

d)

Golden

19.
To turn a liquid into a solid, you _____ energy.
a)
Add
b)
Remove
20.
To turn a liquid into a gas, you _____ energy.
a)
Add
b)
Remove
21.

Which of the followings do not affect the rate of conduction?

a)

Temperature difference

b)

Cross-sectional area

c)

Thickness

d)

Stefan-Boltzmann constant

e)

coefficient of thermal conductivity

22.

How much heat is required to raise the temperature of a 225 g lead ball from 15.0 oC C to 25.0 oC? The specific heat of lead is 128 J/kg.K

a)

725 J

b)

576 J

c)

145 J

d)

288 J

23.

Which thermal exchange process does not require a medium?

a)

Conduction

b)

Convection

c)

Radiation

d)

Evaporation

24.

Which thermal exchange process carries thermal energy through boiling water as it heats up on top of a stove?

a)

Conduction

b)

Convection

c)

Radiation

d)

Evaporation

25.

What is the SI unit of the coefficient of thermal conductivity?

a)

J/ (s m ºC)

b)

J/ (Kg s m ºC)

c)

J/ (Kg ºC)

d)

(J Kg) / ºC

26.

What is the formula to calculate specific latent heat of vaporisation?

a)

l=Qml=\frac{Q}{m}

b)

c = Q/(mΔƟ)

c)

Q = mcΔƟ

d)

Q=mlQ=ml

27.
No more energy can be removed from matter at:
a)
its freezing point
b)

0 °C

c)

0 K

d)

Relative zero

e)

0 °F

28.
As the frequency of an electromagnetic wave increases, the amount of energy in that wave...
a)
increases.
b)
decreases.
c)
stays the same.
29.
Which of the following electromagnetic waves has the lowest energy?
a)
gamma ray
b)
infrared wave
c)
visible light wave
d)
microwave
30.
What are electromagnetic waves?
a)

Mechanical waves that can travel through a vacuum

b)

Electric & Magnetic fields that travel through empty space

c)

Waves produced by subtracting electric field's energy from magnetic field's energy

d)
things like longitudinal waves
31.

Which type of electromagnetic radiation travels at the highest speed through a vacuum?

a)

gamma ray

b)

x-ray

c)

radio waves

d)

All of the above

32.

Which one is not a property of electromagnetic wave

a)

They travel in a vacuum

b)

They travel at 3 x 108 km/s in a vacuum

c)

They are transverse waves

d)

They do not transfer matter

33.

What unit is used to measure the number of complete wave cycles in a second?

a)

Hertz

b)

seconds

c)

Lamda

d)

Decibels

34.

It can convert sound waves into Audio Frequency signals.

a)

amplifier

b)

microphone

c)

radio station

d)

carrier wave

35.
This type of EM wave can cause skin cancer. 
a)
microwaves
b)
ultraviolet ray
c)
radio
d)
infrared
36.

Which of these is emitted by remote controls to communicate with TV?

a)

Radio waves

b)

Infrared radiation

c)

Ultraviolet

d)

X-rays

e)

Gamma rays

37.

Which of these is used to detect fake banknotes?

a)

Radio waves

b)

Infrared radiation

c)

Ultraviolet

d)

X-rays

e)

Gamma rays

38.

Which of these is used to detect broken bones and to scan luggage at airports?

a)

Radio waves

b)

Infrared radiation

c)

Ultraviolet

d)

X-rays

e)

Gamma rays

39.

Which EM wave lies between radio waves and infrared radiation when listed in order of increasing frequency?

a)

Visible light

b)

Microwaves

c)

Visible

40.

Define Frequency modulation 

a)

Changing the frequency of Audio Frequency signals to match that of the carrier

b)

Changing the amplitude of Audio Frequency signals to match that of the carrier

c)

Making electrons vibrate in an antenna

d)

Changing the frequency of the carrier to match that of the Audio Frequency signals

41.

What is the speed of light in a vacuum in km/s?

a)

3,000

b)

300

c)

300,000

d)

300, 000, 000

42.

In which region of the electromagnetic spectrum can waves have a wavelength of 1000 m?

a)

Gamma

b)

Radio

c)

Visible

43.

In which region of the EM spectrum can waves have a wavelength of 600 nm?

a)

Visible

b)

Radio

c)

Microwaves

44.

Visible light from the sun has an average wavelength 550 nm. Calculate the frequency of this light.

a)

5.4 x 1014 Hz

b)

5.5 x 1014 Hz

c)

1.8 x 10-15 Hz

d)

1.7 x 102 Hz

45.

Why are radio waves used for broadcasting?

a)

They can penetrate the ionosphere

b)

They have a long wavelength

c)

They can diffract and have long wavelengths

d)

They can diffract

46.

In a RADAR system, the following are true EXCEPT

a)

The antenna whirls to send signals in all directions

b)

The transmitter transfers the reflected waves to the observer

c)

The transmitter produces microwave signals in pulses

d)

The receiver detects incoming reflected pulses

47.

TWO uses of Microwaves are:

a)

to heat food

b)

in communication satellites

c)

to transmit a radio signal

d)

in fibre optics

48.

What EM wave is used in sterilizing water from drinking fountains?

a)

a. infrared waves

b)

b. microwaves

c)

c. radio waves

d)

d. ultraviolet

49.

What electromagnetic wave do humans emit as heat energy?

a)

infrared light

b)

ultraviolet light

c)

visible light

d)

microwaves

50.

What type of electromagnetic wave is present in this image? Tick all that applies.

a)

Radio wave

b)

Infrared Wave

c)

Ultraviolet Ray

d)

Visible light

e)

Electricity

51.
Which section of the spectrum is the ONLY one we can see?
a)
X-rays
b)
Visible Light
c)
Gamma Rays
d)
Ultraviolet Rays
52.

This EM region is used in thermal scanner

a)

infrared waves

b)

x-rays

c)

microwaves

d)

ultraviolet rays

53.

What vitamin is made by UV radiation to keep us healthy?

a)

Vitamin A

b)

Vitamin B

c)

Vitamin C

d)

Vitamin D

54.

It is used to find position and speed of objects by bouncing radio waves off the object.

a)

RADAR

b)

MRI

c)

GPS

d)

SONAR

55.

How far away is an object if it takes 2s for a microwave signal to make a round trip after been reflected by the object?

a)

600 000 m

b)

300 000 km

c)

300 m

d)

600 km

56.
Which of the following is the bending of a wave, which changes its speed.
a)
Reflection
b)
Diffraction
c)
Refraction
d)
Frequency
57.

Which type of interaction is this?

a)

reflection

b)

refraction

c)

diffraction

58.
What is interference of waves?
a)
A superposition of two waves to form a resultant wave with higher or lower frequency.
b)
A superposition of two waves to form a wave of larger or smaller amplitude.
c)
A superposition of two waves to form a resultant wave with higher or lower velocity.
d)
A superposition of two waves to form a resultant wave with longer or shorter wavelength.
59.

True or false? Sometimes during wave interaction, both constructive and destructive interference can occur at the same time.

a)
True
b)
False
60.
Standing waves are formed --
a)
by the superposition of two or more waves moving in opposite directions.
b)
by the superposition of two or more waves moving in the same direction.
c)
by the superposition of two or more waves moving in perpendicular directions.
d)
by the superposition of two or more waves moving in any arbitrary directions.
61.
The following is an example of which type of interference? 
a)
constructive 
b)
destructive 
62.
Which wave behavior do noise cancelling headphones use?
a)
diffraction
b)
refraction
c)
constructive interference
d)
destructive interference
63.
The image describes what kind of interference?
a)
constructive 
b)
destructive 
c)
both, resulting in a beat
d)
none, resulting in a beat
64.
This image is representing what wave interaction?
a)
Refraction
b)
Diffraction
c)
Reflection
d)
Interference
65.
The fact the two angles are the same is an example of....
a)
Refraction
b)
Angle of Incidence
c)
Law of reflection
d)
Magnification
66.
What is happening in this picture?
a)
Reflection
b)
Refraction
c)
Diffraction
d)
Absorption
67.
If a substance has a higher number of electrons than protons on its surface, what type of charge does it have?
a)
A positive charge.
b)
A negative charge.
c)
A neutral charge
d)

A net negative charge

e)

A net positive charge

68.

What is the SI unit of electric charge?

a)

Coulomb

b)

Coulamb

c)

coulomb

d)

coulamb

69.
An object becomes postiively charged when which of the following occurs?
a)

gains protons

b)
gains electrons
c)
loses protons
d)

gains neutrons and protons

e)

loses electrons

70.
Which of the following an insulator?
a)
copper
b)
wood
c)
silver
d)
salt water
71.

If an object has the same number of positive and negative charges, its net electrical charge is...

a)
positive
b)
negative
c)

neutral or zero

d)
opposite
72.
In a neutral atom, the number of electrons is equal to the number of _______.
a)
Neutrons
b)
Orbits
c)
Protons
d)
subatomic particles
73.

According to the planetary model of an atom, which is not part of the 3 building blocks of an atom

a)
electrons
b)
protons
c)
neutrons
d)

nucleus

74.
If you bring a charged object near an electrically neutral surface without allowing the object to touch the surface, the charges in the surface are rearranged by
a)
friction.
b)
convection.
c)
induction.
d)
conduction.
75.
Objects that have opposite charges
a)
are attracted to each other, and the force between the objects pulls them together.
b)
are attracted to each other, and the force between the objects pushes them apart.
c)
are repelled by each other, and the force between the objects pulls them together.
d)
are repelled by each other, and the force between the objects pushes them apart.  
76.

Mr. Jumping Jack rubbed two balloons with a piece of wool. What will happen when the balloons are brought near each other?

a)
The balloons will repel each other.
b)
The balloons will attract each other.
c)

The balloons will neither repel nor attract

d)

Is Mr. Jumping Jack that bored to start playing with balloons?

77.
When a balloon is rubbed on clothes it acquires a charge by ___________
a)
Induction
b)
reduction
c)
friction 
d)
concuction
78.

What is the magnitude of the basic charge carried by all atoms?

a)

1.60 ×10−19C1.60\ \times10^{-19^{ }}C  

b)

1.69 ×10−10C1.69\ \times10^{-10}C  

c)

−1.60 ×10−19C-1.60\ \times10^{-19^{ }}C  

d)

+1.60 ×10−19C+1.60\ \times10^{-19^{ }}C  

79.
When distance increases, electrostatic force ____________; we call this relationship ____________ proportional
a)
decreases;directly
b)
decreases;inversely
c)
increases;inversely
d)
increases;directly
80.
Electrostatic force F is directly proportional to:
a)
r^2 (distance squared)
b)
q1
c)
q2
d)
both q1 and q2

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