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physics final revision 10

Total questions: 90

Worksheet time: 1hrs 6mins

Name
Class
Date
1.
An increase in the volume of a substance when the temperature increases is called ___________________________________.
a)
kinetic energy
b)
thermal expansion
c)
temperature
d)
heat
2.

No more energy can be removed from matter at

a)

its freezing point

b)

0°C

c)

absolute zero

d)

273 K

3.

What is Thermal Contraction

a)

The movement of particles.

b)

A decrease in a materials volume when its temperature decreases

c)

The movement of fluids in a cycle because of convection

d)

A material through which thermal energy does not flow easily.

4.
Objects gain heat and _________. 
a)
expand
b)
contract
5.

When temperature decreases, distance between molecules ____________.

a)

increases

b)

decreases

c)

stays the same

6.

Is the following statement true or false?


An object that expands more when heated, will also contract more when the temperature is reduced

a)

True

b)

False

7.
Select the correct formula to calculate linear change in length...
a)
ΔL = LαΔT
b)
ΔT = ΔL/Lα
c)
σ = F/A
d)
ε = ΔL/L
8.
Calculate the change in length of a 100mm aluminium bar that has increased in temperature by 55⁰C.  
Take the coefficient of expansion to be 25 x 10-6
a)
0.258mm
b)
0.1375mm
c)
1.23mm
d)
1.37mm
9.
Select the correct formula to calculate change in temperature.
a)
ΔL = LαΔT
b)
α = ΔL/LΔT
c)
ΔT = ΔLαL
d)
ΔT = ΔL/Lα
10.
Calculate the change in temperature of an 900mm aluminium bar, that has increased in length to 901.035mm.
 α = 25 x 10-6
a)
12oC
b)
34.5oC
c)
57oC
d)
46oC
11.
Convert: 253 C to K:
a)
526 K
b)
625 K
c)
0 K
d)
186 K
12.

The length of copper wire at 20oC is 4.5m. Calculate its new length when the temperature is 95oC. Given α = 1.7×10-5 oC-1

a)

4.55m

b)

5.41m

c)

5.11m

d)

4.505m

13.

A silver plate of 16cm2 is heated from 20 degrees to 100 degrees. What is the increase of area?
assume α=2×10−5\alpha=2\times10^{-5}  

a)

0.051

b)

16.051

c)

0.0256

d)

16.0256

14.

Coefficient of linear expansion, Coefficient of area expansion and Coefficient of volume expansion have the unit of....

a)

oC-1

b)

oC

c)

W m-1 oC-1

d)

J m-1 oC-1

15.

Thermal expansion of liquid depends on the expansion of the container that it fills. However, why does liquid overflow after heating?

a)

because container does not expand

b)

because coefficient of volume expansion for liquid is bigger than the container

c)

because liquid and container expand at the same amount

d)

because particles in solid container is more closely packed together than liquid

16.
Heat transfers from an area of ____temperature to an area of ___ temperature.
a)
high to low
b)
low to high
c)
high to high
d)
It can travel high to low and low to high. 
17.

What is Specific Heat?

a)

The amount of thermal energy required to increase the temperature of 1kg of a material by 1°C.

b)

The amount of radiant energy required to increase the temperature of 1kgof a material by 1°C

c)

The amount of energy required to increase the temperature of 2 kg of a material by 1°C.

d)

The amount of friction required to increase the temperature of 1 kg of a material by 1°C.

18.
Many objects, such as train tracks and road joints, are specifically designed to allow extra space for ...
a)
thermal energy
b)
specific heat
c)
thermal expansion
d)
conductors
19.

Hot coffee is stirred with a spoon, the spoon gets hot due to

a)

Convection

b)

Conduction

c)

Radiation

20.

The length of copper wire at 20oC is 4.5m. Calculate its new length when the temperature is 95oC. Given α = 1.7×10-5 oC-1

a)

4.55m

b)

5.41m

c)

5.11m

d)

4.51m

21.
If two objects have different temperatures, heat will flow from the cooler object to the warmer one.
a)
True
b)
False
22.

Heat transfers in three ways:

a)

radiant, light, energy

b)

conduction, radiation, convection

c)

elastic, kinetic, potential

d)

conduction, oven, microwave

23.

Area expansion is _ that of linear expansion

a)

Once

b)

Twice

c)

Thrice

d)

Not

24.

Volume expansion is _ that of linear expansion

a)

Once

b)

Twice

c)

Thrice

d)

Not

25.

An iron rod of length 50 m and at a temperature of 600C is heated to 700C. Calculate its new length.

(Linear expansivity of iron = 1.2 x 10-5 K-1)

a)

50.006 m

b)

50.060 m

c)

51.600 m

d)

51.200 m

26.

A brass rod is 2m long at a certain temperature. Calculate the linear expansion of the rod for a temperature change of 100 K. (Linear expansivity of brass = 1.8 x 10-5 K-1)

a)

0.3600 m

b)

0.1800 m

c)

0.0360 m

d)

0.0036 m

27.

A metal rod of length 40.00 cm at 200C is heated to a temperature of 450C. If the new length of the rod is 40.05 cm, calculate its linear expansivity.

a)

1.2 x 10-5 K-1

b)

2.5 x 10-5 K-1

c)

3.5 x 10-5 K-1

d)

5.0 x 10-5 K-1

28.

A wire, 20 m long, is heated from a temperature of 50C to 550C. If the change in length is 0.020 m, calculate the linear expansivity of the wire.

a)

1.0 x 10-3 K-1

b)

2.0 x 10-4 K-1

c)

2.0 x 10-5 K-1

d)

2.0 x 10-6 K-1

29.

Steel bars, each of length 3.0 m at 280C, are to be used for constructing a rail line. If the linear expansivity of steel is 1.0 x 10-5 K-1, what is the safety gap that must be left between successive bars if the highest temperature expected is 400C ?

a)

1.2 x 10-1 cm

b)

8.4 x 10-2 cm

c)

3.6 x 10-2 cm

d)

1.8 x 10-2 cm

30.
How heat is transfered?
a)
From high to low temperature
b)
From low to high
c)
Up to down
d)
Left to right
31.

How much heat is required to raise the temperature of a sample of copper from 10.0°C to 55.0°C, if its mass is 10.00 g? specific heat of copper is 0.385 J/(g∙°C).

a)

1881 J

b)

250. J

c)

173 J

d)

359 J

32.
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
c)
convection
d)
thermal energy
33.
IS THE MEASURE OF THE AVERAGE KINETIC ENERGY OF THE PARTICLES IN A SUBSTANCE
a)
TEMPERATURE 
b)
THERMOMETER
34.

How do you calculate heat lost or gained?

a)

m x change in Temperature x specific heat

b)

mass/ change in temperature

c)

mass x change in temperature/ specific heat

d)

mass x change in temperature

35.

What is 45 K in Celsius?

a)

-318

b)

228

c)

318

d)

45

36.

When would an object left in a room temperature 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

37.
The faster molecules move, 
a)
the higher the temperature
b)
the less temperature
c)
the same temperature
d)
I don't know
38.
The diagram to the right shows a solid iron bar that is being heated in a flame. The primary method of heat transfer in the solid iron bar is—
a)
convection
b)
conduction
c)
absorption
d)
radiation
39.
A student opens the top window and the bottom window in a hot room. What statement best describes the heat transfer occurring in the room?
a)
conduction
b)
radiation
c)
convection
d)
evaporation
40.
what is conduction?
a)
direct touch
b)
air or liquids
c)
heat waves/ light waves
d)
drinking hot coffee
41.
what is radiation?
a)
direct touch
b)
air or liquids
c)
heat waves/ light waves
d)
touching the cookies out of the oven
42.
The temperature of a substance increases as___.
a)
the substance expands
b)
the average kinetic energy of its particles increases
c)
the substance's volume increases
d)
the substance's mass increases
43.
heat is energy
a)
false
b)
true
44.
What  is the formula to calculate heat energy required to raise the temperature of any substance?
a)
Q=mc∆t
b)
Q=mc
c)
Q= ½mv
d)
m=QC
45.
What unit do you use to measure Thermal Energy?
a)
J/Kg ºC
b)
Kg
c)
ºC
d)
J
46.
A material was cooled from 100ºC to 40ºC.  What is the temperature change?
a)
60ºC
b)
40ºC
c)
-60ºC
d)
-40ºC
47.

Two capacitors of capacitance C1 and C2 are connected in parallel. What is the effective

capacitance?

a)

C1C2

b)

C1+C2

c)

1C1+1C2\frac{1}{C_1}+\frac{1}{C_2}

d)

C1C2C1+C2\frac{C_1C_2}{C_1+C_2}

48.

Capacitor is a device used to__________

a)

store electrical energy

b)

vary the resistance

c)

store magnetic energy

d)

dissipate energy

49.

What is the value of capacitance of a capacitor which has a voltage of 4V and has 16C of charge?

a)

2F

b)

4F

c)

6F

d)

8F

50.

The capacitance between two plates increases with


a)

Shorter plate area and higher applied voltage

b)

Shorter play area and shorter distance between them

c)

Larger plate area, longer distance between plates and higher applied voltage

d)

Larger plate area and shorter distance between plates

51.

Unit of capacitance is___________

a)

Volts

b)

Farad

c)

Henry

d)

Newton

52.

Total capacitance of 300 mF capacitor and a 600 mF in series is

a)

1000 mF

b)

500 mF

c)

300 mF

d)

200 mF

53.
a)

1/2 C

b)

1/4 C

c)

6/11 C

d)

11/6 C

54.

When 3 capacitors are arranged in series , the equivalent capacitance C is

a)

Ceq = C1 + C2 + C3

b)

1/Ceq = 1/C1 + 1/C2 + 1/C3

c)

Ceq = QV1 + QV2 + QV3

d)

Ceq = CR1 + CR2 + CR3

55.
------------------------ is created out of two metal plates and an insulating material called a dielectric.
a)
An inductor
b)
A capacitor
c)
A fixed resistor
d)
A variable resistor
56.
With respect to the capacitor, which relationship is true?
a)
C = Q/V
b)
V = C×Q
c)
Q = C/V
d)
Q = V/C
57.

What is the unit of measurement for resistance?

a)

Voltage

b)

Ampere

c)

Watts

d)

Ohms

58.

How to you calculate the total resistance in a series circuit?

a)

R1 + R2+ R3

b)

R1 - R2 - R3

c)

1/R1 + 1/R2 + 1/R3

d)

R1 = R2 = R3

59.

How do you calculate total resistance in a parallel circuit?

a)

R1 + R2 + R3

b)

R1 - R2 - R3

c)

1/R1 +1/R2 + 1/R3 = 1/RT

d)

R1 = R2 = R3

60.
What is Resistance?
a)
the degree to which a circuit component opposes the passage of an electric current, causing energy dissipation
b)
How hard the energy is pushed
c)
The amount of charges that pass by a given point per second
d)
None of the above
61.

What is the equivalent or total resistance (Re) across this circuit?

a)

3 kΩ

b)

10 kΩ

c)

13 kΩ

d)

18 kΩ

62.
Which resistor will prevent the most current flow?
a)
1 ohm
b)
100 ohms
c)
1000 ohms
d)
0.5k ohms
63.
How does resistance affect current?
a)
less resistance - less current
b)
more resistance - less current
c)
more resistance - more current
d)
resistance does not affect current
64.

How would the equivalent resistance be determined?

a)

1 / Req = (1/5) + (1/8) + (1/3) Ω

b)

120 Ω

c)

1.5189873 Ω

d)

1 / Req = (1/5) * (1/8) * (1/3) Ω

65.

the formula to find current when the values of V and R are known is

a)

I = V2R

b)

I = V/R

c)

I = R/V

d)

I=VR

66.
What size resistor would produce a 3 Amp current flow with a 12 Volt battery
a)
1 Ohm
b)
3 Ohms
c)
4 Ohms
d)
12 Ohms
67.
What 'flows' in a wire?
a)
Protons
b)
Neutrons
c)
Atoms
d)
Electrons
68.

A current of 0.5 A flows in a circuit. Calculate the charge flowing through the circuit in one minute.

a)

0.5 C

b)

30 C

c)

120 C

69.
What is a formula to calculate Charge
a)
Q=I*t
b)
Q=I/t
c)
Q = V*E
d)
Q = V/E
70.
What is a formula to calculate Charge
a)
Q=t/I
b)
Q=I/t
c)
Q = V*E
d)
Q = E/V
71.
How much charge must pass by a point in 10 s for the current to be  0.50 A? 
a)
0,05C
b)
5,0C
c)
20C
d)
2,0C
72.

A primary cell

a)

does not contain an electrolyte

b)

contains an electrolyte

c)

can be recharged

d)

cannot be recharged

73.

Batteries utilizes the ______________ effect of an electric current.

a)

Lighting

b)

Heating

c)

Chemical

d)

Magnetic

74.

The unit of quantity of electricity is

a)

Ampere

b)

Resistance

c)

Coulomb

d)

Ampere hours

75.

Which of the following is primary cell: (1 Mark)

a)

Lead Acid Cell

b)

Carbon-Zinc cell

c)

Nickel Cadmium Cell

d)

Silver Zinc Cell

76.

In order to obtain a higher current, cells are normally connected in _________. (1 Mark)

a)

series

b)

parallel

c)

rows

d)

opposition

77.

When cells are connected in series, the total voltage of the combination is equal to the _____ of the individual voltages, (1 Mark)

a)

difference

b)

ratio

c)

sum

d)

product

78.

Six batteries, each with an e.m.f of 6V are connected in parallel . What is the output voltage? (2 Mark)

a)

1V

b)

6V

c)

3V

d)

36V

79.
what is this symbol for?
a)
light bulb
b)
switch
c)
battery
d)
resistor
80.
What kind of circuit is this?
a)
Series
b)
Consecutive
c)
Parallel
d)
Training
81.
In a parallel circuit if one of the light bulbs burns out the rest _________.
a)
stop the flow of electricity
b)
 can still light up
c)
 will go out
d)
of the light bulbs burn out also
82.
How should you put in an Ammeter?
a)
In Parallel
b)
In Series
83.
A voltmeter should be placed ........... in a circuit
a)
in parallel
b)
in series
c)
in order
d)
upside down
84.

Two possible units for voltage are

a)

amps

b)

volts

c)

joules

d)

joules per coulomb

85.

Compared to the current through the battery, the current through bulb C is

a)

greater

b)

less

c)

same

86.

in liquid which expansion is possible...

a)

linear expansion

b)

volume expansion

c)

area expansion

d)

all of the above

87.

Find the energy released by a copper block when it is cooled from 100°C to 20°C. Given that the heat capacity of the block is 770 J°C-1.

a)

7.70x104 J

b)

8.61x104 J

c)

6.16x104 J

d)

5.02x104 J

88.

Which of the following statements is correct?

a)

The unit of heat capacity is J kg-1 °C-1.

b)

Specific heat capacity measures the temperature variations when 1J of energy is absorbed.

c)

The unit of specific heat capacity is J kg-1 K-1.

d)

Specific heat capacity equals to the heat content of an object.

89.

Given that the specific latent heat of fusion of a sample is 550 kJ kg-1. Which of the following is correct?

a)

The mass of this sample is 1 kg.

b)

The energy needed to increase the temperature of 1 kg of this sample in solid state through 1oC is 550 kJ.

c)

The energy needed to increase the temperature of 1 kg of this sample in liquid state through 1oC is 550 kJ.

d)

The energy needed to change 1 kg of the material from solid state to liquid state is 550 kJ.

90.

Which material heats up slowest?

a)

Aluminium

b)

Concrete

c)

Diamond

d)

Glass

e)

Water

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