Keep the Heat test 1-14-2012 Team Name Team Number Circle the all of the correct answer to the below questions. One or more of the answers can be correct, if more than on one answer is correct, circle all correct answers.

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27 Οκτ 2013 (πριν από 4 χρόνια και 8 μήνες)

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Keep the Heat

test

1
-
14
-
2012

Team Name

Team Number

Circle the
all of the
correct answer to the below questions.

One or
more
of the answers can be correct, if more than on

1)

Convert the temperature of
-
40 C to
degrees
Fahrenheit

a)

-
104

F

b)

-
54

F

c)

-
40

F

d)

10

F

e)

233

F

2)

Convert the temperature of 32 C to
degrees
Rankline

a)

-
409

R

b)

-
370

R

c)

485

R

d)

509

R

e)

549

R

3)

Convert the temperature of 100 F to
degrees
Celsius

a)

24 C

b)

38

C

c)

88 C

d)

122 C

e)

148 C

4)

Convert the temperature of 32 F
to
degrees
Kelvin

a)

259 K

b)

273

K

c)

299 K

d)

323 K

e)

388 K

5)

An Object starts at 50 C, energy is added until the temperature increases to 60 C for a total ∆T of 10 C. What
is the temperature change as expressed in degrees Kelvin

a)

-
263 K

b)

10 K

c)

50 K

d)

283 K

e)

510 K

6)

An Objec
t starts at 85 C, energy is added until the temperature increases to 100 C for a total ∆T of 15 C. What
is the temperature change as expressed in degrees Fahrenheit

a)

8.3 F

b)

15

F

c)

27

F

d)

40 F

e)

59

F

7)

Which of the following statement is
/are

correct?

a)

Heat is a form

of energy and it is contained inside a body

b)

The t
emperature of a body does not depend on the internal energy it possesses

c)

When two bodies of different temperatures are in thermal contact, internal energy are transferred from the
body of higher temperature

to that of lower temperature

d)

It is impossible to transfer

heat

energy from one body to another if they are at the same temperature

8)

Which of the following
statements
/are

Correct
?

a)

it is the energy transferred due to temperature differenc
e

b)

i
f Object A has a higher temperature than Object B, Object A must have more thermal energy than Object
B.

c)

it has the same meaning as work

d)

it is related to degree of hotness

9)

The specific heat capacity of a substance is the heat required to warm

a)

it by 1 d
egree Celsius

b)

1 kilogram of water by one degree Celsius

c)

1 kilogram of it by one degree Celsius

d)

an equal weight of water by one degree Celsius

10)

Given the specific heat capacity of ice is 2100 Jkg
-
1o
C
-
1
, and the specific heat capacity of water is 4200 Jkg
-
1
o
C
-
1
. For the same mass of ice and water,

if the same amount of heat is added to the ice and water:

a)

The temperature of the Ice will increase 2 times the temperature increase of the water

b)

The temperature of the Ice and water will increase the same amount.

c)

T
he temperature of the Ice will increase 0.5 times the temperature increase of the water

d)

Not enough information is provided determine the relative temperature change

11)

The specific heat capacity of a water is 4200 Jkg
-
1o
C
-
1

means that if we have 1 kg of wate
r:

a)

a heater of power 1 W would take 4200s to heat the water before it boils

b)

a heater of power 4200 W would take 1 s to heat the water from 300 K to 301 K

c)

the water contains 4200 J of internal energy

d)

4200 J are needed to turn the water into steam

12)

By E = mc

T and c = 4200
Jkg
-
1o
C
-
1
. Calculate the energy used to heat the water. (Given Mass of water m = 2
kg, Initial temperature T1 = 80

o
C
, Final temperature T2 = 100
o
C

)

a)

672000J

b)

840000J

c)

168000J

d)

120000J

13)

Sublimation occurs when

a)

liquid water changes to gaseous
water.

b)

gaseous water changes to ice.

c)

ice c
hanges to
gaseous water
.

d)

ice changes to liquid water.

e)

liquid water changes to ice.

14)

Which items below are Intensive properties:

a)

Energy

b)

Mass

c)

Pressure

d)

Specific Heat

e)

Temperature

f)

Weight

g)

Volume

h)

Density

15)

Which of the fol
lowing are valid expressions for a transfer of energy between two systems:

a)

Rapidly siring a pot of water to increase the temperature by 1 degree Fahrenheit

b)

Fire is heating a pot of water to increase the temperature by 20 degrees Celsius

c)

Placing an Ice Cube

from the freezer into your glass

d)

Placing a container of hot water in direct contact with a container of cold water where the hot water cools
down and the cold water warms up.

e)

A river flows into a reservoir and adds energy to the reservoir.

f)

You lift a bag
of groceries out of a car

16)

Which of the following are expressions of microscopic energy:

a)

A vehicle is sitting on top of a large hill

b)

The kinetic energy of individual molecules

c)

The potential energy stored in candle wax

d)

A ball is flying through the air at

10 feet / second.

e)

An average donut is 320 calories

17)

Which of the following is the best definition of gauge pressure?

a)

The minimum possible pressure reading that is measurable using a given pressure gauge

b)

The maximum possible pressure reading that is measur
able using a given pressure gauge

c)

The pressure reading which is measured using a given pressure gauge, for which the zero pressure point
is atmospheric pressure

d)

The pressure reading which is measured using a given pressure gauge, for which the zero pressur
e point
is defined by the perfect vacuum

e)

The maximum resolution of the pressure reading that is measurable using a given pressure gauge

18)

A heat engine has a thermal efficiency of 45%. How much power does the engine produce when heat is
transferred into it
at a rate of 10
9

kJ/Hr?

a)

50 MW

b)

75 MW

c)

100 MW

d)

125 MW

19)

The thermodynamic efficiency of a heat engine that rejects heat at a rate of 20 MW when heat is supplied to it
at a rate of 60 MW is:

a)

33.3%

b)

50%

c)

66.7%

d)

75%

20)

Which of the following laws of physics b
ecomes the foundation of thermodynamics?

a)

Newton’s laws of motion

b)

Law of conservation of energy

c)

Law of universal gravitation

d)

Law of conservation of momentum

21)

The word
thermodynamics
stems from two Greek words meaning

a)

conservation of heat

b)

conversion

of heat

c)

study of heat

d)

movement of heat

22)

When heat is added to a system, all of the following may happen EXCEPT

a)

increase in internal energy.

b)

decrease in the system’s temperature.

c)

external work is done by the system.

d)

increase in the pressure in the system.

23)

All real

refrigerators require
work
to get heat to flow from a cold area to a warmer

area. Which of the following
parts of the refrigerator does
work
for this purpose?

a)

coils

b)

lamp

c)

condenser

d)

motor

24)

A system does no work even when heat is added to it. Which of the fo
llowing may

happen to the system?

a)

The system expands

b)

The internal energy of the system increases

c)

Both a and b

d)

Neither a nor b

25)

What do you call an object that does not significantly change in temperature and

internal energy even when
ed to it?

a)

Heat sink

b)

Reservoir

c)

Working substance

d)

Heat engine

26)

The natural direction of heat flow is from high
-
temperature reservoir to a low

temperature

reservoir,
regardless of their respective heat contents. This fact is

incorporated in the

a)

first law of t
hermodynamics.

b)

second law of thermodynamics.

c)

law of conservation of energy.

d)

law of conservation of entropy.

27)

In which of the following sets of temperature of two reservoirs will a heat engine be most efficient?

a)

1140 K and 1140 K

b)

1140 K and 0 K

c)

1140 K and 7
00 K

d)

700 K and 300 K

28)

If 50 grams of ice and 50 grams of water are both at 0
o
C, then it is true that

a)

the water molecules have a higher average kinetic energy than the ice molecules

b)

the ice molecules have a higher average kinetic energy than the water molec
ules

c)

the water molecules have a higher total potential energy than the ice molecules

d)

the ice molecules have a higher total potential energy than the water molecules

29)

A block of ice at
-
10
o
C is slowly heated and converted to steam at 100
o
C. Which of the fo
llowing curves
represents the phenomenon qualitatively

30)

A block of metal is heated to a temperature much higher than the room
temperature

and allowed to cool in a
room free from air currents. Which of the following curves
correctly

represents the rate
of cooling?

31)

An adiabatic expansion of a gas is one in which

a)

the pressure is kept constant

b)

the volume is kept constant

c)

the temperature is kept constant

d)

it neither loses nor gains heat

32)

Which of the following statements is NOT true?

a)

All reversible engines
operating

between same two temperatures have same efficiency

b)

No engine can be more efficient than carnot engine

c)

Carnot engine is a
reversible

engine

d)

Efficiency of a
reversible

engine depends on its working substance.

33)

Which of the la
ws of Thermodynamics is often invoked to discredit attempts at perpetual motion?

a)

Zeroth

b)

First

c)

Second

d)

Third

e)

Fourth

34)

In what year did Anders Celsius propose the international temperature scale bearing his name?

a)

1614

b)

1655

c)

1703

d)

1742

e)

1821

35)

This person is oft
en
called the father of thermo
dynamics

a)

b)

George Brayton

c)

Anders Celsius

d)

Rudolf Diesel

e)

Daniel Gabriel Fahren
heit

36)

Which of the following were NOT credited with optimizing
or improving
thermal engines?

a)

Miller

b)

Otto

c)

Atkinson

d)

Watt

e)

Fahrenhe
it