Heat and temperature
1. heat is:
2.
3.
4.
5.
6.
a- Energy transfer by a temperature difference
b- Energy transfer by microscopic work
c- Energy content of an object
d- A temperature difference
e- A property of objects have by virtue of their temperature
Express 68º F in ºC:
a- 7.0 ºC
b- 20 ºC
c- 36 ºC
d- 181 ºC
e- 273 ºC
Room temperature is about 20 degrees on the:
a- Kelvin scale
b- Celsius scale
c- Fahrenheit scale
d- Absolute scale
e- None of the above
Phase changes occur:
a- As the temperature decreases
b- As the temperature increases
c- As the temperature remain the same
d- All the above
e- None of the above
The heat required to change substance from the solid to the liquid phase is:
a- Heat of fusion
b- Heat of vaporization
c- Heat of melting
d- Heat of freezing
e- None of the above
The calorie (abbreviated cal) is defined as:
a- The amount of heat required to raise the temperature of one gram of water
from 14.5ºC to 15.5ºC
b- The amount of heat required to raise the temperature of one Kilo-gram of
water from 14.5ºC to 15.5ºC
c- quantity of heat required to raise the temperature of one pound (weight) of
water 1 F from 63ºF to 64ºF
d- quantity of heat required to raise the temperature of one pound (weight) of
water 1 F from 211ºF to 212ºF
e- None of the above
7. British thermal unit, or Btu is defined as:
a- The amount of heat required to raise the temperature of one gram of water
from 14.5ºC to 15.5ºC
b- The amount of heat required to raise the temperature of one Kilo-gram of
water from 14.5ºC to 15.5ºC
c- quantity of heat required to raise the temperature of one pound (weight) of
water 1 F from 63ºF to 64ºF
d- quantity of heat required to raise the temperature of one pound (weight) of
water 1 F from 211ºF to 212ºF
e- None of the above
8. The specific heat of an object is:
a- The amount of heat energy to change the state of one gram of the substance.
b- The amount of heat energy per unit mass emitted by oxidizing the substance
c- The amount of heat energy per unit mass to raise the substance from its
freezing to its boiling point
d- The amount of heat energy per mass per temperature change
e- The temperature of the object divided by its mass.
9. Conduction is
a- The mechanism of heat transfer occurs within a body or between two bodies
in contact.
b- The mechanism of heat transfer occurs in the space between bodies .
c- The mechanism of heat transfer depends on motion of mass from one region
of space to another.
d- The mechanism of heat transfer by electromagnetic radiation, with no need for
material to be present in the space between bodies
e- None of the above
10. A sublimation is:
a- The change directly from the gaseous to the solid phase.
b- The change directly from the solid to the gaseous phase
c- The change directly from the solid to the liquid phase
d- The change directly from the liquid to the gaseous phase
e- None of the above
Sound and hearing
11. The lower the frequency of a wave,
a- the higher its velocity
b- the longer its wavelength
c- the smaller its amplitude
d- the shorter its period
e- None of the above
12. An entirely longitudinal wave is
a- a water wave
b- a sound wave
c- an electromagnetic wave
d- a wave in a stretched string
e- None of the above
13. Sound cannot travel through a
a- vacuum
b- gas
c- liquid
d- solid
e- None of the above
14. a sound wave is
a- Transverse wave
b- Kind of electromagnetic wave
c- Longitudinal wave
d- The name given to any wave in the auditory response frequency range
(approximately 50-20000 Hz)
e- None of the above
15. Sound variation with frequencies less than 20 Hz are called
a- Infrasonic
b- Ultrasonic
c- Supersonic
d- Audible range
e- None of the above
16. Which of the following properties of a sound wave determine its "Pitch"?
a- Amplitude
b- Distance from source to detector
c- Frequency
d- Phase
e- Speed
17. Beats in sound refer to:
a- Interference of two waves of the same frequency
b- Combination of two waves of slightly different frequency
c- Reversal of phase of reflected wave relative to incident wave
d- Two media having slightly different sound velocities
e- Effect of relative motion of source and observer.
18. Which of the following increases when a sound becomes louder
a- Frequency
b- Amplitude
c- Wavelength
d- Velocity
e- Acceleration
Fluids
19. All fluids are:
abcde-
gases
liquids
gases or liquids
non-metallic
Transparent.
20. Density is:
abcde-
proportional to both mass and volume
proportional to mass and inversely proportional to volume
inversely proportional to mass and proportional to volume
inversely proportional to both mass and volume
none of the above.
21. Pascal (pressure unit ) is:
abcde-
N/m2
Kg/m2
N/m
Kg/m
g/m2
22. Pressure is:
abcde-
proportional to force and inversely proportional to area
proportional to both force and area
inversely proportional to force and proportional to area
inversely proportional to both force and area
none of the above.
23. One piston in a hydraulic lift has an area that is twice the area of the other when
the pressure at the smaller piston is increased by Δp the pressure at the pressure
at the lager piston:
a- increases by 2p
b- increases by p/2
c- increases by p
d- increases by 4p
e- does not changed.
24. The pressure exerted on the ground by a man is greatest when:
a- He stand with both feet flat on the ground
b- He stand flat on one foot
c- He stand on the toes of one foot
d- He lies down on the ground
e- allof the above yield the same pressure
25. for an ideal and incompressible fluid, the Bernoulli's equation relates:
a- the pressure and flow height
b- the pressure and flow speed
c- the flow speed and flow height
d- the pressure , flow speed and flow height
e- all answers are correct
26. to obtain absolute pressure from the gauge pressure :
a- subtract atmospheric pressure
b- add atmospheric pressure
c- subtract 273
d- add 273
e- convert to N/m2
27. to obtain gauge pressure from the absolute pressure :
a- subtract atmospheric pressure
b- add atmospheric pressure
c- subtract 273
d- add 273
e- convert to N/m2
3
3
28. 50 cm of wood is floating on water , and 50 cm of iron is totally
submerged . which has the greater buoyant force on it?
a- The wood
b- The iron
c- Both have the same buoyant force
d- Cannot be determined without knowing their densities
e- None of the above
29. A block of ice (density 920 kg/m3)and block of iron (density 7800 kg/m3)
are both submerged in a fluid. Both blocks have the same volume. Which
block experiences the greater buoyant force?
a- The block of iron
b- The block of ice
c- Both have the same buoyant force
d- Cannot be determined without knowing the density of fluid
e- None of the above.
30. A plastic block of dimensions 2.00 cm ×3.00 cm ×4.00 cm has the mass of
30 gr. What is its density?
a- 0.8 gr/cm3
b- 1.2 gr/cm3
c- 1.25 gr/cm3
d- 1.60 gr/cm3
e- 3.2 gr/cm3
31. Consider a brick that is totally immersed in water. The long edge of the
brick is vertical. The pressure on the brick is:
a- The same on all surfaces of the brick
b- Greatest on the face with largest area
c- Greatest on the top of the brick
d- Greatest on the sides of the brick
e- Greatest on the bottom of the brick
32. A hydraulic press has an input piston 10 mm in diameter and an output
piston 50 mm in diameter. Aninput force of 80 N gives an output force of:
a- 3.2 N
b- 400 N
c- 16 N
d- 2000 N
e- None of the above.
33. hydraulic press has an input piston 10 mm in diameter and an output
piston 50 mm in diameter.Pushing the input piston through 40 mm causes
the output piston to be pushed by:
a- 1.6 mm
b- 8 mm
c- 40 mm
d- 200 mm
e- None of the above.
34. A gram is:
a)
b)
c)
d)
e)
10-6 kg
10-3 kg
1 kg
103 kg
106 kg.
35. Which of the following is a vector?
a)
b)
c)
d)
e)
mass
temperature
density
displacement
none of the above.
36. The inertia of a body tends to cause the body to:
a)
b)
c)
d)
e)
speed up
slow down
resist any change in its motion
fall toward the Earth
decelerate due to friction.
37. Action- Reaction forces:
a)
b)
c)
d)
e)
Sometimes act on the same object
Always act on the same object
May be at right angle
Always act on two different objects
none of the above.
38. When an object that is undergoing simple harmonic motion passes through its
equilibrium position, its velocity is:
a) Zero
b) Half its maximum value
c) Third its maximum value
d) Its maximum value
e) None of the above.
39. In simple harmonic motion the restoring force must be proportional to the:
a)
b)
c)
d)
e)
mass
frequency
velocity
displacement
displaced squared.

40. What are the x– and y–components of the vector E
a) Ex= Ecosβ, Ey= E sin β
b) Ex= E sin β, Ey= Ecosβ
c) Ex= –Ecosβ, Ey= –E sin β
d) Ex= –E sin β, Ey= –Ecosβ
e) Ex= –Ecosβ, Ey= E sin β
41. The period of a simple harmonic oscillator does not depend on?
a) its mass
b) its frequency
c) its force constant
d) its amplitude
e) none of the above
42. When an object that is undergoing simple harmonic motion passes
through its equilibrium position, its velocity is
f)
g)
h)
i)
j)
Zero
Half its maximum value
Third its maximum value
Its maximum value
None of the above
43. To increase the period of a harmonic oscillator from 3 to 6 s, its original mass of
20 g should be changed to
a) 5g
b) 10 g
c) 40 g
d) 80 g
e) 100g