Quiz 2: Density Lab Quiz A Results

Physics I
(administered on 9/14/98)

Intr@net Quiz #2A: Density Lab

EQUATIONS:
y = mx + b
m = [ y₂ - y₁ ] ¸ [ x₂ - x₁ ]
% = | E - A | ¸ A * 100

Question 1

Define the term meniscus.

the "concave" surface of a water column resulting from surface tension and the adhesion between the molecules of the water and those present in the glass cylinder's walls
a high degree of this means that when an experimental value is compared to an accepted value there is very little error
a high degree of this means that when an experiment is repeated, the same value is obtained
the "convex" surface of a water column resulting from surface tension and the cohesion between the molecules of the water and those present in the glass cylinder's walls
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Question 2

A metric unit which is used to measure the volume of small solid objects.

cm
cm³
mL
mL³
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Question 3

Which one of the following is NOT a recommended procedure when measuring with a triple beam balance?

Zeroing the balance before all measurements are taken
Arranging the item symmetrically on the pan so that its center of mass is co-incident with the pan's center of mass
Making sure that the counterweights rest securely in their grooves
All of the above procedures are recommended when using a triple beam balance to obtain the most accurate value for an object's gravitational mass.
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A group of students each measured the mass of a penny.
Their results are listed below:

3. 31 g
3. 50 g
3. 45 g
3. 50 g
3. 62 g
4. 25 g
3. 75 g

Question 4

The mean of this collection of data is

3.31 g
3.50 g
3.63 g
4.25 g
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Question 5

Given that the standard deviation that was calculated for this data set equals O.29 grams

Which value in the group falls in an interval beyond 1 standard deviation but less than 2 standard deviations of the mean?

3.31 g
3.50 g
3.45 g
3.62 g
4.25 g

Question 6

Given the mass of a cylindrical solid was measured to be 135 grams. When submerged in 30.0 mL of water, the water level rose to 45.0 mL. Its density is

0.111 g/cm³
0.333 g/cm³
3.00 g/cm³
9.00 g/cm³
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densityquizA2.gif (6728 bytes)

Question 7

If the slope of the line shown on the graph above represents density, then the graph's title could have also been:

Mass vs Volume
Volume vs Mass
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Question 8

Calculate the slope of the line by choosing two gridpoints. Then choose the best numerical value from the list below.

17.5
16.9
16.7
16.0
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Question 9

If the slope of this graph represents density measured in g/cm³, extrapolate the value for the mass which corresponds to a volume of 1.50 cm³.

10.5 grams
24.0 grams
30.0 grams
There is no value for mass that pairs with a volume of 1.50 cm³
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Question 10

What is the correct volume reading for
the water level in the cylinder
shown to the right?

55.27 mL
55.5 mL
57.7 mL
57.75 mL
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