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Compre Reviewer > Part I > Flashcards

Part I Flashcards

1
Q

Which of the following numbers has the greatest
number of significant figures?
a. 0.0402
b. 8.12 x 10^11
c. 34,000
d. 0.5000

A

D

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2
Q

Which of the following volumes is equal to 40
mL?
a. 0.40 L
b. 0.00040 kL
c. 40 dm3
d. 40 cm3

A

D

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3
Q

In three more years, Miguel’s grandfather will be
six times as old as Miguel was last year. When
Miguel’s present age is added to his grandfather’s
present age, the total is 68. How old is Miguel’s
grandfather?
a. at most 54
b. between 55 & 57
c. between 58 &61
d. at least 62

A

B

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4
Q

Working alone, Maria can complete a task
in 100 minutes. Shaniqua can complete the
same task in two hours. They work together
for 30 minutes when Liu, the new employee, joins
and begins helping. They finish the task 20
minutes later. How long would it take Liu to
complete the task alone?
a. 2.5 hrs
b. 3.0 hrs
c. 3.5 hrs
d. 4.0 hrs

A

D

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5
Q

The owner of a ranch decides to enclose a
rectangular region with 140 feet of fencing. To
help the fencing cover more land, he plans to use
one side of his barn as part of the enclosed
region. What is the maximum area the rancher
can enclose, in sq ft?
a. 2,350 sq ft
b. 2,450 sq ft
c. 2,550 sq ft
d. 2,650 sq ft

A

B

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6
Q

What is the slope of the curve f(x) = 2x + x2 at x = 3.
a. less than 5
b. between 5 and 10
c. between 10 and 15
d. more than 15

A

C

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7
Q

Consider 3 matrices A, B, and C, where A = BC.
Find a12.
􀀁 = [ 4 3 1 ] 􀀉 = 􀀊
3 2
4 0
2 1
􀀍
a. – 2
b. – 1
c. 3
d. 8

A

A

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8
Q

Assuming only two isotopes of Chlorine: 35Cl
(34.968852 amu) and 37Cl (36.965903 amu). If
atomic mass of chlorine is 35.453, find the %
abundance of 35Cl.
a. 72.2 %
b. 74.3 %
c. 75.8 %
d. 76.9 %

A

C

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9
Q

Mendeleev arranged the elements according to:
a. atomic weight and chemical reactivity.
b. atomic number and atomic weight.
c. electron configuration and atomic weight.
d. physical state and relative abundance.

A

A

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10
Q

Which of the following is NOT true about subatomic
particles?
a. protons, neutrons are found in nucleus
b. electrons have negative charges
c. mass of electron equals mass of proton
d. protons and electrons attract each other

A

C

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11
Q

How much does 100 million atoms of gold weigh
(MW: 196.97 g/mol)?
a. 5 x 10¯15 g
b. 4 x 10¯12 g
c. 3 x 10¯14 g
d. 2 x 10¯13 g

A

C

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12
Q

If there is 35.0 grams of C6H10 and 45.0 grams
of O2, how many grams of the excess reagent
will remain after the reaction ceases?
2C6H10 + 17O2 —> 12CO2 + 10H2O
a. 15.1 g
b. 16.5 g
c. 19.9 g
d. 21.3 g

A

A

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13
Q

Exactly 2.00 L of a gas is collected at 25.0°C and
745.0 mmHg. What is the volume at STP?
a. 1.8 L
b. 1.9 L
c. 2.1 L
d. 2.2 L

A

A

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14
Q

What is the molality of ethanol in a solution made
by dissolving 14.6 g of ethanol, C2H5OH, in 53.6
g of water?
a. 5.92 m
b. 272 m
c. 0.00592 m
d. 0.272 m

A

A

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15
Q

How many grams of Ca(OH)2 are needed to
make 100.0 mL of 0.250 M solution? MW of
Ca(OH)2 is 74.09 g/mol.
a. less than 1.40 g
b. 1.40 g – 1.60 g
c. 1.60 g to 1.80 g
d. more than 1.80 g

A

D

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16
Q

Find tension in wire 2.
a. about 40 N
b. about 50 N
c. about 60 N
d. about 70 N

A

B

17
Q

Determine force F required to keep the 250 kN
package from sliding down the plane? Coefficient
of friction is μ = 0.15.
a. 15 kN
b. 35 kN
c. 65 kN
d. 120 kN

A

D

18
Q

What is the magnitude of force exerted by
support B?
a. 1.5 kN
b. 2.3 kN
c. 2.6 kN
d. 3.5 kN

A

C

19
Q

Find the force on the member CD below.
a. 318 lb (T)
b. 318 lb (C)
c. 225 lb (T)
d. 225 lb (C)

A

A

20
Q

A train moving with constant acceleration travels
at 24 ft/s during the 10th sec of its motion and 18
ft/s during the 12th sec of its motion. Find its
constant acceleration.
a. – 5 m/s2
b. – 4 m/s2
c. – 3 m/s2
d. – 2 m/s2

A

C

21
Q

A missile is launched into the air. When it reaches
1000m, the engine fails with the missile having
(upward) velocity of 80 m/s. How fast is it going
when it hits the ground?
a. 140 m/s
b. 150 m/s
c. 160 m/s
d. 170 m/s

A

C

22
Q

Which of the following is NOT true for a projectile
released from the ground and thrown at initial
velocity with magnitude 20 m/s and with angle
above horizontal of 30°? Use g = -10 m/s2.
a. maximum height reached before falling
down is 10 m.
b. initial vertical component of velocity is 10
m/s upward.
c. when it reaches the ground, magnitude of
final velocity is 20 m/s.
d. horizontal component of velocity is
constant through time.

A

A

23
Q

A ball hits on a floor from a height of 20 m. Which
of the following is NOT true about its potential (PE
= mgh, h = 0 at ground) and kinetic energy (KE =
0.5mv2)? Assume g = 10 m/s2.
a. At h = 10 m, PE = KE.
b. Just before it hits the floor, KE is highest.
c. Its velocity when it reaches the floor is 20
m/s.
d. As the book falls down, PE is increasing.

A

D

24
Q

A man can exert
a maximum pull
of 1,000 N but
wishes to lift a
new stone door
for his cave
weighing 20,000N. If he uses lever how much closer must the
fulcrum be to the stone than to his hand.
a. 10x nearer
b. 20x farther
c. 10x farther
d. 20x nearer

A

D

25
Q

Which of the following is true about the figure?
Assume the system is at rest.
a. Static friction between block and table
equals the weight w.
b. The magnitude of tensions in the three
strings are equal.
c. Weight w is larger than weight of block A.
d. The friction force on the table by block A is directed to the left.

A

A

26
Q

How many of the items below are not in
equilibrium?
o A parachute moving downwards at a
constant speed.
o An elevator slowing down as it reaches the
next floor.
o A stationary book on an inclined desk.
a. 0
b. 1
c. 2
d. 3

A

B

27
Q

A 0.05 kg bullet hits a book at an initial velocity of
40 m/s. It penetrates the book 4 cm before it
stops. Assuming constant acceleration, for how
long did the force by the book on the bullet last?
a. around 0.002 s
b. around 0.020 s
c. around 0.200 s
d. around 2.000 s

A

A

28
Q

A 65-kg student A sits 4 m away from a 50-kg
student B. Where should a third student sit so that
the gravitational forces exerted by the other two
students acting on this new student are cancelled
out? Recall: F = Gm1m2/r2.
a. about 2.15 m from A
b. about 2.25 m from A
c. about 2.35 m from A
d. about 2.45 m from A

A

A

29
Q

A spring is compressed by 0.02 m. Given a spring
constant of 20 kN/m, what is the stored potential
energy of the said spring?
a. 4 J
b. 8 J
c. 200 J
d. 400 J

A

A

30
Q

Which of the following correctly defines the 500
N force that passes from A(4, 0, 3) to B(0, 6, 0)?
a. 256i - 384j + 192k N
b. -256i + 384j - 192k N
c. -384i + 192j - 256k N
d. 384i - 192j + 256k N

A

B

Compre Reviewer (8 decks)

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