Question 1

The density of seawater was measured to be 1.07 g/cm3. This density in SI units is

Accepted Answer

A)  1.07*10-3 kg/m3 
B)  1/1.07) *103 kg/m3 
C)  1.07 * 103 kg 
D)  1.07 *10-3 kg 
E)  1.07 * 103 kg/m3

Question 2

If v and t represent velocity and time, respectively, C2 in   must

Accepted Answer

A)  have the dimensions ML/T 2. 
B)  have the dimensions  . 
C)  have the dimensions L/T 2. 
D)  have the dimensions L2/T 2. 
E)  be dimensionless.

Question 3

If x and t represent distance and time, respectively, the C in x = 1/2Ct 2 must

Accepted Answer

A)  have the dimensions ML/T 2. 
B)  have the dimensions M. 
C)  have the dimensions L/T 2. 
D)  have the dimensions L2/T 2. 
E)  be dimensionless.

Question 4

The prefix "micro" means

Accepted Answer

A)  10-12. 
B)  10-6.  
C)  10-3.  
D)  10-2. 
E)  10-1.

Question 5

Light travels at 3 *108 m/s, and the size of a proton is about 1 fm. Calculate the order of magnitude for the time taken for light to pass across a proton.

Accepted Answer

A)   s 
B)   s 
C)   s 
D)   s 
E)   s

Question 6

In doing a calculation, you arrive at an expression in which the numerator is in kilometers and the denominator is in meters per second. When the calculation is completed, the result will be in units of

Accepted Answer

A)  meters, if you divide by 1000. 
B)  meters, if you multiply by 1000. 
C)  seconds, if you divide by 1000. 
D)  seconds, if you multiply by 1000. 
E)  meters squared per second, if you multiply by 1000.

Question 7

The fundamental physical quantities are

Accepted Answer

A)  mass, length, time, temperature, amount of a substance, current, and luminous intensity. 
B)  weight, length, time, temperature, amount of a substance, current, and luminous intensity. 
C)  mass, length, time, temperature, force, current, and luminous intensity. 
D)  mass, length, time, force, momentum, amount of a substance, and current. 
E)  weight, length, time, temperature, amount of a substance, potential energy, and luminous intensity.

Question 8

Earth's population, expressed as an order of magnitude, is closest to

Accepted Answer

A)  106. 
B)  1010. 
C)  105. 
D)  108. 
E)  107.

Question 9

If you have a music CD collection of about 150 discs, estimate the order of magnitude of the number of heartbeats you would have if you listened all the way through your collection.

Accepted Answer

A)  106 
B)  108 
C)  1010 
D)  104 
E)  103

Question 10

Estimate the number of raindrops needed to fill a volume of 1m * 1m*1cm.

Accepted Answer

A)  103 
B)  105 
C)  107 
D)  109 
E)  1011

Question 11

The net force acting on a body is defined to be the product of the mass of the body and its resultant acceleration. If the mass of a body is known to be 184 kg and its acceleration is measured to be 2.4 m/s2, the resultant force should be reported as

Accepted Answer

A)  4.4 * 102 kg · m/s2. 
B)  441.6 kg · m/s2. 
C)  442 kg · m/s2. 
D)  4.416 kg · m/s2. 
E)  4.42 * 102 kg · m/s2.

Question 12

In the expression Fnet = ma, m must have the dimensions

Accepted Answer

A)  ML/T 2.  
B)  M. 
C)  L/T 2.  
D)  L/T. 
E)  ML2/T 2.

Question 13

An impurity in a manufacturing process will cause a batch to be rejected if the impurity exceeds one part per million. What is the maximum amount of impurity that could be present if the batch contains 100 kg of the product?

Accepted Answer

A)  100 micrograms 
B)  100 Nanograms 
C)  100 grams 
D)  100 megagrams 
E)  100 nanograms

Question 14

The dimensions of energy, E, are ML2/T 2. Using dimensional analyzes, E is the product of which two quantities?

Accepted Answer

A)  Mass divided by time squared 
B)  Force times acceleration 
C)  Mass times acceleration 
D)  Force times distance 
E)  Force times time

Question 15

To convert a quantity from km/h · s) to m/s2, you must

Accepted Answer

A)  multiply by 1000 and divide by 60. 
B)  multiply by 1000 and divide by 3600. 
C)  multiply by 60 and divide by 1000. 
D)  multiply by 3600 and divide by 1000. 
E)  None of these options are correct.

Question 16

Which of the following is NOT one of the fundamental physical quantities in the SI system?

Accepted Answer

A)  mass 
B)  length 
C)  force 
D)  time 
E)  All of these are fundamental physical quantities in the SI system.

Question 17

When we look up in the sky the Sun appears about as big as the moon; however, we know that the Sun is much further away. Given that the radius of the Sun is about 7 * 108 m and that the radius of the moon is about 2 * 106 m, calculate approximately the number of times the moon could fit inside the Sun.

Accepted Answer

A)  4 * 102  
B)  4 * 106  
C)  4 * 107  
D)  1 * 105  
E)  2 *105

Question 18

Which of the following is NOT one of the fundamental units in the SI system?

Accepted Answer

A)  Newton 
B)  meter 
C)  kilogram 
D)  second 
E)  All of these choices are fundamental units in the SI system

Question 19

Which of the following is a fundamental unit of the SI system of units?

Accepted Answer

A)  kilometer 
B)  joule 
C)  kilogram 
D)  gram 
E)  newton

Question 20

If x and t represent position and time, respectively, the A in x = A cos Bt) must

Accepted Answer

A)  have the dimensions ML/T 2. 
B)  have the dimensions M. 
C)  have the dimensions L. 
D)  have the dimensions L2/T 2. 
E)  be dimensionless.

Exam 1: Introduction to Physics

The density of seawater was measured to be 1.07 g/cm³. This density in SI units is

If v and t represent velocity and time, respectively, C₂ in must

If x and t represent distance and time, respectively, the C in x = ¹/2Ct ² must

The prefix "micro" means

Light travels at 3 *10⁸ m/s, and the size of a proton is about 1 fm. Calculate the order of magnitude for the time taken for light to pass across a proton.