Unit 1 Practice Test

Question 1

What are SI units?

Answer 1

Systeme Internacionale units of measurement

Question 2

How many centimeters are in 2.3 meters?

Answer 2

230 cm

Question 3

Which of the following statements about SI distance units is not correct?

Answer 3

Converting a meter to feet is an example of a conversion involving two different SI units for distance.

Question 4

The conversion factor between inches and centimeters is: 1 in. = 2.540 cm. How many meters are in 4.00 feet?

Answer 4

1.22 m

Question 5

Which of the following uses a derived SI unit measurement?

Answer 5

speed

Question 6

Consider the function q=1/4*ct^3, where c is in units of m/s, and t is in units of seconds (s). What are the units of the function q?

Answer 6

m*s^2

Question 7

Which of the following statements about SI units is not correct?

Answer 7

The cgs system is not considered a standard SI system.

Question 8

Which of the following is not a unit of the metric system or Système International?

Answer 8

yard

Question 9

Suppose you are told that 1 qt = 0.946 L. Which of the following statements is not correct?

Answer 9

(1 qt/ 0.946 L)(365) = 365 qt/L

Question 10

One inch (in) is equal to 2.54 centimeters (cm). How many centimeters are in 12.0 inches?

Answer 10

30.5 cm

Question 11

Suppose you are told that 15 quarts (qt) = 14.2 liters (L). What is the conversion factor you would use to convert from quarts to liters? What is the conversion factor you would you use to convert liters to quarts?

Answer 11

quarts to liters: 14.2 L / 15 qt

liters to quarts: 15 qt / 14.2 L

Question 12

What is the magnitude of vector A?

Answer 12

6.00 cm

Question 13

Which of the following quantities is not a vector?

Answer 13

speed

example: 70 miles per hour

Question 14

A = -1/2B

Which of the following is incorrect?

Answer 14

the directions of A and B are the same

Question 15

The vector B is a scalar multiple of vector A. The magnitude of B is three times the magnitude of A. Which of the following vector equations describes the relationship between B and A?

Answer 15

A = 1/3B

Question 16

A toy train is moving on a track from right to left. You are told that work is the dot product of force and displacement. In what direction would you apply a force so that you do the most negative work on the train?

Answer 16

You would apply a force that is in the left to right direction

Question 17

The angle between two vectors is 175.0°. What is the scalar product of these two vectors if their magnitudes are 4.000 cm and 3.000 cm?

Answer 17

−11.95

Question 18

Which of the following statements about the dot product of the two vectors is not correct? Assume that one grid line is one unit.

Answer 18

The dot product of the two vectors is a positive value.