# Chapter 1: MEASUREMENT

- The SI standard of time is based on:
- the daily rotation of the earth
- the frequency of light emitted by Kr
^{86} - the yearly revolution of the earth about the sun
- a precision pendulum clock
- none of these
**Ans:E**

- A nanosecond is:
- 10
^{9}s - 10
^{−9}s - 10
^{−10}s - 10
^{−10}s - 10
^{−12}

- 10

**Ans: B**

- The SI standard of length is based on:
- the distance from the north pole to the equator along a meridian passing through Paris
- wavelength of light emitted by Hg
^{198} - wavelength of light emitted by Kr
^{86} - a precision meter stick in Paris
- the speed of light
**Ans: E**

- In 1866, the U. S. Congress defined the U. S. yard as exactly 3600
*/*3937 international meter. This was done primarily because:- length can be measured more accurately in meters than in yards
- the meter is more stable than the yard
- this definition relates the common S. length units to a more widely used system
- there are more wavelengths in a yard than in a meter
- the members of this Congress were exceptionally intelligent

**Ans: C**

- Which of the following is closest to a yard in length? A. 0
*.*01 m - 0
*.*1m - 1 m
- 100 m
- 1000 m

**Ans: C**

- There is no SI base unit for area because:
- an area has no thickness; hence no physical standard can be built
- we live in a three (not a two) dimensional world
- it is impossible to express square feet in terms of meters
- area can be expressed in terms of square meters
- area is not an important physical quantity
**Ans: D**

- The SI base unit for mass is:
- gram
- pound
- kilogram
- ounce
- kilopound
**Ans: C**

- A gram is:
- 10
^{−6}kg - 10
^{−3}kg - 1 kg
- 10
^{3}kg - 10
^{6}kg

- 10

**Ans: B**

- Which of the following weighs about a pound?
- 0
*.*05 kg - 0
*.*5 kg - 5 kg
- 50 kg
- 500 kg

- 0

**Ans: D**

- 5
*.*0 × 10^{5}+ 3*.*0 × 10^{6}= - 8
*.*0 × 10^{5} - 8
*.*0 × 10^{6} - 5
*.*3 × 10^{5} - 3
*.*5 × 10^{5} - 3
*.*5 × 10^{6}

**Ans: E**

- The number of significant figures in 0
*.*00150 is:- 2
- 3
- 4
- 5
- 6

**Ans: B**

- The number of significant figures in 15
*.*0 is:- 1
- 2
- 3
- 4
- 5

**Ans: C**

- 3
*.*2 × 2*.*7 =

- 9
- 8
- 8
*.*6 - 8
*.*64 - 8
*.*640

**Ans: C**

- 1
*.*513 + 27*.*3 =

A. | 29 |

B. | 28 |

C. | 28 |

D. | 28 |

E. | 28 |

( | ) |

- 1 mi is equivalent to 1609 m so 55 mph is:
- 15 m/s
- 25 m/s
- 66 m/s
- 88 m/s
- 1500 m/s
**Ans: B**

- A right circular cylinder with a radius of 2
*.*3 cm and a height of 1*.*4 m has a volume of: A. 0*.*20 m^{3} - 0
*.*14 m^{3} - 9
*.*3 × 10^{−3}m^{3} - 2
*.*3 × 10^{−3}m^{3} - 7
*.*4 × 10^{−4}m^{3}

**Ans: D**

- A right circular cylinder with a radius of 2
*.*3 cm and a height of 1*.*4 cm has a total surface area of: - 1
*.*7 × 10^{−3}m^{2} - 3
*.*2 × 10^{−3}m^{2} - 2
*.*0 × 10^{−3}m^{3} - 5
*.*3 × 10^{−3}m^{2} - 7
*.*4 × 10^{−3}m^{2}

**Ans: D**

- A cubic box with an edge of exactly 1 cm has a volume of: A. 10
^{−9}m^{3} - 10
^{−6}m^{3} - 10
^{−3}m^{3} - 10
^{3}m^{3} - 10
^{6}m^{3}

**Ans: B**

- A square with an edge of exactly 1 cm has an area of: A. 10
^{−6}m^{2} - 10
^{−4}m^{2} - 10
^{2}m^{2} - 10
^{4}m^{2} - 10
^{6}m^{2}

**Ans: B**

- Suppose
*A*=*BC*, where*A*has the dimension L/M and*C*has the dimension L/T. Then*B*

has the dimension:

- T/M
- L
^{2}/TM - TM/L
^{2} - L
^{2}T/M - M/L
^{2}T

**Ans: A**