This is the Multiples Choice Questions Part 1 of the Series in System of Numbers and Conversion as one of the Engineering Mathematics topic. In Preparation for the ECE Board Exam make sure to expose yourself and familiarize in each and every questions compiled here taken from various sources including but not limited to past Board Examination Questions in Engineering Mathematics, Mathematics Books, Journals and other Mathematics References.

### Multiple Choice Questions Topic Outline

- MCQs in Systems of Numbers | MCQs in Cardinal and Ordinal Numbers | MCQs in Numerals and Digit | MCQs in Real Numbers | MCQs in Imaginary Number | MCQs in Complex Number | MCQs in Fractions | MCQs in Composite Numbers | MCQs in Prime Numbers | MCQs in Perfect Number | MCQs in Defective and Abundant Numbers | MCQs in Amicable Numbers | MCQs in Factorial | MCQs in Significant Figures | MCQs in Rounding and Truncation

### Online Questions and Answers in System of Numbers and Conversion Series

Following is the list of multiple choice questions in this brand new series:

**System of Numbers and Conversion MCQs**

**MCQs from Number 1 – 50**Answer key:

**PART I**

**MCQs from Number 51 – 100**Answer key:

**PART II**

**MCQs from Number 101 – 150**Answer key:

**PART III**

### Start Practice Exam Test Questions Part I of the Series

**Choose the letter of the best answer in each questions.**

**Problem 1: ME Board October 1996**

How many significant digits do 10 097 have?

- A. 2
- B. 3
- C. 4
- D. 5

**Problem 2: ECE Board April 1991**

Round off 0.003086 to three significant figures.

- A. 0.003
- B. 0.00309
- C. 0.0031
- D. 0 00308

**Problem 3: ECE Board April 1991**

Round off 34.2814 to four significant figures.

- A 34 2814
- B. 34.281
- C. 34.28
- D 34.0

**Problem 4: ME Board April 1996**

Which number has three significant figures?

- A. 0.0014
- B. 1.4141
- C. 0.01414
- D. 0.0141

**Problem 5: ECE Board April 1991**

Round off 149.691 to the nearest integer

- A. 149.69
- B. 149.7
- C. 150
- D 149

**Problem 6: ECE Board April 1991**

Round off 2.371 x 108 to two significant figures.

- A. 2.4 x 10-8
- B. 2.37 x 10-8
- C 0.2371 x 10-9
- D. 0.002371 x 10-11

**Problem 7: EE Board October 1994**

7 + 0i is

- A. irrational number
- B. real number
- C. imaginary number
- D. a variable

**Problem 8: ECE Board March 1996**

The number 0.123123123123 .. . is

- A. irrational
- B. surd
- C. rational
- D. transcendental

**Problem 9: ECE Board April 1991**

Round off 6785768.342 to the nearest one-tenth.

- A. 6785768
- B 6785768.4
- C. 6785768.3
- D None of these

**Problem 10: EE Board April 1993**

Express decimally. Fourteen Ten thousandths

- A. 0.0014
- B. 0.00014
- C 0.014
- D 0.14

**Problem 11: ECE Board March 1996**

MCMXCIV is equivalent to what number?

- A. 1964
- B. 1994
- C. 1984
- D. 1974

**Problem 12: EE Board April 1993**

Express decimally: Fourty-Sevenmillionth

- A. 0 00000047
- B. 0.0000047
- C. 0.000047
- D. 0.000000047

**Problem 13: EE Board April 1993**

Express decimally: Seven hundred twenty-five hundred thousandths

- A. 0.000725
- B. 0.00725
- C. 0.0725
- D. 0.725

**Problem 14: EE Board April 1993**

Express decimally: Four and two tenth

- A. 0.042
- B. 4.02
- C. 4.2
- D 0.42

**Problem 15: ECE Board November 1995**

Express 45° in mils

- A. 80 mile
- B. 800 mils
- C. 8000 mils
- D. 80000 mils

**Problem 16: ME Board April 1997**

What is the value in degrees of 1 radian?

- A. 90
- B. 57.3
- C. 100
- D. 45

**Problem 17: CE Board May 1993**

3200 mils is equal to how many degrees?

- A. 45°
- B. 90°
- C. 180°
- D. 270°

**Problem 18: ECE Board November 1995**

An angular unit equivalent to 1/400 of the circumference of a circle is called

- A. mil
- B. degree
- C radian
- D. grad

**Problem 19: ECE Board April 1999**

4800 mils is equivalent to _____ degrees.

- A. 135
- B. 270
- C. 235
- D. 142

**Problem 20: ME Board April 1996**

How many degrees Celsius is 100 degrees Fahrenheit?

- A. 2.667° C
- B. 1.334′ C
- C. 13.34° C
- D. 37.8° C

**Problem 21: EE Board October 1990**

What is the absolute temperature of the freezing point of water in degree Rankine?

- A. 492
- B. 0
- C. 460
- D. 273

**Problem 22: ME Board October 1994**

What is the Fahrenheit equivalent of 100 degrees Celsius?

- A. 200
- B. 180
- C. 212
- D. 100

**Problem 23: EE Board April 1993**

The temperature 45° C is equal to

- A. 45° F
- B. 113° F
- C. 57° F
- D 81° F

**Problem 24: ME Board October 1994**

How many degrees Celsius is 80 degrees Fahrenheit?

- A. 13.34
- B. 1.334
- C. 26.67
- D. 2.667

**Problem 25: ME Board October 1996**

10 to the 12th power is the value of the prefix

- A. micro
- B. femto
- C. teta
- D. atto

**Problem 26: EE Board October 1994**

The micro or µ means

- A. 10-2
- B. 10-6
- C. 10-3
- D 10-12

**Problem 27: RME Board October 1994**

The prefix pico means

- A. 10-12 of a unit
- B. 10-6 of a unit
- C. 10-15 of a unit
- D. 10-9 of a unit

**Problem 28: ME Board April 1999**

The prefix nano is opposite to

- A. mega
- B. giga
- C. tera
- D hexa

**Problem 29:**

1 foot is to 12 inches as 1 yard is to spans.

- A. 4
- B. 6
- C. 9
- D. 24

**Problem 30: EE Board June 1990**

A one-inch diameter conduit is equivalent to

- A. 254 mm
- B. 25.4 mm
- C. 100 mm
- D. 2 54 mm

**Problem 31:**

If a foot has 12 inches. then how many hands are there in one foot?

- A. 3
- B. 4
- C. 6
- D. 8

**Problem 32:**

How many feet difference is 1 nautical mile and 1 statute mile?

- A. 100 feet
- B. 200 feet
- C. 400 feet
- D.

**Problem 33:**

In a hydrographic survey, a certain point below the surface of the water measures 12 fathoms. It is equivalent to a deep of how many feet?

- A. 72
- B. 60
- C. 48
- D. 36

**Problem 34:**

The legendary ship, Titanic that slink in 1912 was estimated to be at the sea bottom at a deep of 18 cables. How deep it is in feet?

- A. 12,000
- B. 12.343
- C. 12,633
- D. 12,960

**Problem 35: ME Board October 1994**

How many square feet is 100 square meters?

- A 328.1
- B. 929
- C. 32.81
- D. 1076

**Problem 36:**

A certain luxury ship cruises Cebu to Manila at 21 knots. If it will take 21 hours to reach Manila from Cebu. the distance travelled by the ship is nearly

- A. 847 5 km
- B. 507.15 statute mile
- C. 441 statute mile
- D. 414 nautical mile

**Problem 37: EE Board October 1994**

Carry out the following multiplication and express your answer in cubic meter: 8 cm x 5 mm x 2m.

- A. 8 x 10-2
- B. 8 x 102
- C. 8 x 10-3
- D. 8 x 10-4

**Problem 38:**

Which of the following is equivalent to 1 hectare?

- A. 100 ares
- B. 2 acres
- C. 1000 square meters
- D. 50000 square feet

**Problem 39:**

Ten square statute miles is equivalent to sections.

- A. 100
- B. 5
- C. 10
- D. 20

**Problem 40:**

The land area of the province of Cebu is 5088.39 sq. km. This is equivalent to

- A. 5088.39 hectares
- B. 1964.64 sq. miles
- C. 2257907.2 acres
- D. 5.08839 acres

**Problem 41: ME Board October 1994**

How many cubic feet is 100 gallons of liquid?

- A. 74.80
- B. 1.337
- C. 13.37
- D. 133.7

**Problem 42: ME Board October 1994, ME Board April 1998**

How many cubic meters is 100 gallons of liquid?

- A. 1.638
- B. 3.785
- C. 0.164
- D. 0.378

**Problem 43: ME Board October 1994**

How many cubic meters is 100 cubic feet of liquid?

- A. 3.785
- B. 28.31
- C. 37.85
- D. 2.831

**Problem 44:**

Ten (10) cubic meter is equivalent to how many stere?

- A. 5
- B. 10
- C. 20
- D. 100

**Problem 45: ME Board April 1995**

The standard acceleration due to gravity is

- A. 32.2 ft/s2
- B. 980 ft/s2
- C. 58.3 ft/s2
- D. 35.3 ft/s2

**Problem 46: ME Board October 1996**

A 7 kg mass is suspended in a rope. What is the tension in the rope in SI?

- A. 68.67 N
- B. 70 N
- C. 71 N
- D. 72 N

**Problem 47:**

A 10-liter pail is full of water. Neglecting the weight of the pail, how heavy is its water content?

- A. 5 kg
- B. 6.67 kg
- C. 10 kg
- D. 12.5 kg

**Problem 48:**

The unit of work in the mks system is known as joule (J) and the unit of work in the cgs system is erg. How many ergs are there in one joule?

- A. 106
- B. 107
- C. 105
- D. 104

**Problem 49: ME Board April 1998**

One horsepower is equivalent to

- A. 746 watts
- B. 7460 watts
- C. 74.6 watts
- D. 7.46 watts

**Problem 50: ME Board October 1994**

How many horsepower is 746 kilowatts?

- A. 500
- B. 74.6
- C. 100
- D. 1000