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Question 1
What is the 50% of 2.5 × 10−4?
A. 1.25 × 10−2B. 2.25 × 10−4
C. 1.25 × 10−4D. 5.0 × 10−2
Question 2
0.0001 × 3.23 × 10−2 = ________
A. 3.23 × 10+2B. 3.23 × 10+4
C. 323.0 × 10−6D. 3.23 × 10−6
Question 3
A 2.3 × 10−3 cm long nano fiber is divided into 100 parts. What is the length of a divided part?
A. 2.3 × 10−2 cmB. 2.3 × 10−5 cm
C. 2.3 × 10−6 cmD. 0.23 × 10−5 cm
Question 4
Old semiconductor technology was capable of producing 90 × 10−9 m wide lines. Latest technology has further reduced the width by 50%. How wide lines can be produced now?
A. 45 × 10−9 mB. 90 × 10−9 m
C. 2.5 × 10−9 mD. 35 × 10−9 m
Question 5
Light takes about 5.4 × 10−6 seconds to travel one mile in a vacuum. How long will it take the light to travel only one twentieth of a mile?
A. 5.4 × 10−7 secondsB. 2.7 × 10−7 seconds
C. 2.7 × 10−6 secondsD. 2.7 × 10−5 seconds
Question 6
4.5 × 10−7 × 2.0 × 10+4 = __________
A. 3.5 × 10−11B. 3.5 × 10−3
C. 9.0 × 10−3D. 9.0 × 10−28
Question 7
What is two seventh of 2.8 × 10−6?
A. 4.0 × 10−7B. 0.8 × 10−6
C. 8.0 × 10−7D. 8.0 × 10−6
Question 8
A strobe light flashes for one microsecond and then pauses for one microsecond in one flash cycle. Calculate time to complete 10,000 cycles?

one microsecond = 10−6 second,
one millisecond = 10−3 second.
A. 20 millisecondB. 1 millisecond
C. 100 microsecondD. 20 microsecond
Question 9
What is 6% of 3.9 × 10−4?
A. 2.34 × 10−3B. 2.34 × 10−7
C. 2.34 × 10−5D. 2.34 × 10−6
Question 10
What is two-third of 60% of 5.7 × 10−8?
A. 1.14 × 10−9B. 3.42 × 10−8
C. 2.28 × 10−9D. 2.28 × 10−8
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