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Grade:
8
, Subject:
Math
, Topic:
Number and Number Sense Negative exponents and manipulation
Question 1:
What is the 50% of 2.5 × 10
−4
?
1.25 × 10
−2
2.25 × 10
−4
1.25 × 10
−4
5.0 × 10
−2
Question 2:
0.0001 × 3.23 × 10
−2
= ________
3.23 × 10
+2
3.23 × 10
+4
323.0 × 10
−6
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?
2.3 × 10
−2
cm
2.3 × 10
−5
cm
2.3 × 10
−6
cm
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?
45 × 10
−9
m
90 × 10
−9
m
2.5 × 10
−9
m
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?
5.4 × 10
−7
seconds
2.7 × 10
−7
seconds
2.7 × 10
−6
seconds
2.7 × 10
−5
seconds
Question 6:
4.5 × 10
−7
×
2.0 × 10
+4
= __________
3.5 × 10
−11
3.5 × 10
−3
9.0 × 10
−3
9.0 × 10
−28
Question 7:
What is two seventh of 2.8 × 10
−6
?
4.0 × 10
−7
0.8 × 10
−6
8.0 × 10
−7
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.
20 millisecond
1 millisecond
100 microsecond
20 microsecond
Question 9:
What is 6% of 3.9 × 10
−4
?
2.34 × 10
−3
2.34 × 10
−7
2.34 × 10
−5
2.34 × 10
−6
Question 10:
What is two-third of 60% of 5.7 × 10
−8
?
1.14 × 10
−9
3.42 × 10
−8
2.28 × 10
−9
2.28 × 10
−8
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