myTestBook.com Math Reading Science Practice Test for Grade 1, 2, 3, 4 & 5    
  you are taking the following test:

 
Grade: 7,    Subject: Math,    Topic: Multiplication and divison of numbers written in Scientific Nota
Question 1:
(1.4 × 106) × (1.2 × 103) = __?__

2.6 × 1092.6 × 104

1.7 × 1091.7 × 1018
 
Question 2:
(4.5×105) ÷ (1.5×103) = __?__

3 × 1083 × 102

3 × 10153 × 104
 
Question 3:
(2 × 103)(3 × 104) = __?__

5 × 1076 × 101

6 × 10126 × 107
 
Question 4:
The smallest known star in the universe is OGLE-TR-122b. It has a diameter of 8.29 × 103 km. The largest known star in the universe, VY Canis Majoris, is about 1.67 × 105 times larger than OGLE-TR-122b. What is the diameter of VY Canis Majoris?

2.38 × 109 km1.38 × 109 km

1.38 × 1011 km7.3 × 107 km
 
Question 5:
There are 3.2×108 virus in a sample vile. How many total number of virus will there be in 5,000 such vile?

16×10816.0×1012

1.6×10121.6×1011
 
Question 6:
= __?__

4 × 1074 × 1012

4 × 10−14 × 101
 
Question 7:
Find the quotient.

360,000,000 ÷ 0.0008

4.5 × 10104.5 × 1011

4.5 × 10124.5 × 109
 
Question 8:
Size of a Helium atom is 62 pico meter. If 105 Helium atoms are placed in a straight line, how long line will it make? (1 pico meter = 10−12 meter)

6.2 × 10−17 meter6.2 × 10−7 meter

62 × 10−6 meter6.2 × 10−6 meter
 
Question 9:
Weight of a Hydrogen atom is 1.66 × 10−27 kg. How many Hydrogen atoms are there in a container that has 8.3 × 10−3 kg of Hydrogen?

5 × 1024 atoms5 × 10−24 atoms

5 × 1027 atoms5 × 1030 atoms
 
Question 10:
(2 × 10 -3) (2 × 108) = __?__

4 × 1054 × 1011

4 × 10−54 × 106
 
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