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 × 109 2.6 × 104 1.7 × 109 1.7 × 1018
 Question 2: (4.5×105) ÷ (1.5×103) = __?__ 3 × 108 3 × 102 3 × 1015 3 × 104
 Question 3: (2 × 103)(3 × 104) = __?__ 5 × 107 6 × 101 6 × 1012 6 × 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 km 1.38 × 109 km 1.38 × 1011 km 7.3 × 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? 16×108 16.0×1012 1.6×1012 1.6×1011
 Question 6: = __?__ 4 × 107 4 × 1012 4 × 10−1 4 × 101
 Question 7: Find the quotient. 360,000,000 ÷ 0.0008 4.5 × 1010 4.5 × 1011 4.5 × 1012 4.5 × 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 meter 6.2 × 10−7 meter 62 × 10−6 meter 6.2 × 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 atoms 5 × 10−24 atoms 5 × 1027 atoms 5 × 1030 atoms
 Question 10: (2 × 10 -3) (2 × 108) = __?__ 4 × 105 4 × 1011 4 × 10−5 4 × 106