you are taking the following test:

Grade: 8,    Subject: Math,    Topic: Computation and Estimation Square and square roots Cube
 Question 1: Square of 12.5 will lie between _____________. 169 and 225 14 and 16 144 and 169 125 and 140
 Question 2: Square root of 420 will lie between __________. 20 and 21 21 and 22 19 and 20 40 and 42
 Question 3: Simplify    √1125 15 × √5 9 × √5 25 × √5 5 × √5
 Question 4: A submarine periscope can see distance d (in miles) if the height of the periscope from the water surface is h (in feet). The relationship between d and h is d = 1.4 √h . Calculate the distance a sailor can see if he lifts the periscope 16 feet above the water? 3.2 miles 22.4 miles 4 miles 5.6 miles
 Question 5: Velocity v (in meter/sec) of a free falling object after travelling the distance d (in meter) is defined as    v = √64 × d . What will be the speed of an object that has travelled 100 meter after being dropped? 16 meter/sec 8 meter/sec 80 meter/sec 64 meter/sec
 Question 6: Calculate the value of √3 × 3 × 5 × 5 × 5 × 5 . 250 150 75 125
 Question 7: What is the value of √3 × 7 × √3 × 5 × √5 × 7. 10605 105 147 49
 Question 8: One person can dig a 2m × 2m × 2m hole in one hour. How long will he take to dig a 6m × 6m × 6m hole? 12 hours 32 hours 36 hours 27 hours
 Question 9: Cost of constructing marble floor is \$25 per square feet. How much will it cost to lay marble on a square surface with 12 feet sides? \$300 \$6,250 \$3,600 \$2,500
 Question 10: The total cost of polishing a square surface is \$101,430. Cost per sq feet is \$230. What is the length and width of the square surface? 20 feet 21 feet 23 feet 11 feet
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