myTestBook.com Math Reading Science Practice Test for Grade 1, 2, 3, 4 & 5    
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Grade: 8,    Subject: Math,    Topic: Computation and Estimation Square and square roots Cube
Question 1:
Square of 12.5 will lie between _____________.

169 and 22514 and 16

144 and 169125 and 140
 
Question 2:
Square root of 420 will lie between __________.

20 and 2121 and 22

19 and 2040 and 42
 
Question 3:
Simplify    √1125

15 × √59 × √5

25 × √55 × √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 miles22.4 miles

4 miles5.6 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/sec8 meter/sec

80 meter/sec64 meter/sec
 
Question 6:
Calculate the value of

3 × 3 × 5 × 5 × 5 × 5 .

250150

75125
 
Question 7:
What is the value of

3 × 7 × √3 × 5 × √5 × 7.

10605105

14749
 
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 hours32 hours

36 hours27 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 feet21 feet

23 feet11 feet
 
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