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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 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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