Quantitative Aptitude - Arithmetic Ability Questions

Q:

Two men are on opposite sides of a tower. They measure the angles of elevation of the top of the tower as 30 ̊ and 45 ̊ respectively. If the height of the tower is 50 m, the distance between the two men is (Take √3 = 1.73)

A) 136.5 m B) 50 √3 m
C) 100 √3 m D) 135.5 m
 
Answer & Explanation Answer: A) 136.5 m

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Q:

The top of a broken tree touches the ground at a distance of 15 m from its base. If the tree is broken at a height of 8 m from the ground, then the actual height of the tree is

A) 17 m B) 27 m
C) 25 m D) 30 m
 
Answer & Explanation Answer: C) 25 m

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Q:

If M = 0.1 + (0.1)2 + (0.01)2 and N = 0.3 + (0.03)2 + (0.003)2, then what is the value of M + N?

A) 0.411009 B) 0.413131
C) 0.313131 D) 0.131313
 
Answer & Explanation Answer: A) 0.411009

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Q:

What is the value of [tan (90  A) + cot (90  A)]2/[2 sec2(90  2A)]?

A) 0 B) 1
C) 2 D) – 1
 
Answer & Explanation Answer: C) 2

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Q:

What is the slope of the line perpendicular to the line passing through the points (8,­2) and (3,­1)?

A) 5 B) 3/5
C) 5/3 D) 1/5
 
Answer & Explanation Answer: A) 5

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Q:

If the circumference of a circle is 44 cm, then what must be its area (in cm²)?

A) 308 B) 240
C) 154 D) 480
 
Answer & Explanation Answer: C) 154

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Q:

Two circles touch externally. The sum of their areas is 130π sq.cm and the distance between their centers is 14 cm. The radius of the bigger circle is

A) 22 cm B) 11 cm
C) 33 cm D) 44 cm
 
Answer & Explanation Answer: B) 11 cm

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Q:

A cube is inscribed in a sphere. A right circular cylinder is within the cube touching all the vertical faces. A right circular once is inside the cylinder. Their heights are same and the diameter of the cone is equal to that of the cylinder.

What is the ratio of the volume of the sphere to that of cone?

A) 6√3:1 B) 7 : 2
C) 3√3:1   D) 5√3:1
 
Answer & Explanation Answer: A) 6√3:1

Explanation:
The top view of the given assembly will look like the figure above
Outermost is the sphere. Inside that there is a cube and within that there is a cone and cylinder with same radius.
Here side of cube = a
Diameter of Sphere = body diagnol = √3 a
Radius of sphere = √3 a/2 =r1
Height of Cylinder = Height of cone = side of cube = a =h
Radius of cylinder = Radius of cone = side of cube/2 = a/2 =r2(as shown in the figure)
Volume of sphere/volume of cone = 43πr1313πr22h = 6√3:1
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Filed Under: Volume and Surface Area
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