46
Q:

The diagonal of a rectangle is sqrt(41) cm.  and its area is 20 sq. cm. The perimeter of the rectangle must be:

A) 9 cm B) 18 cm
C) 20 cm D) 41 cm

Answer:   B) 18 cm



Explanation:

l2+b2 = diagonal2=40

Also, lb=20

 

l+b2=l2+b2+2lb = 41 + 40 =81 

(l + b) = 9.

Perimeter = 2(l + b) = 18 cm.

Q:

What happens to the volume (V) of the cuboid. if its length is doubled. height is doubled and breadth is kept the same?

 

A) V B) V/2
C) 4V D) 2V
 
Answer & Explanation Answer: C) 4V

Explanation:
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0 129
Q:

Find the total surface area (in sq.cm) of a right circular cylinder of diameter 21 cm and height 10 cm.

 

A) 1353   B) 1287  
C) 1678   D) 1728
 
Answer & Explanation Answer: A) 1353  

Explanation:
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4 877
Q:

Find the area and circumference of a circle if the radius is 14 cm. (Take pi = 22/7)

 

A) Area = 44 sq.cm; circumference = 308 cm B) Area = 616 sq.cm; circumference = 88 cm
C) Area = 88 sq.cm; circumference = 616 cm D) Area = 308 sq.cm; circumference = 44 cm
 
Answer & Explanation Answer: B) Area = 616 sq.cm; circumference = 88 cm

Explanation:
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1 1283
Q:

Find the curved surface area (in cm2) of a right circular cylinder of diameter 21 cm and height 10 cm.

 

A) 594   B) 530  
C) 472   D) 660
 
Answer & Explanation Answer: D) 660

Explanation:
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0 816
Q:

The length, breadth and height of a cuboidal box are in the ratio 7 : 5 : 3 and its whole surface area is 27832 sq.cm. Its volume is:

 

A) 288120 cub.cm B) 280120 cub.cm
C) 208120 cub.cm D) 288100 cub.cm
 
Answer & Explanation Answer: A) 288120 cub.cm

Explanation:
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0 206
Q:

Find the total surface area (in cm2) of a right circular cone of diameter 28 cm and slant height 12 cm.

 

A) 1714 B) 1161
C) 1144 D) 1477
 
Answer & Explanation Answer: C) 1144

Explanation:
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1 209
Q:

If the edge of a cube is increased by 4 cm, the volume will increase by 988 . Then the original length of each edge of the cube is

 

A) 7 cm B) 6 cm
C) 9 cm D) 8 cm
 
Answer & Explanation Answer: A) 7 cm

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1 327
Q:

Find the height of a cuboid whose volume is 330 cm2and base area is 15cm2 .

 

A) 21 cm B) 24 cm
C) 22 cm D) 19 cm
 
Answer & Explanation Answer: C) 22 cm

Explanation:
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0 905