43
Q:

Three solid cubes of sides 1 cm, 6 cm and 8 cm are melted to form a new cube. Find the surface area of the cube so formed

A) 486 B) 586
C) 686 D) 786

Answer:   A) 486



Explanation:

Volume of new cube =  13+63+83cm3729cm3  

Edge of new cube = 7293 = 9cm

Surface area of the new cube = ( 6 x 9 x 9) sq.cm = 486 sq.cm

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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5 6130
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

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1 7536
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

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1 5854
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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1 740
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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2 601
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

Explanation:
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3 804
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

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2 8468
Q:

Find the volume (in cm3) of a cuboid of length, breadth and height of 7.5 cm, 5 cm and 6 cm respectively.

 

 

 

A) 195 B) 180
C) 225 D) 173
 
Answer & Explanation Answer: C) 225

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1 846