46
Q:

The dimensions of an open box are 50 cm, 40 cm and 23 cm. Its thickness is 2 cm. If 1 cubic cm of metal used in the box weighs 0.5 gms, find the weight of the box.

A) 8.04kg B) 8.14kg
C) 8.24kg D) 9.04kg

Answer:   A) 8.04kg



Explanation:

Volume of the metal used in the box = External Volume - Internal Volume 

                                                    = [(50 x 40 x 23) - (44 x 34 x 20)] cu.cm  

                                                    = 16080 cu.cm 

 

Weight of the metal =[(16080 x 0.5)/1000] kg = 8.04 kg.

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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0 139
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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4 880
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 1388
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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0 822
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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0 209
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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1 210
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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1 332
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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0 909