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Question No. 51
If a right circular cone of height 24 cm has a volume of 1232 cm3, then the area of its curved serface is :
A.  154 cm2  
B.  550 cm2  
C.  704 cm2  
D.  1254 cm2  

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Question No. 52
The slant height of a conical mountain is 2.5 km and the area of its base is 1.54 km2. The height of the mountain is :
A.  2.2 km  
B.  2.4 km  
C.  3 km  
D.  3.11 km  

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Question No. 53
The radius and height of a right circular cone are in the ratio 3 : 4. If its volume is 96π cm3, what is its slant height ?
A.  8 cm  
B.  9 cm  
C.  10 cm  
D.  12 cm  

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Question No. 54
If the radius of the base and the height of a right circular cone are doubled, then its volume becomes :
A.  2 times  
B.  3 times  
C.  4 times  
D.  8 times  

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Question No. 55
If both the radius and height of a right circular cone are increased by 20%, its volume will be increased by :
A.  20%  
B.  40%  
C.  60%  
D.  72.8%  

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Question No. 56
If the height of a right circular cone is increased by 200% and the radius of the base is reduced by 50%, then the volume of the cone :
A.  remains unaltered  
B.  decreases by 25%  
C.  increases by 25%  
D.  increases by 50%  

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Question No. 57
If the height of a cone be doubled and radius of base remains the same, then the ratio of the volume of the given cone to that of the second cone will be :
A.  1 : 2  
B.  2 : 1  
C.  1 : 8  
D.  8 : 1  

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Question No. 58
The radii of two cones are in the ratio 2 : 1, their volumes are equal. Find the ratio of their heights.
A.  1 : 8  
B.  1 : 4  
C.  2 : 1  
D.  4 : 1  

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Question No. 59
The volume of the largest right circular cone that can be cut out of a cube of edge 7 cm is :
A.  13.6 cm3  
B.  89.8 cm3  
C.  121 cm3  
D.  147.68 cm3  

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Question No. 60
A cylinder with base radius of 8 cm and height of 2 cm is melted to form a cone of height 6 cm. The radius of the cone will be :
A.  4 cm  
B.  5 cm  
C.  6 cm  
D.  8 cm  

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