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- Question
The height and the total surface area of a right circular cylinder are 4 cm and 8? sq.cm. respectively. The radius of the base of cylinder is
Options- A. (2?2 - 2) cm
- B. (2 - ?2) cm
- C. 2 cm
- D. ?2 cm
- Correct Answer
- (2?2 - 2) cm
- 1. The radius of a wire is decreased to one-third. If volume remains the same, length will increase by
Options- A. 1.5 times
- B. 3 times
- C. 6 times
- D. 9 times Discuss
- 2. Three cubes of iron whose edges are 6cm, 8cm and 10cm respectively are melted and formed into a single cube. The edge of the new cube formed is
Options- A. 12 cm
- B. 14 cm
- C. 16 cm
- D. 18 cm Discuss
- 3. The radii of two cylinders are in the ratio 2:3 and their heights are in the ratio 5:3. The ratio of their volumes is
Options- A. 27:20
- B. 20:27
- C. 4:9
- D. 9:4 Discuss
- 4. Two chords AB and CD of a circle with centre O intersect at P. If ?APC = 40°. Then the value of ?AOC + ?BOD is
Options- A. 50°
- B. 60°
- C. 80°
- D. 120° Discuss
- 5. The whole surface area of a pyramid whose base is a regular polygon is 340 cm2 and area of its base is 100 cm2 . Area of each lateral face is 30 cm2. Then the number of lateral faces is
Options- A. 8
- B. 9
- C. 7
- D. 10 Discuss
- 6. The radius of a cylindrical milk container is half its height and surface area of the inner part is 616 sq.cm. The amount of milk that the container can hold, approximately, is [ Use : ?5 = 2.23 and ? = 22/7 ]
Options- A. 1.42 litres
- B. 1.53 litres
- C. 1.71 litres
- D. 1.82 litres Discuss
- 7. A solid brass sphere of radius 2.1 dm is converted into a right circular cylindrical rod of length 7cm. The ratio of total surface areas of the rod to the sphere is
Options- A. 3:1
- B. 1:3
- C. 7:3
- D. 3:7 Discuss
- 8. ABCD is a cyclic quadrilateral of which AB is the diameter. Diagonals AC and BD intersect at E. If ?DBC = 35°, Then ?AED measures
Options- A. 35°
- B. 45°
- C. 55°
- D. 90° Discuss
- 9. In a triangle ABC, ?A = 70°, ?B = 80° and D is the incentre of ?ABC. ?ACB = 2x° and ?BDC = y°. The values of x and y, respectively are
Options- A. 15, 130
- B. 15, 125
- C. 35, 40
- D. 30, 150 Discuss
- 10. In a right angled triangle ?DEF, if the length of the hypotenuse EF is 12 cm, then the length of the median DX is
Options- A. 3 cm
- B. 4 cm
- C. 6 cm
- D. 12 cm Discuss
Volume and Surface Area problems
Search Results
Correct Answer: 9 times
Correct Answer: 12 cm
Correct Answer: 20:27
Correct Answer: 80°
Correct Answer: 8
Correct Answer: 1.53 litres
Correct Answer: 7:3
Correct Answer: 55°
Correct Answer: 15, 125
Correct Answer: 6 cm
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