Discussion
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- Question
? PQR is right angled at Q. If m?R = 60°, what is the length of PR (in cm), if RQ = 4?3 cm?
Options- A. 8
- B. 4
- C. 8/?3
- D. 8?3
- Correct Answer
- 8?3
- 1. The line segment AB intersects the straight line CD at B; AB will be smallest when ? ABD (in degrees) is
Options- A. 30
- B. 60
- C. 90
- D. 45 Discuss
- 2. The surface area of a sphere is 5544 cm2. Find its diameter (in cm).
Options- A. 42
- B. 21
- C. 84
- D. 63 Discuss
- 3. ? ABC is right angled at B. If m?A = 30°. What is the length (in cm) of AB, if AC = 8 cm?
Options- A. 2?3
- B. 4?3
- C. 4/?3
- D. 2/?3 Discuss
- 4. What is the reflection of the point (5 , -1) in the line y = 2?
Options- A. (5, -5)
- B. (-5, -5)
- C. (5, 5)
- D. (-5, 5) Discuss
- 5. In an isosceles triangle ABC, AB = AC, XY || BC. If ?A = 30, then ?BXY =
Options- A. 75°
- B. 30°
- C. 150°
- D. 105° Discuss
- 6. ?ABC is isosceles having AB = AC and ?A = 40°. Bisectors PO and OQ of the exterior angles ?ABD and ?ACE formed by producing BC on both sides, meet at O. Then the value of ?BOC is
Options- A. 70°
- B. 110°
- C. 80°
- D. 55° Discuss
- 7. A right triangular prism has equilateral triangle as its base. Side of the triangle is 15 cm. Height of the prism is 20?3 cm. What is the volume (in cm3) of the prism?
Options- A. 1125
- B. 6750
- C. 4500
- D. 3375 Discuss
- 8. The radius and height of a solid cylinder are increased by 2% each. What will be the approximate percentage increase in volume?
Options- A. 6.76
- B. 5.88
- C. 6.12
- D. 3.34 Discuss
- 9. A sphere of radius 21 cm is cut into 8 identical parts by 3 cuts (1 cut along each axis). What will be the total surface area (in cm2) of each part?
Options- A. 844.5
- B. 1732.5
- C. 1039.5
- D. 1115.6 Discuss
- 10. The ratio between the length and the breadth of a rectangular park is 3 : 2. If a man cycling along the boundary of the park at the speed of 12 km/hr completes one round in 8 minutes, then the area of the park (in sq. m) is:
Options- A. 15360
- B. 153600
- C. .30720
- D. 307200 Discuss
Volume and Surface Area problems
Search Results
Correct Answer: 90
Correct Answer: 42
Correct Answer: 4/?3
Correct Answer: (5, 5)
Correct Answer: 105°
Correct Answer: 70°
Correct Answer: 3375
Correct Answer: 6.12
Correct Answer: 1732.5
Correct Answer: 153600
Explanation:
Perimeter = Distance covered in 8 min. = (12000/60) * 8 = 1600m
Let length = 3x metres and breadth = 2x metres.
Then, 2(3x + 2x) = 1600 or x = 160.
Length = 480 m and Breadth = 320 m.
Area = (480 x 320) = 153600
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