Discussion
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- Question
Length of the sides of a triangle are a, b, c respectively. If a2 + b2 + c2 = ab +bc + ca then the triangle is
Options- A. isosceles
- B. equilateral
- C. scalene
- D. right-angled
- Correct Answer
- equilateral
- 1. Length of the sides of a triangle are a, b, c respectively. If a2 + b2 + c2 = ab +bc + ca then the triangle is
Options- A. isosceles
- B. equilateral
- C. scalene
- D. right-angled Discuss
- 2. Two circles touch each other externally. The distance between their centres is 7 cm. If the radius of one circle is 4 cm, then the radius of the other circle will be
Options- A. 3 cm
- B. 4 cm
- C. 5.5 cm
- D. 3.5 cm Discuss
- 3. An arc of 30° in one circle is double an arc in a second circle, the radius of which is three times the radius of the first. Then the angles subtended by the arc of the second circle at its centre is
Options- A. 3°
- B. 4°
- C. 5°
- D. 6° Discuss
- 4. A solid sphere of radius 9 cm is melted to form a sphere of radius 6 cm and a right circular cylinder of same radius. The height of the cylinder so formed is
Options- A. 19 cm
- B. 21 cm
- C. 23 cm
- D. 25 cm Discuss
- 5. Which of the set of three sides can't form a triangle?
Options- A. 5 cm, 6 cm, 7 cm
- B. 5 cm, 8 cm, 15 cm
- C. 8 cm, 15 cm, 18 cm
- D. 6 cm, 7 cm, 11 cm Discuss
- 6. A right circular conical structure stands on a circular base of 21m diameter and is 14m in height. The total cost of colour washing for its curved surface at Rs. 6 per sq. m. is (Take ? = 22/7 )
Options- A. 4365
- B. 4465
- C. 3465
- D. 3365 Discuss
- 7. Points P , Q and R are on a circle such that ?PQR = 40° and ?QRP = 60° . Then the subtended angle by arc QR at the centre is
Options- A. 80°
- B. 120°
- C. 140°
- D. 160° Discuss
- 8. In an isosceles triangle ?ABC, AB = AC and ?A = 80°. The bisector of ?B and ?C meet at D. The ?BDC is equal to
Options- A. 90°
- B. 100°
- C. 130°
- D. 80° Discuss
- 9. Radius of cross section of a solid right circular cylindrical rod is 3.2 dm. The rod is melted and 44 equal solid cubes of side 8 cm are formed. The length of the rod is (Take ? = 22/7)
Options- A. 56 cm
- B. 7 cm
- C. 5.6 cm
- D. 0.7 cm Discuss
- 10. If the volumes of two right circular cones are in the ratio 1:4 and their diameters of bases in the ratio 4:5, then their heights will be in the ratio:
Options- A. 1: 5
- B. 4:25
- C. 16:25
- D. 25:64 Discuss
Volume and Surface Area problems
Search Results
Correct Answer: equilateral
Correct Answer: 3 cm
Correct Answer: 5°
Correct Answer: 19 cm
Correct Answer: 5 cm, 8 cm, 15 cm
Correct Answer: 3465
Correct Answer: 160°
Correct Answer: 130°
Correct Answer: 7 cm
Correct Answer: 25:64
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