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- Question
A spherical lead ball of radius 6 cm is melted and small lead balls of radius 3 mm are made. The total number of possible small lead balls is
Options- A. 4250
- B. 4000
- C. 8005
- D. 8000
- Correct Answer
- 8000
- 1. A 1.6 m tall observer is 45 meters away from a tower. The angle of elevation from his eye to the top of the tower is 30°, then the height of the tower in meters is
Options- A. 25.98
- B. 26.58
- C. 27.58
- D. 27.98 Discuss
- 2. If x=aCos?Cos?, y = aCos?Sin? and z= aSin?, then the value of x2+ y2 + z2 is
Options- A. 2a2
- B. 0
- C. 4a2
- D. a2 Discuss
- 3. The value of sec217°-1tan273°-sin17°sec73°
Options- A. 1
- B. 0
- C. -1
- D. 2 Discuss
- 4. If xa+b+1=xa-b+a-ba+b , then x is equal to
Options- A. 2a-b
- B. a+b
- C. a-b
- D. 2a+b Discuss
- 5. If a-b=1 and a3-b3 = 61 , then the value of ab will be
Options- A. -20
- B. 20
- C. 30
- D. 60 Discuss
- 6. If x2+5x+6 = 0 , then the value of 2xx2-7x+6 is
Options- A. 1/6
- B. 1/3
- C. -1/6
- D. -1/3 Discuss
- 7. If a+b=5 and ab=3, then the value of (a2+b2) is
Options- A. 17
- B. 18
- C. 19
- D. 20 Discuss
- 8. A 8 cm long perpendicular is drawn from the centre of a circle to a 12 cm long chord. The diameter of the circle is
Options- A. 10 cm
- B. 12 cm
- C. 16 cm
- D. 20 cm Discuss
- 9. If x = a + 1/a, y = a - 1/a, then the value of x4+y4-2x2y2
Options- A. 4
- B. 8
- C. 16
- D. 64 Discuss
- 10. If 2x+4-2x+2=3 , then the value of x?
Options- A. 0
- B. 2
- C. -1
- D. -2 Discuss
Simplification problems
Search Results
Correct Answer: 27.58
Correct Answer: a2
Correct Answer: 0
Correct Answer: a-b
Correct Answer: 20
Correct Answer: -1/6
Correct Answer: 17
Correct Answer: 20 cm
Correct Answer: 16
Correct Answer: -2
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