Home
Class 11
MATHS
A man standing on a level plane observes...

A man standing on a level plane observes the anlge of elevation of top of pole to be '`alpha`'. He walks a distance equal to double the height of pole towards it and finds that the elevation in `2 alpha " then " alpha` =

A

`pi/12`

B

`pi/4`

C

`pi/6`

D

`pi/3`

Text Solution

Verified by Experts

The correct Answer is:
A
Promotional Banner

Topper's Solved these Questions

  • HEIGHTS AND DISTANCES

    AAKASH SERIES|Exercise LECTURE SHEET Exercise-I (Straight Objective Type Questions)|27 Videos

  • HEIGHTS AND DISTANCES

    AAKASH SERIES|Exercise PRACTICE SHEET Exercise-I (Level-I) (Straight Objective Type Questions)|39 Videos

  • HEIGHTS AND DISTANCES

    AAKASH SERIES|Exercise LECTURE SHEET (EXERCISE - II ) (LEVEL- I (MAIN) SINGLE ANSWER TYPE QUESTIONS)|20 Videos

  • FUNCTIONS

    AAKASH SERIES|Exercise PRACTICE EXERCISE|50 Videos

  • HYPERBOLIC FUNCTIONS

    AAKASH SERIES|Exercise PRACTICE SHEET EXERCISE-II (STRAIGHT OBJECTIVE TYPE QUESTIONS)|18 Videos

Similar Questions

Explore conceptually related problems

The angle of elevation of the top of a tower from a point situated at a distance of 100 m from the base of tower is 30 degrees. find the height of the tower is

From a point on the level ground, the angle of elevation of the top of a pole is 30^@ . On moving 20 metres nearer, the angle of elevation is 45^@ . Then the height of the pole, in metres , is

A man is walking towards a vertical pillar in a straight path, at a uniform speed. At a cetrain point A on the path, he observves that the angle of elevation of the top of the pillar is 30^(@) . After walking for 10 minutes from A in the same direction, at a point B, he observes that the angle of elevation of the top of the pillar is 60^(@) . Then the time taken (in minutes ) by him, from B to reach the pillar, is

From a point on the level ground , the angel of elevation of the top of a pole is 30^(@) . On moving 20 meters nearer, the angle of elevation is 45^(@) . Then the height of the pole, in meters, is

A tower makes an angle of elevation equal to the angle of depression from the top of a cliff 25m height. Find the heigh of the tower.

Let 10 vertical poles standing at equal distances on a straight line, substend the same angle of elevation alpha at a point O on this line and all the poles are on the same side of O. If the height of the longest pole is 'h' and the distance of he foot of the smallest pole from O is 'a', then the distance between two consecutive poles is

A man observes top of a tower at an angle of elevation of 30^@ . When he walked 40 m towards the tower, the angle of elevation is changed to 60^@ Find the height of the tower and distance from the first observation point to the tower.

A sperical balloon of radius r subtends an angle alpha at the eye of an observer, while the angle of elevation of its centre is beta . The height of the centre of the ballon is

AAKASH SERIES-HEIGHTS AND DISTANCES-PRACTICE SHEET (EXERCISE HEIGHTS AND DISTANCES) (LEVEL- I (MAIN) SINGLE ANSWER TYPE QUESTIONS)
  1. A man standing on a level plane observes the anlge of elevation of top...

    Text Solution

    |

  2. AB is vertical pole with B at ground level and A at the top. A man fi...

    Text Solution

    |

  3. From a point on the level ground , the angel of elevation of the top ...

    Text Solution

    |

  4. The angle of elevation of an object from a point P on the level ground...

    Text Solution

    |

  5. The angles of elevation of a tower from two points which are at distan...

    Text Solution

    |

  6. At a certain point the angle of elevation of a tower is found to be co...

    Text Solution

    |

  7. The angle of elevation of the top of a tower standing on a harzontal p...

    Text Solution

    |

  8. A person stading on the bank of a river observerves that the angle of ...

    Text Solution

    |

  9. From the top of a hill h metre high, the angles of depressions of the ...

    Text Solution

    |

  10. A chimney leans towards north. At equal distance due north and south o...

    Text Solution

    |

  11. A tower subtends angles alpha,2 alpha, 3 alpha respectively at points ...

    Text Solution

    |

  12. A vertical tower stands on a declivity which is inclinde at 15^(@) to ...

    Text Solution

    |

  13. In a prison wall there is a window of 1 metre height, 14 metres from t...

    Text Solution

    |

  14. A flag-staff stands on a tower which is on level ground. The total hei...

    Text Solution

    |

  15. A tower stands at the top a hill whose height is three times the heigh...

    Text Solution

    |

  16. A vertical pole more than 100 ft high consists of two portions the low...

    Text Solution

    |

  17. A straight pole A subtends a right angle at a point B of another pole ...

    Text Solution

    |

  18. A tower, of x metres high, has a flagstaff at its top. The tower and t...

    Text Solution

    |

  19. From the top of a chiff 30 metres high, the angle of elevation of the ...

    Text Solution

    |

  20. From a point E on the horizontal due to east of a tree, the top of the...

    Text Solution

    |