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CBSE Questions for Class 10 Maths Some Applications Of Trigonometry Quiz 11 - MCQExams.com

The angle of elevation of the top of a tower from a point A on the ground is 30. On moving a distance of 20 meters towards the foot of the tower to a point B, the angle of elevation increases to 60. The height of the tower is:
  • 3m
  • 53m
  • 103m
  • 203m
Two poles of equal heights are standing opposite each other on either side of the road which is 80 m wide. From the points between them on the road, the  elevation of the top of the poles are 60 and 30 respectively. Find the height of the poles.
  • 103 m
  • 203 m
  • 20 m
  • 153 m
A ladder rests against a wall at an angle α to the horizontal. Its foot is pulled away from the wall through a distance a slides a distance b down the wall making an angle β with the horizontal. Choose the correct option-
  • a=btan(α+β2)
  • b=atanα+β2
  • a=bsinα+β2
  • b=asinα+β2
The angle of elevation of jet fighter from A point on the ground is 600. After a fight of 15 seconds angle of elevation changes to 300. If the jet is flying at a speed of 720 km/hr. Find the constant height at which jet is flying. (Take 3=1.732).
  • 2.598km
  • 2.598m
  • 280m
  • 2.97m
The height of the tower is 50 m  when angle of elevation changes from 450 to 300, the shadow of tower becomes x meters more, find the value of x.
  • 50
  • 5030
  • 50( 13)
  • 25
The shadow of a vertical tower on a level ground increases by 10 when the altitude of the sun changes from 450 to 300. Find the height of the tower, correct to two decimal places.
  • 14 m
  • 13.69
  • 3.69 m
  • 14.69 m
An aeroplane is moving one kilometer high from West to East horizontally. From a point on the ground the angle of elevation of the aeroplane is 60o, and after 10 seconds, the angle of elevation of the aeroplane is observed as 30o, then the speed of the aeroplane in km/hour is.
  • 1203
  • 2403
  • 120
  • 240
From the top of a cliff 25 m height, the angle of the elevation of the the top of tower is found to be equal to the angle of depresion of the foot of the tower. The height of the tower is
  • 25m
  • 50 m
  • 252m
  • 252m
The lower window of a house is at 2 m above the ground and its upper window is 4 m vertically above the lower window. At certain instant the angle of elevation of balloon from these windows are observed to be 600 and 300 respectively. Then the height of the balloon above ground is
  • 12 m 
  • 14 m
  • 8 m
  • 16 m
From the top of a building 15\text{ m}  high the angle of elevation of the top a tower is found to be 30^\circ. From the bottom of the same building, the angle of elevation of the tower id found to be 60^\circ. Find the height of the tower and the distance between the tower and the building.
  • h= 22.5\text{ m} , D=38.97\text{ m}
  • h=22.5\text{ m}, D=12.97\text{ m}
  • h= 38.97\text{ m}, D=22.5\text{ m}
  • h=12.97\text{ m}, D= 22.5\text{ m}
The angle of elevation of the top of a tower at any point on the ground is \dfrac{\pi}{6} and after moving 20 meters towards the tower it becomes {\pi}{3}.The height of the tower is equal to :
  • 10 meters
  • {10}{\sqrt3} meters
  • \dfrac{10}{\sqrt3} meters
  • 5\sqrt3 meters
The angle of elevation of the top of a tower from a point 20m away from its base is {60^ \circ }. The height of the tower is-
  • 2\sqrt{3}\,m
  • -20\sqrt{3}\,m
  • \sqrt{3}\,m
  • 20\sqrt{3}\,m
If the angles of elevation of the top of a tower from the top and foot of a pole height 10mt are 30^{o} and 60^{o} then the height of the tower is
  • 12\ mt
  • 15\ mt
  • 20\ mt
  • 36\ mt
The shadow of the tower standing on a level ground is found to be 60 meters longer when the suns altitude is 30^{o} than when it is 45^{o}. The height of the tower is
  • 60m
  • 30m
  • 60\sqrt{3}m
  • 20(\sqrt{3}+1)m
A vertical to stands on a horizontal plane and is surmounted by a vertical flag staff of height 6 meters. At point on the plane angle of elevation of the bottom and the top of the flag staff are respectively { 30 }^{ \circ  }and60^{ \circ  }. Find the height of tower.
  • 5 m
  • 3m
  • 10 m
  • 7.5 m
The angle of elevation of the sun, when the length of the shadow of a tree is \sqrt{3} times the height of the tree, is
  • {30}^{\circ}
  • {45}^{\circ}
  • {60}^{\circ}
  • {90}^{\circ}
The length of the shadow of a tower standing on level plane is found to be 2x metres longer when the sun's altitude is 30 than when it was 45.
 then height of tower   x ( \sqrt { 3 } + 2 ) .  that is true /false 
  • True
  • False
From the bottom of  a pole of height h the angle of elevation the top of a tower is \alpha and the pole subtends an angle \beta and top of the tower. The height of the tower is:
  • \dfrac{h\tan(\alpha-\beta)}{\tan(\alpha-\beta)-\tan\alpha}
  • \dfrac{h\cot(\alpha-\beta)}{\cot(\alpha-\beta)-\cot\alpha}
  • \dfrac{\cot(\alpha-\beta)}{\cot(\alpha-\beta)-\cot\alpha}
  • None\ of\ these

 A person , standing on the bank of a river observer that the angle subtended by tree on the opposite bank is, when he retreats 40 meters from the bank, he finds the angle to be . the height of the tree and the breadth of the river are :

  • 10\sqrt 3 \,\,meters\,,\,10\,meters
  • 20\sqrt 3 \,\,meters\,,\,10\,meters
  • \,20\sqrt 3 \,\,meters\,,\,20\,\,meters
  • none of these
From a point at a height of 27 metres above a lake, the angle of elevation of the top of a tree on opposite side is 30^{o} and the angle of depression of the image is 45^{o}. The height of the tree from water level is (in metres)
  • 10(2+\sqrt{3})
  • 10(2-\sqrt{3})
  • 27(2-\sqrt{3})
  • 27(2+\sqrt{3})
A fire at a building is reported by a telephone of two fire stations {F_1}\,\& \,{F_2} which are 10km apart from each on a straight road. {F_1}\,\& \,{F_2} observe that the fire is at an angle of {60^0}\,\& \,{45^0} to the road. which station should send its team & how much it have to travel.
  • {F_1},7.32m
  • {F_1},17.32m
  • {F_2},7.32m
  • {F_2},17.32m
A bird is sitting on the top of a tree, which is 80\,m high. The angle of the elevation of the bird , from a point on the ground is 45^\circ . The bird flies away from the  point  of observation horizontally and remains at a constant height. After 2  seconds, the angle of elevation of the bird from the point of observation becomes 30^\circ . Find the speed of the bird.
  • 45(\sqrt3 -1)
  • 40(\sqrt4 -1)
  • 40(\sqrt3 -1)
  • 30(\sqrt3 -1)
If the angles of the elevation of a tower from two points distant a and b\ (a > b) from its foot and in the same straight line from it are 30^0 and 60^0, then the height of the tower is 
  • \sqrt{a+b}
  • \sqrt{ab}
  • \sqrt{a-b}
  • \sqrt{\dfrac{a}{b}}
P and Q are two points observed from the top of a building 10\sqrt{3}\ \text{ m} high if the angles of depression of the points are complementary and PQ=20\ \text{m}, then the distance of P from the building is : (P being the farther point) 
  • 30\ \text{m}
  • 75\ \text{m}
  • 45\ \text{m}
  • 40\ \text{m}
The length of a string between a kite and a point on the ground is 50 m. The string makes an angle of 60^{\circ} with the level ground. If there is no slack in the string, the height of the kite is : 
  • 50\sqrt{3} m
  • 25\sqrt{3} m
  • 25 m
  • \dfrac {25}{\sqrt{3}} m
A straight tree breaks due to storm and the broken part bends so that the top of the tree touches the ground making an angle of 30^{\circ} with the ground. The distance from the foot of the tree to the point where the top touches the ground is 10 \text{ m}. The height of the tree is 
  • 10(\sqrt{3}+1)\text{ m}
  • 10\sqrt{3}\text{ m}
  • 10(\sqrt{3}-1)\text{ m}
  • \dfrac{10}{\sqrt{3}}\text{ m}
 A man observes that when he moves up a distance c metres on  a slope, the angle of depression of a point on the horizontal plane from the base of the slope is {30}^{o} and when he moves up further a distance c metres, the angle of depression of that point is {45}^{o}. The angle of inclination of the slope with the horizontal is
  • {60}^{o}
  • {45}^{o}
  • {75}^{o}
  • {30}^{o}
From the top of a pillar of height 20\ m, the angles of elevation and depression of the top and bottom of another pillar are 30^0 and 45^0 respectively. The height of the second pillar (in meters) is: 
  • \dfrac{20(\sqrt{3}+1)}{\sqrt{3}}
  • 10
  • 10\sqrt{3}
  • \dfrac{10}{\sqrt{3}}(\sqrt{3}+1)
The length of a shadow of a vertical tower is \dfrac{1}{\sqrt{3}} times its height. The angle of elevation of the sun is:
  • 30^{o}
  • 45^{o}
  • 60^{o}
  • 90^{o}
A straight tree breaks due to storm and the broken part bends so that the top of tree touches the ground making an angle of {30}^{o} with the ground. The distance from the foot of the tree to the point where the top touches the ground is 10 meters. The height of the tree is :
  • 10\left( \sqrt { 3 } +1 \right) m
  • 10\sqrt { 3 } m
  • 10\left( \sqrt { 3 } -1 \right) m
  • \dfrac { 10 }{ \sqrt { 3 } } m
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