a) 63.5 m b) 76.9 m c) 86.7 m d) 90 m Answer: a Explanation:
View QuestionThe angle of elevation of the top of a tower from a certain point is 30°. If the observed moves 20 m towards the tower, the angle of elevation the angle of elevation of top of the tower increases by 15°. The height of the tower is
a) 17.3 m b) 21.9 m c) 27.3 m d) 30 m Answer: c Explanation: ...
View QuestionThe angle of elevation of the sun, when the length of the shadow of a tree √3 times the height of the tree, is:
The angle of elevation of the sun, when the length of the shadow of a tree √3 times ...
View QuestionTwo persons are on either sides of a tower of height 50 m. The persons observers the top of the tower at an angle of elevation of 30° and 60°. If a car crosses these two persons in 10 seconds, what is the speed of the car?
a) $$24\sqrt 3 \,{\text{km/hr}}$$ b) $$\frac{{20\sqrt 3 }}{3}\,{\text{km/hr}}$$ c) $$\frac{{24}}{{\sqrt 3 }}\,{\text{km/hr}}$$ d) None of these Answer: ...
View QuestionThe angle of elevation of the sun, when the length of the shadow of a tree is equal to the height of the tree, is:
a) 30° b) 60° c) 45° d) None of these Answer: c Explanation:
View QuestionAn aeroplane when 900 m high passes vertically above another aeroplane at an instant when their angles of elevation at same observing point are 60° and 45° respectively. Approximately, how many meters higher is the one than the other?
a) 381 m b) 169 m c) 254 m d) 211 m Answer: a Explanation: ...
View QuestionA man is watching from the top of a tower a boat speeding away from the tower. The boat makes an angle of depression of 45° with the man’s eye when at a distance of 100 metres from the tower. After 10 seconds, the angle of depression becomes 30°. What is the approximate speed of the boat, assuming that it is running in still water?
a) 26.28 km/hr b) 32.42 km/hr c) 24.22 km/hr d) 31.25 km/hr Answer: a ...
View QuestionA vertical pole fixed to the ground is divided in the ratio 1 : 9 by a mark on it with lower part shorter than the upper part. If the two parts subtend equal angles at a place on the ground, 15 m away from the base of the pole, what is the height of the pole ?
a) $$60\sqrt 5 \,{\text{m}}$$ b) $${\text{15}}\sqrt 5 \,{\text{m}}$$ c) $$15\sqrt 3 \,{\text{m}}$$ d) $${\text{60}}\sqrt 3 \,{\text{m}}$$ Answer: a ...
View QuestionThe angle of elevation of the top of a tower at a point on the ground 50 m away from the foot of the tower is 45°. Then the height of the tower (in metres) is
a) $$50\sqrt 3 $$ b) $$50$$ c) $$\frac{{50}}{{\sqrt 2 }}$$ d) $$\frac{{50}}{{\sqrt 3 }}$$ Answer: b Explanation: Let AB ...
View QuestionFrom the top of a cliff 25 m high the angle of elevation of a tower is found to be equal to the angle of depression of the foot of the tower. The height of the tower is
a) 25 m b) 50 m c) 75 m d) 100 m Answer: b Explanation: Let AB be the ...
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