CBSE Class 10 Mathematics VBQs Applications Of Trigonometry

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VBQ for Class 10 Mathematics Chapter 9 Some Applications of Trigonometry

Class 10 Mathematics students should refer to the following value based questions with answers for Chapter 9 Some Applications of Trigonometry in Class 10. These VBQ questions with answers for Class 10 Mathematics will come in exams and help you to score good marks

Chapter 9 Some Applications of Trigonometry VBQ Questions Class 10 Mathematics with Answers

Case Study Based Questions

I. Application of Trigonometry—Height of Tree/Tower: Mr. Suresh is an electrician. He receives a call regarding a fault on a pole from three different colonies A, B and C. He reaches one-by-one to each colony to repair that fault. He needs to reach a point 1.3 m below the top of each pole to undertake the repair work. Observe the following diagrams.

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Refer to Diagram A

Question. What should be the length of ladder DQ that enable him to reach the required position if the height of the pole is 4 m?
(a) (5√3/7)m
(b) (9√3/5)m
(c) (7√2/5)m
(d) (4√3/5)m
Answer : B

Question. What is the distance of the point where the ladder is placed on the ground if the height of pole is 4 m?
(a) 2.5 m
(b) 3.8 m
(c) 1.56 m
(d) 5.3 m
Answer : C

Refer to Diagram B

Question. Given that the length of ladder is 4 2 m . What is height of pole?
(a) 4(1/2)m
(b) 4√5 m
(c) 5√5 m
(d) 5√3 m
Answer : D

Question. The distance of the point where the ladder lies on the ground is
(a) 3√5 m
(b) 4√2 m
(c) 4 m
(d) 4√7 m
Answer : C

Refer to Diagram C

Question. The angle of elevation of reaching point of ladder at pole, i.e., H, if the height of the pole is 8.3 m and the distance GF is 73 m, is
(a) 30°
(b) 60°
(c) 45°
(d) None of these.
Answer : A
 

II. A group of students of class X visited India Gate on an educational trip. The teacher and students had interest in history as well. The teacher narrated that India Gate, official name Delhi Memorial, originally called All-India War Memorial, monumental sandstone arch in New Delhi, dedicated to the troops of British India who died in wars fought between 1914 and 1919.The teacher also said that India Gate, which is located at the eastern end of the Rajpath (formerly called the Kingsway), is about 138 feet (42 metres) in height.

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Question. What is the angle of elevation if they are standing at a distance of 42 m away from the monument?
(a) 30°
(b) 45°
(c) 60°
(d) 0°
Answer : B

Question. They want to see the tower at an angle of 60°. The distance where they should stand will be
(a) 25.24 m
(b) 20.12 m
(c) 42 m
(d) 24.25 m
Answer : D

Question. If the altitude of the Sun is at 60°, then the height of the vertical tower that will cast a shadow of length 20 m is
(a) 20√3 m
(b) (20/√3)m
(c) (15/√3)m
(d) 15√3 m
Answer : A

Question. The ratio of the length of a rod and its shadow is 1:1 . The angle of elevation of the Sun is
(a) 30°
(b) 45°
(c) 60°
(d) 90°
Answer : B

Question. The angle formed by the line of sight with the horizontal when the object viewed is below the horizontal level is
(a) corresponding angle
(b) angle of elevation
(c) angle of depression
(d) complete angle
Answer : C
 

III. A satellite flying at a height h is watching the top of the two tallest mountains in Uttarakhand and Karnataka, they are being Nanda Devi (height 7,816 m) and Mullayanagiri (height 1,930 m). The angles of depression from the satellite, to the top of Nanda Devi and Mullayanagiri are 30° and 60° respectively. If the distance between the peaks of two mountains is 1937 km, and the satellite is vertically above the mid-point of the distance between the two mountains.

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Question. The distance of the satellite from the top of Nanda Devi is
(a) 1118.29 km
(b) 577.52 km
(c) 1937 km
(d) 1025.36 km
Answer : A

Question. The distance of the satellite from the top of Mullayanagiri is
(a) 1139.4 km
(b) 577.52 km
(c) 1937 km
(d) 1025.36 km
Answer : C

Question. The distance of the satellite from the ground is
(a) 1139.4 km
(b) 566.96 km
(c) 1937 km
(d) 1025.36 km
Answer : B

Question. What is the angle of elevation if a man is standing at a distance of 7816 m away from Nanda Devi?
(a) 30°
(b) 45°
(c) 60°
(d) 0°
Answer : B

Question. If a mile stone very far away from, makes 45° to the top of Mullayangiri mountain. So, find the distance of this mile stone from the mountain.
(a) 1118.327 km
(b) 566.976 km
(c) 1937 km
(d) 1025.36 km
Answer : C
 

 
Question 1. A tree breaks due to storm and the broken part bends so that the top of the tree touches the ground making an angle 30° with it. The distance between the foot of the tree to the point where the top touches the ground is 8 m. The teacher asked the students to find the height of the tree. All the students failed but Neeraj took initiative and calculated it correctly using trigonometry. What height Neeraj calculated? What quality of Neeraj is depicted here?
Answer : 8 3 m, Leadership Logical, Reasoning
 
Question 2. A person, standing on the bank of a river, observes that the angle subtended by a tree on the opposite bank is 60°. When he retreates 20 m from the bank, he finds the angle to be 30°. Find the height of the tree and the breadth of the
river? What skill is used by the person.
Answer : 10 3 m, 10 m, Logical
 
Question 3. Anand is watching a circus artist climbing a 20 m long rope which is tightly stretched and tied from the top of a vertical pole to the ground. Find the height of the pole if the angle made by the rope with the ground level is 30°. What value is experienced by Anand?
Answer : 10 m, 30 y, Fun, Entertainment
 
Question 4. A pilot is flying an areoplane at an altitude of 1800 m observes that two ships are sailing towards it in the opposite directions. The angles of depressions of the ships as observed from the aeroplane are 60° & 30° respectively. Find the distance between the two ships? What value of the pilot is shown?
Answer : 2400 3 m, Reasoning, Logical
 
Question 5. The angle of elevation of a bird observed by a hunter who is 12 m above a lake is 30° and the angle of depression of bird's reflection in the lake is 60°. Find the distance between the bird and the hunter. What value is used by the hunter if he want to hit the bird?
Answer : 24 m, Accuracy, Concentration, Confidence, Focus, Anticipation, Reasoning.
Chapter 03 Pair of Linear Equations in Two Variables
CBSE Class 10 Mathematics Pair of Linear Equations in Two Variables VBQs
Chapter 13 Surface Areas and Volumes
CBSE Class 10 Mathematics Surface Areas And Volume VBQs

VBQs for Chapter 9 Some Applications of Trigonometry Class 10 Mathematics

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