Group D

Welcome to your Group D

1. If E and F are the midpoints of equal sides AB and AC of a triangle ABC. Then: 
2. ABC is an isosceles triangle in which altitudes BE and CF are drawn to equal sides AC and AB respectively. Then: 
3. If ABC and DBC are two isosceles triangles on the same base BC. Then: 
4.

If ABC is an equilateral triangle, then each angle equals to:

5.

If AD is an altitude of an isosceles triangle ABC in which AB = AC. Then:

6.

In a right triangle, the longest side is: 

7.

 In triangle ABC, if AB=BC and B = 70, A will be: 

8.

The shadow of a tower is equal to its height at 10-45 a.m. The sun’s altitude is 

9.

When the length of shadow of a vertical pole is equal to √3 times of its height, the angle of elevation of the Sun’s altitude is 

10.

The angle of elevation of top of a tower from a point on the ground, which is 30 m away from the foot of the tower is 30°. The length of the tower is 

11.

 The angle of elevation of the top of a 15m high tower at a point 15m away from the base of the tower is __ . 

12.

The ratio of the height of a tower and the length of its shadow on the ground is √3 : 1. What is the angle of elevation of the sun?  

13.

If a tower 30 m high, casts a shadow 10√3 m long on the ground, then what is the angle of elevation of the sun? 

14.

If two towers of height h1 and h2 subtends angles of 60° and 30° respectively at the mid points of line joining their feet, find h1 : h2 

15.

At some time of the day the length of the shadow of a tower is equal to its height. Find the sun’s altitude at that time. 

16.

For two triangles, if two angles and the included side of one triangle are equal to two angles and the included side of another triangle. Then the concurrency rule is:

17.

 A triangle in which two sides are equal is called: 

18.

The angles opposite to equal sides of a triangle are: 

19.

In two triangles DEF and PQR, if DE = QR, EF = PR and FD = PQ, then 

20.

In ∆ABC, BC = AB and B = 80°. Then A is equal to: 

21.

Two sides of a triangle are of length 5 cm and 1.5 cm. The length of the third side of the triangle cannot be: 

22.

In ∆PQR, if R > Q, then 

23.

 D is a point on the side BC of a ΔABC such that AD bisects BAC. Then 

24.

It is given that Δ ABC  Δ FDE and AB = 5 cm, B = 40° and A = 80°. Then which of the following is true? 

25.

All the medians of a triangle are equal in case of a: 

26.

In the given figure, PS is the median then QPS? 

27.

In triangle PQR if Q = 90°, then: 

28.

In the given figure, if the exterior angle is 135o then P is: 

29.

 If in ΔPQR, PQ = PR then: 

30.

 In a triangle ABC, B = 35° and C = 60°, then 

31.

In triangles ABC and PQR, AB = AC, C = P and B = Q. The two triangles are: 

32.

 In triangles ABC and DEF, AB = FD and A = D. The two triangles will be congruent by SAS axiom if: 

33.

A plane is observed to be approaching the airport. It is at a distance of 12 km from the point of observation and makes an angle of elevation of 60°. The height above the ground of the plane is 

34.

The value of cos 0°. cos 1°. cos 2°. cos 3°… cos 89° cos 90° is 

35.

 If x tan 45° sin 30° = cos 30° tan 30°, then x is equal to 

36. If an incident ray passes through the focus, the reflected ray will
37. Magnifying power of a concave lens is
38. The least distance of distinct vision for a nor¬mal eye is
39. The defect of vision in which a person cannot see the distant objects clearly but can see nearby objects clearly is called
40. Electric potential is a:
41. The best material to make permanent magnets is
42. The magnetic field is the strongest at
43. Solar energy can be directly converted to elec-trical energy by which of the following de-vices?
44. Which of the following is the ultimate source of energy?
45. Which of the following gases is the main con-stituent of natural gas?
46. Oxidation is a process which involves
47. Which one of the following salts does not con-tain water of crystallisation?
48. The most abundant metal in the earth’s crust is
49. C3H8 belongs to the homologous series of
50. Newlands relation is called

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