In the given figure, BC = 16 cm, BD = 4 cm, then AB is equal to :

1. 5 cm

2. 8 cm

3. 6 cm

4. 4 cm

A thick card-board is cut into the shape as shown alongside. It is given a full round about its line of symmetry (shown by dotted line). The solid so formed has :

(i) one cone and one cylinder

(ii) two cones only

(iii) two cones and one cylinder

Which of the statements given above is true ?

1. only (i)

2. only (iii)

3. only (ii)

4. (ii) and (iii)

The sum of two angles of a triangle is equal to its third angle. Then the triangle is :

1. isosceles only

2. right-angled only

3. equilateral

4. isosceles right-angled

Two tangents are drawn to a circle which touch the circle at points A and B. The maximum distance between the points A and B is :

1. radius of the circle

2. diameter of the circle

3. π × radius of the circle

4. π × diameter of the circle