A solid cylinder, made of iron is melted and recasted into solid cones of same radius of cross-section and height. Then the number of cones obtained is :

1. 2

2. 6

3. 3

4. 4

If a matrix A is of order 3 × 2 and matrix B is of order 2 × 3, then the order of matrix AB is :

1. 3 × 2

2. 3 × 3

3. 2 × 3

4. 2 × 2

Line segment AB joining the points A = (0, -10) and B = (20, 5) is divided internally into five equal parts by points P, Q, R and S. The co-ordinates of points Q are :

1. (8, -4)

2. (4, -8)

3. (-8, -4)

4. (-4, -8)