The ratio in which the line joining (4, -3, 2) and (6, -5, -1) is divided by YZ-plane is _______.

1

(a)

2 : 3

(b)

2 : -3

(c)

-2 : 3

(d)

none of these

The ratio in which the line joining the points (a, b, c) and (-4, 3, -6) is divided by XY-plane is ______.

1

(a)

c : 6

(b)

6 : c

(c)

2 : 4

(d)

b : 3

The points (3, 3, 3), (0, 6, 3), (1, 7, 7) and (4, 4, 7) are vertices of ______.

1

(a)

a rectangle

(b)

a square

(c)

a parallelogram

(d)

a rhombus

If (3, 4, -1) and (-1, 2, 3) be the endpoints of a diameter of a sphere. Then radius of sphere is equal to ______.

1

(a)

2

(b)

4

(c)

5

(d)

6

In the three dimensional space the equation x² - 7x + 12 = 0 represents ______.

1

(a)

pair of straight lines

(b)

curves

(c)

planes

(d)

none of these