Selina Concise Class 6 Math Chapter 21 Fundamental Concepts Exercise 21A Solution

Selina Concise Class 6 Math Chapter 21 Fundamental Concepts Exercise 21A Solution

EXERCISE 21A

(1) State, true or false, correct the statement:

(i) False; Dot has no length and width.

(ii) True

(iii) False; The line segment PQ is only written as PQ.

(iv) True

(v) False; Three points are said to be collinear, if they lie in a straight line.

(vi) True.

(2) Write how many lines can be drawn through:

(i) Infinite.

(ii) Only one.

(iii) Only one.

(iv) None.

(3) The shaded region of the given figure shows a plane:

(a) Name:

(i) A, B and C

(ii) A, D and C

(iii) AC and DC

(b) State whether true or false:

(i) True

(ii) True

(iii) False

(iv) False

(4) Correct the statement, if it is wrong:

(i) A ray can be extended infinitely on only one side of it

(ii) A ray has indefinite length

(iii) Correct

(iv) A line has no end-point

(v) Correct

(5) State true or false, if false, give the correct statement:

(i) False; a line has an infinite number of points on it

(ii) False; an infinite number of lines can pass through a given point

(iii) True

(6) State whether the following pairs of lines or rays appear to be parallel or intersecting.

(i) Intersecting

(ii) Parallel

(iii) Parallel

(iv) Intersecting

(7) Give two examples, from your surroundings, for each of the following:

(i) Tip of your pencil and tip of a nail

(ii) Lines printed on your note-book and edge of your table-top

(iii) Top of your study table a wall of your class-room

(iv) Surface of a cricket-ball and surface of your pen.

(8) Under what condition will two straight lines in the same plane have:

(9) Mark two points A and B on a page of your exercise book. Mark a third point P such that:

(10) Mark two points P and Q on a piece of paper. How many lines can you draw:

(i) Only one

(ii) Infinite

(iii) Infinite

(11) The adjoining figure shows a line AB. Draw figures to represent:

(12) The adjoining figure shows a ray AB. Draw figures to show:

(13) The adjoining figure shows a line segment AB. Draw figures to represent:

(14) Use a ruler and find whether following points are collinear or not:

(i) No

(ii) No

(iii) Yes

(iv) No

(15) From the adjoining figure, write:

(i) EF ∕∕ GH, EF ∕∕ IJ and GH ∕∕ IJ

(ii) AB and CD

(iii) AB and GH


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