LAB ACTIVITY -5

BLToPIC RELATIONS AND FUNCTIlONS

OObjective
To jdentify a relation and a function.
1. Hardboard
0 Pre-activity Knowledge 2. Battery
1.Concept of ordered pairs 3. Electric bulbs of two
different colours
2. Cartesian product of sets 4. Testing screws
3.Concept of relation andfunction Tester
UProcedure 6. Electrical wires and
switches
1. Take apiece of hardboard of convenient size and paste 7. Fevicol
a white chart paper on it. 8. Whitc chart paper
2. Drill eight holes on the left side of board in a column 9. Geonetry box
and mark them as Aj,A2, A3, A4, As. Af. A,and Ag 10. Drillmachine
as shown in the figure 5.
3. Drill seven holes on the right side of the board in a Donain
(odomain
column and mark them as T, U,V, W, X, Y andZ as
shown in the figure 5.
4. Fix bulbs of same colour in the holes Aj, A, A3, A4, A

A_, Aç, A7 and Ag.

holes T, U, V, W, A
5. Fix bulbs of the other colour in the
X, Y and Z. A

bottom of the board marked

6. Fix testing screws at the A,*
W
as I, 2, 3,., 8.
.X
such a manner that
7. Complete the electrical circuits in
A
from each column
apair of corresponding bulbs,one Af
Y
glow simultaneously.
8. These ordered pairs of bulbs will give ordered pairs, A

which will constitute arelation which in turn may/

may not be a function (see Figure 5].
Figure 5
0 Demonstration
along the left column represent domain and bulbs along the right
Ag, Ay and Ag
I. Bulbs at A,. A,,A3, A4, As, co-domain.
Column at T. U, V,... Z represent obtain different order pairs. In Fig. 5,all the
eight
screws out of given eight screws,
do Using two or more testing different ordered pairs such as (A,, T), (Az, V),(A,, U). (A4, X),
(As, U).
Screws have been used to
give
(A_, W)...etc.z
different ordered pairs one can make different sets of ordered pairs.
3. By choosing
Lab Manualin Mathematic-XI 11
 Observation
1. In figure 5, ordered pairs are
2. These ordered pairs constitute a
ne ordercd pairs (Aj, T). (A), V). (A,, U), (A, U), (A,. X) (A Y), (A, X), (Ag. )cose
which is also a-
platis..
4. The ordered pairs (A2. V), (A,, U), (A4, X), (As, W), (A,, U) constitute a
which is not a
FUKrTTN.