English, asked by monikavaghela9622, 4 days ago

Do as directed.
(Conversion of tenses) 1. Rehana is singing a song. (Simple past tense) 2. Mrs. Shah sings very sweetly (Present perfect cont. Tense) 3. He runs on the road. (Simple Past tense) 4. The train is on the road. (Simple Past Tense) 6 5. Radha did not go to school. (Future Perfect) twt​

Answers

Answered by rayyanuddin027
1

Answer:

Explanation:



To make a paper scale of given least count: (a) 0.2 cm and (b) 0.5 cm



Thick ivory/drawing sheet; white paper sheet; pencil; sharpener;

eraser; metre scale (ruler); fine tipped black ink or gel pen.



Least count of a measuring instrument is the smallest measurement

that can be made accurately with the given measuring instrument.

A metre scale normally has graduations at 1 mm (or 0.1 cm) spacing,

as the smallest division on its scale. You cannot measure lengths

with this scale with accuracy better than 1mm (or 0.1 cm).

You can make paper scale of least count (a) 0.2 cm (b) 0.5 cm, by

dividing one centimetre length into smaller divisions by a simple

method, without using mm marks.



(a) Making Paper Scale of Least Count 0.2 cm

1. Fold a white paper sheet in the middle along its length.

2. Using a sharp pencil, draw a line AB, of length 30 cm in either

half of the white paper sheet [Fig. A1.1(a)].

3. Starting with the left end marked A as zero,

mark very small dots on the line AB after

every 1.0 cm and write 0,1,2 ..., 30 at

successive dots.

4. Draw thin, sharp straight lines, each 5 cm

in length, perpendicular to the line AB at

the position of each dot mark.

5. Draw 5 thin, sharp lines parallel to the line

AB at distances of 1.0 cm, 2.0 cm, 3.0

cm, 4.0 cm and 5.0 cm respectively. Let

the line at 5 cm be DC while those at 1 cm,

Fig. A1.1(a): Making a paper scale

of least count 0.2 cm

  

ACTIVITIES

20/04/2018

126

LABORATORY MANUAL

LABORATORY MANUAL

2 cm, 3 cm, and 4 cm be A1B1, A2B2, A3B3 and A4B4 respectively

[Fig A 1.1(a)].

6. Join point D with the dot at 1 cm on line AB. Intersection of this

line with lines parallel to AB at A4, A3, A2 and A1 are respectively

0.2 cm, 0.4 cm, 0.6 cm and 0.8 cm in length.

7. Use this arrangement to measure length of a pencil or a knitting

needle with least count of 0.2 cm.

(b) Making Paper Scale of Least Count 0.5 cm

1. Using a sharp pencil, draw a line AB of length 30 cm

in the other half of the white paper sheet [Fig. A1.1(b)].

2. Repeat steps 3 to 6 as in the above Activity 1.1(a), but

draw only two lines parallel to AB at distances 1.0 cm

and 2.0 cm instead of 5 cm.

3. Join diagonal 1-D by fine tipped black ink pen [Fig. A

1.1 (b)].

4. Use this scale to measure length of a pencil/knitting needle with

least count of 0.5 cm. Fractional part of length 0.5 cm is measured

on line A1B1.

(c) Measuring the Length of a Pencil Using the Paper Scales A and B

1. Place the pencil PP’ along the length of the paper scale A (least

count 0.2 cm) such that its end P is on a full mark (say 1.0 cm or

2.0 cm etc. mark). The position of the other end P′ is on diagonal

1–D. If P′ goes beyond the diagonal, place it on next upper line, in

which fraction of intersection is 0.2 cm larger, and so on. Thus, in

Fig. A 1.1 (a), length of the pencil = 3 cm + .2 × 2 cm = 3.4 cm. Take

care that you take the reading with one eye closed and the other

eye directly over the required graduation mark. The reading is

likely to be incorrect if the eye is inclined to the graduation mark.

2. Repeat preceding step 1, using the paper scale B having least

count 0.5 cm and record your observation in proper units.



Least count of the paper scale A = 0.2 cm

Least count of the paper scale B = 0.5 cm

Answered by Bookworm786
3
The ans is —

1. Rehana sung a song

2. Mrs Shah has been singing very sweetly

3. He ran on the road

4. The train was on the road

5. Radha would have not gone to school
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