**GSEB Solutions for Class 6 Science and Technology – Measurement ****(English Medium)**

GSEB SolutionsMathsScience

**Exercise 55: **

**Solution 1:**

The cloth-merchant uses a metre rod to measure clothes.

**Solution 1(a):**

1 centimetre is equal to 10 millimetres.

**Solution 2:**

The master tailor uses a cloth tape or a metre rod to measure clothes.

**Solution 3:**

We will use a ruler from our geometric box to measure the length of a line segment or the length of a pencil.

**Exercise 56: **

**Solution 1(a):**

**Exercise 58: **

**Solution 1(a):**

If one end of the scale is broken at zero (0) mark then keep the pencil parallel to the scale touching it such that one of it ends coincides with the marking (1) on the scale. Note the number of the scale which coincides with the other end of the pencil. Now, subtract 1 from this number to get the length of the object.

**Exercise 59: **

**Solution 1(a):**

The total number of squares occupied by a card piece is nothing but the area of the card piece in square centimetres. This is found using the formula: Area = Length × Breadth

The area of the first card piece= 3 × 5 = 15 cm^{ 2
}The area of the first card piece= 8 × 5 = 40 cm^{ 2
}The area of the first card piece= 3× 3 = 9 cm^{ 2}

**Solution 1(b):**

Measurement of area is used while planning the construction and size of a house. It is also calculated to find out the number of tiles and the cost to be given to the labour for fitting tiles in a room.

**Exercise 60: **

**Solution 1(a):**

60 seconds are equal to 1 minute.

**Exercise 61: **

**Solution 1(a):**

In the early days man estimated time with the help of natural phenomena such as the sunrise, sunset, flowering of trees and plants, full Moon day, breeding cycles and migration of animals and birds.

**Exercise 63: **

**Solution 1.1:
**The following things should be kept in mind while measuring the length of any object:

- The object to be measured should be kept properly on the scale such that one of its end coincides with the zero (0) mark on the scale.
- The object to be measured should be kept parallel to the scale and touching it.
- While taking the reading, the end of the object, the mark of the scale and your eyes should all be in a straight line perpendicular to the scale.

**Solution 1.2:
**The approximate time to estimate the completion of one year can be found by the time taken by some trees for flowering and bearing fruits.

For example, a mango tree starts bearing mangoes and after definite time interval it will again bear mangoes. This time interval is of approximately a year. The gulmohar tree blossoms. The flowers then shed off and after a definite interval of time it starts flowering again. This period between consecutive flowerings is about one year.

**Solution 1.3:
**The circumference of the trunk of a tree can be measured by using the measuring tape used by a tailor. We follow the following method:

**Method:**

- Place the zero mark of the measure tape anywhere on the trunk of the tree and press it.
- Circle the tree trunk with the tape so that it meets the zero mark.
- Note the reading where the zero mark coincides with the mark on the tape.
- The reading noted is the circumference of the trunk.

**Solution 1.4:
**To find the area covered by your seat first measure the length and breadth of the square or rectangle around your seat using a ruler. The area of the rectangle can be calculated by the product of the length and breadth measured.

Suppose the length and breadth of the rectangle measured is 40 cm and 35 cm respectively.

Area of the rectangle = Length × Breadth

= 40 × 35

= 1400 cm

^{2}

**Solution 2:**

Yes, we can make a water-clock using plastic bottle and I.V. set.

**Method:**

- Take a plastic bottle and fill it completely with water. Fit an air tight cork to the bottle.
- Pass the front pointed end of the I.V set through the cork.
- Invert the bottle and hang it to a stand.
- Keep the other end of the I.V set into a bucket as shown in the figure.
- Slightly open the clip of the I.V set such that the water drips at a moderate rate into the bucket.
- After every 5 minutes mark the water level on the bottle.
- Note the time taken to empty the entire water in the bottle.
- Fill the bottle again and let the water drip at the same rate. Note whether it takes the same time to empty the bottle. The water clock is now ready for use.