This document contains a science lesson with questions and answers about fibers, materials, and properties of objects. It asks students to classify fibers as natural or synthetic, identify processes involved with making fabrics from fibers, and understand what materials common objects are made of. For example, it states that natural fibers include wool, cotton, jute and silk while synthetic fibers are nylon and polyester. It also asks students to identify which materials objects like paper and wood are made of and whether they float on water or oil.

1. SCIENCE
LESSON 3

2. Q.1. Classify the following
fibres as natural or synthetic:
nylon, wool, cotton, silk,
polyester, jute.
Ans. Natural fibres: wool,
cotton, jute, silk.
Synthetic fibres: nylon,
polyester.

3. Q.2. State whether the following statements are ‘true’ or false’:
(a) Yam is made from fibres.
(b) Spinning is a process of making fibres.
(c) Jute is the outer covering of coconut.
(d) The process of removing seeds from cotton is called ginning.
(d) Weaving of yam makes a piece of fabric.
(e) Silk fibre is obtained from the stem of a plant.
(g) Polyester is a natural fibre.
Ans.
(a) True
(b) False
(c) False
(d) True
(e) True
(f) False
(g) False

4. Q.3. Fill in the blanks:
(a) Plant fibres are obtained from____________
and___________ .
(b) Animal fibres are___________ and___________ .
Ans.
(a) cotton plants, jute plants
(b) wool, silk
Q. 4. From which part of the plant cotton and jute are
obtained?
Ans.
(i) Cotton – Cotton bolls (from the surface of cotton seeds) (fruit)
(ii) Jute – Stem
Q.5. Name two items that are made from coconut fibre.
Ans.
(i) Ropes
(ii) Mats

5. Q.6. Explain the process of making
yam from fibre.
Ans. Yarns are made up of thin
strands called fibres. The process of
making yam from fibres is called
spinning. In this process, a mass of
cotton wool are drawn out and
twisted. This brings the fibres
together to form yarn.

6. SCIENCE
LESSON 4

7. Q. 1. Name five objects which can be made from
wood.
Ans.
(i) Table
(ii) Chair
(iii) Doors
(iv) Boat
(v) Bed
Q.2. Select those objects from the following
which shine:
Glass bowl, plastic toy, steel spoon, cotton shirt
Ans. Glass bowl and steel spoon are shining
objects.

8. Q.3. Match the objects given below with the materials from
which they could be made. Remember, an object could be
made from more than one material and a given material could
be used for making many objects.

9. Q. 4. State whether the statements given below are ‘true’ or ‘false’.
(i) Stone is transparent, while glass is opaque.
(ii) A notebook has lustre while eraser does not
(iii) Chalk dissolves in water.
(iv) A piece of wood floats on water.
(v) Sugar does not dissolve in water.
(vi) Oil mixes with water.
(vii) Sand settles down in water.
(viii) Vinegar dissolves in water.
Ans.
(i) False
(ii) False
(iii) False
(iv) True
(v) False
(vi) False
(vii) True
(viii) True

10. Q. 5. Given below are the names of some objects
and materials:
Water, basket ball, orange, sugar, globe, apple and
earthen pitcher Group them as:
(a) Round shaped and other shapes
(b) Eatables and non-eatables
Ans.
(a) (i) Round shaped: Basket ball, apple, orange,
globe, earthen pitcher.
(ii) Other shapes: Water, sugar.
(b) (i) Eatables: Water, orange, sugar and apple.
(ii) Non-eatables: Basket ball, globe and earthen
pitcher.

11. Q. 6. List all the items known to you that
float on water. Check and see if they will
float on an oil or kerosene.
Ans. (A) List of some items that float on
water:
1.Paper
2.Wood
3.Thin plastic sheets
4.Wax
5.Ice
6.Thermocol

12. (B) List of items that float on an oil:
1.Paper
2.Plastic sheet
3.Wax
4.Thermocol
5.Wood
(C) List of items that float on kerosene:
1.Paper
2.Thermocol
3.Thin plastic sheet

13. Q. 7. Find the odd one out from the
following:
(a) Chair, Bed, Table, Baby, Cupboard
(b) Rose, Jasmine, Boat, Marigold, Lotus
(c) Aluminium, Iron, Copper, Silver, Sand
(d) Sugar, Salt, Sand, Copper sulphate
Ans.
(a) Baby (all others are non-living)
(b) Boat (all others are flowers)
(c) Sand (all others are metals)
(d) Sand (all others are soluble in water)