SHAMROCK PRERNA SCHOOL

Subject- Science

Unit Test -II

M.M- 20

Name –

Q1. Classify the following fibre as natural or synthetic:-           (2)

Nylon, Wool, Cotton ,Silk ,Polyester , Jute

Q2.State whether the following statements are True or False :-          (2)

i)Yarn is made from fibre.

ii)Silk fibre is obtained from stem of a plant.

iii)Weaving of yarn makes a piece of fibre.

iv) Jute is the outer covering of coconut.

Q3. Fill in the blanks:-                    (2)

i)Plant fibres are obtained from ________  and _________.

ii)Animals fibres are __________ and ____________.

Q4.  Name the following:-   (2)

(i) 2  items that are obtained from coconut fibre .

ii) 2  main process of making yarn from fibre.

Q5.Define:-                                      (2)

i)Ginning

ii)Reversible change

iii)Spinning

iv) Irreversible change

Q6.Explain the process of making yarn from fibre .                   (2)

Q7Explain how a metal rim is fixed around the wooden wheel of a cart ?What type of change takes place during this process ?      (2)

Q8.Givetwoexamples of the following change.                              (2)

i) Reversible change

ii) Irreversible change

Q9.A bag of cement lying in an open gets wet due to rain during the night. The next day the sun shines brightly. Do you think the change which have occurred in the cement could be reversed?(2)

Q10. A thick coating of Plaster of Paris (POP) is applied over a bandage on a fractured bone to keep the fractured bone immobilised. Can the change in POP reversed ? Give reason.                            (2)