Question

Answer the following
11.(a)Compare any 2 properties of rayon and acrylic.

(b)What is the disadvantage of a synthetic fibre?

(c)Give 2 examples which indicate that nylon fibres are very strong

(d)Differentiate between thermoplastics and thermosetting plastics on the basis

of effect of high temperature.

12.(a)Why is it difficult to move a box from the rest than when it is already in

motion?

(b)Give 2 examples that friction is necessary for everyday activities

(c)Write 2 examples where sliding friction is replaced by rolling friction

(d)Give reason for the following

(i)Kabaddi players rub their hands with mud beforeplaying.

(ii)It is difficult to walk on wet floor

.

13.(a)Describe a simple experiment to demonstrate that liquids exert pressure on

the walls of the container.

(b) Name the forces acting on a plastic bucket containing water held above

ground level in your hand. Explain briefly why the forces acting on the bucket

do not bring a change in its state of motion.

(c) What is the relationship between pressure, force and area?

BIOLOGY

I Choose the correct answer

1. Yeast is used in the production of

A) Sugar B) Hydrochloric acid C) alcohol D) Oxygen

Ans: -______________________________

2. The most common carrier of communicable disease is

A) Ant B)housefly C) dragonfly D) spider

Ans: -_______________________________

3.Theterm used for the process of separation of grains from chaff is

A) sieving B) threshing C) winnowing D)handpicking

Ans: -_________________________________​

Answer 1

Answer:

Bio

1 alcohol

2 housefly

3 winnowing