Bridge course 8th science

 Test number 2

Q1) write the answer of the following questions

1) observe the given picture carefully. How would  you avoid this ?

Answer:  picture shows leather shoes get affected by fungi due to moisture. we would avoid this by applying polish or oil on the leather shoes.

2) What type of change is the change of season from  summer to rain to winter?

Answer  :The type of change is the change of season from summer to rain to winter is the periodic changes

3) complete the following chart

Cell 🠊 tissue 🠊 organ 🠊 organ system 🠊 body

Q2) Write the answer to the following question.

1) Distinguish Between -  conduction and convection

 Conduction

 Transfer of heat from the hot part of an object to  the
cold  part is called conduction of heat.
 Medium is required for conduction of heat.
 In  conduction particles of material hot move only

transfer of heat from one particle to the next particle

take place

Convection

 Heat is  transferred  by means of  currents called

convection current. This process is called

convection of heat.
Convection needs a medium.

In convection molecules of material absorb

heat and move to another place.

2)  A force of 800N applied to stop a car that was moving with a constant velocity the car stopped after moving 12 m  how much work is the work done ?

 answer:  F= 800 n, S=Displacement, - 12 m

12 is negative because after applying break  car was opposite to  force

 W= f* s

    =  800 N *(-12) m

   = - 9600 Newton metre

   

 work unit is Joule = - 9600 J

3)Why does this happen?- there is a cracking sound protected while warning a sweater

 answer: sweater is made up of wool, due to  friction electric charge develops on Wool.

  while warning a sweater by friction static electric charge was developed on Wool. due to opposite charge attraction  minute spark from which cows crack soun

Q3) Write the answer of the following questions

1)Identify the  parts shows in the figure and write their function

Answer : A- liver

Main function storage by glucose

store biel Digestive juices

            It help to digest fats 

 B- stomach

 stomach secrete gastric juices

 churning of food takes places

 mainly protein are are digested in stomach

C- small intestine

 most of digestion and Absorption of food take place in small intestine

 digestive juices Mix in small intestine

 absorption of nutrients takes place in small intestine 

2)What precaution will you take during thunderstorms?

 Answer:

•  Do not stand near the electric pole.

•  do not stand on open ground

•  do not stand on below  A tree 

•  do not stand near On A Tower

•  do not use the guest in electric  appliances

•  do not use mobile or phone

•  stand on dry wool, plastic sheet, Sack or jute cloth

• Stand on dry leaves

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