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XSEED Summative Assessment – Test 2

© XSEED Education Science | Grade 8 1

8

Science, Test 2



NAME: _____________________________________ GRADE: ________ SECTION: ________

PART I – Short Answer Questions 30 Marks

1. Look at the picture and fill in the blanks.

A. and are called greenhouse gases

because they the heat reflected from the Earth’s surface.

B. When the amount of greenhouse gases in the atmosphere , the

greenhouse effect . This in turn causes an increase in the Earth’s

. This is known as global warming.

C. Burning of fossil fuels in and is the main

source of increased greenhouse gases in the atmosphere.

4



2. Look at the diagram and answer the questions.

A. Why did the balloons develop the same charge?

B. If the rubbed balloons are brought close to each other, will they repel or attract? Give 1 reason for your answer.

3



3. Look at the picture and answer the questions.

A. Write any 2 features of a lightning conductor.

1.

2.

B. How does a lightning conductor protect the building from lightning?

3



4. Look at the pictures and answer the questions.

Model 1 Model 2

A. Thomson’s model of an atom is known as the plum pudding model. Rutherford’s model of an atom is compared to the solar system. Which model given above represents:

a. Thomson’s model?

b. Rutherford’s model?

B. Write 2 differences between the two models of an atom.

Thomson’s model Rutherford’s model

1.

1.

2.

2.

5



5. Read the experiments done using an electroscope and complete the table.

Draw the position of the metal leaves in the electroscope in each experiment.

Give 1 reason for the change in position of the metal leaves.

A. Neutral electroscope is touched with a negatively charged ruler.

B. Negatively charged electroscope is touched with our finger.

4



6. Read the newspaper report and answer the questions.

Golapur, 23 August 2014: An earthquake

with a magnitude of 7.2 on the Richter

scale occurred in and around Golapur

village yesterday at around 4 PM. Almost

all the houses in this small village have

been damaged. So far 12 people have

died, and about 110 people have been

injured.

A. Was the earthquake in Golapur mild or severe? Give a reason for your answer.

B. Write 2 things that the people of Golapur could have done to stay safe during the earthquake.

1.

2.

4



7. Look at the diagram showing the effect of heat on a liquid and answer the questions.

A. Fill in the table.

Property How does the property

change on heating? (increases/decreases)

Write 1 reason how does the property change on heating? (increases/

decreases) for the change in property.

Movement of particles

Volume of the liquid

B. Write 1 example from daily life where the change in volume of a liquid on heating is useful to us.

4



8. Look at the diagrams showing properties of cathode rays and fill in the table.

Experiment Which property of

cathode rays is proved by this experiment?

A.

B.

C.

3



PART II – Long Answer Questions 30 Marks

9. Read the text and fill in the table.

Pollutants in water

1 source of the pollutant 1 effect of this pollutant

A. Chemicals

B. Oil

C. Nutrients

D. Sewage

6

Any change in the properties of water that has an unhealthy effect on different living forms is called water pollution. Water is polluted by pollutants from different sources such as industries, agriculture and homes. This harms the environment and makes the water unfit for use.



10. Read the experiment and answer the questions.

A. In which metal can will the water be hotter? Give a reason for your answer.

B. How can the results of this experiment help you to choose the colour of clothes to wear in summer? Explain.

C. If in the above experiment, metal can 2 is replaced with a white-coloured plastic can, in which can will the water be hotter? Give a reason for your answer.

7

Two metal cans, one painted black on the outside and the other white, were filled with equal amounts of water. A thermometer was put into each of them and the set-up was kept out in bright sunshine for 2 hours.



D. How does heat transfer take place in the given situations?

a. From sun to the metal can:

b. From heated metal can to water:

11. Read the text and answer the questions.

A. Look at the picture and explain how each given part helps the arm to move.

Movement in the human arm

a. Joint

b. Muscle

10

Vertebrates are organisms that have a backbone. Humans, birds, reptiles and fish are some examples of vertebrates. Vertebrates move with the help of their bones and muscles.



c. Tendons

d. Cartilage

B. Look at the pictures showing how different animals move and complete the table.

Bird

Snake

Fish

Animal pairs 1 way their movement

is different 1 way their movement

is the same

Bird and fish

Snake and fish

C. Write 1 way in which the following body features of birds help them move.

a. Streamlined body shape

b. Hollow bones



12. Look at the picture and answer the questions.

Electroplating of an Iron Key with Copper

A. Give 1 reason why the copper rod is called the anode.

B. Give 1 reason why the iron key is called the cathode.

C. Explain the process of electroplating an iron key with copper.

D. Write 2 uses of electroplating in everyday life.

1.

2.

END OF QUESTIONS IN TEST PAPER

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Score Report

Name: ________________________________________________________________________

Roll No.: _______________ Grade: _______________ Section: _______________

To be filled in by the teacher:

SECTION QUESTION NUMBER/TOPIC MARKS TOTAL MARKS

Part I

Short Answer

Questions

1. Greenhouse Effect 4

2. Electrostatic Charges 3

3. Lightning Conductor 3

4. Atomic Models 5

5. Electroscope 4

6. Earthquakes 4

7. Effect of Heat on Liquids 4

8. Cathode Rays 3

PART I SUBTOTAL 30

Part II

Long Answer

Questions

9. Water Pollution 6

10. Heat Absorption 7

11. Movement in Humans and Animals 10

12. Electroplating 7

PART II SUBTOTAL 30

TOTAL MARKS 60

science, test 2 - ti schooltischool.org/xseed2017/22december2017/std_viii_sci_qp.pdf ·...

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