Science, Test 1 - udca.inudca.in/wp-content/uploads/2018/09/CLASS-7-SCIENCE... · Science, Test 1 . UMA DEVI CHILDRENS’S ACADEMY HALF YEARLY EXAM 2018-19 DATE : 20/09/2018 ... A

UMA DEVI CHILDRENS’S ACADEMY HALF YEARLY EXAM 2018-19

DATE : 20/09/2018 MM : 80 TIME : 3 HOURS

ALL THE BEST ALL THE BEST

© XSEED Education Science | Grade 7 1

7 Science, Test 1





NAME: ____________________________________ GRADE: _______ SECTION: _______

PART I – Short Answer Questions 40 Marks

1. Tick () ALL the options that are correct for each statement. A. The different types of wool obtained from animals are:

Angora Alpaca Acrylic

B. Artificial wool is becoming more popular than natural wool because it is:

Moth-resistant Dyed easily Quick-drying

C. In the lifecycle of a silkworm, the pupa emerges out of the cocoon as a:

Larva

Caterpillar

Moth

D. Though natural silk is a strong fibre, it can be disadvantageous because it is:

Very costly Difficult to maintain

Soft and drapes easily

2. Choose the correct option from the given pair of words and fill in the blanks. A. Water vapour tends to displace particles of air. So, air pressure in a place with 54%

humidity will be whereas the air pressure in a place with 72%

will be . (more/less)

B. A rise in temperature causes air to become less dense. So, the air pressure in a place

with 25°C will be whereas the air pressure in a place with 40°C

will be . (low/high)

C. Air is denser at sea level than at higher altitudes. Thus, a coastal region may have

air pressure while a mountain top may have

air pressure. (lower/higher)

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D. Winds are formed when air from places moves in to replace the air

in places. (cooler/warmer)

E. The air pressure of place A is 20 units and of place B is 30 units. So, wind will blow from

to . (A/B)

3. Write True or False. If false, correct and rewrite the statement.

A. A blizzard is a large snowstorm with high wind speeds and a freezing temperature of around −7 °C.

B. Cyclones are dark funnel clouds that have spiral winds blowing in an upward direction.

C. Tornadoes have very low air pressure at the centre and rapid winds blowing in a circular manner.

D. Thunderstorms are clouds that cause heavy rain, lightning and hail.

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4. Look at the pictures and fill in the table.

Weather instrument

Name of the instrument (Thermometer/Wind vane/Anemometer/

Barometer/Rain gauge)

Weather factor measured by the instrument

(Air pressure/Wind speed/Precipitation/Wind

direction/Temperature)

A.

B.

C.

D.

E.

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5. Answer the questions about nutrition in animals. A. Sequence the steps of nutrition in amoeba in the correct order by writing numbers 1–5.

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B. Look at the representative diagram of the human digestive system and fill in the blanks.

a. From the mouth the food enters the (small intestine/oesophagus) that connects the mouth with the stomach.

b. (Gall bladder/Liver) is a triangle-shaped organ located on the right side of the body that produces the bile.

c. The bag-like (stomach/liver) produces hydrochloric acid and enzymes that help in the digestion of food.

d. The finger-like projections called villi in the (small/large) intestine helps to increase the surface area of absorption.

e. The undigested food is temporarily stored in the (large intestine/ rectum) before it is passed out of the body.





6. Read the chart and complete the table.

Examples Type of change

Reversible/Irreversible Physical/Chemical

A. Breaking of a glass tumbler into pieces

B. Melting of candle into wax

C. Digestion of food in the human body

D. Baking of a cake in an oven

E. Electrolysis of water in a lab

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Types of Changes

Physical changes

Melting of ice cream is a physical change as no new substance is formed.

Physical changes like melting of ice cream can be reversed while some cannot be reversed.

Chemical changes

Cooking eggs is a chemical change because a new substance is formed.

Most of the chemical changes cannot be reversed, except a few.





7. Look at the pictures and answer the questions.

Picture Differences

A. How is heat transfer in step 1 different from that of step 3?

Thermometer 1 Thermometer 2 B. How is the use of thermometer 1 different from that of thermometer 2?

8. Answer the questions about animal adaptations. A. A polar bear lives in the Polar regions. Label any 2 features that help the polar bear

survive in its habitat.

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B. How do the features that you have marked help polar bears to survive in their habitat?

Feature How does it help?

9. Read the table about how indicators change colour with acids and bases and answer the question.

Indicator Original colour Colour in acids Colour in bases

Methyl orange Orange Red Yellow

Red cabbage juice Blue-violet Red/Pink Green/Yellow

Blue litmus Blue Red Blue

Red litmus Red Red Blue

Complete the table.

Tests Is the substance acidic/basic/neutral?

What will be the colour change of indicators in the given tests?

A. Soap solution turns red litmus paper to blue Soap solution + Methyl orange:

B. Raw mango turns methyl orange to red Raw mango + Red litmus:

C. Lemon juice turns blue litmus paper to red Lemon juice + Red cabbage juice:

D. Baking soda turns cabbage juice to green Baking soda + Blue litmus:

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Part II – Long Answer Questions 40 Marks

10. Read the experiment and answer the questions.

A. In which plastic bowl will the water be the hottest after 1 hour? Give a reason for your answer.

B. During winter we prefer wearing dark-coloured clothing. Give a reason for this, based on the experimental result.

C. If plastic bowl I is replaced in the above experiment with a metal bowl without any covering, in which bowl will the water be hottest after 1 hour? Give a reason for your answer.

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Three thick plastic bowls contain the same amount of ice water. Bowl I is covered with black paper, bowl II with white paper and bowl III with aluminum foil. A thermometer was placed in each bowl and the set-up was left out in bright sunlight for 1 hour.





D. The thermometer recorded the temperature of plastic bowl III as 101 °F.

Use the formula C (F 32)100 180

to convert the temperature to degrees Celsius.

11. Read the experiment about soil, its uses and features and answer the questions. A.

a. Which soil holds the least amount of water? Give a reason for your answer.

b. Waterlogging is a condition in which a large amount of water will accumulate near plant roots when there is over-irrigation or heavy rains. Which soil will result in most waterlogging? Give a reason for your answer.

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In an experiment, Anuj put 100 g of each type of soil – sandy, clayey, and loamy – in three separate funnels fitted with a filter paper. Then, he added 500 mL water to each funnel and allowed the water to collect in a beaker.





c. Which among the 3 soils is the best for the following crops? Give a reason for your answer.

• Rice (needs constant water, can withstand waterlogging)

• Black gram (needs sufficient water but cannot withstand waterlogging)

B. Cuscuta is a parasitic plant that obtains nutrition from other plants. a. Is soil important for parasitic plants such as cuscuta? Give a reason for your answer.

b. Give 1 more example of a plant that has similar needs as Cuscuta.

C. Some plants, such as peas have Rhizobium bacteria in their roots. a. Why do they have such bacteria?

b. How can plants like peas help to improve soil quality?





12.

A. Complete the table.

Sample Litmus red and blue Turmeric china rose Phenolphthalein

Lemon juice

Baking soda

Vinegar

Lime water

B. Describe acid rain.

13.

A. Draw the diagram of thermosflask. [3]

B. Describe the process of formation of sea breeze and land breeze. [3]

C. Convert the following. [4] i. ◦F to ◦C –

77 and 98.6 ii. ◦C to ◦F –

37 and 10

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. Types of Fibres 4

2. Air Pressure 5

3. Extreme Weather Conditions 4

4. Weather Instruments & Weather Factors 5

5. Animal Nutrition 5

6. Types of Changes 5

7. Heat — Measurement & Transfer 4

8. Adaptations in Polar Animals 4

9. Test for Acids & Bases 4

PART I SUBTOTAL 40

Part II Long Answer

Questions

10. Transfer of Heat 10

11. Types of Soil 10

12. Human Circulatory & Respiratory Systems 10

13. Neutralization Reactions 10

PART II SUBTOTAL 40

TOTAL MARKS 80

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Science, Test 1 - udca.inudca.in/wp-content/uploads/2018/09/CLASS-7-SCIENCE... · Science, Test 1 . UMA DEVI CHILDRENS’S ACADEMY HALF YEARLY EXAM 2018-19 DATE : 20/09/2018 ... A