NOTES / SOLVED EXERCISES GENERAL SCIENCE 4 (IV) PTB LHR (2014-15)

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NOTES / SOLVED EXERCISES GENERAL SCIENCE 4 (IV) PTB LHR (2014-15)

 

No. & Chapters’ & Names Page
1.  UNDERSTANDING OURSELVES

2.  CHARACTERISTICS & NEEDS OF LIVING THINGS 

3.  FOOD & HEALTH

4.  LIVING THINGS & THEIR ENVIRONMENT

5.  MATTER & ITS STATES

6.  HEAT & ITS MEASUREMENT

7.  FORCE  & MACHINES

8.  INTRODUCTION TO SOUND

9.  INVESTIGATING ELECTRICITY & MAGNETISM

10.      MOVEMENT OF THE EARTH

1-18

 

19-33

34-47

48-56

57-75

76-86

87-100

101-112

113-129

 

 

 

 

 

 

 

 

 

Ch:1 UNDERSTANDING OURSELVES  P:1-18

EXERCISE

1.1- COMPLETE THE FOLLOWING SENTENCES.

(i) Heart lies in the centre of the—————————–

(ii) The first set of teeth that are replaced by permanent teeth is called —————

(iii) We must brush our teeth————– day.

(iv) We normally breathe about———————-times per minute.

(v) Muscles are attached to———————-

(vi) Dengue fever is caused by a —————

(vii) Dengue fever is spread by —————-

Answers: (i-)chest cavity(ii-)milk teeth(iii-)twice(iv-)15(v-)bounes(vi-)virus(vii-)aedes mosquito

 

1.2- EACH STATEMENT IS FOLLOWED BY FOUR OPTIONS. ENCIRCLE THE CORRECT ANSWER.

(i) The sticky material deposited on the tree h is called

(a) saliva (b) pulp (c) plaque   (d) acid

(ii) Which of the following is NOT the function of the muscles?

(a) protect organs a (b) pump blood

(c) help in movement (d) help in breathing;

(iii) i Which one of the following organs help  digestion of food?

(a) bones (b) stomach (c) lungs  (d) skin

(iv) Which one of the following is the function of the brain?

(a) memory (b) digestion (c) breathing (d) vision

(v) Which one of the following organs helps us to get in oxygen and remove carbon dioxide

(a) brain (b) lungs (c) stomach (d) skin

(vi) The dengue virus is spread by

(a)air (b)flies (c)Aedes mosquito (d)shaking hands

Answers: (i-c)(ii-a)(iii-b)(iv-a)(v-b)(vi-c)

1.3 – WRITE SHORT ANSWERS.

(i) What are milk teeth?

 

(ii) Why joints are necessary in our body?

 

(iii) How blood reaches other parts of our body?

 

(iv) What will you immediately do if you have an accidental burn or a cut?

 

(v) Why one should avoid excessive use of spicy food?

 

(vi) How dengue fever spreads?

 

(vii) State important preventive measures from dengue fever.

 

(viii) Explain the importance of clean environment for our health

 

1.4- Write down functions of skin.

1.5 – What are the functions of stomach?

1.6 – Write down functions of skeleton.

1.7 – What is tooth decay?

1.8- How will you care for your skin?

Ch:2 CHARACTERISTICS & NEEDS OF LIVING THINGS  P:19-33

EXERCISE

2.1 COMPLETE THE FOLLOWING SENTENCES.

(i) Living things include human beings, animals,—————-  and microorganisms.

(ii) Plants use carbon dioxide and ———- to make food.

(iii) Production of young ones is called————–

(iv) A caterpillar changes to a ——————

(v) We inherit characters from our ———-.

Answers: (i-plants)(ii-water)(iii-reproduction)(iv-pupa)(v-parents)

 

2.2 EACH STATEMENT IS FOLLOWED BY FOUR OPTIONS. ENCIRCLE THE CORRECT ANSWER.

(i) Which of the following gases is used by plants to prepare food?

(a) oxygen (b) nitrogen (c) hydrogen (d) carbon dioxide

(ii) A chair is made of wood which comes from a tree. The chair is

(a) living (b) non-living (c) was living but-now nonliving (d) none of these

(iii) Reproduction means

(a) increases in size of the body (b) to produce young ones (c) prepare food (d) move from one place to another

(iv)  Which of the following materials are combined by the plants to prepare food?

(a) carbon dioxide and oxygen (b) carbon dioxide and hydrogen (c) carbon dioxide and water (d) oxygen and water

(v)  Which one of the following does not need food?

(a) a boy (b) an animal (c) a stone (d) a plant

Answers: (i-d)(ii-c)(iii-b)(iv-c)(v-c)

2.3 WRITE SHORT ANSWERS.

(i) List the physical characteristics of living things.

(ii) Why living things need food?

(iii) What is growth?

 

2.4 Draw a simple diagram to show life cycle of a butterfly.

2.5 Write a short note on the life cycle of a bee.

2.6 Compare the life cycles of any two animals.

2.7 Describe different stages in the life cycle of a plant.

 

Ch: 3  FOOD & HEALTH  P:34-47

EXERCISE

 

3.1 COMPLETE THE FOLLOWING SENTENCES.

(i) Proteins are essential for—————– and repair of the body

(ii) Glucose is a ——————.

(iii)  Body needs vitamins in—————– quantities.

(iv) Table salt is a —————–

Answers: (i-growth)(ii-carbohydrates)(iii-small quantities)(iv-minerals)

 

3.2. FOUR CHOICES HAVE BEEN PROVIDED FOR EACH STATEMENT. ENCIRCLE THE CORRECT ANSWER.

(i) Which of the following foods is a source of starch?

(a) meat (b) eggs  (c) cooking oil (d) bread A

(ii) Which of the following foods is NOT a good source of proteins?

(a) meat (b) potatoes (c) eggs (d) fish

(iii) Butter is a

(a) carbohydrate (b) fat (C) protein (d) mineral

(iv) The richest source of energy are

(a) fats  (b) proteins (c) carbohydrates (d) vitamins

Answers: (i-d)(ii-b)(iii-b)(iv-c)

3.3. Write a short note on balanced diet.

3.4. What is food pyramid?

3.5. Write an essay on vitamins and their importance.

Ch: 4 LIVING THINGS & THEIR ENVIRONMENT  P:48-56

EXERCISE

4.1 COMPLETE THE FOLLOWING SENTENCES.

(i) Every thing around us is part of our —————–.

(ii) A bear can feed on a fish as well as on an apple. By feeding habit it is a——— .

(iii) A food chain shows the process of———————

(iv) Plants prepare food and are called ——————.

(v) Pond is an example of ———————-environment.

Answers: (i-environment)(ii-omniver)(iii-eating)(iv-producer)(v-water)

 

4.2 EACH QUESTION IS FOLLOWED BY FOUR OPTIONS. ENCIRCLE THE CORRECT

 

(i) A desert is an example of————–

(a) land environment (b) water environment (c) air environment  (d) none of these

(ii) An animal that eats other animals is called—————–

(a) herbivore (b) carnivore (c) omnivore (d) decompose

(iii) Which of the following animals is an example of decomposers?

(a) a plant (b) an animal (c) bacteria (d) human beings

(iv) Plants are green and prepare food. They are called—————

(a) consumers (b) decomposers (c) producers (d) omnivore

(v) Clouds are a part of ————-

(a) land environment  (b) air environment  (c) water environment (d) all of the above

Answers: (i-a)(ii-b)(iii-c)(iv-a)(v-b)

4.3 Explain that animals and plants are adapted to the environment.

4.4 Draw a simple food chain starting with grass in the lawn of your school.

Ch: 5 MATTER & ITS STATES  P:57-75

EXERCISE

 

5.1 FOUR CHOICES HAVE BEEN PROVIDED FOR EACH STATEMENT. ENCIRCLE THE CORRECT ANSWER.

(i) What is true about the solid state of matter?

(a) No fixed shape (b) No fixed volume (c) Fixed shape and fixed volume (d) Fixed shape but no fixed volume.

(ii) The process in which a gas turns into a liquid:

(a) Freezing (b) Condensation (c) Melting (d) Boiling

(iii) Which mixture can be separated by filtration?

(a) Mixture of table salt and water (b) Mixture of baking soda and water (c) Mixture of sand and water (d) Mixture of sugar and water

(iv) Indicate in which season the amount of water vapours in air increases?

(a) During very hot summer (b) During rainy season  (c) During winter (d) During spring

(v) Which form of matter can be poured from one container to another?

(a) Solid (b) Liquid (c) Gas (d) all forms

(vi) Which process is used to separate water after boiling rice in the kitchen?

(a) Filtration (b) Condensation (c) Decantation (d) Freezing

(vii) When a candle burns, solid wax changes into liquid form. What name you will give to this change?

(a) Melting (b) Freezing (c)  Boiling (d) Condensing

(viii) Name the process which involves mixing?

(a) Formation of dew in the morning (b) Converting water into steam (c) Making ice (d) Preparing soda water

(ix)Which of the following is not a mixture?

(a) Air (by) River water  (c) Milk (d) Sugar

Answers: (i-c)(ii-b)(iii-c)(iv-a)(v-b)(vi-a)(vii-a) (viii-d)(ix-c )

5 2. FILL THE COLUMN KEEPING IN VIEW THE STATE OF MATTER.

 

  SHAPE VOLUME
SOLID Fix Fix
LIQUID Not fix Fix
GAS Not fix Not fix

Answers: (i-)(ii-)(iii-)

 

5.3  Add the following things one by one in water and stir. Record your observations.

Butter, Wax, Glucose, Chalk powder, Baking powder

5.4 Kitchen is a place where you see many things belonging to all the three states of matter. Prepare the list of six solids, four liquids and three gases which are usually present in the kitchen.

5.5 Prepare a list of solid things present in your classroom.

5.6 What will happen when a liquid is either cooled or heated:

5.7 Name a drink which can be prepared by mixing a solid a liquid and a gas?

5.8 What will happen when sunflower oil-is mixed with water?

5.9 How solid liquid and gaseous states of matter are identified?

5.10 Suppose you are passing along the canal and you are thirsty as well, What will you do before drinking water of that canal?

5.11 Match the statements on the left with the statements on the right.

   
     i.        Boiling water

ii.        Heating a solid

iii.        Condensation of water vapours

iv.        Cooling water

a.   Forms clouds

b.   Forms Steam

c.   Forms ice

d.   Forms liquid

Answers: (i-b)(ii-d)(iii-a)(iv-c)

Ch: 6 HEAT & ITS MEASUREMENT P:76-86

EXERCISE

6.1. EACH STATEMENT IS FOLLOWED BY TOUR OPTIONS. ENCIRCLE THE CORRECT ANSWER.

(i) Heat always flows

(a) from one body to another at the same temperature

(b) from lower temperature towards higher temperature

(c) from higher temperature towards lower temperature (d) none of these

(ii) The bulb of a thermometer is filled with (a) water (b) oil (c) alcohol (d) gas

(iii) On the centigrade scale, the interval between two fixed temperatures is divided into

(a) 80 divisions (b) 100 divisions (c)180 divisions (d) 212divisions

(iv) The range of a clinical thermometer is

(a) from 35°C to 42°C (b) from 0°C to 37°C  (c) from 0°C to 100°C V (d) from 32°C to 212°C .

(v) 1. C rise in temperature is

(a) smaller than 1. F rise in temperature (b) greater than 1°F rise in temperature (c)r equal to 1°F rise in temperature (d) none of these

(vi) The temperature of boiling water in Fahrenheit scale is

(a) 32 degree (b) 37 degree (c) 100 degree (d) 212 degree

(vii) The temperature of melting ice in Centigrade scale is

(a) 0 degree (b) 32 degree (c) 100 degree (d) 212 degree

Answers: (i-c)(ii-c)(iii-b)(iv-a)(v-b)(vi-d)(vii-a)

6.2 MATCH COLUMN A TO B.

A B
(i) as Thermometer

(ii) Celsius scale W

(iii) Heat

(iv) Boiling point of water

(v) Fahrenheit scale

     i.        100 equal division

ii.        Energy

iii.        180 equal divisions

iv.        Temperature

v.        100 °C

vi.        9s.6 °F

Answers: (i-iv)(ii-i)(iii-ii)(iv-v)(v-vi)

6.3 What is Temperature? Explain.

6.4 Describe an activity to show that heat flows from a body higher temperature to a body of lower temperature.

6.5 What is a thermometer? Describe two scales of a thermometer.

6.6 Why is there a constriction just above the bulb in a clinical thermometer?

6.7 What safety measures should be observed while using a thermometer?

 

Ch: 7 FORCE & MACHINES P:87-100

EXERCISE

7.1. COMPLETE THE FOLLOWING SENTENCES.

(i) Position of an object can be changed by …… .,…or pulling it

(ii) Greater is the force the ………….. .. is the distance covered by the object.

(iii) Speed is obtained by dividing the distance by the …………… ..taken

(iv) A machine is a …………….. .. that makes work easier.

Answers: (i-pusing)(ii-larger)(iii-time)(iv-device)

7.2. MATCH COLUMN A TO B.

A B
(i) Machine

(ii) Speed

(iii) Force

(iv) heavy object

(i) Push and pull

(ii) Greater force

(iii) Work easily

(iv) Distance and time

Answers: (i-iii)(ii-iv)(iii-i)(iv-ii)

 

7.3 SELECT THE CORRECT ANSWER FROM THE FOLLOWING.

(i) Greater force is required to stop a moving

(a) bicycle (b) motorcycle (c) car (d) bus

(ii) To change the shape of a body, it needs

(a) time (b) force (c) speed  (d) distance

(iii) Speed is obtained by

(a) dividing the distance by time taken  (b) dividing the time taken by the distance covered (c) multiplying the distance by the time taken (d) adding the distance into time

(iv) IO lift heavy objects, we use a

(a) wheel barrow  (b) pulley (c) hammer (d) scissors.

Answers: (i-d)(ii-b)(iii-b)(iv-b)

 

7.4. How can you prove that position of an object can be changed by pushing or pulling it?

7.5. Describe an activity to show that motion of an object can be changed by applying force on it.

7.6. What is speed? How can it be determined?

7.7. Define a simple machine. Give three common examples of simple machines.

7.8. Explain how force can change the shape of an object.

 

Ch: 8 INTRODUCTION TO SOUND  P:101-112

EXERCISE

 

8.1 COMPLETE THE FOLLOWING SENTENCES.

(i) Sound is produced by ————objects.

(ii) The loudness of the sound is called its————————- .

(iii) Sounds which produce————————– effect are called noise.

(iv) Musical sounds—————————– us

Answers: (i-vibrating)(ii-intensity)(iii-unpleasant )(iv-please)

 

8.2 ENCIRCLE THE CORRECT ANSWER IN THE FOLLOWING.

(i) Sound cannot pass through

(a) water (b) air (c) vacuum (d)solid

(ii) Noise is produced by

(a) chirping of a bird (b) sound of loud speaker (c) sound of a flute (d) rustling of leaves

(iii) The explosions occurring in the Sun cannot be heard on the Earth because

(a) the Sun is at a very large distance from the Earth (b) there is cold air high in the sky (c) there is hot air high in the sky (d) there is vacuum between the Earth and the Sun

(iv) Which sound is the loudest?

(a) human voice (b) horn of a car (c) whistle of a train (d) chirping of a bird

(v) Noise can cause

(a) malaria (b) high blood pressure (c) cough (d) flu

Ans: (i- c)(ii- b)(iii-d )(iv-c )(v-b )

 

8.3 Give some examples of pleasant and unpleasant sounds.

8.4 How sound in produced?

8.5 What do you understand by intensity of sound?

8.6 Explain with the help of an activity that sound cannot pass  through vacuum.

8.7 Describe the effects of noise on human health.

8.8 What is noise pollution? How noise pollution can be reduced?

 

Ch:9 INVESTIGATING ELECTRICITY & MAGNETISM   P:113-128

EXERCISE

 

9.1 . SELECT CORRECT ANSWER FROM THE FOLLOWING.

(i) To open or close a circuit we use a

(a) bulb (b) switch (c) bar magnet (d) piece of wood

(ii) Current can easily pass through

(a) piece of rubber (b) wooden strip (c) copper wire (d) plastic comb

(iii) A magnet can attract objects made of

(a) iron (b) copper (c) aluminium (d) plastic

(iv) The ends of a bar magnet are called its

(a) heads (b) terminals (c) poles (d) sides

(v) An iron rod can be magnetized by

(a) sliding with ha magnet (b) heating it (c) striking it (d) placing it in the north-south direction

Answers: (i-b)(ii-c)(iii-a)(iv-c)(v-a)

 

9.2. COMPLETE THE FOLLOWING SENTENCES.

(i) Current can pass through—————————–

(ii) On turning the switch off, the circuit become————————– or open.

(iii) Magnets can be made artificially by ———————————- iron.

(iv) A freely suspended magnet always points in the —————– direction

(v) A magnet can be demagnetized by ——————— or striking.

Answers: (i-iron)(ii-incomplete)(iii-sliding)(iv-north south)(v-heating)

 

9.3 What is a simple circuit?

9.4. What is a switch used for?

9.5. Describe two properties of a magnet.

9.6. How a magnet can be demagnetized?

9.7. How the magnets are to be stored?

9.8. A, B and C are three similar bars. One is a magnet, another iron bar and the third a copper bar. How would you identify which one is which?

9.9. Can you make a magnet with only one pole? Explain.

 

Ch:10 MOVEMENT OF THE EARTH   P:129-138

EXERCISE

 

10.1 COMPLETE THE FOLLOWING SENTENCES.

(i) Our Earth is——————- in shape.

(ii) On 22nd  December, the day is the——————— in northern part.

(iii) On 21st  June, the day is the—————————– in northern part.

(iv) The Earth revolves around the Sun in——————————- path.

Answers: (i-spherical)(ii-coldest and shortest)(iii-hottest and longest)(iv-orbital )

 

10.2 SELECT THE CORRECT ANSWER FROM THE FOLLOWING.

(i) Day and night appears due to .

(a) spherical shape of the Earth (b) orbital motion of the Earth(c) spin of the Earth (d) tilt of axis

(ii) The season is moderate in -the northern part of the Earth on

(a) June 21 (b) September 23 (c) December 22 (d) December 25

(iii) The shape of Earth is ———————

(a) spherical (b) flat (c) circular (d) cubical

(iv) The seasons are caused by

  1. a) the spin of the Earth (b) the orbital motion of the Earth (c) the orbital motion and tilt of its axis (d) the spin of the Earth and tilt of its axis

(v) The time period of a planet depends upon

(a) its shape (b) its spin (c) its distance from the Sun 1 (d) none of these

ANS(i-c)(ii-b)(iii-a)(iv-b)(v-c)

10.3 What is the shape of our Earth?

10.4 How long does the Earth take to complete one rotation about it axis?

10.5 How long does the Earth take to go once around the Sun?

10.6 How do days and nights appear?

10.7 What are two reasons due to which the seasons are changed on the Earth?

10.8 Give one proof to show that the Earth is round and not flat.

10.9 What do you understand by the spin motion of an object?

10.10 What is meant by an orbit?

10.11 How will the seasons and appearance of day and night be affected if the Earth stops its orbital motion around the Sun?

———————————THE END————————————–

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