CBSE Class 6 Science Practice Worksheet Set A

A. Multiple choice questions.

1. Which of the following is called artificial silk

a.nylon b.rayon c.polyester d.wool

2. Bristles are tiny hairs present along the side of the body of:

a. Cockroach b. snail c. earthworm d. snake

3. How many bones are present in human skeleton

a. 200 b. 300 c. 306 d.206

4. The objects which do not emit their own light are called:

a. Luminous b. opaque c. non luminous d. all of these

5. The dark inner region of a shadow is called:

a. Penumbra b.umbra c.both a & b d. none of these

6. If a liquid conducts electricity, it is known as,

a. Cathode b. electrolyte c. conductor d.all of these

7. Which of the following is a good conductor of electricity:

a. Paper b. wood c. graphite d. plastic

8. The amount of water vapour present in the air is called:

a. Atmosphere b. smoke c.humidity d. none of these.

9. The gas which supports burning is

a. Argon b. carbondioxide c. oxygen d. nitrogen

10. Sullage is produced in

a. Crop fields b. homes c. industries d. none of these

B. Match the following:

C. Write true or false. Rewrite the false sentences.

1. Gases cannot dissolve in water.

2. A substance that allow electric current to pass through them are called insulators.

3. Reflection is sending back the light rays which fall on the surface of an object.

4. In birds the bones of the hindlimbs are modified as wings.

5. The process by which twisting of fibre is done is called spinning.

D. Define the following:
a. Bobbins:
b. Cartilage:
c. Closed circuit:
d. Atmosphere:

PHYSICS : I. FILL UPS :

1. The resistance of a wooden block is ______________ than that of a copper wire.

2. The kilowatt – hour is the unit of _______________.

3. The resultant resistance of two resistances connected in series is ___________ than the value of each of the individual resistance.

4. A voltmeter is always connected in ________ and it has a very _______ resistance.

5. An ammeter should have a very _____________ resistance.

6. The S.I. Unit of electrical energy is ____________________.

7. The resistance of metals ____________ with increase in temperatures.

8. Substances having very low electrical resistance are called ______________

9. 1 A = _________________ mA.

10. The amount of heat produced in a conductor is _________ to __________ of the current passing through the conductor.

II. PROBLEMS:

11. A current of 1.5 A flows through a wire of resistance 5 ohm. Find the amount of heat produced in 10s.

12. Two identical resistors, each of resistance 7 ohm are connected to a battery of 6V. Calculate the ratio of the power consumed by the resulting combination with minimum resistance and maximum resistance.

13. A heater draws 1000 W at 220 V. a) Find the resistance of the heater when in ON condition. Will its resistance be lesser or greater in OFF position? Give reason for your answer. B) Calculate the energy consumed in joules in a week if the heater is used 4 hrs a day.

14. In a factory, an electric bulb of 500 w is used for 2 hours and an electric motor of 373 W is used for 5Hrs daily. Calculate the cost of electricity the factory has to pay for 30 days at the rate of Rs. 3 per unit

15. A torch bulb is rate 2.5 V and 750 mA. Calculate the energy consumed by it if it is lighted for 4 hrs.

CHEMISTRY:

III. BALANCE THE FOLLOWING EQUATIONS :

1. N₂ + H₂ NH₃ 6. Na + H₂O NaOH + H_2`

2. Cl₂ + H₂ HCl 7. NaOH +H₂SO₄ Na₂SO₄ + 2H₂O

3. Al + Cl₂ AlCl₃ 8. Mg + O₂ MgO

4. Mg + N₂ Mg₃N₂ 9. Ca + H₂O CaOH + H

5. KClO3 KCl + O2 10. H + Cl HCl

IV. WRITE BALANCED CHEMICAL EQUATION:

11. Iron metal dissolves in copper sulphate solution with the formation of iron sulphate and copper.

12. Sodium metal and chlorine gas is produced when electric current is passes through molten sodium chloride.

13. Sodium metal reacts with water to produce sodium hydroxide and hydrogen gas .

14. Magnesium metal reacts with hydrochloric acid to produce magnesium chloride and hydrogen gas.

15. An aqueous solution of calcium hydroxide reacts with carbon di oxide to form white precipitate of calcium carbonate and water.

BIOLOGY: PROJECT & SEMINAR

1. Collect more information on DIGESTION PROBLEMS, CAUSES AND TREATMENT. (OR)

Collect more information on RESPIRATORY PROBLEMS, CAUSES AND TREATMENT.

Topic : Measurement and motion

Question 1: In our daily life, is it essential to measure everything accurately?
Answer : No, in our daily life it is not so important to measure everything accurately. For example, adding sugar to a tea can have slight variation, it need not be very accurate.

Question 2: When you turn a screw, it undergoes two kinds of motion at the same time. Can you identify the two kinds of motion?
Answer : When a screw is turned, first it performs rotational motion along its own axis. Secondly, while rotating it also performs translatory motion.

Question 3: What kinds of motion does an oscillating pedestal fan have?
Answer : The motion of an oscillation pedestal fan is rotational motion. Also, the fan also performs oscillatory motion.

Question 4: When you spin a top, it spins and may also move around. What kinds of motion does such a top have?
Answer : A spinning top performs a rotational motion, revolving about its own axis and at the same time if it moves around, it performs translatory motion.

Question 5: We say that a tree is stationary. But is the tree in motion with respect to some other object?
Answer : The tree fixed on earth and earth is moving. So, with respect to distant fixed stars, the tree can be considered to be in motion 

A. Choose the correct option: 1×10=10

1. For developing strong bones and teeth, which two minerals will you take more in your diet?

a. iron and sodium b. calcium and iron

c. iodine and fluorine d. calcium and phosphorus

2. Which of these is not a property of jute?

a. durability b. biodegradability c. smoothness d. strength

3. There are about 117 different types of

a. elements b. Molecules

c. mixtures c. compounds

4. A commonly used chemical for loading is

a. hydrogen b. alum

c. sulphur d. common salt

b. Give one word answer for the following questions

1. Name the process of separating cotton fibers from the seeds by combing.

2. Name the soft, inside portion of a bone where blood cells are made.

3. If a magnet is heated, it can lose its magnetism, true or false?

4. Which vitamin is easily destroyed during cooking?

SECTION-B 2×10=20

1. Name the two kinds of carbohydrates. Which of these provides us quick energy?

2. A news item: ‘silk has come under fire from animal rights activists.’ Why?

3. Metals are lustrous, but an iron rod used in construction does not shine. Explain.

4. Under which condition can handpicking are used to separate the constituents of a mixture?

Q1. Fill in the blanks

1. Animals which eat only plants are called _________

2. Food containing fats and carbohydrates are also called ____________.food.

3. Deficiency of Vitamin D in food causes ________

4. The process of making yarn from fibres is called ___________________

5. Polyester is a _____________ fibre.

Q2. State TRUE and FALSE

1. Animals which eat plants are called omnivores.

2. Snail moves with the help of muscular foot.

3. Neem is a shrub..

4. Silk fibre is obtained from root of a plant.

5. Weaving of yarn makes a piece of fibre.

Q3. Answer the following questions

1. What is the test for fats?

.2 What is spinning ?

3. How is honey produced ?

4.Define reversible change? Give examples.

5, What is transpiration?

6.What is a magnetic field ?

Write ‘True’ or ‘False’ for the following. Rewrite the correct statement.

1. A wheelbarrow is a lever of third order.

2. A crowbar helps us to move a load faster.

3. Load arm is equal to effort arm in a lever.

4. Mechanical advantage of a movable pulley is 1.

5. A wheel is a modified form of an inclined plane.

6. Lever, pulley and screw are simple machines.

7. Tongs help us to do a job which is otherwise dangerous.

8. A broom is a simple machine of third order.

Correct the following statements:-

1. The chemical substances that our body needs are called ingredients.
Answer : The chemical substances that our body needs are called Nutrients.

2. Herbivores animals have long and sharp teeth.
Answer : Carnivores are animals have long and sharp teeth.

3. Carnivores are animals eat plants.
Answer : Herbivores are animals eat plants

4. Snake has long teeth, which are used only to help in swallowing the prey as whole.
Answer : Snake has small teeth, which are used only to help in swallowing the prey as whole.

5. The first link in all food chains is herbivores.
Answer : The first link in all food chains is plants.

6. Parasites are depends on dead bodies of animals for their food.
Answer : Scavengers are depends on dead bodies of animals for their food.

7. Parasites help to keep the surroundings clean.
Answer : Scavengers help to keep the surroundings clean.

8. Humans and bears are carnivores.
Answer : Humans and bears are omnivores

9. Honey is obtained from plants.
Answer : Honey is obtained from animals.

10. Herbivores are animals that eat both plants and animals.
Answer : Omnivores are animals that eat both plants and animals.

The effort arm of a lever is 3m long, the load arm is also 3m long. What is the effort needed to raise a load of 20N? What is the mechanical advantage of this lever?

One boy of weight 40N is sitting on one side of a sea – saw at a distance of 2m from the fulcrum. Find the distance on the other side of the fulcrum where another boy should sit to balance the sea – saw?

A boy wants to use a single fixed pulley to lift a load of 200N. The Mechanical Advantage of the pulley is equal to ‘1’. Find the effort the boy needs to apply.

1. The effort arm of a lever is 6 m long and the load arm is 3 m long.

The load is 50 N. Find the effort and mechanical advantage

2. Explain the following terms

i) Effort

ii) Load

iii) Fulcrum

iv) Load Arm

v) Effort Art

vi) Mechanical Advantage

Q1. Classify the following animals as herbivore, carnivore & omnivore :- Cow, bear, Snake, Rabbit, lion, rat.

Q2. Complete the following table:-

Example                         Part of the Plant

Clove

Potato

Beetroot

Cauliflower

Q3. Write an interesting slogan to spread awareness on wastage of food should be avoided

Q1. Write any 2 food items you eat in breakfast, lunch & dinner. Name the nutrients present in them.

Q2. One day you visited your friend & found that his gums are swollen & bleeding. Which special diet

would you recommend him to recover from it & why.

Q3. Match the following:-

a. Goiter i. Starch

b. Fats ii. Iodine

c. Carbohydrate iii. Obesity

Topic : Measurement and motion

Short Question/answer-

Question 1: Why are standard units used in measurements?
Answer : Earlier, different countries had different measurements units, which caused confusion. Later, in the year 1960, the general conference of weights and measures suggested the usage of common system world over. This system is called as the systeme international d'unites (SI) system.

Question 2: What are the standard units of mass, length and time in the (a) CGS system? (b) SI system?
Answer : (a) In CGS system, the units of mass, length and time are gram, centimetre and second respectively. (b) In SI system, the units of mass, length and time are kilogram, metre and second respectively.

Question 3: To make accurate measurements there are two main requirements. What are they?
Answer : To make accurate measurements there are following two main requirements: (i) One must have an appropriate instrument. (ii) He should know how to use the instrument properly.

Question 4: When is an object said to be in motion?
Answer : An object is in motion when it changes its position with time, relative to a stationary object.

Question 5: Name the two inventions that brought about revolutions in the field of transport.
Answer : First the invention of a wheel brought a revolution in transport. The second revolution in the field of transport occurred with the invention of steam engine.

Question 6: Name the two kinds of motion that the earth has.
Answer : The first motion is rotational motion, wherein the earth rotates around its own axis. Second motion is translatory motion, where the earth moves around the sun in a circular path.

Q1.Name the Plants part from which cotton & jute is obtained.

Q2. You have to attend two weddings, one in summer & the other in winter. Which fabric clothes you would choose to wear in summer & winter wedding? Why?

Q3. Replace the underlined words with the correct words & write the sentences:

a. Cotton plant is grown in red soil.

b. Yarns are made from fabrics.

c. Polyester is a natural fibre

Q1. Fill in the blanks:-

a. Wearing of fabric is done on ___.

b. ___&____ are the items made from coconut fibre.

Q2. Rahul went to a supermarket & bought the following items: - orange , basket ball, sugar, apple globe, kite, kettle, pizza, banana, pencil. Group them as:-

a. Round shaped & other shapes

b. Eatables & non eatables.

Q3. Name any two unstitched piece of fabric.

Q4. From the following listed items, identify the knitted clothes :- Pullover, Handkerchief, Socks, School cotton shirt.

Q1.Name any 2 gases which can dissolve in water. Also , write use of each gas.

Q2. You went to the picnic near a lake with your family. Suddenly, while playing some of the things got

fallen down into the lake. Write any 2 things you observe that

1. Float or water 2. Sink in water.

Q3. Find the odd one out from the following:-

a. Aluminum , Iron, Gold, Sand

b. Table, Chair, Shoes, Cupboard

Topic : Sources of Food

Q1. Choose most appropriate answer:

1. Animals that help to keep the surroundings clean are
(a) producers b) parasites c) scavengers d) herbivores

2. The ingredients used to make food are mainly obtained from
(a) plants b) animals c) plants and animals

3. All food chains begin with
(a) plants b) animals c) plants and animals

4. Small animals that depend on other living animals for their food.
(a) ) producers b) parasites c) scavengers d) herbivores

5. Which of these animals has a long, sharp pipe instead of teeth?
a) Mosquitoes b) beers c) frog d) crow

Q2. Fill in the blanks with suitable words:

1. Food provides ________ for various activities of the body.

2. We get food mainly from _______ and ___________.

3. Green plants are known as __________.

4. Honeybees collect ________ from flowers and take it to their hive.

5. We get honey from the ___________.

Q3. Define the following terms:

1. Nutrients

2. Carnivores

3. Parasites

4. Food-chain

5. Omnivores

Q3. Write one example of food chain.

Answer the following questions:-

1. Name the sources from where we get the ingredients used in food.
Answer : Plants and animals are the sources from where we get the ingredients used in food.

2. Name three plants and their parts that we eat.
Answer : The three plants and their parts that we eat are
Stem – Potato
Root – Carrot
Seed - Wheat

3. Why does a mosquito not have teeth?
Answer : A mosquito has a long, sharp pipe instead of teeth, which is used to pierce the skin and suck the blood.

4. Do you agree that we get our food items from plants and animals?
Answer : Yes, I agree that we get our food items from plants and animals. All the food items we eat are either derived from plants ex cereals, pulses, vegetables and fruits or derived from animals ex milk, eggs and honey.

5. How is honey made?
Answer : Honeybees collect nectar from flowers and take it to their hive. There they convert it into honey and store it as food.

6. In what is a way carnivore different from a parasite?
Answer : Parasites are small animals that depend on other living animals for their food and Carnivores are animals that eat the flesh of other animals.

Q1.Complete the following table:-

Mixture Method of separation

Chalk &water

Sugar & wheat flour

Sawdust & Sand

Q2. Give an example of evaporation from daily life on large scale.

Q3. Kirti prepared a saturated solution of sugar. She wants to add more sugar to this solution. What she will do to complete this task?

Q1. You accidentally dropped your favorite toy & broke it. This is a change you did not want. Can this change be reversed?

Q2. A potter gives day the shape of pots. He bakes these pots in an oven. Can the potter get back the raw clay? Also, name the type of change.

Q3. Observe preparation of dishes at your home. Identify any two changes & classify them as reversible or irreversible.

Q1. Find a plant in your neighborhood which has a weak stem. Write its name & category.

Q2. Rita collected two plants named ‘tulsi & ‘maize’. She observed leaf venation as ‘reticulate’ on ‘tulsi’ & ‘parallel’ on ‘maize’. State what kind of roots both the plants have.

Q3. Correct the following statements & rewrite them:-

a. Stem absorbs water & minerals from the soil.

b. Leaves gives out water vapors through the process of through the process of photosynthesis.

c. Food is stored in the plant in the form of proteins.

Q-1We observe different instances of separation of materials. How will you separate the following?

a. Tea leaves from tea- Filtration

b. Butter from curd-Centrifugation

c. Cotton seed from bolls-Handpicking

d. Different fruits from basket- Handpicking

e. Sand from water-Filtration

f. Pearls of different sizes- Sieving

Q-2 Give one word answer:

a. What settles down under water from mixtures? Sedimentation

b. Liquid collected after filtration Filtrate

c. Decantation can be used to separate. Pouring out liquid without disturbing sediment

d. The process of settling down of particles of a solid in a liquid. Sedimentation

e. A Commonly used chemical for loading. Alum

f. Used to separate a mixture of two immiscible liquids. Separating funnel

Q-3 Fill in the blanks:

a. When no more solute can be dissolved in the given amount of solvent, the solution is said to be saturated.

b. Salt is obtained from seawater by the process of evaporation.

c. Filtration is helpful in separating an insoluble particle from a solution.

d. Husk from wheat flour is generally removed by winnowing.

e. Sieving is used when mixture components have different sizes.

f. The method of separating seeds of paddy from its stalk is called threshing.

g. Small pieces of stone can be removed from rice by hand-picking.

Q 1. Ram studied about the “pistil” part of flower. During an exam, he was asked to answer the parts of a pistil. What will be his answer? Also, draw the diagram of a pistil.

Q2.food is stored in different parts of a plant and one of them is roots. From the following, identify the roots which we eat:-Carrot, pumpkin, sweet potato.

Q3.Match the following:-

(i) Creeper (a) Part of a stamen

(ii) Lamina (b) Have weak Stems

(iii) Anther (c) Broad, green part of leaf

Topic : Sources of Food

Learn and write the following questions and answers-

Q1. What do you mean by herbivores?
Answer: Animals that eat only plants are known as herbivores

Q2. What do you mean by omnivores?
Answer: Animals that eat both plants and flesh of animals are known as omnivores.

Q3. What is carnivore?
Answer: Animals that eat only flesh of animals are known as carnivores.

Q4. What do you mean by autotrophs?
Answer: Organisms that make their food themselves are known as autotrophs. Plants are autotrophs because they make their food themselves.

Q5. What do you mean by heterotrophs?
Answer: Organisms that depend upon food prepared by others are called heterotrophs. Animals are heterotrophs because they eat food prepared by plants.

Q6. Name the products obtained from milk?
Answer: Cheese, butter, sweets, curd, etc.

Q7. Name five items that we get from plants?
Answer: Rice, wheat, vegetables, sugars and fruits.

Q8. What do you mean by scavengers?
Answer: Animals that clean environment by eating the flesh of dead animals are called scavengers.

Q9. Do you find that all living beings need the same kind of food?
Answer: No, all living beings do not need the same kind of food. Some animals eat plants as food, and they are called herbivores. Some animals feed on other animals, and they are called as Carnivores. Some others eat food from plant sources as well as animals, and such living beings are called omnivores.

Q10. Name any five plants and their parts that we eat.
Answer: The five plants and their parts that we eat are Brinjal- Fruit , Potato- Stem , Beetroot- Roots , Spinach- Leaves and Wheat- Seed

Q11. Why are spices used in our food?
Answer: Spices makes our food tasty.

Q12. Write the name of two plants which give us oil?
Answer: Mustard and groundnut.

Q1. You are playing football with your friends. Name any five movements of your body which you will make white playing.

Q2. Nita is doing an exercise of rotating her shoulder ten times. Name the joint which is helping her in doing the exercise.

Q3. Find the odd one out from the following:-

i. Legs, Fingers, Neck, Nose

ii. Cow, first, dog, Cat

Topic : Sources of Food

Answer the following questions:-

1. Why food is required for living organism?
Answer : Food provides energy for activity, growth and all the function of the body.

2. Why are green plants known as producers?
Answer : Green plants produce their own food.

3. Which ingredients are obtained from the earth?
Answer : Water and salt obtained from the earth.

4. All the food chains begin from green plants, why?
Answer : Green plants produce their own food.

5. Write two differences between herbivores and carnivores animals.
Answer : Herbivores are animals that eat plants. They have sharp, cutting teeth in front and flat grinding teeth at the back.
Carnivores are animals that eat the flesh of other animals. They have long sharp teeth.

6. In what way is a scavenger useful to the environment?
Answer : Scavengers mainly consume dead bodies of animals and help to keep surroundings clean.

7. Which parasites are live inside the bodies of animals?
Answer : Tapeworm, roundworm and hookworm are live inside the bodies of animals and eat the food after it has been digested by the animals.

8. What does food chain shows?
Answer : A food chains shows how each living thing gets its food in a particular environment

Q1. A patient with an injured leg visited a doctor. Name the technique doctor will use to find out the injury caused to the bones of the leg.

Q2. Explain how do muscles help in the movement of bones?

Q3. Name any two body parts where cartilage is present.

Q4. Fill in the blanks:-

a. Snail has an outer skeleton called____.

b. The body of an earthworm is made up of many ____ joined end to end.

Topic : Sources of Food

Q1. Define the following terms:-

1. Nutrients:- The chemical substances that our body needs are called nutrients.

2. Parasites:- Small animals that depend on other living animals for their food

3. Food-chain:- A food chain shows how each living things gets its food in a particular environment.

4. Scavengers :- Animals that eat mainly dead bodies of animals.

5. Herbivores :- Animals that eat plants are called herbivores.

6. Carnivores:- Animals that eat the flesh of other animals.

7. Omnivores:- Animals that eat both plants and animals.

8. Ingredients:- One of the items of food we need to make something to eat.

I. Fill in the blanks.

a.) Vitamin_____ and _______ are needed for blood clotting.

b.) Mixture of sand and sugar can be separated by _________ and _______.

c.) A child showing swollen stomach, legs become thin and skin shows ugly patches is suffering from_________.

d.) Bones and cartilage are part of______ system.

e.) Longest bone in the body________.

f.) _______ diseases is caused due to deficiency of calcium in food.

g.) _______ part of the body of fish helps in changing the direction of movement while swimming.

h.) In mixture of sugar and water, sugar is solute and water is________.

i.) Movement of bones is brought about by the contraction and relaxation of ______ and ________.

j.) ________ method is used to speed up sedimentation.

k.) The upper arm has a long bone attached to shoulder blade called________.

l.) The place where fats are mainly stored in the body is under the ______.

m.) _______ and_______ are the organs protected by rib cage.

n.) Lack of nutrients leads to __________ diseases.

o.) ____________ apparatus is used to separate two immiscible liquids.

II. True/False.

a.) Proteins and carbohydrates are required in the same amount by all age groups._____

b.) Filtration method can be used to separate sawdust and water.________

c.) In ball and socket joint, one bone moves freely on the other.______

d.) Obesity may cause heart diseases and high blood pressure._______

e.) A solution in which no more solute can be dissolve at given temperature is called unsaturated solution._________

f.) Immovable joints are present in skull bones.________

g.) Vitamin D can be made in our skin in the presence of sunlight.______

h.) Condensation is the method used to obtain salt from sea water._________

i.) All living organisms are made up only one cell._______

j.) Worms do not have bones._____

k.) Fibre cannot be digested by the body,so it is better to eliminate it from food._______

l.) Vitamin C is easily destroyed during cooking.________

m.) Solubility of sugar decreases with rise in temperature.______

n.) The biceps muscle pulls the forearm towards the body.________

o.) Sugar provide energy lesser than starch.______

III. Define terms.

a.) Skeleton

b.) Balanced diet

c.) Threshing

d.) Deficiency diseases

e.) Sedimentation

f.) Ligaments

g.) Endoskeleton

h.) Filtration

i.) Tendons

j.) Winnowing

IV. Draw a labeled diagram of (i) Distillation (ii) Locomotion in earthworm.

Physics

Answer the following.

1. How many seconds are equivalent to 5 hr 25 minutes?

2. Give two multiples of standard unit of area..

3. List two precautions while we take measurement.

4. Without using a measuring scale how can you measure the area of a small leaf correctly.

5. Find the area of a triangular field whose length measures 25 cm and breadth measures 20 cm.

CHEMISTRY

Define the following.

1. Alloy ( Two examples )

2. Homogeneous mixture ( Two examples )

3. Heterogeneous mixture ( Two examples )

4. Compounds ( Five examples )

5. Mixtures ( Five examples )

BIOLOGY

Answer the following questions:

1. Bryophytes are known as the amphibians of the plant kingdom .Why?

2. What did C. Linnaeus introduce? Give an example for the same.

3. Define the term habitat.

4. Which group among the vertebrates has streamlined body? How does it help the organism?

5. What is the significance of the name “Earthworm”

PHYSICS:

I. GRAPH:

1. Derive graphically as well as mathematically the following:

a) s = u + ½ at2, b) v = u + at, c) v2= u2 +2as

2. Draw the distance - time graph for uniform motion

3. Draw the velocity – time graph for non – uniform motion.

II. PROBLEMS:

4. During an experiment, a signal from a spaceship reached the ground station in 5min. what was the distance of the spaceship from the ground station ? the signal travels at the speed of light, that is 3 x 108 ms -1.

5. A racing car has a uniform acceleration of 4 ms-1. What distance will it cover in 10s. after start.

6. A train traveling at a speed of 90 km h-1. Brakes are applied so as to produce a uniform acceleration of -0.5 ms-1. find how far the train will go before it is brought to rest.

7. A trolley, while going down on an inclined plane has an acceleration of 2cm s-2. What will be its velocity 3s after the start ? CHEMISTRY:

III. FILL UPS :

1. In _____________________ the constituent particles are far apart.

2. In liquids the constituent particles are ____________________ packed.

3. IN _____________ the constituent particles are closely packed.

4. In gaseous state the intermolecular forces are very _____________

5. In a ____________________ the force of attraction is very strong.

6. IN gaseous state the molecules move freely , therefore the ________________ fast.

7. The foul smell from sewage is due to ______________ of gases.

8. A liquid has an open surface, but a _____________ does not have.

9. The ___________________ causes cooling.

10. ________________ state consists of super energetic and super excited particles.

IV. Define – melting point, boiling point, sublimation, evaporation, volatile substance BIOLOGY : PROJECT & SEMINAR

V. Collect more information on ELECTRON MICROSCOPE – components from net. ******************************

Q1. Leena observed the movement of fish in water. Name the body shape of fish & explain how it helps fish to move in water.

Q2. Match the following :-

         A                                     B

Cockroach             have a long backbone

Snail                      has an outer skeleton

Snake                    Shows very slow movement

Q3. Replace the underlined words with correct words in the following statements:-

a. The cartilages are harder than bones.

b. Birds like pigeon & peacock swim in water.

c. Cockroach have two pairs of legs.

d. Fixed joints are called moveable joints

e. There are 204 bones present in our body.

I. FILL UPS :

1. Milk is an _____________________ product.

2. The major sources of food are _______________ and ______________

3. Bees make ____________ from nectar of flowers.

4. Plants make their own food by the process of _________________

5. Things that are used to make a food item are known as ______________.

6. ______________ gives blue colour with iodine.

7. Balanced diet is one containing all _________________

8. Our body contains ______% of water.

9. skin, hair and nails are made up of __________

10. Deficiency diseases can be prevented by eating a _____________ diet.

II. MATCH THE FOLLOWING:

11. lion - nectar

12. Female mosquito - plants

13. Man - other animals

14. Butterfly - human blood

15. Deer - fruit juice

16.Test for fats - vitamins

17.Test for starch - proteins

18. Protective food - oily patch on paper sheet

19. vitamin C - iodine

20. Body building food - scurvy

III. MULTIPLE CHOICE QUESTIONS:

21. Which one is best for health ?

a) boiled seeds, b) roasted seeds, c) sprouted seeds

22. Animals which eat plants are called

a) herbivores, b) omnivores c) carnivores

23. Human beings are

a) herbivores, b) omnivores c) carnivores

24. Which one of the following is a cereal ?

a) rice, b) tea, c) onion

25. carrot and radish are examples of ________

a) roots, b) stem c) leaves

26. One of the following is necessary for keeping gum and teeth healthy. This is

a) vitamin B, b) vitamin A, c) vitamin C

27. The food components needed by our body are called ___________

a) ingredients, b) fragments c) ornaments

28. Vitamins and minerals are

a) protective food, b) energy food, c) roughage

29. Goitre caused by the ________________ mineral deficiency.

a) calcium, b) iodine, c) iron

30. Night blindness is caused due to deficiency of

a) vitamin A, b) vitamin B, c) vitamin C

IV. PROJECT : Collect more information on goiter and anaemia from net.

Topic : Measurement and motion

Long Question/answer-

Question 1: Give an example each of a situation where: (a) accurate measurement is necessary (b) accurate measurement is not necessary and only estimation is required Give reasons.
Answer : (a) Accurate measurements are of importance in situations where extreme precision is essential, such as in scientific experiments or in construction of fine tolerance machinery. Here even an error in measurement of weight by 0.1 g can completely change the result of an experiment. (b) Estimation will suffice in most daily, domestic situations such as the mixing sugar or salt in food items. Here, a difference of 0.1 g in the amount of salt or sugar in food will not even be noticed.

Question 2: Name the two different types of translatory motion and explain each in brief.
Answer : The two different types of translatory motion are:
1. Rectilinear/Linear motion: In this case, the object moves along a straight line path. For example, a car driving along a straight road is performing rectilinear motion.
2. Curvilinear motion: When an object moves along a curved path, then the motion is said to be curvilinear motion. A car moving on a curved road is an example of curvilinear motion.

Question 3: What is periodic motion? Explain with the help of two examples.
Answer : When motion of an object keeps repeating itself at a regular interval of time, it is said to be a periodic motion. Examples:
(a) A pendulum, i.e. a ball tied to a string, undergoes a periodic motion. (b) A swing also performs a periodic motion in a similar manner.( draw two examples)