This paper consists of seven questions. All the questions ...€¦ · Inclined plane(0.5)- to load or unload a truck(0.5) 2. Pulley(0.5)- used to draw water from well(0.5) h) Delhi

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DATE: CLASS: IV-____ SUBJECT: Science TIME: 2 ½ HRS. M.M: 60 Student’s Name: ________________ Roll No: ________ No. of Pages: 03 Invigilator’s Signature: _____

General Instructions:

• This paper consists of seven questions. • All the questions are compulsory. • Read the questions carefully before attempting. • Attempt all the parts of a particular question together. • Write the number of question as mentioned in the question paper. • Do not write anything on the question paper.

Q.1 Choose the correct option- 10 i) ‘X’ is a substance that has a definite volume but no fixed shape. ‘X’ could be- a) Chalk b) Milk c) Wood d) Spoon ii) Which of the following is an egg laying mammal? a) Platypus b) Duck c) Rabbit d) Sheep iii)Which one of these is a marsupial? a) Lion b) Rat c) Kangaroo d) Giraffe iv)Which of these is used to kill germs present in water? a) Condensation b) Evaporation c) Decantation d) Boiling v) Which of the following is not an amphibian? a) Toad b) newt c) Salamander d) Bat vi) __________________ hibernate during winter season. a) Cow b) Mice c) Leech d) Cats vii) The first man-made satellite launched in 1957- a) Sputnik-I b) Apple c) Apollo d) Aryabhatta viii) During photosynthesis, solar energy is converted into _________ energy. a) Light b) Sound c) Heat d) Chemical ix) The force that stops a ball from rolling on its own- a) Friction b) Muscular c) Magnetic d) Electrical x) The planet with a very prominent and beautiful set of rings- a) Mercury b) Saturn c) Neptune d) Mars

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Q.2 Name these- 5 a) The process in which heavier impurities settle down - b) The process by which living things produce more of their own kind- c) The process of developing special features for survival- d) The force applied with the help of tools- e) A wall built across a river which holds back water and creates a reservoir- Q.3 Define the terms- 5 a) Molecules b) Moulting c) Habitat d) Axis e) Energy Q.4 Give reason- 5

a) Filtration is a better process than decantation.

b) A whale is a mammal and not a fish.

c) Camel can survive in the desert easily.

d) A coin thrown up in the air falls back to the ground.

e) Artificial satellites are important.

Q.5 Correct the given statements and rewrite them- 5

a) Gases have fixed shape and volume.

b) The cluster of frog’s eggs is known as spiracles.

c) The various stages of development from an embryo to the adult are known as hatching.

d) Moving water has a lot of energy known as turbine.

e) Wells are openings in the Earth’s crust through which molten lava, steam or fumes escape.

Q.6 Answer in short- (2 marks each) 18

a) 1. Identify ‘X’ and ‘Y’. 2. Write importance of each.

b) The life cycle of a frog is an example of metamorphosis. Justify your answer by writing two differences between the tadpole and the adult frog.

c) Explain any two adaptive features of a bird or a fish that help it to survive in its surroundings.

d) Differentiate between scavengers and parasites. (Any 2 points)

e) Reena went to a bird sanctuary and wondered to see some migratory birds over there. As her friend what will you explain to her about ‘migration’? Give one example of a migratory bird.

Y

X



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f) What would happen if the axis of the Earth was not tilted?

g) “Machines make our work easier, faster and more convenient”. Identify these simple machines and

write one use of each.

1. 2.

h) Delhi Government recently launched Odd-Even car formula to fight the menace of extreme pollution.

As a responsible citizen of the country, suggest two fuels that should be used less as they cause a lot of

pollution and two environment-friendly fuels.

i) 1. Look at the picture carefully and tell which season would you

observe in Northern hemisphere and why?

2. If Sameer plans his vacation to Australia in June, what type of

clothes should he pack for himself? Why?

Q.7 Answer in detail- (3 marks each) 12 a) Identify the following animals and write one adaptive feature of each based on the clue given. i) ii) iii)

Clues: (For living on trees) (To protect from cold) (to escape from enemies) b) Explain the life cycle of a butterfly with the help of a neat and labeled diagram only. c) i) What do you mean by ‘force’? ii) In the given pictures, Seema and Sam both are applying force. Choose and write your observation from the given options. 1. Work is done in both cases. 2. Only Sam is doing work. 3. Only Seema is doing work. 4. No work is done in both cases. iii) When is work said to be done, according to Science? d) Describe the three main layers of the Earth.



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ANSWERKEY

DATE: CLASS: IV-____ SUBJECT: Science

Q.1 Choose the correct option- 1x10=10 i) ‘X’ is a substance that has a definite volume but no fixed shape. ‘X’ could be- a) Chalk b) Milk c) Wood d) Spoon

ii) Which of the following is an egg laying mammal? a) Platypus b) Duck c) Rabbit d) Sheep

iii)Which one of these is a marsupial? a) Lion b) Rat c) Kangaroo d) Giraffe

iv)Which of these is used to kill germs present in water? a) Condensation b) Evaporation c) Decantation d) Boiling

v) Which of the following is not an amphibian? a) Toad b) newt c) Salamander d) Bat

vi) __________________ hibernate during winter season. a) Cow b) Mice c) Leech d) Cats

vii) The first man-made satellite launched in 1957- a) Sputnik-I b) Apple c) Apollo d) Aryabhatta

viii) During photosynthesis, solar energy is converted into _________ energy. a) Light b) Sound c) Heat d) Chemical

ix) The force that stops a ball from rolling on its own- a) Friction b) Muscular c) Magnetic d) Electrical

x) The planet with a very prominent and beautiful set of rings- a) Mercury b) Saturn c) Neptune d) Mars

Q.2 Name these- 1x5=5 a) The process in which heavier impurities settle down - Sedimentation b) The process by which living things produce more of their own kind- Reproduction c) The process of developing special features for survival- Adaptation d) The force applied with the help of tools-Mechanical e) A wall built across a river which holds back water and creates a reservoir- Dam

Q.3 Define the terms- 1x5=5 a) Molecules- Tiny, invisible particles(0.5) that form matter(0.5) b) Moulting- The process of shedding old skin (1) c) Habitat- The home or natural surroundings of a living thing(1) d) Axis- Imaginary line that runs through the centre of earth(0.5) from North pole to the South pole (0.5) e) Energy- the ability or capacity to do work(1) Q.4 Give reason- 5

a) Filtration is a better process than decantation. As it can even remove the floating impurities (1)

b) A whale is a mammal and not a fish. As it gives birth to young ones/ breathes through lungs (1)

c) Camel can survive in the desert easily. As it can store food and water in its body (1)

d) A coin thrown up in the air falls back to the ground. Due to the gravitational pull of the earth. (1)

e) Artificial satellites are important. As they help in weather forecasting, communication and studying

space (any two uses)(1)



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Q.5 Correct the given statements and rewrite them- 5 a) Gases have fixed shape and volume. Solids b) The cluster of frog’s eggs is known as spiracles. Spawn c) The various stages of development from an embryo to the adult are known as hatching. Life cycle d) Moving water has a lot of energy known as turbine. Hydroenergy e) Wells are openings in the Earth’s crust through which molten lava, steam or fumes escape. Volcanoes

Q.6 Answer in short- (2 marks each) 18 a) 1. Identify ‘X’ and ‘Y’. Ans. X- Albumen(0.5) Y-Yolk(0.5)

2. Write importance of each. Ans. Albumen is rich in proteins. (0.5) Yolk provides food (fats, vitamins, minerals) to the embryo(0.5)

b) The life cycle of a frog is an example of metamorphosis. Justify your answer by writing two differences between the tadpole and the adult frog.

Ans. The tadpole has fins and tail to swim in water whereas adult frog has limbs and no tail. (1)

The tadpole breathes through gills in water and adult frog through lungs on land. (1)

c) Explain any two adaptive features of a bird or a fish that help it to survive in its surroundings. Ans Birds- streamlined body shape to cut through air/Forearms changed into wings/ hollow bones 2pts-1M OR Fish- streamlined body shape to cut through water/fins to swim in water/ gills to breathe in water 2pts-1M

d) Differentiate between scavengers and parasites. (Any 2 points)

Ans. Scavengers Parasites 1. feed on the flesh of dead animals (0.5) 1. Derive nutrition from the body of the host. (0.5) 2. help in keeping environment clean. (0.5) 2. Cause diseases in the host’s body. (0.5)

e) Reena went to a bird sanctuary and wondered to see some migratory birds over there. As her friend what will you explain to her about ‘migration’? Give one example of a migratory bird.

Ans. Migration means the mass movement of animals (0.5) in order to escape extreme cold weather (0.5) and shortage of food. (0.5) e.g. Arctic tern/ Siberian crane (0.5)

f) What would happen if the axis of the Earth was not tilted? Ans. Both the hemispheres would get same amount of heat (1); there would be no change of seasons(1)

g) “Machines make our work easier, faster and more convenient”. Identify these simple machines and write one use of each.

1. 2.

Ans. 1. Inclined plane(0.5)- to load or unload a truck(0.5) 2. Pulley(0.5)- used to draw water from well(0.5)

h) Delhi Government recently launched Odd-Even car formula to fight the menace of extreme pollution. As a responsible citizen of the country, suggest two fuels that should be used less as they cause a lot of pollution and two environment-friendly fuels.

Ans. Petrol and diesel should be used less. (1) CNG and biogas are environment friendly (1)

i) 1. Look at the picture carefully and tell which season would you observe in Northern hemisphere and why? Ans. NH- Summer(0.5) as it is tilted towards the sun/ receives more heat (0.5) 2. If Sameer plans his vacation to Australia in June, what type of clothes should he pack for himself? Why? Ans. Woollen clothes(0.5) as there is winter season(0.5).



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Q.7 Answer in detail- (3 marks each) 12

a) Identify the following animals and write one adaptive feature of each based on the clue given. i) ii) iii)

Clues: (For living on trees) (To protect from cold) (to escape from enemies) Ans. i) Monkey (0.5)-Sharp claws/long muscular tail/strong muscular limbs (0.5) ii) Penguin (0.5)- thick layer of fat called blubber under the skin (0.5) iii) Stick insect(0.5)- can merge with the surroundings/ can camouflage(0.5) b) Explain the life cycle of a butterfly with the help of a neat and well-labeled diagram only. Ans. Each labeling (0.5). If only diagram, no label then 1M. c) i) What do you mean by ‘force’? Ans. Force is a push or a pull acting on an object, (1) ii) In the given pictures, Seema and Sam both are applying force. Choose and write your observation from the given options. 1. Work is done in both cases. 2. Only Sam is doing work. 3. Only Seema is doing work. (1) 4. No work is done in both cases. iii) When is work said to be done, according to Science? Ans. When an object changes its position on applying force, work is said to be done. (1) d) Describe the three main layers of the Earth. Ans. The earth has three main layers-

i) Crust(0.5)- outermost solid layer which has mountains, rivers, plains etc. (0.5)

ii) mantle(0.5)- Middle layer, upper mantle is solid while lower mantle contains magma(0.5)

iii) Core(0.5)- Innermost layer, outer core is hot liquid and inner core,a solid ball of iron(0.5)



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Documents

This paper consists of seven questions. All the questions ...€¦ · Inclined plane(0.5)- to load or unload a truck(0.5) 2. Pulley(0.5)- used to draw water from well(0.5) h) Delhi