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#### Question 1:

Fill in the blanks with the correct words.
1. Hand span is the distance between the tip of the thumb and the ........................ (tip of the little finger/arms).
2. ........................ (Iron/Wood) is a magnetic material.
3. A ........................ (clear glass/mirror) is an example of a transparent object.
4. Common sources of electric current are ........................ (cells/switch).
5. Abnormally long period of no rainfall is called ........................ (drought/flood).

1. Hand span is the distance between the tip of the thumb and the tip of the little finger.
2. Iron is a magnetic material.
3. A clear glass is an example of a transparent object.
4. Common sources of electric current are cells.
5. Abnormally long period of no rainfall is called drought.

#### Question 2:

Write T for the true statement and F for the false one. Correct the false statement(s).
1. Cubit is the distance between the middle finger and the elbow.
2. Temporary magnets are usually made of iron.
3. A shadow shows the colour of the object.
4. Some cells can be used only once. Such cells are called primary cells.
5. A dam is a solution to both drougth and flods.

1. Cubit is the distance between the middle finger and the elbow. True
2. Temporary magnets are usually made of iron. True
3. A shadow shows the colour of the object. False
(A shadow is always black, regardless of the colour of the object).
4. Some cells can be used only once. Such cells are called primary cells. True
5. A dam is a solution to both drought and flood. True

#### Question 1:

Fill in the blanks with the correct words.
1. Materials that completely block the light are called ___________ (translucent/opaque).
2. Electric ............... (current/switch) is a device that is used to open or close a circuit.
3. ...................... (Permanent/Temporary) magnets retain their magnetic properties for long period of time.
4. The distance of something from one end to the other is called ................ (length/weight).
5. ................... (Nitrogen/Oxygen) gas is the most abundant in air.

1. Materials that completely block the light are opaque.
2. Electric switch is a device that is used to open and close a circuit.
3. Permanent magnets retain their magnetic properties for a long period of time.
4. The distance of something from one end to the other is called length.
5. Nitrogen gas is the most abundant gas in air.

#### Question A.1:

"A car moving on a straight road". This motion is called
(a) curvilinear
(b) rectilinear
(c) rotational
(d) none of these

(a) rectilinear

A car moving on a straight road shows rectilinear motion.

#### Question A.2:

A moving object can have only
(a) one type of motion
(b) two types of motions
(c) three types of motion
(d) all of these

(c) three types of motion
A moving object can have translational, rotational, periodic and non-periodic motion. Thus, an object can have more than one kind of motion.

#### Question A.3:

Every magnet has
(a) 2 poles
(b) 3 poles
(c) 4 poles
(d) 1 poles

(a) 2 poles

Every magnet has two poles: south and north.

#### Question A.4:

Light always travels in a
(a) straight path
(b) curved path
(c) zig zag path
(d) all of these

(a) straight path

#### Question A.5:

Electric current flows in
(a) different directions
(b) in opposite direction
(c) particular direction
(d) none of these

(c) particular direction

An electric current flows from the positive terminal to the negative terminal.

#### Question A.6:

Water that is suitable for drinking is called
(a) polluted water
(b) potablle water
(c) salt water
(d) Both (a) and (c)

(b) potable water

Potable water is safe for drinking.

#### Question A.7:

During respiration we utilize the gas
(a) carbon dioxide
(b) nitrogen
(c) oxygen
(d) all of these

(a) oxygen

Oxygen is taken in during respiration.

#### Question A.8:

Nitrogen constitutes about .................... per cent of air.
(a) 78%
(b) 21%
(c) 0.03%
(d) 1%

(a) 78

#### Question A.9:

Air also contains
(a) noble gases
(b) dust
(c) smoke
(d) all of these

(d) all of these

Noble gases, dust and smoke, all are present in air.

#### Question A.10:

Which of these help in vermicomposting?
(a) Insects
(b) Earthworms
(c) Fungi
(d) None of these

(b) Earthworms

Earthworms help in vermicomposting by digesting organic waste materials.

#### Question A.11:

These insects respires through tiny holes on their body.
(a) Cockroaches
(b) Earthworms
(c) Rat
(d) None of these

(a) Cockroaches

Cockroaches respire through tiny holes (called spiracles) on their body.

#### Question A.12:

Lack of food in a region is called
(a) drought
(b) flood
(c) famine
(d) epidemic

(c) Famine

The widespread scarcity of food is termed as famine.

#### Question A.13:

When plants give off water vapour through their leaves, it is called
(a) evaporation
(b) transpiration
(c) condensation
(d) collection

(b) transpiration

#### Question A.14:

This device is used to open and close an electric circuit.
(a) Electric torch
(b) Electric switch
(c) Fuse
(d) None of these

(b) Electric switch

An electric switch is used to open and close an electric circuit.

#### Question A.15:

A circuit through which current cannot flow is known as
(a) close circuit
(b) open circuit
(c) short circuit
(d) electric circuit

(b) open circuit

Current cannot pass through an open circuit.

#### Question 2:

Write T for the true statement and F for the false one. Correct the false statement(s).
1. Air is a mixture of only two gases.
2. Air contains 21% of Carbon dioxide.
3. Electric current flows only if the circuit is open.
4. Sun is a natural source of light.
5. Wood is a magnetic object.

1. False
Air is a mixture of many gases, including nitrogen, oxygen, carbon dioxide and water vapour.

2. False
Air contains 21% nitrogen.

3. False
Electric current flows only if the circuit is closed.

4. True

5. False
Iron is a magnetic object.

#### Question B:

1. It attracts the metal objects
2. Any object that gives us light.
3. It is an area of darkness formed by an opaque object.
4. It is a very convenient source of electric current.
5. This can be used to control drought and flood.

1. It attracts metal objects - Magnet
2. Any object that gives us light - Luminous object
3. It is an area of darkness formed by an opaque object - Shadow
4. It is a very convenient source of electric current - Dry cell
5. It can be used to control drought and flood - Dam

#### Question C:

1. Abnormally logn period of insufficient or no rainfall is  called flood.
2. Plants take in oxygen during photosynthesis.
3. Moving air is called storm.
4. An object that gives out light of its own is called a non-lumionous object.
5. A beam is a line with an arrow that shows the direction of propagation of light.

1. Abnormally long period of insufficient or no rainfall is called flood - False
An abnormally long period of insufficient or no rainfall is called drought.

2. Plants take in oxygen during photosynthesis - False
Plants take in carbon dioxide during photosynthesis.

3. Moving air is called a storm - True

4. An object that gives out light of its own is called a nonluminous object - False
An object that gives out light of its own is called a luminous object.

5. A beam is a line with an arrow that shows the direction of propagation of light - False
A ray is a line with an arrow that shows the direction of propagation of light.

#### Question D:

 1 Lamp Candle Sun (Hint: It is not a source of artificial light.) 2 Iron Wood Plastic (Hint: it is a magnetic object.) 3 Clear glass Air Wood (Hint: This material produces a shadow.) 4 Eraser Pan Pencil (Hint: This material is a conductor.) 5 Cubit Scale Fathom (Hint: This is not an ancient method of messurement.)

The odd ones out are:
1. Sun
2. Iron
3. Wood
4. Pan
5. Scale

#### Question E.1.1:

In what way is a translucent material different from an opaque material? Give examples.

 Translucent Materials Opaque Materials Translucent materials allow the light to pass through them, but they scatter the light when it passes through. Opaque materials block the light completely. One cannot see clearly through these objects. One cannot see through these objects. Examples: Butter paper and frosted glass Examples: A log of wood and plastic

#### Question E.1.2:

Which instrument helps us to find the directions? How does it work?

A magnetic compass helps us to find directions. It has a small magnetic needle inside that rotates freely and points the Earth's north–south directions. Directions like north, south, east and west are marked on the compass.

#### Question E.1.3:

A pinhole camera is made up of a cardboard carton. It is a closed box, with a hole on one side.  Light enters the box from this hole and forms an inverted image on the side opposite to the hole.

#### Question E.1.4:

In what way is a primary cell different from a secondary cell?

 Primary Cell Secondary Cell Can be used only once Can be recharged after it has been used up or drained Example: A dry cell Example: Cells used in laptops and cellphones.

#### Question E.1.5:

Write the difference between evaporation and condensation.

 Evaporation Condensation Process by which a liquid is converted into the vapour state Process by which vapours of a substance are converted into a liquid form Example: Evaporation of water to water vapours Example: Condensation of water vapours

#### Question E.1.6:

Give two uses of dams.

Two uses of dams are:

• Dams hold back water and prevent floods.
• Dams help in generating electricity.

#### Question E.1.7:

What is a stomata? Where is it found?

Stomata are tiny pores that help in the gaseous exchange in plants. They are found under the surface of a leaf.

#### Question E.1.8:

The wastes that can be degraded by the action of decomposers are called biodegradable wastes, for example, dead plants and animals, fruit and vegetable peels and animal excreta.

#### Question E.1.9:

What are decomposers? Give two examples.

The microorganisms found in the soil that can decay dead plants and animals are called decomposers.

Examples: Bacteria and fungi

#### Question E.1.10:

Give four examples of transparent materials.

The examples of transparent materials are clean water, clear air, cellophane paper and clear glass.

#### Question E.2.1:

Differentiate between rectilinear and curvilinear motion.

 Rectilinear Motion Curvilinear Motion When an object moves in a straight line, it is said to be in a rectilinear motion. When an object moves along a curved path, it is said to be in a curvilinear motion. Example: A bike moving on a straight road Example: A car taking a turn

#### Question E.2.2:

What is a north pole and south pole in a magnet?

Conventionally, the two ends of a magnet are known as two poles; they are north and south poles. They always exist in pairs and cannot be separated.

#### Question E.2.3:

Describe the structure of an electric torch.

An electric torch consists of one or more dry cells (as a source of electricity) connected to a small bulb and a switch. When it is switched on, the circuit gets completed and the bulb glows. When it is switched off, the circuit breaks and the bulb stops glowing.

#### Question E.2.4:

What are the natural disasters? Write their names.

Natural disasters are major adverse events triggered by natural processes on the earth. They include earthquake, tsunami, volcanoes, cyclones etc. They cause a large destruction of life and property and affect the livelihoods of people.

#### Question E.2.5:

Name some aquatic animals. How do they breathe?

Fish, crab, tadpole and shrimp are examples of aquatic animals. They breathe through gills, which help in taking in oxygen and giving out carbon dioxide.

#### Question F.1.1:

Write a short note on translational motion.

Translational motion is a type of motion in which the same distance in a given time is covered by all parts of an object, for example, a car moving on the road and birds flying in the sky.
Translational motion is of two types: rectilinear and curvilinear.
In rectilinear motion, the object moves in a straight line, for example, a train moving on a straight track.
In curvilinear motion, the object moves along a curved path, for example, a car taking a turn.

#### Question F.1.2:

Are magnets useful to us? If yes describe their uses.

Yes, magnets are very useful to us. Their uses are as follows:

• A magnetic strip is used in credit cards, ATM cards and identity cards to store information.
• A magnet is used in television and computer monitors.
• Magnetic materials are used in computer hard disc and audio and video cassettes to store information.
• Materials made up of iron are picked up by magnets from the scrap yard.

#### Question F.1.3:

Define water cycle? Explain in detail.

Water cycle is the cyclic flow of water from the atmosphere to the earth and then back to the atmosphere through various processes.

Water in various water bodies gets evaporated by the heat of the sun. This evaporated water goes up in the atmosphere. The water droplets in the air condense to form clouds. When the droplets become too heavy to be held back in the clouds, they drop down as rain on the earth. This rainwater evaporates and forms clouds again. Thus, there is a cyclic flow of water between the atmosphere and the earth; it is termed as the water cycle.

#### Question F.1.4:

Describe the harmful effects of air pollution.?

The harmful effects of air pollution are as follows:

• It adversely affects the health of animals, plants and humans.
• It makes breathing difficult because of the presence of harmful gases in the air.
• It leads to lung cancer, asthma and other respiratory problems.
• It also damages crops.

#### Question F.1.5:

What do you understand by 3Rs? Explain them.