CBSE Class 6 Science Chapter 12 : Electricity and Circuits Fill in the blanks

CBSE Class 6 Science 

Chapter 12 :  Electricity and Circuits

 Fill in the blanks

1. Electricity to the bulb in a torch is provided by --------------
2. In an electric cell, the metal cap is the -----------terminal whereas metal disc is -------terminal
3. An electric cell produces electricity from the -------------- stored inside it.
4. The thin wire that gives off light in a bulb is called ------------- of the bulb
5. In an electric circuit, the direction of current is from ---------------- terminal to ----------terminal of the electric cell
6. A ----------- is a simple device that either breaks the circuit or completes it
7. -------------- do not allow electric current to pass through them. 
8. Air is an example for ------------.
9. Switches, electrical plugs and sockets are made of -------------------.
10. An electric bulb glows when ----------------------- passes through it

Answers

1. Electric cell
2. Positive, Negative
3. chemicals
4. filament
5. Positive, Negative
6. Switch
7. Insulators
8. Insulator
9. conductors
10. electric current

CBSE Class 6 Science Chapter 11 : Light, Shadows and Reflections NCERT Solutions

CBSE Class 6 Science 

Chapter 11 :  Light, Shadows and Reflections

 NCERT Solutions

1. Rearrange the boxes given below to make a sentence that helps us understand opaque objects.

Answer:

2. Classify the objects or materials given below as opaque, transparent or translucent and luminous or non-luminous:

Air, water, a piece of rock, a sheet of aluminium, a mirror, a wooden board, a sheet of polythene, a CD, smoke, a sheet of plane glass, fog, a piece of red hot iron, an umbrella, a lighted fluorescent tube, a wall, a sheet of carbon paper, the flame of a gas burner, a sheet of cardboard, a lighted torch, a sheet of cellophane, a wire mesh, kerosene stove, sun, firefly, moon

Answer:

3. Can you think of creating a shape that would give a circular shadow if held in one way and a rectangular shadow if held in another way?

Answer:

We can get both circular and rectangular shadow when we allow light to fall on a cylindrical object. When light falls on top and bottom of a cylindrical shaped object, we will get a circular shadow and if lights falls on the sides of the cylinder, we get a rectangular shaped shadow.

4. In a completely dark room, if you hold up a mirror in front of you, will you see a reflection of yourself in the mirror?

Answer:

An image is formed in a plane mirror due the reflection of light by the mirror. If there is no light in the room, there is no reflection happens and no image is formed. Hence we cannot see our image in a completely dark room

CBSE Class 6 Science Chapter 11 : Light, Shadows and Reflections Additional Questions

CBSE Class 6 Science 

Chapter 11 :  Light, Shadows and Reflections

 Additional Questions

1.  What are luminous objects? Give two examples
2.  What are opaque, transparent and  translucent objects? Give one example each
3.  How does the shadow formed? 
4.  How can we make a simple pin hole camera?
5.  Give an example of a pin hole camera, which we see in nature
6.  Give an experiment which shows that light travels in a straight line
7. What is mean by rectilinear property of light?

 Answers

1.  Objects that give out or emit light of their own are called luminous objects. Examples of luminous objects are sun, torch.
2. The Objects which does not allow light to pass through it are called opaque objects. Wood is an example for an opaque object . The objects which allow light to pass through it are called transparent objects. Example for a transparent object is glass. The objects which partially allows light to pass through it are called translucent objects. Ice is an example for a translucent object.
3. Light travels in a straight line. Shadow is formed, when a opaque or translucent object is kept in the path of a light source.
4. Take two boxes so that one can slide into another with no gap in between them. Cut open one side of each box. On the opposite face of the larger box, make a small hole in the middle.In the smaller box, cut out from the middle a square with a side of about 5 to 6 cm. Cover this open square in the box with tracing paper (translucent screen). Slide the smaller box inside the larger one with the hole, in such a way that the side with the tracing paper is inside. This is how we can a make a pin hole camera at home.
5. The small patches of sun light the tree covered with large number of leaves are the pin hole images of the sun. In this case,the gaps between the leaves, act as the pin holes.
6. Take a rubber tube. Light a candle and fix it on a table. Now look the lighted candle through the pipe by holding it straight. The candle is visible now. Slightly bend the rubber tube and look at the same candle. The candle is not visible. This activity shows that light travels in a straight line.
7. Light travels in a straight line. This is called the rectilinear property of light.

CBSE Class 6 Science Chapter 11 : Light, Shadows and Reflections Fill in the blanks

CBSE Class 6 Science 

Chapter 11 : Light, Shadows and Reflections

 Fill in the blanks

1. The object which emit light of their own are called -----------------
2.  --------------------- is an example for luminous object.
3.  The objects with which we can see but not very clearly are called ------------objects.
4.  Wood is an example for ----------------object
5. To see a shadow we need a opaque object and a --------------
6. light travels along a -------------------.

Answers

1. luminous objects.
2. Sun
3. Translucent
4. opaque
5. source of light
6. straight line

CBSE Class 6 Science Chapter 10 : Motion and Measurement of Distances NCERT Solutions

CBSE Class 6 Science 

Chapter 10 :  Motion and Measurement of Distances

                   NCERT Solutions                          

1. Give two examples each, of modes of transport used on land, water and air.

Answer:
Land: Bus, car
Water:  Boat, ship
Air : Aeroplane, Helicopter

2. Fill in the blanks:
(i) One metre is ______________ cm.
(ii) Five kilometre is ______________ m.
(iii)Motion of a child on a swing is ______________.
(iv)Motion of the needle of a sewing machine is ______________.
(v) Motion of wheel of a bicycle  is______________.

Answer:
(i) 100.
(ii) 5000
(iii) Periodic motion
(iv) Periodic motion
(v)  Circular motion

3. Why can a pace or a footstep not be used as a standard unit of length?

Answer:
We cannot use footstep as a standard unit of length because the size of the foot varies from person to person.

4. Arrange the following lengths in their increasing magnitude:
1 metre, 1 centimetre, 1 kilometre,1 millimetre.

Answer:
1 millimetre < 1 centimetre < 1 metre < 1 kilometre

5.    The height of a person is 1.65 m. Express it into cm and mm.

Answer:

1m = 100cm

1.65m = 1.65 X 100cm = 165cm

1m = 1000mm

1.65m = 1.65 X 1000 = 1650mm

6. The distance between Radha's home and her school is 3250 m. Express this distance into km.

Answer:

Hence the distance between Radha's home and school is 3.25km

7. While measuring the length of a knitting needle, the reading of the scale at one end is 3.0 cm and at the other end is 33.1 cm. What is the length of the needle?

Answer:
Length of the needle = 33.1 - 3 cm = 30.1cm

8. Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.

Answer:
The motion of the wheels of the bicycle and that of the leaves of the fan are similar. Both are in circular motion. But in the case of bicycle, the bicycle moves in a straight path when the wheel is in circular motion. Hence it has both circular and rectilinear motion. In the case of fan, there is no movement to the fan when the leaves rotates. Hence it has only circular motion

9. Why could you not use an elastic measuring tape to measure distance? What would be some of the problems you would meet in telling someone about a distance you measured with an elastic tape?

Answer:
The elastic measuring tape is stretchable. Hence we use elastic measuring table we get different answers depending on the force we use to stretch the tape

10. Give two examples of periodic motion.

Answer:
Oscillations of a pendulum and motion of a child sitting in swing are examples of periodic motion

CBSE Class 6 Science Chapter 10 : Motion and Measurement of Distances Additional Questions

CBSE Class 6 Science Chapter 10 : Motion and Measurement of Distances Fill in the blanks

CBSE Class 6 Science 

Chapter 10 :  Motion and Measurement of Distances

Fill in the blanks

1.  Invention of the ------------ made a great change in modes of transport.
2.  ----------------  were made for steam engine driven carriages and wagons
3.  -------------means the comparison of an unknown quantity with some known quantity.
4.  Length from the elbow to the finger tips is known as -----------------.
5. In 1790, the ---------- created a standard unit of measurement called the metric system. 
6. The system of units now used is known as the ---------------.
7. The SI unit of length is a -------.
8. ------------- the unit is used to measure large distances.
9. We can use a ------------- to measure the length of curved line.
10. The type of motion in the which the objects move along a straight line is called a ----------motion
11. --------------- is an example for a circular motion.
12. Motion of a child on a swing is an example for a ---------------- motion

Answers

1. Wheel
2. Railroads
3. measurement
4. cubit
5. French
6. International System of Units
7. metre
8. Kilometre
9. thread
10. rectilinear
11. movement of hands of a clock
12. periodic motion

CBSE Class 6 Science Chapter 9: The Living Organisms and Their Surroundings NCERT Solutions

CBSE Class 6 Science 

Chapter 9: The Living Organisms and Their Surroundings

NCERT Solutions

1. What is a habitat?

Answer:

The surroundings where organisms live is called a habitat. The meaning of habitat is a dwelling place. Every organisms depend their habitat for their food, water, air, shelter and other needs. Several kinds of plants and animals may share the same habitat.

2. How are cactus adapted to survive in a desert?

Answer:

Cactus is a desert plant. It does not have leaves, hence there will not be lose of water through transpiration . Its stem is covered with a thick waxy layer, which helps to retain water . It has roots that go very deep into the soil for absorbing water.

3. Fill up the blanks

(a) The presence of specific features, which enable a plant or an animal to live in a particular habitat, is called ----------------------.

(b) The habitats of the plants and animals that live on land are called ------------------- habitat.

(c) The habitats of plants and animals that live in water are called ------------- habitat.

(d) Soil, water and air are the ------------- factors of a habitat.

(e) Changes in our surroundings that make us respond to them, are called ----------------- .

Answer:

(a)  adaptation
(b)  terrestrial
(c)  aquatic

(d)  abiotic
(e)  stimuli

4. Which of the things in the following list are nonliving?

Plough, Mushroom, Sewing machine, Radio, Boat, Water hyacinth, Earthworm

Answer:
The non living things are Plough, Sewing machine, Radio, Boat

5. Give an example of a non-living thing, which shows any two characteristics of living things.

Answer:
Cloud is a non living thing, but which shows the characteristics of a living thing like it shows movement, and it grows

6. Which of the non-living things listed below, were once part of a living thing?

Butter, Leather, Soil, Wool, Electric bulb, Cooking oil, Salt, Apple, Rubber

Answer:
Butter, Leather, Wool, Cooking oil, Apple, Rubber

7. List the common characteristics of the living things.

Answer:

The Characteristics of a living thing are

• Living things need food for their survival
• Living things grow 
• Living things respire
• Living things excrete
• Living things reproduce
• Living things respond to stimuli
• Living things move
• Living things die

8. Explain, why speed is important for survival in the grasslands for animals that live there. (Hint: There are few trees or places for animals to hide in grasslands habitats.)

Answer:
Grasslands has very less trees and lot of open spaces. Hence they have run long distances to catch their prey as well as to find a proper hiding place to escape from the predators. Hence speed is very important for the animals who live in the grasslands.

CBSE Class 6 Science Chapter 9: The Living Organisms and Their Surroundings Fill in the blanks

CBSE Class 6 Science 

Chapter 9: The Living Organisms and Their Surroundings

Fill in the blanks

1.  ------------ protect the fish and also help in easy movement through water. 
2. The surroundings where organisms live is called a ------------.
3. Habitat means a ------------------. 
4. ---------------- is an example of terrestrial habitat.
5. Swamp is an example of ---------- habitat.
6. In cactus, photosynthesis is usually carried out by the ------------. 
7. The mountain goat has strong -------------- for running up the rocky slopes of the mountains. 
8. Sea animals like dolphins and whales breath through-----------------.
9. Breathing is part of a process called ------------------.
10. Through -------------  the body obtains energy from the food it takes. 
11. earthworms breathe through their ------------.
12. Exchange of gases in plants mainly takes place through their  ---------------.

Answers

1. Scales 
2. habitat
3. dwelling place 
4. forest
5. aquatic
6. stems
7. hooves. 
8. nostrils or blowholes
9. respiration
10. respiration 
11. skin. 
12. leaves. 

CBSE Class 6 Science Chapter 9 The Living Organisms and Their Surroundings Additional questions

CBSE Class 6 Science 

Chapter 9: The Living Organisms and Their Surroundings

Additional Questions

1. How does the structure of the camel helps it to survive in desert conditions?
2. How does the structure of the fish helps it to live in water?
3. What is mean by adaptation?
4. What is mean by habitat?
5. Name the types of habitats with examples
6. What is mean by acclimatisation?
7. What are the two components of a habitat? Give examples
8. What does the desert animals like snacks and rats do to stat away the intense heat of the desert? 
9. What are adaptations of the desert plants, which helps them to survive in the hot desert region?
10. How does the structure of the plants and animals in the mountain region helps them to survive in the region?
11. Give some examples for the structure of animals which helps them to survive them in the cold mountain regions.
12. How does lion and deer adapted to its surroundings?
13. How do animals like dolphins and whales breath?
14. What is the function of roots in terrestrial  and aquatic plants?
15. Explain the leaf structure of the aquatic plants which are fully submerged in water?
16. How does the structure of frog help it to survive in both water and land?
17. How does plants excrete?
18. What are the characteristic of a living things?

Answers

1. Camels have long legs which help to keep their bodies away from the heat of the sand. They excrete small amount of urine, their dung is dry and they do not sweat. Since camels lose very little water from their bodies, they can live for many days without water. 
2. Fishes have streamlined shape, which help them to move inside water. Their slippery scales protects them and help in easy movement through water. Flat fins and tails  help them to change directions and keep their body balance in water. Gills present in the fish help them to use oxygen dissolved in water.
3. The presence of specific features or certain habits, which enable a plant or an animal to live in its surroundings, is called adaptation.
4. The surroundings where organisms live is called a habitat. The meaning of habitat is a dwelling place. Every organisms depend their habitat for their food, water, air, shelter and other needs. Several kinds of plants and animals may share the same habitat.
5. There are two types of habitats. They are terrestrial habitat and aquatic habitat. Examples of terrestrial habitats are forests, grasslands, deserts, coastal and mountain regions. Ponds, swamps, lakes, rivers and oceans are some examples of aquatic habitats
6. Small changes that take place in the body of a single organism over short periods, to overcome small problems due to changes in the surroundings, are called acclimatisation.
7.  The two components of habitat are biotic components and abiotic components. Plants and animals are biotic components, where as rocks, soil air and water are abiotic components of the habitat.
8. To stay away from the intense heat during the day, they stay in burrows deep in the sand. These animals come out only during the night, when it is cooler. 
9. Desert plants lose plants lose very little water through transpiration. The leaves in desert plants are either absent, very small, or they are present in the shape of spines. This helps in reducing loss of water from the leaves through transpiration. The stem is also covered with a thick waxy layer, which helps to retain water. Most desert plants have roots that go very deep into the soil for absorbing water.
10. Most of the trees in the mountain region are normally shaped and have sloping branches. The leaves of some of these trees are needle-like. This helps the rainwater and snow to slide off easily. Animals living in the mountain regions have thick skin or fur to protect them from cold. 
11. Yaks have long hair to keep them warm. Snow leopard has thick fur on its body including feet and toes. This protects its feet from the cold when it walks on the snow. The mountain goat has strong hooves for running up the rocky slopes of the mountains.
12. The light brown colour of the lion helps it to hide in dry grasslands when it hunts for prey. The eyes in front of the face allow it to have a correct idea about the location of its prey. Where as the long ears of the deer helps them to hear movements of predators. The eyes on the side of its head allow it to look in all directions for danger.  The speed of the deer helps them to run away from the predators. It has strong teeth for chewing hard plant stems of the forest.
13.  Dolphins and whales that do not have gills. They breathe in air through nostrils or blowholes that are located on the upper parts of their heads. This allows them to breathe in air when they swim near the surface of water. They can stay inside the water for a long time without breathing. They come out to the surface from time to time, to breath.
14. In terrestrial plants, roots normally play a very important role in the absorption of nutrients and water from the soil. However, in aquatic plants, roots are much reduced in size and their main function is to hold the plant in place.
15. Some of these plants, which are completely submerged in water have narrow and thin ribbon-like leaves.  These can bend in the flowing water. In some submerged plants, leaves are often highly divided, through which the water can easily flow without damaging them.
16. Frogs can stay both inside the pond water as well as move on land. They have strong back legs that help them in leaping and catching their prey. They have webbed feet which help them swim in water
17. Some harmful or poisonous materials do get produced in plants as wastes. Some plants find it possible to store the waste products within their parts in a way that they do not harm the plant as a whole. Some plants remove waste products as secretions.
18. The Characteristics of a living thing are

• All living things need food for their survival: plants make their own food through the process of photosynthesis. Animals depend on plants and other animals for their food.
• All living things grow : All living things shows growth.
• All living things respire: Respiration is necessary for all living organisms. It is through respiration that the body finally obtains energy from the food it takes.
• All living things excrete:  All living organisms get rid of waste from their body
• All living things reproduce: All living things reproduce their own kind. There are different modes of reproduction in animals and plants
• All living things respond to stimuli
• All living things move
• All living things die

CBSE Class 6 Science Chapter 8 Body Movements Additional Questions

CBSE Class 6 Science 

Chapter 8: Body Movements

Additional Questions

1. What is ball and socket joint? In which direction in allow movements?
2. What are types of movements in pivotal joints?
3. What is fixed joint? Give en example for this.
4. What is skeleton?
5. How X-ray's useful in treatment of injuries?
6. What is a rib cage?
7. What is cartilage?
8. How the muscles help in the movement of bone?
9. Explain the movement of earthworm in soil.
10. How does earthworm fix parts of its body to the ground?
11. How does the earthworm helps the plants during its movements?
12. Explain the movement of cockroaches
13. How does shape of the fish help its movement?
14. How does the muscles help the fishes to swim in water?
15. What is the role of fins in the movement of fish?
16. Explain the movement of snakes

Answers

1. Ball and socket joint is a joint in which the rounded end of one bone fits into the cavity(hollow space) of the other bone. Ball and socket joint allows movement in all the directions.
2. Pivotal joint allow us to bend our head forward and backward and also allow turning right or left
3. There are some joints, which we cannot move because they are joined together at some joints. Such joints are called fixed joints. The joint between the upper jaw and the rest of the head is an example for fixed joint.
4. All the bones in our body form a framework to give a shape to our body. This framework is called the skeleton.
5. The X-rays show the shapes of the bones in our bodies. Doctors use these X-ray images to find out any possible injuries that might have happened to the bones. 
6. Rib cage join the chest bone and the backbone together to form a box. It gives protection to internal organs like heart, lungs etc
7. Cartilages are the parts of the skeleton that are not as hard as the bones. Cartilages can be bent.
8. Muscles work in pairs. When one of them contracts, the bone is pulled in that direction. The other muscle of the pair relaxes. To move the bone in the opposite direction, the relaxed muscle contracts to pull the bone towards its original position, while the first relaxes. A muscle can only pull. It cannot push. Thus, two muscles have to work together to move a bone.
9. An earthworm does not have bones. It has muscles which help to extend and shorten the body.  During movement, the earthworm first extends the front part of the body, keeping the rear portion fixed to the ground. Then it fixes the front end and releases the rear end. It then shortens the body and pulls the rear end forward. This makes it move forward by a small distance. Repeating such muscle expansions and contractions, the earthworm can move through soil. The body secretes a slimy substance to help the movement.
10. There are large number of tiny bristles projected out under the body of an earthworm. These bristles, which  are connected with muscles  help the earthworm to get a good grip on the ground.
11. The earthworm eats during its movement through the soil and throws away the undigested part of the material that it eats. This is makes the soil fertile and helps the growth of the plants
12. Cockroaches walk and climb as well as fly in the air. They have three pairs of legs. These help in walking. The body is covered with a hard outer skeleton. This outer skeleton is made of different units joined together and that permits movement. There are two pairs of wings attached to the breast. The cockroaches have distinct muscles. the muscles near the legs move the legs for walking. The breast muscles move the wings when the cockroach flies.
13. The head and tail of the fish are smaller than the middle portion of the body. This body shape is called streamlined. Because of this shape water can flow around it easily and allow the fish to move in water.
14. The skeleton of the fish is covered with strong muscles. During swimming, muscles make the front part of the body curve to one side and the tail part swings towards the opposite side and thus fish form a curve. Then, quickly, the body and tail curve to the other side. This makes a jerk and pushes the body forward. A series of such jerks make the fish swim ahead. This is helped by the fins of the tail.
15. Fins help to keep the balance of the body and to keep direction, while swimming.
16. Snakes have a long backbone. They have many thin muscles. They are connected to each other even though they are far from one another. They also interconnect the backbone, ribs and skin. The snake’s body curves into many loops. Each loop of the snake gives it a forward push by pressing against the ground. Since its long body makes many loops and each loop gives it this push, the snake moves forward very fast and not in a straight line.

CBSE Class 6 Science Chapter 8 Body Movements NCERT Solutions

CBSE Class 6 Science 

Chapter 8: Body Movements

NCERT Solutions

1. Fill in the blanks:

(a) Joints of the bones help in the ——————— of the body.

(b) A combination of bones and cartilages forms the _______ of the body.

(c) The bones at the elbow are joined by a ______________________ joint.

(d) The contraction of the _____________ pulls the bones during movement.

Answer:

(a) movement

(b) skeleton

(c) hinge

(d) muscles

2. Indicate true (T) and false (F) among the following sentences.

(a) The movement and locomotion of all animals is exactly the same. ( )

(b) The cartilages are harder than bones. (      )

(c) The finger bones do not have joints. (      )

(d) The fore arm has two bones. ( )

(e) Cockroaches have an outer skeleton. ( )

Answer:

(a) False

(b) False

(c) False

(d) True

(e) True

3. Match the items in Column I with one or more items of Column II.

Answer:

Upper Jaw -- is an immovable joint

Fish -- have fins on the body

            have a streamlined body

Ribs -- protect the heart

Snail -- Shows very slow movement

             has an outer skeleton

Cockroach -- can fly in the air

                      has an outer skeleton

4. Answer the following:

(a) What is a ball and socket joint?

(b) Which of the skull bones are movable?

(c) Why can our elbow not move backwards?

Answer:

(a) In ball and socket joint,  the rounded end of one bone fits into the cavity (hollow space) of the other bone.  Such a joint allows movements in all directions

(b) Only lower jaw is movable in skull.

(c) Joint in elbow is hinge joint, which allows movement only in one direction. Hence we cannot move our elbow backwards.

CBSE Class 6 Science Chapter 8 Body Movements Fill in the blanks

CBSE Class 6 Science 

Chapter 8: Body Movements

Fill in the blanks

1. We can bend or move our body only at -------------.
2. The points where the bones meet are called -------------.
3. -------------joints allow movements in all directions.
4. The joint where our neck joins with the head is a -----------------joint
5. In a pivotal joint a ------------- bone rotates in a ring
6. The joint in elbow is an example of --------------joint
7. Hinge joint allows only ------------------- movement.
8. The joint between the upper jaw and the rest of the head is an example for -----------.
9. Rib cage is joined to ------------
10. ------------ enclose the portion of your body below the stomach.
11. -------------is made up of many bones joined together
12. --------------- encloses and protects a very important part of the body, the brain.
13. ------------is an example for a cartilage.
14. When contracted, the -------------  becomes shorter, stiffer and thicker
15. The body of an earthworm is made up of many --------- joined end to end
16. An earthworm does not have -----------.
17. ------------- is the outer skeleton of the snail.
18. In birds, -------------------- are modified to hold muscles of flight which are used to move the wings up and down
19. The fishes have ------------------- body
20. ---------------- is the author of the book Gait of Animals.

Answers

1. joints
2. joints
3. Ball and socket joint
4. pivotal joint
5. cylindrical 
6. Hinge
7. back and forth
8. fixed joint.
9. Backbone
10. Pelvic bones
11. skull
12. skull
13. The upper part of the ear 
14. muscle
15. rings
16. bones
17. Shell
18. the breastbones
19. streamlined.
20. Ancient Greek philosopher Aristotle