Science. 3 Sohan loves to eat pizza, chips, burgers, etc. Doctor has advised him to stop eating junk food. Give one reason for his suggestion.

Transcription

1 Science Date: Class: VI Time: hrs M. M: 90 General Instructions:. There are 6 questions in this paper.. Marks are indicated against each question.. Q4 to Q6 are based on practical skills. 4. All questions are compulsory. From which part of the plant jute is obtained? Also name the type of soil suitable for growing jute. Give the SI unit of the following: (a) Temperature (b) Mass Sohan loves to eat pizza, chips, burgers, etc. Doctor has advised him to stop eating junk food. Give one reason for his suggestion. 4 Why is it better to use compost instead of chemical fertilizers? While travelling in a train, it appears that the trees are moving whereas co passengers appear to be stationary. Explain the reason. 6 Why does an earthworm find it difficult to move on a glass surface? 7 (a) What are the advantages of classification of objects? (Any two ) (b) Give one difference between object and material. 8 The pie chart shown in figure below are based on waste segregation method adopted by two families X and Y respectively. Which of the two families X or Y do you think is more environmentally conscious and why? VI A Page of 4

2 9 Identify the following methods of separation shown in fig. A, B and C. Also write the principle behind these methods. A B C 0 (a) Distinguish between saturated solution and unsaturated solution. (b) Why does visibility increase after rain? (c) Name two gases that are soluble in water. Identify the type of motion exhibited in each case: (a) A ball falling freely from the roof of a building. (b) A shot put thrown by an athlete. (c) Motion of the minute hand of a clock. (d) A spinning wheel (e) Pendulum of a clock. (f) Giant wheel. (a)define shadow. (b)why is the shadow of an aeroplane flying high in the sky not seen on the ground? (c)three identical towels of red, blue and green colour are hanging on a clothes line in the sun. What would be the colour of the shadow of these towels? Give reason for your answer. Explain any three precautions to be taken while taking measurement using a scale. 4 (a)write about any two ancient units of measurement. (b) Why were those ancient units replaced by standard units of measurement? Look at the flowchart given below and answer the questions that follow: Wheat Rat Snake Eagle (a)what does this flowchart depict? (b)the farmer uses pesticides in the field. How is that useful to the farmer? (c)what will happen if all the snakes in the field are removed? 6 With the help of an activity, show that starch is present in rice. 7 Write one word for the following: (a)fibres that attach muscles to the bones (b)joint that allows bones to glide over each other (c)joint that allows movement of the bones in one direction i.e. up and down (d)tissues that join bones to each other. (e)other name of brain box. (f)soft substance that fills bones. 8 A B VI A Page of 4

3 (a)in the above figure, there are two snakes of the same size slithering on sand. Can you identify which of them would move faster and why? (b) Write any two functions of human skeleton. (c)how is the skeleton of a fish well suited for swimming? (Any two) 9 (a)explain any three methods of garbage disposal. (b)give two reasons why plastics are harmful. 0 (a)differentiate between transparent, translucent and opaque materials, giving an example of each. (b)give reasons for the following: (i) Handles of cooking utensils are made up of hard plastic or wood. (ii)plastics float on the surface of water. (a)the photograph given, shows section of a grille made up of straight and curved iron bars. How would you measure the length of the bars of the sections so that the payment could be made to the contractor? Explain. (b)convert the following: (i) 678 km to m (ii) 7.m to cm (iii)9. m to mm. (a)distinguish between image and shadow. (Any three) (b)what happens to the shadow formed on a screen when: (i) The distance between the source of light and the object increases (ii) The distance between the object and the screen decreases. (i)raju was suffering from spongy and bleeding gums. His friend Rani advises him to include a few food items like amla,citrus fruits in his diet as he might be suffering from a deficiency disease. (a)what are deficiency diseases? (b)which deficiency disease he might be suffering from? (c)what values of Rani are shown here? (ii)write any one protein deficiency disease. Also write its two symptoms. 4 (a)given below is the picture of skeleton. Label the parts marked as A, B, C, D, E, F VI A Page of 4

4 (b) How do the muscles attached to bones bring about movement? Which of the following is not always necessary to observe a shadow? (a)sun (b)screen (c)source of light (d)opaque object. 6 Which of the following does not express a time interval? (a)a day (b)a second (c)a school period (d)time of the first bell in the school 7 Which of the following can never form a circular shadow? (a) A ball (b) A flat disc (c) A shoe box (d) An ice cream cone. 8 The correct sequence to get cloth is (a)fiber-fabric-yarn (b)fiber-yarn-fabric (c)fabric-yarn-fiber (d)yarn-fiber-fabric 9 In the mixture of sand and water, sand is.. (a)decant (b)filterate (c)sediment (d) distillate 0 During filtration, the clear liquid obtained is called. (a)sediment (b) decant (c) filterate (d) distillate What is left behind when a snail crawls? (a)shell (c)muscular foot The movable bone in the skull is: (a) the upper jaw (c) face bone (b)trail of mucus (d) tentacle (b)the lower jaw (d) none of these The conditions necessary for sprouting the seeds are: (a) sunlight(warmth),water,air (b) warmth and air (c) sunlight (d) soil and sunlight 4 Two students A and B looked through pipes of different shapes to see a candle flame as shown in figure given below: A B Who will be able to see the candle flame clearly and why? Radhika on a very cold day, took two blankets to keep her warm whereas her brother Raghav took only one thick blanket with the thickness equal to two blankets. Who will get more warmth and why? 6 Rita is confused that water does not provide nutrients, yet it is an important component of food. Justify to avoid her confusion. VI A Page 4 of 4

5 CLASS VI SCIENCE From which part of the plant is jute obtained? Also write the type of soil good for growing jute. Stem(/). Fertile alluvial soil(/) Give the) SI unit of the following: (a) Temperature (b) Mass A) Kelvin(/) B) Kilogram(/) Sohan loves to eat pizza, chips, burgers, etc. doctors has advised him to stop eating junk food. Five one reason for his suggestion As it can make him obese() 4 Do you think it is better to use compost instead of chemical fertilizers? Why? Compost is a natural manure whereas chemical fertilizer contains chemicals which is not good for plants. While travelling in a train, it appears that the trees are moving whereas co passengers appears to be stationary. Explain the reason. As in train they are not moving their position with respect to us() whereas trees positions are getting changed() 6 Why does an earthworm find it difficult to move on a glass surface? For movement,earthworm fixes its front end and releases the rear end.on a glass,it loses its grip. 7 (a) What are the advantages of classification of objects (Any two ) (b) Give one difference between object and material? a))it helps in systematic study of objects.() )It helps in identifying and locating things.() B) object is a thing that can be seen or touched whereas material is used to make objects.() 8 The pie chart shown in figure below are based on waste segregation method adopted by two families X and Y respectively. Which of the two families X or Y do you think is more environmentally conscious and why? X is more environmentally conscious because the kitchen waste and polythene bags are disposed off separately. They separate biodegradable waste and non-biodegradable wastes,which are processed separately. 9 Identify the following methods of separation shown in fig. A, B and C. Also write the principle behind these methods.

6 A B C A-Winnowing(/) Principle-Difference in weight of the components(/) B- Sieving(/) Principle-Difference in size of components(/) C- Hand picking(/) Principle- color,size,should be different and impurities should be lesser(/) 0 (a) Distinguish between saturated solution and unsaturated solution. (b) Why does visibility increase after rain? (c) Name two gases that are soluble in water. (a)saturated solution-solution in which no more solute can be dissolved(/) Unsaturated solution-solution in which more solute can be dissolved(/) (b) As all the impurities suspended in air come down() (c) CO(/) and O(/) Identify the type of motion exhibited in each case: (a) A ball falling freely from the roof of a building. (b) A shot put thrown by an athlete. (c) Motion of a minute hand of a clock. (d) A spinning wheel (e) Pendulum of a clock. (f) Giant wheel. (a) Rectilinear (b) Curvilinear (c) Circular (d) Circular (e) Oscillator (f) Circular(/*6) (a)define shadow. (b)why is the shadow of an aeroplane flying high in the sky not seen on the ground? (c)three identical towels of red, blue and green colour are hanging on a clothes line in the sun. What would be the colour of the shadow of these towels? Give reasons. (a) A dark patch formed behind an opaque object when it blocks the light.() (b) This is because the size of a flying aeroplane is very small with respect to the ground.() (c) Black(/) as it does not show the color of object(/) Explain any three precautions to be taken while taking measurement using a scale. Worn out edge(/),explanation(/) Placement of scale(/),explanation(/) Position of eye(/),explanation(/) 4 (a)write about any two ancient units of measurement. (b) Why were those ancient units replaced by standard units of measurement? (a) Handspam- Distance between thumb and little finger of a fully stretched hand. Footstep- Distance between steps while walking. (b)ancient units cannot be used as standard units of measurement as the length of the body parts varies from person to person. Look at the following food chain given below and answer the question that follows Wheat Rat Snake Eagle (a)the farmer uses pesticides in the field. How is that useful to the farmer? (b)what values of the farmer are shown here? (c)what will happen if all the snakes in the field are removed? (a)it shows the flow chart.() (b)it kills all the pest in the field.() (c)smart,intelligent(/+/) 6 With the help of an activity, show that starch is present in rice. Aim(/) Material required(/) Procedure() Observation(/) Result(/)

7 7 Write one word for the following: (a)fibres that attach muscles to the bones (b)joint that allows bones to glide over each other (c)joint that allows movement of the bones in one direction ie up and down (d)tissues that join bones to each other. (e)other name of brain box. (f)soft substance that fills bones. A) Tendons B) Gliding C) Hinge D) Ligament E) Cranium F) Bone Marrow(/each) 8 (a)in the given figure, there are two snakes of the same size slithering on sand. Can you identify which of them would move faster and why? A (b) Write any two functions of skeleton. (c)how is the skeleton of a fish well suited for swimming? (Any two) A) B(/) will move faster as its long body makes many loops and each loop gives it a forward push.(/) B) ) It gives shape and support to the body.(/) )It helps in the movement of our body parts.(/) C) Streamlined body(/) Fins and tail fin(/) 9 (a)explain any three methods of garbage disposal. (b)give two reasons why plastics are harmful. A)Landfill(/)+Explanation(/) Composting(/)+Explanation(/) Vermi Composting(/)+Explanation(/) B)Non biodegradable() Chokes the drainage system() 0 (a)differentiate between transparent, translucent and opaque materials, giving an example of each. (b)give reasons for the following: (i) Handles of cooking utensils are made up of hard plastic or wood. (ii)plastics float on the surface of water. A) Transparent-Materials which allow light to pass through them(/) Example:glass(/) Translucent-Materials which allow light to pass partially(/) Example: frosted glass(/) Opaque-Materials through which light does not pass(/) Example: wall(/) B) )As plastic is insulator() )As it is lighter in weight() (a)the photograph given below shows section of a grille made up of straight and curved iron bars. How would you measure the length of the bars of the sections so that the payment could be made to the contractor? Explain (b)convert the following: (i) 678 km to m (ii) 7.m to cm A) Using a measuring tape,the curved iron bars would be measured and using a metre scale,straight bars would be used.(). then both are added.() B) )km=000m 678 km=678.*000 m(/) =678000m(/) )7m=00cm 7.m=7.*00cm(/) 7cm(/) B

8 (a)distinguish between image and shadow. (Any three) (b)what happens to the shadow formed on a screen when: (i) The distance between the source of light and the object increases and (ii) The distance between the object and the screen decreases. A))The image is of the same color as the object whereas the shadow is always dark regardless of the color of the object. ) The image gives all the details of the object whereas the shadow shows no details of the object.it tells only the shape of the object. )The image undergoes lateral inversion whereas the shadow does not undergo lateral inversion.() B)) Decreases() ) Decreases() (i)raju was suffering from spongy and bleeding gums. His friend Rani advises him to include a few food items like amla,citrus fruits in his diet as he might be suffering from deficiency disease. (a)what are deficiency diseases? (b)which deficiency disease he might be suffering from? (c)what values of Rani are shown here? (ii)write any one protein deficiency disease. Also write its two symptoms. )a)diseases that are caused due to the lack of carbohydrates,fats,proteins,minerals or vitamins, in our diet,are called deficiency diseases.() B)Scurvy() C)Smart, Intelligent(/)+(/) ) Marasmus(),Symptoms-sunken eyes(/),ribs become very prominent(/) 4 (a)given below is the picture of skeleton. Label the parts marked as A, B, C, D, E, F (b) How do the muscles attached to bones bring about movement?? A) A- collar bone B-Shoulder Girdle C-Chest Bone D- Hip Girdle E-Tibia B) Bones cannot move by themselves.the muscles attached to the bones make them move at the joints.the contraction and relaxation of the muscles attached to the bones make the bones move. Which of the following is not always necessary to observe a shadow? (a)sun (b)screen (c)source of light (d)opaque object. A)Sun() 6 Which of the following does not express a time interval? (a)a day (b)a second (c)a school period (d)time of the first bell in the school D)Time of the first bell in the school() 7 Which of the following can never form a circular shadow? (a) A ball (b) A flat disc (c)a shoe box (d) An ice cream cone. 4

9 (c)a shoe box 8 The correct sequence to get cloth is (a)fiber-fabric-yarn (b)fiber-yarn-fabric (c)fabric-yarn-fiber (d)yarn-fiber-fabric B) Fiber-yarn-fabric() 9 In the mixture of sand and water, sand is.. (a)decant (b)filterate (c)sediment (d) distillate C) sediment() 0 During filtration, the clear liquid obtained is called. (a)sediment (b) decant (c) filterate (d) distillate C)filterate() What is left behind when a snail crawls? (a)shell (b)trail of mucus (c)muscular foot (d) tentacle B) trail of mucus() The only movable bone in the skull is: (a) the upper jaw (b)the lower jaw (c) face bone (d) none of these B) the lower jaw() The conditions necessary for sprouting the seeds are: (a) sunlight(warmth),water,air (b) warmth and air (c) sunlight (d) soil and sunlight A)sunlight(warmth),water,air() 4 Two students A and B looked through pipes of different shapes to see a candle flame as shown in figure given below: A B Who will be able to see the candle flame clearly and why? A)()Light travels in straight line() Radhika on a very cold day, took blankets to keep her warm whereas her brother Raghav took only one thick blanket with the thickness equal to blankets. Who will get more warmth and why? Raghav() as more layer traps air which is insulator.() 6 Rita is confused for water does not provide nutrients, yet it is an important component of food. Justify to avoid her confusion. ) It transports substances and nutrients inside our body. ) It regulates the temperature of our body by sweating.( each)