CLASS- VII; CHAPTER-10 (SOIL)
1. How does temperature act as an agent of physical weathering? 2. What are the major components of soil? 3. How does air act as the agents of weathering? 4. Plants and animals being the living organisms act as the agent of physical weathering. How? 5. Discuss the various horizons of soil profile. 6. On the basis of soil texture, soil is divided in to how many categories? 7. Define the terms : i. Eluviations ii. Soil density iii. Plasticity iv. cohesion 8. Why are the earthworms known as nature’s ploughmen? 9. What is vermi-composting and how is it formed? 10. Compare the various properties of loamy soil, sandy soil & clayey soil. 11. Why does sandy soil need frequent irrigation? 12. What is soil profile? 13. How does water helps in weathering of rocks? 14. How is humus important for plants? 15. Why does soil of different areas differ in colour? 16. Which soil is considered best for the growth of plants? Why? 17. What are the different factors that affect the soil? 18. Differentiate between top soil and sub soil? 19. What are the different reasons for soil erosion? 20. We can make mud balls with clayey soil but not with sand. Why? LESSON - 8 (TRANSPORTATION IN PLANTS) 1. Explain structure and functioning of heart. 2. What are the various functions of blood? 3. How does skin act as excretory organ in humans? 4. Define the terms: a) Systole b) Diastole 5. What are the excretory organs in human? What are their functions? 6. What are the various organs consisting a circulatory system of an organism? 7. What are two processes responsible for transportation in organisms? 8. What are the conducting tissues of plant and why they are called as vascular tissues? 9. Make a diagram showing transpiration in plants. 10. Why is the outer wall of red blood cell flexible ? L-9 (REPRODUCTION IN PLANTS) 1. Define the terms: a. Reproduction b. Pollination c. Fertilization d. Vegetative reproduction 2. What is asexual reproduction? What are its various methods? 3. What are pollinators? Give examples. 4. Explain vegetative reproduction through leaves with example. 5. What are the characters of pollen grains? 6. What are the harmful effects of vegetative propagation? 7. How are the seeds dispersed by wind? 8. Why is apple termed as false fruit? 9. Explain the process of dispersal of fruits by explosion. 10. What is the difference between unisexual and bisexual flowers? 11. What do you understand by corms in plants? Give examples of such plants in which corms are found. 12. What is the special feature of the following seed which is helpful in their dispersal: a. Seeds of drumstick b. Seeds of Madar c. Seeds of Xanthium and Urena CLASS-VII ; LESSON - 5 (HEAT) 1. Explain why a stone feels very cold to bare feet in winters but a carpet in the same room feels warmer? 2. Why is digital thermometer preferred over mercury thermometer now a days? 3. Why is the box of solar cookers painted black from inside? 4. A metal ball just passes through a metal ring at room temperature. On heating the same metal ball does not passes through the ring. Explain why? 5. Why are ice boxes made as double walled? 6. What is radiant energy? What happens to it when it falls on any matter? 7. Why do houses have light colors on outer walls? 8. Why do firemen use shining brass caps? 9. Why do buildings have coated shining glass as their outer walls? 10. What is meant by land breeze? 11. When does the flow of heat from a hot object to a cold object stops? 12. Why is it better to wear dark clothes in winter? 13. What do you understand by normal human body temperature? 14. We want to keep cold water cold for long time in a container. State whether the container should be painted white or black from outside. Give reason. 15. Define the different methods of transfer of heat. 16. Why does the heat of the sun not reach us by conduction or by convection? 17. Name the two scales on which the temperature is measured. 18. Why do water pipes sometimes burst at very cold places? 19. Does the heat cause any chemical change? Give example. 20. What is the role of bricks and mud in keeping our houses cool?
52 Comments
SECTION-A 1. The circumference of two circles are in the ratio 2: 3 then the ratio of the areas is:
(a) 2 : 4 (b) 2 : 9 (c) 4 : 9 (d) 4 : 6 2. A silver rod of diameter 2 cm and length 12 cm is drawn into a thin wire of length 24 m of uniform thickness, and then the thickness of the wire is: (a) 0. 183 (b) 0.173 (c) 0.186 (d) 0.175 3. In two concentric circles, the length of tangent to inner circle is 8cm. Find the radius of outer circle, if the radius of inner circle is 3 cm. (a) 5 cm (b) 4 cm (c) 3 cm (d) 2 cm 4. A point P is 13 cm from the centre of a circle. Find the length of the tangent drawn to the circle from the point P, if the radius of the circle is 5 cm. (a) 12 cm (b) 10 cm (c) 8cm (d) 6 cm 5. If PA and PB are tangents from a point playing outside the circle such that PA = 10cm and angle APB, then the length of chord AB is: (a) 5 cm (b) 4 cm (c) 3 cm (d) 2 cm 6. If 17th term of an A.P. exceeds its 9th term by 64, then the difference is: (a) 8 (b) 6 (c) 4 (d) 12 7. One coin is tossed three times. The probability of getting 2 heads and 1 heads and 1 tail is: (a) 1/8 (b) 2/5 (c) 3/8 (d) ¼ 8. A vertical stick 20 m long casts a shadow 16 m long. At the same time a tower casts a shadow 48 m long. Then the height of the tower is: (a)40 m (b) 32 m (c) 96 m (d) 60 m 9. A cone is divided into two parts by drawing a plane through mid – point of its axis, parallel to its base. The ratio of volumes of two parts is: (a) 2: 3 (b) 1: 2 (c) 1: 3 (d) 1: 7 10. From a point Q , the length of the tangent to a circle is 24cm and the distance of Q from the centre is 25cm. The radius of the circle is: (a) 7 cm (b) 12 cm (c) 15 cm (d) 24.5 cm See SECTION – B Link for more downloadable CBSE BOARD SAMPLE PAPER SA-2-2012 10th SA-2 Maths sample papers -2011-2012 10th maths question bank with marking scheme for all chapter 10th SA-2 Science sample papers -2011-2012 The Human Eye and Colorful World FA - III (PAPER Pen Test)
Section A Multiple choice questions: - 1. When we enter a cinema hall, we cannot see properly for a short time. This is because-a) Pupil does not open b) Pupil does not close c) Adjustment of size of pupil takes some time d) None of these above Ans: (c) 2. The property of persistence of vision is used in- a) Short sightedness b) Long sightedness c) Cinematography d) Colour vision Ans: (c)3. Variable focal length of eye is responsible for- a) Accommodation of eye b) Persistence of vision c) Colour blindness d) Least distance of distinct vision Ans: (a)4. A concave lens of suitable focal length is used for correcting a- a) Myopic eye b) Hypermetropic eye c) Both a and b d) nor a nor b Ans: (a)5. Splitting of white light into seven colours on passing through the glass prism is called-a) Reflection b) Refraction c) Scattering d) Dispersion Ans: (d) Section B 1. A person with a myopia eye cannot see objects beyond a distance of 1.5m. What would be the power of corrective lens? Which type of lens is used? (2) 2. What do you understand by myopia? Write two causes of it? (2) 3. What do you mean by far point and near point of eye? (2) 4. What is presbyopia? State the causes of it and How is it corrected? (3) 5. Explain: (3) 1) Why does sky look blue on a clear day 2) Twinkling of stars. 6. What is Hypermetropia? State two causes of Hypermetropia with help of ray diagrams show i) The eye defect hypermetropia. ii) Correction of Hypermetropic by using a lens. :(5 mks) Read and download 10th Human eyes and Colorful World (Sure shot For CBSE Board Examination) 10th Human eyes and Colorful World (Sure shot Test paper and Sample paperFor CBSE Board Examination) How do you characterize sound? Intensity or Loudness
The amplitude of a wave depends on the amount of energy that it carries. A high amplitude wave carries a large amount of energy where as low amplitude wave carries a small amount of energy. The average amount of energy passing through a unit area per unit of time in a specified direction is called the intensity of the wave.When the amplitude of the sound wave increases, the intensity of the sound also increases. Sounds with higher intensities are become louder. Relative sound intensities are often given in units named decibels (dB). The Bel is the primary unit and a decibel is 1/10th of a Bel. The Bel is a ratio of the pressure of a sound to a reference pressure. The reference pressure in air is 20 microPascals (µPa). The reference pressure in water is 1 microPascal (1 µPa). Intensity: The average amount of sound power (sound energy per unit time) that transmitted through a unit area in a particular direction. The unit of intensity is watts per square meter. Full Post Read full post : 9th Sound and its Reflections IX Physics Ch. Sound Intensity and Loudness IX Physics Ch. Sound as a wave IX-VIII-Physics Refraction of Sound Explanation How does the sound produced by a vibrating object in a medium reach your ear? (Page 162 )
When an object vibrates, it vibrates the neighbouring particles of the medium. These vibrating particles then vibrate to the adjacent particles In this way, vibrations produced by an object are transferred from one particle to another till it reaches to our ear. Page 163 Explain how sound is produced by your school bell. Ans: When the bell moves backwards, it creates a region of low pressure know as rarefaction. As the bell continues to move forward and backward, it creates a series of compressions and rarefactions. This produce the sound of a bell Why sound waves are called mechanical waves? Ans: Sound waves need the material medium to vibrate and propagate. Hence, these waves are known as mechanical waves. Sound waves propagate through a medium because of the interaction of the particles present in that medium. Suppose you and your friend are on the moon. Will you be able to hear any sound produced by your friend? Sound needs a medium to propagate. Since there is no material medium on the moon due to absence of atmosphere, you cannot hear any sound on the moon. Page 166 Which wave property determines (a) loudness, (b) pitch? (a) Amplitude of sound wave determines the loudness of a sound. The amplitude of a sound directly proportional to amplitude of wave. If the amplitude of a sound is large, then the sound produced will also be loud. (b) Frequency of sound wave determines the pitch of a sound. The pitch of a sound is proportional to its frequency. High pitched sounds have high frequency Guess which sound has a higher pitch: guitar or car horn? The frequency of the vibration of a sound produced by a guitar is greater than that produced by a car horn. As we know that the pitch of a sound is directly proportional to its frequency, the guitar has a higher pitch than a car horn. Read full solution and test paper 9th_science_ncert_solution_chap.-sound Download File IX-Physics for term-II Sound CBSE Test paper Download File More use full link for physics study Physics class 9th Numerical for chapter sound CBSE TEST PAPER (Class-9)Work and Energy Numerical on work and energy for class 9 9th Question Bank chapter -Sound 9th Physics for term-II Sound NCERT Solutions |
Blog SeaRCH Link
All
Join Us For Update |