Grade 8

  SOUND Fill in the blanks : 1. Time taken by an object to complete one oscillation is called _______________. 2. Loudness is determined by the _______________________of vibration. 3. The unit of frequency is ________________________. 4. Unwanted sound is called ______________________. 5. Shrillness of a sound is determined by the __________________________. 6. The number of oscillation in one second is called ____________________. 7. The hearing range of human ear is _____________ 8. Sound cannot travel in __________________. 9. Sound can travel in _____________________. 10. The pitch of sound depends on __________________. Choose the correct answer : 1. Ear drum is a part of ____________________ [ sound producing organ or hearing organ] 2. The voice box is also called _________________ [ Larynx / mouth] 3. Large amplitude of sound vibrations will produce __________________________ [ Loud sound / slow sound] 4. Voice of which of following is likely to have minimum frequency ______...

  COAL AND PETROLEUM Name the following 1. Inexhaustible natural resources. 2. Exhaustible natural resources [ Any three] 3. Remains of dead animals and plants 4. Oldest variety of coal 5. Fossil fuels 6. A foul smelling liquid mined from earth. 7. A combustibe gas which comes out along with petroleum from the oil wells. 8. A combustible gas obtained by the destructive distillation of coal. 9. A fuel for heavy vehicles. 10. The useful products obtained from the petroleum 11. Different varieties of coal. 12. Residue left after the destructive distillation of coal tar. 13. The process in which complex organic substances are heated in the absence of air to get simple volatile fractions. 14. Chemical used as moth repellent. 15. The process which is used for the manufacture of petrol from petroleum gas. 16. Alternative sources of energy (any three) Association which offers the tips to conserve petrol & diesel. Multiple Choice questions 1. The variety of coal which has highest conten...

  Light  Give one word for the following : 1. The invisible energy which causes in use the sensation of vision. 2. The ray of light which travels towards a mirror. 3. A line which is drawn at right angles to the mirror surface at the point of incidence. 4. Name one type of mirror which always form virtual image. 5. What type of image is formed on the cinema screen ? 6. Which cells on the retina respond to the intensity of light. 7. The part of the eye which preserves its shape and protects it from external injuries. 8. The phenomenon due to which we can judge depth. 9. The most sensitive part of the retina. Fill in the blanks : 1. The point at which the incident ray falls on the mirror is called ___________________ 2. If a ray of light is incident on a plane mirror at an angle of 300, its angle of reflection is _______________. 3. If a ray of light is incident normally on a mirror, i = __________ and r = ________________ 4. The image of our face in a plane mirror is an examp...

  REACHING THE AGE OF ADOLESCENCE F ill in the blanks : 1.The period of life, when the body undergoes changes, leading to reproductive maturity is called _____________________. 2.The age at which reproductive organs become functionally active is called ____________________________. 3.Increase in height occurs during _______________________. 4.____________________ are external characters which are directly not involved in the process of reproduction. 5.The changes which occur during adolescence are controlled by ________________________________. 6.The hormones are produced in special organ are called __________________________________. 7.Endocrine glands are also called _______________________ glands. 8.In frog metamorphosis is controlled by _____________________ hormone. Answer the following : 1. Name the sex hormone in humans. 2. Name the disease caused due to deficiency of the hormone thyroxine. 3. Name the hormone produced by the adrenal gland. 4. Name the master gland. 5. Wha...

 

  Revision Sheet Q.1 The number of times the loop will execute is determined by a __________________ or a _______________. Q.2 Each item in a list can be referred to using an __________. Q.3 When you try to access an element with an index other than the available range, it will raise an _____________. Q.4 The index has to be an integer. You cannot use a float or other data types for specifying an index, this will raise a _____________.     Q.1Explain List functionality with suitable example. Q.2 What is loop. Explain that types. Q.3 What is counter-controlled loop? Explain with suitable Q.4 What is range() function when we are used. Q.5 Can we used else statement with for loop? If yes then explain with suitable example. Q.6 What is counter-controlled loop? Explain with suitable Q.7 what will be happen if while loop condition was not break? Q.8 What is the use of break() statement? Given suitable example. Q.9 Difference between Break() and co...

 

    SST Extra Questions   1.       Mention any one guidelines the police must follow for the detention of any person. ·          The police officials should wear clear, accurate, and visible identification as well as name tags with their designations while carrying out the arrest or interrogation. ·          The person who is arrested, detained or being interrogated has a right to inform a relative, well-wisher or friend. ·          The police must notify the time, place of arrest and venue of custody within 8 to 12 hours after arrest if a relative or friend resides outside the district. 2.       Briefly explain the features of the fair trial The accused is given a copy of chargesheet and all the evidences that the prosecution presents against the accused. The trial is held in public vie...

 

 

  SECTION A: READING Read the following passage given below. 1. People travelling long distance frequently have to decide whether they would prefer to go by land, sea or air. Hardly anyone can positively enjoy sitting in a train for more than a few hours. Train compartments soon get cramped and stuffy. It is impossible to take your mind off the journey. Reading is only a partial solution for the monotonous rhythm of the wheels clicking on the rails soon lulls you to sleep. During the day, sleep comes in snatches. At night when you really wish to go to sleep, you rarely manage to do so. If you are lucky enough to get a place, you spend half the night staring at the small blue light on the ceiling. Inevitably, you arrive at your destination almost exhausted. 2. Long car journeys are even less pleasant for it is quite impossible even to read. On motor ways, you can at least travel fairly...