Abida kept the beaker near the wick in the yellow part of the candle flame. This is calleda ball and socket joint. Non-contact forces — Magnetic force, electrostatic force and gravitational force. Answer The calorific value of fuel is the amount of heat produced by the complete combustion of 1 kg of fuel. It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Go back to main page or move to of page.
Question 9 It is difficult to burn a heap of green leaves but dry leaves catch fire easily. They are familiar with the burning of a candle. It does not leave behind any undesirable substances. This box is called rib cage. Answer: Goldsmith uses the outermost zone of the flame for melting gold and silver because it is the hottest zone complete combustion of the flame. Answer a The movement and locomotion of all animals is exactly the same. Download links are at the end of online solutions of each chapter.
Question 11 In an experiment 4. Now, Heat produced by 4. Question 12: Can the process of rusting be called combustion? Rusting can take place at room temperature but combustion need an ignition temperature. Answer: There are two pairs of wings attached to the breast which helps them in flying. Answer: i We can know the shape of the skeleton by feeling. In the attack, 10 men are killed, 5 women are gravely hurt, many homes are destroyed and over 50 people injured. Answer 5 a Water is not used to control fires involving electrical equipment because it may conduct electricity and harm those trying to douse the fire.
She covers 180 m in one minute by swimming from one end to the other and back along the same straight path. Roles Functions Police Public prosecutor Defence Lawyer Judge hear the witnesses record the statements of witnesses cross examine the witnesses take photographs of burnt homes record the evidence arrest the Fiesta fans writes the judgment argue the case for the victims decide for how many years the accused will be put in jail examine the witnesses in court pass the judgment get the assaulted women medically examined conduct a fair trial Meet the accused persons Now take the same situation but ask one student who is a supporter of the Fiesta Club to perform all the functions listed above. . Question 2 Indicate true T and false F among the following sentences. Apart from the above topics, students will be encouraged to perform some experiments at home by which they will get to know that air is necessary for combustion. What is the difference between the burning of a candle and the burning of a fuel like coal? These solutions for Understanding Our Criminal Justice System are extremely popular among class 8 students for Social science Understanding Our Criminal Justice System Solutions come handy for quickly completing your homework and preparing for exams. Register for our free webinar class with best Science tutor in India.
The paper by itself catches fire easily because of its low ignition temperature. Petroleum was formed when the organism, living in the sea, died and settled at the bottom of the sea. This is because the outermost zone of the flame undergoes complete combustion and is the hottest part of the flame. These harmful pollutants enter the air and cause respiratory diseases like asthma etc. When one body rolls over the surface of another body, the resistance to its motion is called the rolling friction. Having a proper knowledge about combustion is necessary to avoid any emergency caused by fire.
This part of the flame is used because the outermost flame undergoes complete combustion and is considered as the hottest part of the flame. Find a the speed of the train b the time it will take to cross a bridge 500m long. False d The fore arm has two bones. Visit to of the page. Candle burns with a flame whereas coal does not.
Answer: The joint in thebackbone. If the forces acting in opposite direction, the net force acting on the object is difference between the two forces. Solution: A candle is defined as an ignitable wick embedded in wax. Abida kept the beaker near the wick in the yellow part of the candle flame. First divide the class into the following four groups of persons: 1. Ball and socket joints allow movements in all the directions, e. Question 13: Abida and Ramesh were doing an experiment in which water was to be heated in a beaker.
Visit to of the page. We have created most accurate Class 8 Social Science Geography, Civics, and History for your reference. However, dry leaves have no moisture in them. Whose water will get heated in a shorter time? Check these solutions given to clear any doubts instantly and have an effective understanding of the basics. Solution: a The rounded end of the one bone fits into the hollow space of other bone. Answer: The framework of bones in our body is called skeleton.
Question 12 Can the process of rusting be called combustion? Answer: i Earthworm ii Snail 25 Give an example of ananimal, which can walk, climb and fly in the air. It consists of a bone that has a round head, which fits into a cup like depression of another bone. Types of combustion — rapid combustion and spontaneous combustion. These causes pollution and respiratory problems. Answer: Combustion of fuels like petroleum causes formation of un-burnt carbon particles along with carbon monoxide gas.
The streamlined shape helps the fish to move in water. The heat produced was measured to be 180,000 kJ. It needs a lot of space to store also very difficult to transport. If it is used for controlling a fire involving electrical equipments, then the person dousing the fire might get an electric shock. Question 5: What is locomotion? Make a labelled diagram of a candle flame.