Life Science Chapter 4 Test Answers

[DOWNLOAD] Life Science Chapter 4 Test Answers

On adding water this micelles containing dirt are washed away and our clothes are washed clean. List two tests for the experimentally distinguish between an alcohol and carboxylic acid and describe how these tests are performed. Add a small dried...

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Class 9 Science Online Tests

When a flame is brought near it. Test 2: Reaction with sodium hydrogen carbonate: Take 2 ml of saturated liquid solution of sodium hydrogen carbonate in a test tube. Add a little of the unknown sample into it and shake. If evolution of carbon dioxide gas take place, then the sample is carboxylic acid otherwise it is an alcohol. Carbon dioxide when pass through lime water turns milky. Why are they different from ionic compounds? List their three characteristic properties. A covalent bond is formed by sharing of electron between atoms. While a covalent compound contains covalent bond the ionic compound is made up of ionic bond which is formed by the transfer of electrons from one atom to the other.

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Characteristics of covalent compounds: i These compound show low melting and boiling point because the intermolecular forces are weak. When ethanol reacts with ethanoic acid in the presence of conc. H2SO4, a substance with fruity smell is produced. Answer the following: i State the class of compound to which the fruity smelling compounds belong. Write the chemical reaction for the equation and the chemical name of the product. H2SO4 acts as a dehydrating agent and removing the water formed in the reaction. What is homologous series of carbon compound? List its any two characteristics. Characteristics: 1. Melting and boiling points increase regularly with increase in molecular mass.

CBSE Class 9 Science Important MCQs from Chapter 5 The Fundamental Unit of Life

Solubility in a particular solvent shows a regular gradation. Chemical properties remain the same in homologous series. Its name is ethanoic acid or acetic acid. Why do carbon form largest numbers of compounds? Give two reasons. Because of tetra-valency carbon atom in its compound are linked by single, double or triple bonds. Carbon atom are also bonded with oxygen, hydrogen, chlorine, nitrogen and sulphur giving rise to compounds with specific properties typical of the element other than carbon present in the molecule.

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The bonds so formed are single covalent bonds. These hydrocarbons are also called alkanes. Give one example. Write two example each. Saturated hydrocarbon- methane CH4 , ethane C2H6. Unsaturated hydrocarbon- ethene C2H4 , ehyne C2H2. Define homologous series of carbon compounds. List any two characteristic of a homologous series. Characteristics of homologous series are: i It has a general formula in term of number of carbon atoms. Both soap and detergent are some type of salts. What is the difference between them? Describe in brief the cleansing action of soap. Why do soaps not form lather in hard water? List two problems that arise due to the use of detergents instead of soaps. Soaps molecules has two parts. The ionic end of soap dissolves in water while the carbon chain dissolves in oil. Most dirt is oily in nature. Soap molecules form a micelle around dirt oil whose outer parts are directed towards water.

NCERT Solutions for Class 9 Science Chapter 4

On adding excess water, the dirt along with the soap molecules is washed away. This is how the cleansing action of soaps is described. Hard water contains chlorides and sulphates of calcium and magnesium which react with soap to form insoluble scum. Therefore, soap is not able to perform its cleansing action. Detergents are not biodegradable substances. Thus, they may cause water pollution. Detergents are highly basic in nature. They may affect the skin. Following questions contains five marks each. Answers are given point wise. This is because unsaturated hydrocarbon contains double or triple bonds. Such compounds are unstable because the four valences of carbon atom are not satisfied by linking to four atoms. They complete the four valences in addition reaction.

Life Science Tests (4th ed.)

Hence, it is an oxidation reaction. To prevent its use for human consumption, it is made unfit for drinking by adding a poisonous substance like copper sulphate. Explain why carbon forms compounds mainly by covalent bond. Explain in brief two main reasons for carbon forming a large number of compounds. Why does carbon form strong bonds with most other elements? Similarly, it has no tendency to gain electrons.

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It completes its octet buy sharing the electrons other atoms. Therefore, carbon forms compounds mainly by covalent bonds. Two main resources for carbon forming a large number of compounds are given below: Catenation: It is the property of carbon to link with other carbon atoms to form straight chain, branched chain or cyclic compounds. Thus, carbon forms a large number of compounds containing 2, 3, 4, 5…. Tetravalency; Carbon has four electrons in the outermost shell. It shares these four electrons with four electrons from four other monovalent atoms. Carbon has the tendency to form bonds with hydrogen, oxygen, nitrogen and halogens. This increases the number of compounds of carbon.

NCERT Solutions for Class 10 Science Chapter 4 - Carbon and Its Compounds

Carbon forms strong bonds with most other elements: This is because carbon has a small atomic size. It can hold strongly the four pairs of electrons. That it shares with other atoms. Therefore, it forms strong bonds with other elements. Write the balanced chemical equation for the reaction showing the types of energies liberated.

Life Science, 4th ed. Web Links

Chapter 15 - Improvement in Food Resources Summary of Structure of The Atom Class 9 The 4th chapter will deliver a constructed concept of how an atom is subdivided into subatomic particles. It will also tell you how scientists proved the existence of subatomic particles within an atom. The consecutive development of theories will make you understand how an atom stabilizes its charges. It is a fascinating chapter to learn and prepare a foundation to rely on. You will need these new concepts to study more advanced chapters in the future.

Life Science Chapter 4

Study the chapter well and focus on what the units are telling us to follow. Develop your concepts accordingly and find out new scientific facts about an atom and its subatomic particles. Proceed with proper attention. Once you finish a unit, solve the exercise, and judge your understanding of the concepts. Here is what you need to do to study the new concepts of Class 9 Science Chapter 4. Read the Chapter Thoroughly The first step is to read the units of Ch 4 Science Class 9 properly and understand the new concepts. You must only proceed to the next unit when you are done with the previous one.

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Answers the Exercise Questions The next step is to find the questions in the unit exercise. Answer the questions on your own first. The answers are based on the CBSE format. They are precise and easy to understand. Just follow it and impress the examiner to score better. You can use it offline to study the different conceptual answers framed for the respective exercises. Vedantu experts have formed these answers for your convenience. You can save your precious time and concentrate on learning this chapter properly.

NCERT Solutions for Class 9 Science - Download in Chapter-Wise PDF

The force acting per unit area of the object is known as pressure. Density or Mass density is the ratio of mass per unit volume. Q3: The weight of a man is N which contains 5. Find a blood's weight. Pressure in Liquids Fluids gases and liquids exert pressure due to their weight. The greater the height of a fluid above a surface, the greater the pressure exerted by the fluid on that surface. Pressure Increases with the depth.

Class 10 Science Chapter 4 Board Questions

At any point inside a fluid, the pressure is exerted in all directions. The pressure on each side is perpendicular to the surface, no matter what its shape. Now the pressure at the bottom will be a. Answer: Correct answer is b. For the given situation, h and g are fixed. So fluid with less density will apply less pressure. Q5: What do you mean by Thrust or Buoyant force? Answer: The upward force exerted by a liquid when a body is immersed in the liquid is called thrust or Buoyant Force.

8th Gr Sci Ch 4 Test

Note: When in equilibrium the buoyant force is balanced by the weight of an object or the force of gravity acting on it. Q6: What are the factors the buoyant force depends on? Answer: 1. The volume of the object immersed in the liquid. The density of the liquid. Note: Buoyant force does not change with depth. Answer: If the density of an object is higher than the density of the liquid, then it sinks in the liquid. This is because the buoyant force acting on the object is less than the force of gravity. In case, if the density of the object is less than the density of the liquid, then it floats on the surface of the liquid. This is because the buoyant force acting on the object is greater than the force of gravity. Q8: The following figure shows four containers containing a liquid at the same height. Rank them according to the pressure exerted by the liquid on the bottom of the containers in ascending order. Answer: d Q9: What are Plimsoll Lines? Plimsoll Lines Answer: While loading a ship, care is taken it should not be loaded too much.

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Its load depends on the density of the sea in which it floats. The ship would sink if its load exceeds. To indicate the depth up to which the ship can sink in a sea of different densities under different climatic conditions, several lines are marked on the sides of the ship. It ensures stability and safety of the ship and these lines are called Plimsoll lines name after sailor Captain Plimsoll For details, check the wiki. Q Define 1 Pascal. Answer: When a force of 1 newton acts normally on an area of cross-section 1 m2, then the pressure experienced by the surface is said to one pascal. Based on this principle, write its two applications. Answer: When a body is partially or wholly immersed in a fluid, it experiences an upthrust and apparently loses its weight which is equal to the weight of the fluid displaced by the immersed part of the body. What is its specific gravity? Will the bar float or sink in water? Answer: Relative density is also called as specific gravity. It is the ratio of the density of a substance to the density of water i.

Life Sciences Grade 10 Table of Contents | Siyavula

Answer: A sheet of paper will fall slower than the one which is crumpled into a ball because air offers resistance to the falling objects. The paper in sheet form has a larger surface area than that of a crumpled paper ball. Thus the sheet will experience more pressure air resistance and falls slower. Answer: The buoyant force on an object immersed in a liquid always acts vertically upwards.

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Answer: The upward buoyant force acting on the block is greater than the downward gravitational force due to its weight. Due to this the block of plastic released underwater comes up to the surface of the water. If the density of water is 1 g cm-3, will the substance float or sink? Will the packet float or sink in water if the density of water is 1 g cm-3?

Class 7 Science Chapter 4 MCQ

What will be the mass of the water displaced by this packet? Since the contact surface area of a thin string, a strap is very small, it exerts larger pressure on the shoulder. Is your mass more or less than 42 kg? Answer: The actual mass shall be more than 42kg. When we weigh, we experience an upward thrust buoyant force due to air. Thus weighing machine shows our apparent weight. In which direction, outward or inward, does your eardrum move when you climb up? Answer: Outward. Since the internal pressure of the body is higher than atmospheric pressure. Q Is the Archimedes principle applicable to gases? Answer: Yes. Q Why do sewing needles and all pins have a sharp pointed tip?

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When we pin up the papers or sew the clothes, we apply force over a very small area which leads to a larger pressure. That's why sewing needles and all pins have pointed tips. Now some water is mixed with the milk. Will the test tube sink more or less? Answer: Density of milk is higher than the density of water. When some water is mixed with milk, then the mixture will have less density than pure milk. It will exert less amount of buoyant force. Consequently, the test tube will sink more. When completely filled with water, the glass weighs 4 N. If you now throw the water away and fill the glass partly with sand, the weight becomes 4 N.

NCERT Solutions for Class 9 Science | Download in PDF

If the rest of the glass is now filled up with water, the weight becomes 6 N. What is the relative density of sand? In reality, one is heavier than other. Can you say which one is heavier and why? Answer: The iron bar is heavier than the bag of cotton. This is because the surface area of the cotton bag is larger than the iron bar. Hence, a more buoyant force acts on the bag than that on an iron bar. This makes the cotton bag lighter than its actual value. For this reason, the iron bar and the bag of cotton show the same mass on the weighing machine, in actual the mass of the cotton bag is more than that of the iron bar.

Life Science Tests Answer Key (4th ed.) | BJU Press

Students at class eighth shouldn't be entirely dependent upon the concepts taught in the class. They need to figure out a smart way of studying. NCERT Solutions for Class 8 not only provide solutions to all the questions but also promises an easier way of explaining. When coming back home a student needs a solid help to understand and follow up on the concepts. NCERT contains the same way of explaining as done by the teacher. What you need is a different and easier way of understanding. We not only need a smart routine but a smart solution as well. NCERT might be tough at times and school might be boring. You are supposed to grow mentally and physically at a great pace now. In this era of smartness, are the ways of our studies smart enough?

MCQ Questions for Class 9 Science with Answers

None of the above. Answer: Option B Explanation: We will prefer white fabric tent in case of summer because it reflects all the radiations from the sun and keeps us cool inside the tent. Start a New Test Thermos flask Thermos flask is a special type of vessel which keeps hot liquids hot and cold liquids cold. It is made in such a way as to reduce the loss of heat by conduction, convection and radiation to minimum. It is a double walled glass vessel. The space between the two walls has no air in it. It is a vacuum indeed. The inside of the outer wall and outside of the inner wall are brightly polished with silver. The whole system is enclosed in a metal case. It is supported on corks or rubber pieces on all sides. The mouth too is closed with a cork. How it Works The vacuum between the walls prevents the flow of heat of conduction and convection.

Chapter - 4 Materials: Metals and Non – Metals MCQ Test 2 Science | Class 8th - StudyRankers Test

As for radiation, the brightly polished outer surface of the inner wall is a slow radiator of heat. The little heat that radiates is reflected back by the inner brighter surface of the outer wall. So, the hot liquid remains hot for a long time in the flask. What is thermometer? The device which measures the degree of hotness is called thermometer. Which type of surfaces are good absorbers of heat? Black and rough surfaces are good absorbers of heat. Which type of surfaces are poor absorbers of heat?

Chapter – 4 Materials: Metals and Non – Metals MCQ Test 2 Science | Class 8th

White and smooth surfaces are poor absorbers of heat. Which scale is used for measuring heat in scientific work? Temperature is generally measured in Celsius or Fahrenheit scale. Kelvin scale is used for scientific work.

MCQ Questions for Class 8 Science Chapter 4

Odisha Board Class 10 Life Science Chapter - 4 Textbook sets the foundation for the topics to be taught in class for the academic year. If the students are thorough with the topics of the Books, they will find it easier to prepare for the board exams. Here, for the convenience of all the students we have given the link to download the current textbook of the subject wise. Students can refer to this textbook to get an idea about the concepts and topics being discussed in school under each subject, for the academic year. The BSE Odisha board is also responsible for preparing the courses of studies, text books, and study material for the students. Class 9th is a crucial stage for students. The marks obtained in class 9th will decide what stream students will opt for in class So, to help students in their studies we have gathered all the study resources. For this we have provided some study material for the students. It will help them plan their studies effectively.

Chapter 5: The Fundamental Unit of Life

Why should we avoid keeping the thermometer in the sun or near a flame? It measures flame temperature [B]. Sun temperature can be measured [C]. Automatically it may break [D]. Vapour can create under thermometer Answer: Option C Explanation: We know that Mercury is liquid at room temperature and expand with heat. Expansion may apply pressure to break it. Start a New Test Thermos flask Thermos flask is a special type of vessel which keeps hot liquids hot and cold liquids cold. It is made in such a way as to reduce the loss of heat by conduction, convection and radiation to minimum.

Chapter – 6 Natural Vegetation and Wild Life MCQ Test – 1 | Geography Class – 7th

It is a double walled glass vessel. The space between the two walls has no air in it. It is a vacuum indeed. The inside of the outer wall and outside of the inner wall are brightly polished with silver. The whole system is enclosed in a metal case. It is supported on corks or rubber pieces on all sides. The mouth too is closed with a cork. How it Works The vacuum between the walls prevents the flow of heat of conduction and convection. As for radiation, the brightly polished outer surface of the inner wall is a slow radiator of heat. The little heat that radiates is reflected back by the inner brighter surface of the outer wall. So, the hot liquid remains hot for a long time in the flask. What is thermometer? The device which measures the degree of hotness is called thermometer. Which type of surfaces are good absorbers of heat? Black and rough surfaces are good absorbers of heat.

MCQ Questions for Class 8 Science Chapter 4 Materials: Metals and Non-Metals with Answers

Which type of surfaces are poor absorbers of heat? White and smooth surfaces are poor absorbers of heat. Which scale is used for measuring heat in scientific work? Temperature is generally measured in Celsius or Fahrenheit scale. Kelvin scale is used for scientific work.

Bse Odisha 9th Class Life Science Chapter 4 Book

All these questions will help you revise the important topics and concepts for the objective type questions which will appear in Class 9 Science paper under the CBSE Annual Exam. A cell will swell up if a The concentration of water molecules in the cell is higher than the concentration of water molecules in the surrounding medium. Answer: b The concentration of water molecules in the surrounding medium is higher than the concentration of water molecules in the cell. Which of the following statement marks as a difference between plant cell and animal cell? Answer: a Plant cells have cell wall which animal cells do not. Endoplasmic reticulum one of the cell organelles, exists as a membranous network that extends from outer membrane of nucleus to the plasma membrane making a connection between them.

Chapter 2 Environmental Science Study Guide

Which of the following statements is not related to the endoplasmic reticulum? Answer: c It can be the site of energy generation. Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one. Can you pick out the option among the following which does not belong to this process? Answer: d Plasma membranes contain chitin sugar in plants. The nucleus controls all the activities of the cell and acts as a site of DNA material and protein synthesis. It is composed of some components which all together give the nucleus its functionality.

NCERT Solutions for Class 10 Science Chapter 4 Carbon And Its Compounds - Free Download

Here is shown a figure of nucleus with some of its components labeled as A, B, C and D. You must have observed that a fruit when unripe is green but it becomes beautifully coloured when ripe. According to you what is the reason behind this colour change. For this she cut the vegetables into small pieces and put them in the sun for few hours. Rahul was observing all her activities very curiously and asked his mother if why she had put the salted vegetables in the sun. Answer: c So that the vegetables may lose all the water by diffusion and evaporation and become dry. The process of plasmolysis in plant cell is defined as: a Breakdown of plasma membrane in hypotonic solution.

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