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NCERT Exemplar Problems Class 8 Science Combustion and Flame

NCERT Exemplar Problems Class 8 Science Chapter 6 Combustion and Flame

Multiple Choice Questions

Question. 1 A substance which reacts with oxygen giving heat is called a combustible substance. Which one of the following is a combustible substance? (a) Iron nail (b) Glass (c) Stone piece (d) Wood Answer. (d) Wood is a combustible substance. It is a solid fuel and produces smoke during combustion.

NCERT Exemplar Problems Class 8 Science Coal and Petroleum

NCERT  Exemplar Problems Class 8 Science Chapter 5 Coal and Petroleum

Multiple Choice Questions

Question. 1 Various materials which are obtained from nature are called natural resources. Which of the following is not a natural resource? (a) Minerals (b) Water (c) Soil (d) Plastic Answer.(d) Minerals, water and soil are natural resources but plastic is a man-made material. So, plastic is not a…

NCERT Exemplar Problems Class 8 Science Materials : Metals and Non-Metals

NCERT  Exemplar Problems Class 8 Science Chapter 4 Materials : Metals and Non-Metals

Multiple Choice Questions Question. 1 Which of the following is not a metal? (a) Copper (b) Sulphur (c) Aluminium (d) Iron Answer. (b) Copper, aluminium and iron are metals but sulphur is not a metal.

Question. 2 The substance that will be flattened on beating with a hammer is (a) crystal of iodine (b) lump of…

NCERT Exemplar Problems Class 8 Science Synthetic Fibres and Plastics

NCERT  Exemplar Problems Class 8 Science Chapter 3 Synthetic Fibres and Plastics

Multiple Choice Questions Question. 1 Pick the synthetic fibre out of the following. (a) Cotton (b) Nylon (c)Jute (d)Wool Answer. (b) Nylon Is a synthetic fibre. It is made without using any natural raw material. Cotton, jute and wool are natural fibres.

Question. 2 Which of the following is a source of rayon? (a) Wool…

NCERT Exemplar Problems Class 8 Science Micro organisms: Friend and Foe

NCERT Exemplar Problems Class 8 Science Chapter 2 Micro organisms: Friend and Foe

Multiple Choice Questions Question. 1 Which of the following reproduces only inside a host cell? (a) Bacteria (b) Virus (c) Amoeba (d) Fungus Answer.(b) Virus is a micro organism, which is in an inactive or deal form outside the body of a host. It reproduces or replicates only when it enters a host and reaches its…

CBSE Class 10 English Poetry Solutions Snake

CBSE Class 10 English Poetry Solutions Snake

1.Snakes generate both horror and fascination. Do you agree? Why? Why not? Answer. Snakes generate both horror and fascination because our reasoning often misleads us. Though snakes are creations of nature, we are afraid of them. Snakes also fascinate us but we do not understand the beauty of nature, and being human, we have the impulse to kill it even…

NCERT Exemplar Problems Class 8 Science Crop Production and Management

NCERT  Exemplar Problems Class 8 Science Chapter 1 Crop Production and Management

Multiple Choice Questions Question . 1 Which one of the following conditions is not essential to grow maize? (a) High temperature (b) Humidity (c) Low temperature (d) Rainfall Answer.(c) Maize is a kharif crop, which requires high temperature, rainfall and humidity to grow, while rabi crops require low temperature…

CBSE Class 10 English Poetry Solutions The Rime of the Ancient Mariner

CBSE Class 10 English Poetry Solutions The Rime of the Ancient Mariner

1.Look at the picture carefully and answer the questions given below: (a) What can you see in the picture? Does the man look happy? Give reasons for your answer. (b) Why does he have the bird hanging around his neck? (c) Have you heard of the expression-’ having an albatross around your neck’? What do you think it means? Does it…

CBSE Class 10 English Fiction Solutions Virtually True

CBSE Class 10 English Fiction Solutions Virtually True

1.Before reading the story, attempt the following working in groups of four or five. (a) Do you play computer games? How many hours do you spend playing games on the computer as compared to outdoor games? Answer. Yes I play computer games. I spend at least 4—5 hours in playing computer games.

(b) Make a list of your favourite games. Have a…

Viva Questions with Answers on Detection of Elements in Organic Compounds

Viva Questions with Answers on Detection of Elements in Organic Compounds Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers 1.Why is sodium metal kept under kerosene oil ? Ans. Sodium metal reacts with oxygen and moisture present in air. Kerosene oil prevents the contact of air and sodium and thus protects it from the action of moisture and oxygen. 2.Why an organic compound is…

Detection of Elements in Organic Compounds

Detection of Elements in Organic Compounds Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers Detection of elements present in an organic compound constitutes an important step in its analysis. All the organic compounds contain carbon. Hydrogen is also present in most of the organic compounds (the few exceptions are the compounds such as CCl4, CS2, etc.). In addition to carbon…

Viva Questions with Answers on Qualitative Analysis

Viva Questions with Answers on Qualitative Analysis. Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers 1. What is qualitative analysis ? Ans. The type of analysis that deals with the methods which are used to determine the constituents of a compound. 2. What is a radical ? Ans. A radical may be defined as an atom or group of atoms which carries charge and behaves as a single…

To analyse the given salt for acidic and basic radicals.

To analyse the given salt for acidic and basic radicals. Experiment Observations Inference 1. Physical examination:   (a) Noted the colour of the given salt. (b) Noted the smell of the salt.     White No specific odour   Cu2+, Mn2+, Co2+, Ni2+, Fe3+ absent. NH4+, S2- and CH3COO– may be absent. 2. Dry heating test Heated a pinch of the salt in a dry test tube and noted the following observations :…

Qualitative Analysis Analytical chemistry deals with qualitative and quantitative analysis of the substances. In inorganic qualitative analysis, the given compound is analyzed for the radicals, i.e., cation and the anion, that it contains. Physical procedures like noting the colour, smell or taste of the substance have very limited scope because of the corrosive, poisonous nature of the chemical…

Viva Questions with Answers on Quantitative Estimation (Volumetric Analysis)

Viva Questions with Answers on Quantitative Estimation (Volumetric Analysis) Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers 1. Why should weights not be lifted with hand ? Ans. This causes error in the weighing because some matter may be transferred from the hand to the weight. 2. Why is front door of the balance closed during weighing ? Ans. Opening the front door causes…

Find out the atomic mass of the monovalent alkali metal (M)

You are provided with the solution of a hydrogen carbonate of a monovalent alkali metal (M) with strength equal to 10.0 gms per litre. Find out the atomic mass of the metal (M). Chemistry Lab ManualNCERT Solutions Class 11 Chemistry Sample Papers Requirement Standard solution of HCl (say M/10 HC1). Theory The formula of metal hydrogen carbonate is MHCO3. This will react with HCl according to the…

Determine volumetrically the number of water molecules of crystallisation in washing soda

Determine volumetrically, the value of ‘n’ i.e., the number of water molecules of crystallisation in washing soda , 7.0 g of which have been dissolved per litre of the given solution. Provided Chemical Equation: Indicator. Methyl orange. End Point. Yellow to light pink (Acid in burette) Procedure Rinse and fill the burette with the standard HCl solution. Rinse the pipette with the sodium…