Question 2 :
The process of removing undesirable chemicals, biological contaminants, suspended solids and gases from contaminated water is known as:
Question 5 :
Gases like methane, nitrous oxide and water vapour also contribute towards greenhouse effect, they are also called ___________.
Question 6 :
When harmful substances such as sewage, toxic chemicals get mixed with water, then:
Question 7 :
Water that is purified and fit for drinking is known as:
Question 8 :
<span>Rain, snow or fog which is acidic in nature, is known as:</span>
Question 9 : <p>Sterilization of water by addition of chlorine for treatment against bacterial infection is known as:</p>
Question 11 :
<span>Incomplete combustion of petrol or diesel oil in automobile engines can be best detected by testing the fuel gases for the presence of __________.</span>
Question 12 :
Deforestation leads to an increase in the amount of $CO_2$ in the air:
Question 13 :
Which of the following is the main factor of water pollution?
Question 23 :
Which of the following steps were ordered by the Supreme Court to save the Taj Mahal?<br/>
Question 27 :
The average temperature of the earth's atmosphere is gradually increasing. This is due to:
Question 28 :
An increase in ${ CO }_{ 2 }$ concentration in the atmosphere will result in:
Question 31 :
Water must be purified before it is suitable for use in the home. Which processes are used to remove solid impurities and to kill bacteria?
Question 32 :
Greenhouse gases are those that can absorb and emit infrared radiation. Which of the following is not a greenhouse gas?
Question 37 :
The excess fertilizers not consumed by crops are washed away from land by rain and pollute _____.<br/>
Question 41 :
Which of the following is the most common household method for water purification?
Question 43 : <p class="MsoNormal"><span>Global warming is the result of the </span><span>increase in ________ in air.</span><span></span></p>
Question 45 :
In which of the following pairs, both of them are common greenhouse gases?
Question 48 :
__________ used as refrigerants and aerosol propellants are also greenhouse gases.
Question 49 :
If heat radiated from the earth's surface is retained, outcome will be:<br/>
Question 51 :
Which of the following is a set of green house gases?
Question 53 :
Which of the following methods is not a household method used for making drinking water safe?
Question 59 :
If water pollution continues at its present rate, it will eventually:
Question 61 :
Assertion (A): Acid rain reduces the fertility of the soil.<br/>Reason (R): Acid rain has a corroding effect on marble buildings.<br/>
Question 64 :
Read the given passage and select the correct option. <i>X </i>is a gas which occurs both in the earth's upper atmosphere (stratosphere) and at earth's ground level. <i>Y </i>are the substances which react with <i>X </i>and destroy the same. Beijing protocol was held to lay down steps to reduce <i>Y</i> released by developing and developed countries. Destruction of <i>X </i>can lead to diseases like cancer in humans.
Question 65 :
According to WHO, the soft water has 0 to _____ milligram per litre as $CaCO_3.$
Question 70 :
Among the gases (a) - (e), the gases that cause greenhouse effect are :<br/>(a ) CO$_2$<br/>(b ) H$_2$O<br/>(c ) CFCs<br/>(d ) O$_2$<br/>(e ) O$_3$<br/>
Question 71 :
Which among the following gas is most responsible for global warming?
Question 73 :
Which of the following is the main factor of water pollution?
Question 82 :
The petroleum product that has replaced coal-tar for metalling the road is:
Question 84 :
Air is a natural resource and cannot be exhausted by human activities. It is known as inexhaustible natural resource. Which of the following is another inexhaustible natural resource?<br>
Question 89 :
What odorant is added to LPG to detect the leakage with smell?
Question 90 :
Which coal is the generally the primary source of coke production?
Question 93 : Match the following.<br/><table class="wysiwyg-table"><tbody><tr><td>Column II</td><td>Column II</td></tr><tr><td>1. Paraffin wax</td><td>(p) Domestic fuel</td></tr><tr><td>2. Petrol</td><td>(q) Used for manufacturing steel</td></tr><tr><td>3. LPG</td><td>(r) Candles</td></tr><tr><td>4. Coke</td><td>(s) Aviation Fuel</td></tr></tbody></table>
Question 94 :
Choose the odd one out from the following and give reason for your choice.
Question 99 :
If materials (resources) are finished then people will struggle for ______.
Question 100 :
The strong smelling substance added to LPG, to help detect its leakage, is:
Question 103 :
Which component obtained from the refining of petroleum is used as a solvent in petrochemicals?
Question 106 :
Which of the following measure can be taken to preserve natural resources?
Question 108 :
The advantage of ________ is that it can be used directly as fuel in homes and factories due to the ability to supply through pipes.<br/>
Question 111 : <ol style="display: inline !important;"><li style="display: inline !important;">Where and when was the world's first oil well dug ?</li></ol>
Question 112 :
The average boiling point of aviation turbine fuel is closest to that of:
Question 113 :
A solid fuel formed by heating coal in the absence of air is:
Question 114 :
A form of matter has no fixed shape but has a fixed volume. An example of this form of matter is:<br/>
Question 115 :
Possibility of occurrence of coal in an area, is determined by study of
Question 117 :
The process of conversion of dead vegetation into coal is termed as:
Question 118 :
What is coal tar also known as when used in shampoo, ointment etc?
Question 120 : <b></b><ol style="display: inline !important;"><li style="display: inline !important;">The first oil well dug in India:</li></ol>
Question 121 :
Find the odd one out from the following according to the presence of methane.
Question 123 : <div>Choose the correct alternative from the choice given for the following statements:</div><div>Fuels which do not leave any residue on burning are<br></div>
Question 125 : <table class="wysiwyg-table"><tbody><tr><td><br/></td><td>List I</td><td></td><td>List II</td></tr><tr><td>A</td><td>Kerosene</td><td>I</td><td>Metalling of roads</td></tr><tr><td>B</td><td>Diesel</td><td>II</td><td>Jet aircraft fuel</td></tr><tr><td>C</td><td>Paraffin Wax</td><td>III</td><td>Generation of electricty</td></tr><tr><td>D</td><td>Bitumen</td><td>IV</td><td>Lubricants</td></tr></tbody></table>
Question 129 :
Which of the following non-renewable resource can be reused by recycling?
Question 130 :
What is the cause of a very high demand of water even though it is an inexhaustible natural resource?
Question 131 :
<span>What is formed from a natural process from mostly animal residues and is an example of fossil fuel?</span><span> </span><br/>
Question 134 :
<span>Which of the following can not be taken to conserve energy resources (like coal and petroleum)?</span>
Question 135 :
Which of the following is the best to be used as fuel?<br/>
Question 138 :
Which component of petroleum has a boiling point greater then $350^{\circ}C$?
Question 139 :
<span>Compared to oil, an advantage of using natural gas is that it:</span>
Question 140 :
Though a few (gas-based) industries have been established, good reserves of natural gas in India remain unutilized. These vast resources of natural gas can be used in the production of :
Question 141 :
Kerosene is used as fuel because it is ______  than gasoline.
Question 144 :
<SPAN class=wysiwyg-font-size-medium>Which of the following constituents of petroleum is used as a solvent for dry cleaning?</SPAN>
Question 145 :
<span>The dead aquatic organisms that were buried under the sand and clay of the sea bed, were converted to petroleum owing to:</span><br/>
Question 146 :
<span>Which property of coke makes it useful in the manufacture of steel?</span>
Question 147 :
<span>When an oil well is drilled through rocks, what comes out first?</span>
Question 148 :
Assertion: Fuel oil is better than coal for use in industries.<SPAN><BR>Reason: It has a high calorific value than coal and does not leave smoke or ash on burning.</SPAN>
Question 154 :
A chemical process in which a substance reacts with oxygen to give off heat is called:
Question 169 :
The substance which is expected to have the highest ignition temperature out of the following is _________.<br>
Question 176 :
<span>Which of the following releases least amount of pollutants on combustion?</span><br/>
Question 180 :
Which of the following chemical starts the combustion process in the matchstick?
Question 181 :
Coal, petroleum, natural gas and propane are fossil fuels. They are called fossil fuels because ________.
Question 184 : <ol style="display: inline !important;"><li style="display: inline !important;">What is geothermal energy ?</li></ol>
Question 186 :
Which of the following is not required for combustion to take place?
Question 188 :
$I$. The most significant way in which humans are exposed to mercury is through drinking water.<br/>$II$. A great deal of mercury enters the atmosphere because of coal-burning power plants.
Question 190 :
On placing an inverted tumbler over a burning candle, the flame extinguishes after some time. This is because of the non-availability of:<br>
Question 198 :
If you watch a burning candle carefully, you will find different colurs in the flame. Which is the hottest part of the candle flame?
Question 201 :
A thin paper cup filled with water does not catch fire when placed over a flame. This is because:<br/>
Question 208 :
The cooking gas burns rapidly and produces heat and light. Such combustion is called _________.<br/>
Question 209 :
<span>The innermost zone of candle flame is the least hot due to the presence of :</span><br/>
Question 210 :
A chemical process in which a substance reacts with oxygen to give off heat is called as:<br/>
Question 211 :
If butane on combustion gives carbon monoxide, find the number of $O_ 2$ molecules required.
Question 212 :
The calorific value of a fuel is expressed in a unit called as ______________.<br>
Question 213 :
A thin paper cup filled with water does not catch fire when placed over a flame. This is because:<br>
Question 214 :
Shyam was cooking potato curry on a chulha. To his surprise, he observed that the copper vessel was getting blackened from outside. It may be due to:<br>
Question 218 :
What kind of combustion is undergone by ignition of a cracker?
Question 225 : During burning of candle, different zones of combustion in the flame are listed below:-<div>a) Outermost zone<br/>b) Innermost zone<br/>c) Middle zone</div><div><br/>The correct order of temperature of zones is :</div>
Question 226 :
Which of the following statements gives the correct distinction between the burning of carbon compounds and respiration?
Question 229 :
A burning substance will ___________, if the temperature falls below its ignition temperature.
Question 236 :
All fuels undergo combustion. Identify the fuel which undergoes slow combustion on burning.
Question 237 :
Which of the following does not represent characteristic of a good fuel?
Question 239 : <p><span>Choose the correct statement about inflammable substances from the following. They have:</span></p>
Question 241 :
<SPAN class=wysiwyg-font-size-medium>The lowest temperature at which a substance starts burning is called its:</SPAN>
Question 244 : Match column 'A' with column 'B', concerning the characteristics of a flame and its zones.<table class="wysiwyg-table"><tbody><tr><td>'A'</td><td>'B'</td></tr><tr><td>a. Dark inner zone</td><td>1. Hottest part (No carbon)</td></tr><tr><td>b. Blue zone</td><td>2. Partial combustion</td></tr><tr><td>c. Luminous zone</td><td>3. Unburnt vapours of wax</td></tr><tr><td>d. Non-luminous zone</td><td>4. Complete combustion</td></tr></tbody></table>
Question 245 :
Which type of fire extinguisher is used to extinguish fire caused by burning oil and petrol?
Question 246 :
A paper-wrapped tightly around the joint of a brass tube and its wooden handle is put in a flame, the paper will:
Question 248 :
In foam type fire extinguisher, _______ is responsible to put off fire.
Question 250 :
Metals are good conductors of electricity. Which metal don't conduct electricity in a solid state?
Question 253 :
Elements which form positively charged ions by losing electrons in all chemical reaction are called:
Question 254 :
The ability of metals to be drawn into thin wires is known as:<br/>
Question 255 : $X+CuSO_4  \rightarrow XSO_4 + Cu$,<br/>$Y+CuSO_4  \rightarrow YSO_4 +Cu$ <div>In these reactions X and Y may be :<br/></div>
Question 256 :
Which of the following metal is a preferred material for making conducting wires and in electrical appliances? Even though silver is the best conductor of electricity.
Question 257 :
Non-metal which is essential for our life and all living beings inhale it during breathing is :<br/>
Question 258 :
The property of metals by virtue of which, they produce sound when struck is called :
Question 260 :
Non-metal that has a metallic lustre and sublimes on heating is : <br/>
Question 264 :
A purple coloured non-metal forms a brown solution in alcohol which is applied on wounds as an antiseptic. The non-metal is :<br>
Question 265 :
The property by which some metals when hammered or stretched break into pieces is called:
Question 266 :
Which one of the following four metals shows negligible chemical reactivity under normal conditions?
Question 267 : <div><span>Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured.</span><br/></div><div><br/></div>The allotropic form of a non-metal, which is a good conductor of electricity is: <br/>
Question 269 :
Metals are _________ i.e., they make sound when hit with an object.
Question 270 :
Metals are generally hard. But which of the following metal is an exception that it can be cut with a knife?<br>
Question 275 :
The substance that will be flattened on beating with a hammer is:<br>
Question 276 : When Amrita was asked to pick up a few articles from a collection, she picked up the following:<br/>Wooden scale, glass test tube and paper basket.<div>Which article is she most likely to pick up next?<br/></div>
Question 277 :
Which of the following non-metal is a good conductor of electricity?
Question 278 :
Materials which can be drawn into wires are called ductile. Which of the following is not used as a ductile material?<br>
Question 279 :
A very reactive non-metal which does not occur in nature in the free state and is present in the bones, teeth and nervous tissue of animals is:
Question 280 :
Metal that exists in the liquid state at room temperature is :<br/>
Question 281 :
Give the product of following metal displacement reaction.<br/>$Pb(s) + CuCl_2(aq) \rightarrow$
Question 284 :
Select the objects from the following which have a characteristic shine known as lustre   _____________.
Question 287 :
When a little sulphur in a spoon is heated, it burns with a blue flame which slowly disappears after some time and we can feel a pungent odour. This pungent odour is due to:
Question 288 :
Amit has learned that non-metals on beating with a hammer are generally broken into pieces. Which of the following is a non-metal?
Question 291 :
Which of the following non-metal is commonly used as pesticides and photography?
Question 294 :
<span><span><span><span><span><span><span><span><span><span><span>The oxides of _____ which react with water to form acids are called acidic oxides.<br/></span></span></span></span></span></span></span></span></span></span></span>
Question 295 :
Which one of the following nutrient is not available in fertilizers?
Question 298 :
The non-metal that has a metallic lustre and sublimes on heating is_______.<br/>
Question 299 :
An element $A$ is soft and can be cut with a knife. This is very reactive with air and cannot be kept open in the air. It reacts vigorously with water. The element $A$ is:<br/>
Question 301 :
When a base combine with metal it forms metal salt/base and releases:
Question 302 :
Metals can be hammered into thin sheets. This property is called:
Question 303 :
Which one of the following ions in an aqueous solution would not be precipitated as a metal by the addition of calcium metal?
Question 305 :
Which of the following element does not occur in liquid state?
Question 307 :
The density of non metals is _____ when compared with metals.<br/>
Question 309 :
Which one of the following statement, about glass is not correct ?<span><br></span>
Question 315 :
<span>Which of the following statements is correct about the physical properties of metals and non-metals?</span><br/>
Question 316 :
The red or orange coating that forms on the surface of iron when exposed to air and moisture for some time is called:
Question 317 :
Which of the following non-metals react and catches fire on exposure to air?<br>
Question 321 : <div><span>Non-metals are usually poor conductors of heat and electricity. They are non-lustrous, non-sonorous, non-malleable and are coloured. </span><span>The non-metal which is known to form the largest number of compounds is:</span></div>
Question 324 :
When metals reacts with base, the product obtained is_____ and ______gas.
Question 325 :
The substance that will be flattened on beating with a hammer is:
Question 328 :
The ability of metals to be drawn into thin wire is known as_____.
Question 330 :
Generally, non-metals are not lustrous. Which of the following non-metals is lustrous?
Question 331 :
An element that conducts heat energy well and is easily shaped is a
Question 332 :
Which of the following components of air does not contribute to the tarnishing of metals?
Question 336 :
An oxide of a metal used for making soft drinks is :
Question 338 :
The reaction of aluminum atoms displacing hydrogen ions from sulphuric acid can be represented as:
Question 343 : <div><span>Telephone instruments, plastic toys, ball point pens, plastic bowls are examples of:</span><br/></div>
Question 351 :
Which of the following are uses of plastics in health care industry?
Question 358 :
A material which don't gets decomposed through natural processes is called 
Question 364 :
A material which is not easily decomposed by natural processes is termed as :
Question 365 :
Which of the following statement is true about PVC (polyvinyl chloride) and polythene<span>?</span>
Question 372 :
What kind of material should be preferred for clothes during summer?
Question 374 : <div><span>$X$ is a thread or filament from which $Y$ is made. If prepared from plants and animals, it is known as $Z$ fibres whereas by humans it is known as $W$ fibres. Artificial or synthetic fibres are nylon, rayon, polyester, acrylic, etc.</span><br/></div><div><span><br/></span></div>What is $Z$?
Question 377 :
Suhana wants to present her friend gift made from plant fiber. Which of the following will she select?
Question 382 :
The most suitable material for the preparation of handles of cooking utensils is :<br>
Question 383 :
Which of the following material is not used in making plate?<br/>
Question 385 :
Padma observes that screwdrivers have a plastic handle and electrical wires have a plastic covering. What is the reason for the use of plastic in electric appliances?
Question 388 :
Electrical wires have a coating of an insulated material. The material generally used is:
Question 393 :
An example of thermosetting plastic, which is also a poor conductor of electricity, is:
Question 394 :
Why the waste created by plastics is not friendly with environment?
Question 395 : Match the column A and B<br><table class="wysiwyg-table"><tbody><tr><td>Column A</td><td>Column B</td></tr><tr><td>(i) Thermoplastics</td><td>(a) Handles of utensils, floor tiles</td></tr><tr><td>(ii) Thermosetting plastics</td><td>(b) Melamine</td></tr><tr><td>(iii) Biodegradable</td><td>(c) Teflon</td></tr><tr><td>(iv) Fire proof plastic</td><td>(d) Wood</td></tr><tr><td>(v) Oil and water do not stick</td><td>(e) Combs, containers</td></tr></tbody></table>
Question 396 :
Which of the followings prove that plastics do not make food and medicine toxic?
Question 401 :
Which of the following is a method to control water pollution?
Question 402 :
The substance which undergoes decomposition by the microbial action is called a:
Question 403 :
_____ waste products can also be called green waste, or organic waste.
Question 404 : Which of the following represents the correct match for items in Column A with those in Column B.                   <div>Column A.                       Column B.<br/>I. Nylon                        (i) Thermoplastic<br/>II. PVC                         (ii) Thermosetting plastic<br/>III. Bakelite                  (iii) Fiber</div>
Question 407 :
Containers that are lightweight, affordable, durable, and easy to handle are generally made up of :
Question 409 :
Electrical wires have a coating of an insulting material. The material generally used for insulation is :<br/>
Question 410 :
Which among the following is a poor conductor of heat and electricity?
Question 416 :
<span>For which of the following purposes is a coating of melamine plastic used?</span>
Question 421 :
The most suitable material for the preparation of handles of cooking utensils is
Question 422 :
Match the following with the correct answers.<br/>(a) Scouring                 (i) Yields silk fibers<br/>(b) Mulberry leaves    (ii) Cleaning sheared skin <br/>(c) Sheep                    (iii) Food of silk worm.<br/>(d) Cocoon                 (iv) Wool yielding animal. 
Question 423 :
Which of the following properties of synthetic plastic makes it the most convenient to use?
Question 428 :
If the plastics are hard, become soft and readily workable by the addition of certain compounds called:
