Question 10 :
Which one of the following is not a function of W.H.O.?<br/>
Question 13 :
Vaccine is a preparation consisting of a weak or killed pathogen to induce resistance against a particular disease.
Question 18 :
Click and choose the correct answer.<br>Fields have to be regularly _________ according to the needs of crops.
Question 19 :
Click and choose the correct answer.<br>The soil is prepared by loosening and turning it. This process is called _________.
Question 21 :
Click and choose the correct answer.<br>The excessive use of _________ affects the salinity of soil and causes water and soil pollution.
Question 22 :
Click and choose the correct option.<br>The ___________ refers to a series of research and development and technology transfer programmes that took place between 1940s to 1960s.
Question 23 :
Click and choose the correct option.<br>The rearing, breeding and management of fishes on a large scale is called __________.
Question 24 :
Click and choose the correct answer.<br>The place where bees are cultured and bred to get commercial products is called ______.
Question 25 :
Click and choose the correct answer.<br>The care, breeding and management of honeybees is called __________.
Question 26 :
Click and choose the correct option.<br>The excessive use of __________ affects the salinity of soil and causes water and soil pollution.
Question 27 :
Click and choose the correct option.<br>Unwanted, wild and uncultivated plants are known as _________.
Question 28 :
Click and choose the correct option.<br>__________ were the first crops to be cultivated.
Question 29 :
Click and choose the correct answer.<br>Aspergillosis is a disease occuring in birds caused by a
Question 30 :
Click and choose the correct option.<br>________ programme was started to make India one of the largest producers of milk in the world.
Question 31 :
Click and choose the correct option.<br>The process of raising crops in a field for food and other useful products is called _______________.
Question 32 :
Click and choose the correct answer.<br>All animals domesticated by human beings for their usefulness constitute _______.
Question 35 :
Click and choose the correct option.<br>All animals domesticated by human beings for their usefulness constitute ___________.
Question 42 :
The plants that grow on other plants in order to get sunlight are called:
Question 44 :
A group of plants native to a particular region constitutes the fauna
Question 51 :
Click and choose the correct option.<br>Water that easily forms rich lather (soap bubbles) with soap is called __________.
Question 53 :
Click and choose the correct option.<br>___________ substances absorb moisture from the atmosphere and get wet.
Question 54 :
Click and choose the correct option.<br>Magnesium reacts with hot water to form _____________ and hydrogen.
Question 55 :
Click and choose the correct answer.<br>The purest form of natural source of water is
Question 56 :
Click and choose the correct answer.<br>Permanent hardness of water is caused due to
Question 57 :
Click and choose the correct option.<br>Liquids that dissolve in water are called _________ liquids.
Question 58 :
Click and choose the correct option.<br>Permanent hardness of water is caused due to chlorides and __________ of calcium and magnesium.
Question 59 :
Click and choose the correct answer.<br>An atom that loses electrons becomes a positively-charged ion called
Question 60 :
Click and choose the correct answer.<br>2Mg(s) + O<sub><small>2</small></sub>(g) → 2MgO(s) is an example of a
Question 61 :
Click and choose the correct answer.<br>Attractive forces that hold atoms or ions together to form molecules or compounds are called
Question 62 :
Click and choose the correct answer.<br>AB → A + B is the representation of a
Question 63 :
Click and choose the correct answer.<br>When two atoms share electrons, they form a bond called
Question 64 :
Click and choose the correct answer.<br>When chlorine gas is passed through an aqueous solution of potassium bromide, the solution turns brown due to the liberation of
Question 65 :
Click and choose the correct answer.<br>As you move down the activity series, the reactivity of metals
Question 66 :
Click and choose the correct option.<br>Sodium chloride is a/an __________ compound.
Question 67 :
Click and choose the correct option.<br>Potassium chlorate on heating in the presence of ___________ as a catalyst gives potassium chloride and oxygen.
Question 68 :
Click and choose the correct option.<br>When limestone (calcium carbonate) is heated, it breaks up into calcium oxide (quicklime) and ______________.
Question 69 :
Click and choose the correct answer.<br>Solutions of silver nitrate and sodium chloride react to form a white precipitate of
Question 71 :
Click and choose the correct option.<br>Combination reaction is also known as ___________ reaction.
Question 72 :
Click and choose the correct option.<br>When electricity is passed through acidified water, it decomposes to give _______ and oxygen.
Question 73 :
Click and choose the correct option.<br>Attractive forces that hold atoms or ions together to form molecules or compounds are called __________ bonds.
Question 74 :
Click and choose the correct option.<br>When a piece of magnesium ribbon is burned, it forms a white powder of __________.
Question 75 :
Click and choose the correct option.<br>A neutralization reaction is a type of ____________ in which an acid and a base react together to form a salt and water.
Question 76 :
Click and choose the correct answer.<br>Chemical reactions in which heat energy is evolved are called
Question 77 :
Click and choose the correct option.<br>The substances produced because of a reaction are called ____________.
Question 78 :
Click and choose the correct option.<br>When decomposition is carried out by heating, it is called _________.
Question 81 :
A stream of particles emerging from anode and travelling towards cathode are called cathode rays.
Question 84 :
When ferrous sulphide is mixed with dilute acid, it gives a pleasant odour.
Question 88 :
The rate of formation of a solution can be increased by stirring.
Question 89 : Look at the picture carefully and answer the following questions<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/ICSE%20-%20Class%208/5fe4dd45b46ca315374dc1ce" /><br>What is the maximum number of electrons each shell can hold?
Question 90 :
An element with a valency of 1 is said to be monovalent.
Question 92 :
Centrifugation is used to separate the components of a mixture based on the
Question 97 :
Food grains can be stored in an atmosphere of ________ to protect them from insects.
Question 100 :
Metals are arranged in the increasing order of their reactivity in the metal activity series.
Question 101 :
Click and choose the correct option.<br>A manometer is used to measure atmospheric pressure.
Question 102 :
Click and choose the correct answer.<br>Factors on which the loudness of a sound depends are
Question 103 :
Click and choose the correct answer.<br>Work is said to be done if a force is applied on a body.
Question 104 :
Click and choose the correct answer.<br>The molecules of liquids are less tightly packed in a small volume as compared to solids.
Question 105 :
Click and choose the correct answer.<br>A hydrometer is usually made of metal.
Question 107 :
Click and choose the correct answer.<br>Which of the following have no definite volume?
Question 109 :
Click and choose the correct option.<br>The process of a liquid changing into its vapour at any temperature below its boiling point is called ____________.
Question 110 :
Click and choose the correct option.<br>The temperature at which a liquid boils and changes rapidly into a gas is called ____________.
Question 111 :
Click and choose the correct answer.<br>Pitch of a sound depends on the _____________ of vibration.
Question 112 :
Click and choose the correct answer.<br>A/An _________ is defined as the smallest unit of matter.
Question 113 :
Click and choose the correct answer.<br>The moment of force depends upon
Question 114 :
Click and choose the correct option.<br>The energy possessed by a flowerpot placed at the rooftop of a building is
Question 115 :
Click and choose the correct answer.<br>A __________ is used to measure the atmospheric pressure.
Question 116 :
Click and choose the correct option.<br>The SI unit of moment of force is N m (newton metre).
Question 117 :
Click and choose the correct answer.<br>The colour code for a live wire is
Question 118 :
Click and choose the correct option.<br>The change of a substance from its liquid state to its gaseous state at any temperature below its boiling point is called
Question 119 :
Click and choose the correct option.<br>Power can be transformed from one form to another.
Question 120 :
Click and choose the correct answer.<br>Which of the following is a non-conductor of electricity?
Question 121 :
Click and choose the correct answer.<br>Which of the following cannot be compressed?
Question 122 :
Click and choose the correct answer.<br>A mirror in which the inner hollow surface is the reflecting surface is called a
Question 124 :
Click and choose the correct answer.<br>Sound travels faster in a _____________ medium.
Question 125 :
Click and choose the correct answer.<br>The top thick pin of a plug is always connected to the
Question 126 :
Click and choose the correct option.<br>The moment of a force does not depend upon the magnitude of the force applied.
Question 127 :
Click and choose the correct answer.<br>The pressure exerted by a liquid is directly propotional to its __________.
Question 128 :
Click and choose the correct answer.<br>The process that occurs when water changes into water vapours at 30 ℃ is called
Question 129 :
Click and choose the correct answer.<br>The SI unit of pressure is
Question 130 :
Click and choose the correct answer.<br>When you climb up the stairs, your potential energy increases.
Question 131 :
Click and choose the correct answer.<br>The flotation and sinking ability of a solid is not dependent upon its density.
Question 132 :
Click and choose the correct option.<br>Water stored in a reservoir above a dam possess
Question 133 :
Click and choose the correct option.<br>The effect of a force depends upon the area over which it acts.
Question 134 :
Click and choose the correct answer.<br>The geometrical centre of a spherical mirror is called the
Question 135 :
Click and choose the correct option.<br>Which of the following is the best conductor of electricity?
Question 136 :
Click and choose the correct option.<br>The image formed due to actual meeting of the reflected rays at a point is called a
Question 137 :
Click and choose the correct option.<br>If the displacement of a body is zero, then the work done by the force acting on the body is
Question 138 :
Click and choose the correct answer.<br>A/An __________ is defined as the smallest unit of an element.
Question 139 :
Click and choose the correct option.<br>The kinetic energy of a moving body depends on its mass and
Question 140 :
Click and choose the correct answer.<br>Concave mirrors are used in solar heaters.
Question 141 :
Click and choose the correct answer.<br>The intermolecular force is inversely proportional to the _________.
Question 142 :
Click and choose the correct answer.<br>A ___________ is a device used to measure the pressure exerted by a liquid.
Question 143 :
Click and choose the correct answer.<br>If the magnitude of a force applied increases, the work done
Question 144 :
Click and choose the correct option.<br>What is the smallest unit of an element called?
Question 145 :
Click and choose the correct answer.<br>If the force applied on a body decreases, then the work done on it will
Question 146 :
Click and choose the correct answer.<br>The shortest distance travelled between two points is called
Question 147 :
Click and choose the correct answer.<br>To measure the density of a solid, only its mass has to be measured.
Question 148 :
Click and choose the correct option.<br>Evaporation occurs at the surface of a
Question 149 :
Click and choose the correct answer.<br>Pitch of a sound depends on the ____________.
Question 150 :
Click and choose the correct answer.<br>In solids, the intermolecular force of attraction is
Question 151 :
Click and choose the correct answer.<br>The relative density of a substance is defined as the ratio of the density of the substance to the density of water at 4 °C.
Question 152 :
Click and choose the correct option.<br>__________ is a mixture of gases and therefore, convection currents can be set up in air .
Question 153 :
Click and choose the correct option.<br>Which of the following helps us to record the electrical energy we consume in our homes?
Question 154 :
Click and choose the correct option.<br>The force of attraction between the molecules of the same kind is called the force of ___________.
Question 155 :
Click and choose the correct answer.<br>There are four iron rods R1, R2, R3 and R4 of the same dimensions. The temperature of R1 is raised to 500°C, that of R2 to 250°C, that of R3 to 1000°C and that of R4 to 800°C. Which rod will have the maximum linear expansion?
Question 156 :
Click and choose the correct answer.<br>The pitch of a guitar depends on ___________.
Question 157 :
Click and choose the correct option.<br>What is the process through which a solid directly changes from the solid state to its vapour state on heating?
Question 158 :
Click and choose the correct answer.<br>Transferring a charge by touching is called charging by
Question 159 :
Click and choose the correct option.<br>The process by which a liquid change into its gaseous state at some fixed temperature by absorption of heat energy is called
Question 160 :
Click and choose the correct option.<br>The straight line passing through the pole and the centre of curvature of the spherical mirror is called the
Question 161 :
Click and choose the correct answer.<br>The characteristic of a sound that differentiates a shrill sound from a hoarse sound is called
Question 162 :
Click and choose the correct answer.<br>The type of thermal expansion that takes place in gases is
Question 163 :
Click and choose the correct option.<br>In a system the sum of all the electric charges is always
Question 164 :
Click and choose the correct answer.<br>The characteristic of sound which distinguishes a feeble sound from a loud one of the same frequency is called the
Question 165 :
Click and choose the correct option.<br>The ray of light emerging out of a parallel sided glass slab is always parallel to the incident ray.
Question 166 :
Click and choose the correct option.<br>A real image is always erect.
Question 167 :
Click and choose the correct answer.<br>A rainbow is formed because water droplets of the atmosphere behave like glass slabs.
Question 168 :
Click and choose the correct option.<br>Charges can be exchanged between two bodies by
Question 169 :
Click and choose the correct option.<br>When object is placed at infinity, the nature of the image formed by the concave mirror is
Question 170 :
Click and choose the correct answer.<br>The mode of transfer of heat energy through a fluid by the actual movemnet of the molecules is called ___________.
Question 171 :
Click and choose the correct answer.<br>Drum produces sound due to vibration of its
Question 172 :
Click and choose the correct option.<br>_________ expand the most on heating.
Question 173 :
Click and choose the correct answer.<br>_____________ has maximum value at the sea level and decreases with increase in altitude.
Question 174 :
Click and choose the correct option.<br>Which of the following is a safety wire that connects the metal case of the appliances to the earth?
Question 175 :
Click and choose the correct answer.<br>Sounds above 80 dB can be tolerated.
Question 176 :
Click and choose the correct option.<br>At higher temperature solid molecules vibrate faster and take up
Question 177 :
Click and choose the correct answer.<br>The total force acting on a given surface is known as
Question 178 :
Click and choose the correct answer.<br>The law governing the transmission of pressure through liquids was stated by the French physicist, ____________.
Question 179 :
Click and choose the correct answer.<br>The liquid that expands the minimum on heating is
Question 180 :
Click and choose the correct option.<br>The volume of irregular solids can be found by either using a ________ or a Eureka can.
Question 181 :
Click and choose the correct answer.<br>A process by which a substance directly changes from the solid state to its vapour (gaseous) state is called
Question 182 :
Click and choose the correct answer.<br>The image formed when reflected rays only appear to meet but do not actually meet is
Question 183 :
Click and choose the correct answer.<br>Musical sounds are caused due to _____________.
Question 184 :
Click and choose the correct answer.<br>The length of an iron rod increases from 10 m to 11 m, when kept over a burner flame. This increase in length is due to
Question 185 :
Click and choose the correct option.<br>The mode of transfer of heat in which the particles actually move is called
Question 186 :
Click and choose the correct option.<br>The phenomenon of light that causes the formation rainbow is
Question 187 :
Click and choose the correct option.<br>Which of the following natural phenomena takes place due to convection currents?
Question 188 :
Click and choose the correct option.<br>The constant upward and downward circulation of fluid forms currents in the medium called _____________.
Question 189 :
Click and choose the correct answer.<br>When the temperature of a liquid increases, the average kinetic energy of its molecules
Question 190 :
Click and choose the correct answer.<br>The factors on which linear expansion depends on are
Question 191 :
Click and choose the correct option.<br>Lightning and thunder along with heavy rains is called
Question 192 :
Click and choose the correct option.<br>In how many ways an electroscope can be charged?
Question 193 :
Click and choose the correct option.<br>The point on the principal axis of a spherical mirror, where all the parallel rays of light incident on mirror, parallel to the principal axis, meet or appear to meet after reflection is
Question 194 :
Click and choose the correct answer.<br>An electric fuse is always connected to the
Question 195 :
Click and choose the correct answer.<br>A sound produced by guitar and violin with the same pitch and loudness is distinguished by
Question 196 :
Click and choose the correct answer.<br>When an object is placed at the principal focus of a concave mirror, the image will be formed at the
Question 198 :
Click and choose the correct answer.<br>The constant upward and downward circulation of fluid forms currents in the medium called convection currents.
Question 199 :
Click and choose the correct option.<br>The definite path in which the electrons revolve around the nucleus is called
Question 200 :
Click and choose the correct answer.<br>A flute produces sound due to the vibration of
Question 201 :
Smaller the area on which a force acts, _________ is the effect of the force.
Question 203 :
A man exerts same pressure on the ground whether he is standing or he is lying.
Question 210 :
Less force is needed when applied at a farther distance from the pivoted point.
Question 211 :
For a given thrust,pressure is more on a surface of large area.
Question 213 :
The pressure on a surface increases with an increase in the thrust on the surface.
Question 214 :
To obtain a given moment of force for turning a body, the force needed can be decreased by
Question 216 :
It is easier to hammer a blunt nail into a piece of wood than a sharply pointed nail.
Question 220 :
In a door, a handle is provided farthest from the hinges.
Question 221 :
Find the area of a body which experiences a pressure of 50000 Pa by a thrust of 100 N?
Question 224 : <table> <tr><th>Column I </th> <th>Column II </th> </tr> <tr><td>(a) Camel</td> <td>(i) broad and deep foundation</td> </tr> <tr><td>(b) Truck</td> <td>(ii) broad feet</td> </tr> <tr><td>(c) Knife</td> <td>(iii) six or eight tyres</td> </tr> <tr><td>(d) High building</td> <td>(iv) sharp cutting edge</td> </tr> <tr><td>(e) Thrust</td> <td>(v) atm</td> </tr> <tr><td>(f) Moment of force</td> <td>(vi) N</td> </tr> <tr><td>(g) Atmospheric pressure</td> <td>(vii) N m</td> </tr> </table>
Question 227 :
A body weighing 5 kgf, placed on a surface of area 0.1 m{tex}^2{/tex}, exerts a thrust on the surface equal to
Question 231 :
A mercury thermometer makes use of the property of expansion of liquids on heating.
Question 232 :
Two rods A and B of the same metal, same length, but one solid and other hollow are heated to the same rise in temperature. Then
Question 236 :
A given volume of alcohol and the same volume of water are heated from the room temperature to the same temperature then
Question 243 :
Telephone wires are kept tight between the two poles in winter.
Question 245 :
Solids expand the least and gasses expand the most on being heated.
Question 246 :
All molecules of a liquid take part in the process of evaporation.
Question 248 :
Two rods A and B of the same metal, but of length 1m and 2m respectively are heated from 0 degree celsius to 100 degree celsius. Then
Question 249 :
All solids expand by the same amount when heated to the same rise in temperature.
Question 250 :
Equal volumes of different liquids expand by the different amount when they are heated to the same rise in temperature.
