Question 1 : Click and choose the correct option.<br>Which of the following is the best conductor of electricity?

Question 2 : Click and choose the correct option.<br>Smaller the area on which a force acts, lesser is the effect of the force.

Question 3 : 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 4 : Click and choose the correct answer.<br>Sound travels faster in a _____________ medium.

Question 5 : Click and choose the correct option.<br>In convection current, hot air moves

Question 6 : Click and choose the correct answer.<br>A mirror in which the inner hollow surface is the reflecting surface is called a

Question 7 : Click and choose the correct answer.<br>To measure the density of a solid, only its mass has to be measured.

Question 8 : Click and choose the correct option.<br>The process of conversion of a solid into its liquid state, at a particular temperature, on heating is called _________ or fusion.

Question 9 : Click and choose the correct answer.<br>The moment of force depends upon

Question 10 : Click and choose the correct option.<br>A manometer is used to measure atmospheric pressure.

Question 11 : Click and choose the correct answer.<br>The shortest distance travelled between two points is called

Question 12 : Click and choose the correct option.<br>Power can be transformed from one form to another.

Question 13 : Click and choose the correct option.<br>A ____________ is an instrument used to measure the relative density of liquids.

Question 14 : Click and choose the correct answer.<br>A ___________ is a device used to measure the pressure exerted by a liquid.

Question 15 : Click and choose the correct answer.<br>If the magnitude of a force applied increases, the work done

Question 16 : Click and choose the correct answer.<br>In solids, the intermolecular force of attraction is

Question 17 : Click and choose the correct option.<br>Evaporation occurs at the surface of a

Question 18 : Click and choose the correct option.<br>The energy stored in a compressed spring is

Question 19 : Click and choose the correct answer.<br>A/An _________ is defined as the smallest unit of matter.

Question 20 : Click and choose the correct answer.<br>The density of ice is more than that of water.

Question 21 : Click and choose the correct option.<br>What is the smallest unit of an element called?

Question 22 : Click and choose the correct option.<br>The energy possessed by a flowerpot placed at the rooftop of a building is

Question 23 : Click and choose the correct option.<br>The moment of a force does not depend upon the magnitude of the force applied.

Question 24 : Click and choose the correct answer.<br>Pitch of a sound depends on the ____________.

Question 26 : Click and choose the correct answer.<br>A battery is a collection of cells in

Question 27 : Click and choose the correct answer.<br>The process that occurs when water changes into water vapours at 30 &#8451; is called

Question 28 : Click and choose the correct option.<br>Force is an act of push or pull which changes or tends to change the state of rest or of uniform motion of a body.

Question 29 : Click and choose the correct answer.<br>Concave mirrors are used in solar heaters.

Question 30 : 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 31 : Click and choose the correct answer.<br>Drum produces sound due to vibration of its

Question 32 : 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 33 : Click and choose the correct answer.<br>If the object is in front of a convex mirror, then the image is always

Question 35 : Click and choose the correct option.<br>When the temperature of the liquid increases, what happens to the average kinetic energy of the molecules?

Question 36 : Click and choose the correct option.<br>The mode of transfer of heat in which the particles actually move is called

Question 37 : Click and choose the correct option.<br>If a force has a tendency to turn or rotate a body in clockwise direction, the moment of force is called anticlockwise moment.

Question 38 : Click and choose the correct answer.<br>The boiling of a pure liquid occurs at a fixed temperature called

Question 39 : 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 40 : 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 42 : To obtain a given moment of force for turning a body, the force needed can be decreased by

Question 43 : <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 45 : two coolies A and B do the same work in 1minute and 2minutes respectively. The power spent is

Question 47 : The process of a gas converting directly into solid is called vaporization.