What kind of elasticity is used in (a) suspension bridge (b) an automobile tyre (c) an automobile drive shaft (d) a coil spring (e) a water lift pump (rubber heels?

What kind of energy is possessed by the following ? (a) A stone kept on roof-top. (b) A running car. (c) Water stored in the reservoir of a dam. (d) A compressed spring. (e) A stretched rubber band.

Starting out on a trip into the mountains, you inflate the tires on your automobile to a recommended pressure of 3.21xx10^(5) Pa on a day when the temperature is - 5.0^(@)C . You drive to the beach, where the temperature is 28.0^(@)C . Assume that the volume of the tire has increased by 3%. What is the final pressure in the tyres?

The boiling point elevation and freezing point depression of solutions have a number of partical applications. Ethylene glycol (CH_(2)OH-CH_(2)OH) is used in automobile radiatiors as an antifreeze because it lowers the freezing point of the coolant. The same substance also helps to prevent the radiator coolant from boiling away by elevating the boiling point. Ethylene glycol has low vapour pressure. We can also use glycerol as an antifreeze. In order for the boiling point elevation to occur, the solute must be non-volatile, but no such restriction applies to freezing point depression. For example, methanol (CH_(3)OH) , a fairly volatile liquid that boils only at 65^(@)C , is sometimes used as an antifreeze in automobile radiators. 620 g glycol is added to 4 kg water in the radiator of car. What amount of ice will separate out at -6^(@)C ?

The stress strain graph for a metal wire is shown in the fig. Up to the point E, the wire returns to its original state O along the curve EPO, when it is gradually unloaded. Point B corresponds to the fracture of the wire. (a) Up to what point on the curve is Hooke's law obeyed? (this point some times called proportional limits). (b) Which point on the curve corresponding to elastic limit or yield point of the wire? (c ) Indicate the elastic and plastic regions of the stress-strain graph. (d) Describe what happens when the wire is loaded up to a stress corresponding to the point A on the graph and then unloaded gradually. In particular explain the dotted curve. (e) What is peculiar about the portion of the stress- strain graph from C to B? Up to what stress can the wire be subjected without causing fracture?

Pollution is controlled by (a) Banning atomic blasts (b) Use of electrically operated automobiles (c) Sewage treatment (d) All of the above

(a) What is the reaction which a taking place ? (b) Give the function of acidified copper sulphate solution. (c) Give a reaction in which acetylene gas is prepared by synthesis reaction. (d) Compare the reaction of acetylene with bromine water and liquid bromine. (e) What happens when acetylene is heated in copper tube at 600^@C ?

The boiling point elevation and freezing point depression of solutions have a number of partical applications. Ethylene glycol (CH_(2)OH-CH_(2)OH) is used in automobile radiatiors as an antifreeze because it lowers the freezing point of the coolant. The same substance also helps to prevent the radiator coolant from boiling away by elevating the boiling point. Ethylene glycol has low vapour pressure. We can also use glycerol as an antifreeze. In order for the boiling point elevation to occur, the solute must be non-volatile, but no such restriction applies to freezing point depression. For example, methanol (CH_(3)OH), a fairly volatile liquid that boils only at 65^(@)C, is sometimes used as an antifreeze in automobile radiators. 124 g each of the two reagents glycol and glycerol are added in 5 kg of water of the radiators in two cars. Which of the following statements is wrong? (a)Both will act as antifreeze. (b)Glycol will be better. (c)Glycerol is better because its molar mass is greater than glycol. (d)all of these

A glass full of water upto a height of 10 cm has a bottom of are 10 cm^(2) , top of area 30cm^(2) and volume 1 litre. (a) Find the force exerted by the water on the bottom. (b) Find the resultant force exerted by the sides of the glass on the water. (c ) If the glass is convered by a jar and the air inside the jar is completely pumped out, what will be the answer to parts (a) and (b). (d) If a glass of different shape is used, provided the height, the bottom area, the top area and the volume are unchanged, will the answer to parts (a) and (b) change. Take g=10m//s^(3) , density of water =10^(3) kg//m^(3) and atmospheric pressure =1.01xx10^(5)N//m^(2) .

State the kind of energy (potential or kinetic or both) in case of following : (a) Stone resting on the top of a hill. (b) An arrow shooting from a stretched bow and arrow system. (c) A flying mosquito (d) A wound-up spring of a toy car (e) A speeding car (f) A bullet fired from a gun.

In Figure, draw a tackle to lift the load by applying the force in downward direction. (a) Mark in the diagram the direction of load L and effort E. (b) If the load is raised by 1 m, through what distance will the effot move ? (c) State the number of strands of tackle supporting the load. (d) What is the mechanical advantage of the system?