0
question_answer1) Define rate of a chemical reaction.
question_answer2) What is effective collision?
question_answer3) In what condition order and molecularity of a reaction become equal?
question_answer4) Define rate law.
question_answer5) Draw a graph between concentration and time for a zero order reaction.
question_answer6) What is collision frequency?
question_answer7) What is average rate of reaction?
question_answer8) What do you mean by rate determining step?
question_answer9) Draw a graph between and time for a first order reaction.
question_answer10) Give the unit of rate constant of a reaction.
question_answer11) What is instantaneous rate of reaction?
question_answer12) In which type of reaction order and molecularity are different?
question_answer13) What is rate constant?
question_answer14) What is half life period of a reaction?
question_answer15) Name the two barriers for a chemical reaction to occur.
question_answer16) Define molecularity of a reaction.
question_answer17) Draw a graph between log10[R] and t for a first order reaction.
question_answer18) Write units of rate of reaction.
question_answer19) What is order of reaction?
question_answer20) What is zero order reaction?
question_answer21) Write expression for rate constant of a zero order reaction and explain the terms involved. What is the unit of rate constant of a zero order reaction?
question_answer22) What is pseudo first order reaction? Give an example.
question_answer23) What is catalyst? What is the effect of catalyst on the rate of a reaction?
question_answer24) Mention the necessary condition for collision of reaction molecules to give product.
question_answer25) What is average rate of reaction? How is it determined?
question_answer26) Prove that half life period of a zero order reaction is directly proportional to initial concentration of the reactant.
question_answer27) What is activation energy? How is it calculated?
question_answer28) What is instantaneous rate of reaction? How is it determined?
question_answer29) How does a catalyst increase the rate of a reaction?
question_answer30) What is the effect of temperature on the reaction rate?
question_answer31) Define first order reaction with one suitable example.
question_answer32) Mention differences between order and molecularity of a reaction.
question_answer33) What is intermediate complex theory of catalysis?
question_answer34) Show that half life period of a first order reaction is independent of initial concentration of the reactant.
question_answer35) What is zero order reaction? Give one example of zero order reaction.
question_answer36) Write Arrhenius equation and explain the terms involved.
question_answer37) Write expression for rate constant of first order reaction. Mention unit of rate constant of a first order reaction.
question_answer38) Draw a graph between log10k and 1 / T of a reaction.
question_answer39) What is the drawback of collision theory?
question_answer40) What are the limitations of a catalyst?
question_answer41) Catalyst does not affect the equilibrium rather helps in quick attainment of equilibrium. Explain this statement.
question_answer42) Why rate of reaction increases with rise in temperature?
question_answer43) Reaction having molecularity greater than three is not observed. Explain.
question_answer44) A balloon with mass M is descending down with an acceleration a(< g). What mass m of its contents must be removed so that it starts moving up with an acceleration a?
question_answer45) A batsman deflects a ball by an angle of \[{{45}^{o}}\] without changing its initial speed which is equal to\[\text{54 km }{{\text{h}}^{-1}}\]. What is the impulse imparted to the ball? Mass of the ball is 0-15 kg.
question_answer46) A constant force F = 20 N acts on a block of mass 2 kg which is connected to two blocks of masses \[{{m}_{1}}=1.0kg\]and \[{{m}_{2}}=2kg\]as shown in Fig.3(HT)3. Calculate the accelerations produced in all the three blocks. Assume pulleys are frictionless and weightless.
question_answer47) Two wooden blocks of masses 1 kg and 2 kg are separated by a certain distance. A bullet of mass 50 g fired from a gun pierces through the block of mass 1 kg and then stopped in the second block. After the impact of the bullet, both blocks start moving with the same speed. Calculate the percentage loss in the initial velocity of the bullet when it is in between the two blocks.
question_answer48) A very flexible uniform chain of mass M and length L is suspended vertically so that its lower end just touches the surface of a table. When the upper end of the chain is released, it falls with each link coming to rest the instant it strikes the table. Find the force exerted by the chain on the table at the moment when x part of chain has already rested on the table.
question_answer49) Assuming the length of a chain to be L and coefficient of static friction\[\mu \], calculate the maximum length of the chain which can be held outside a table without sliding?
question_answer50) A body of mass \[\text{5}\times \text{1}{{0}^{-3}}\text{kg}\] is launched upon a rough inclined plane making an angle of \[\text{3}{{0}^{O}}\]with the horizontal. Obtain the coefficient of friction between the body and the plane if the time of ascent is half the time of descent.
question_answer51) A wire of mass \[\text{9}\text{.8}\times \text{l}{{0}^{-3}}\text{kg}\] per meter passes over a frictionless pulley fixed on the top of an inclined frictionless plane which makes an angle of \[\text{3}0{}^\circ \] with the horizontal. Masses \[{{M}_{1}}\] and \[{{M}_{2}}\] are tied at the two ends of the wire. The mass\[{{M}_{1}}\] rests on the plane and the mass \[{{M}_{2}}\] hangs freely vertically downward. The whole system is in equilibirum. Now a transverse wave1 propagates along the wire with a velocity of 100 m/s. Find \[{{M}_{1}}\] and \[{{M}_{2}}\] (\[\text{g}=\text{9}\text{.8 m}/{{\text{s}}^{\text{2}}}\]).
question_answer52) A hemispherical bowl of radius R is set rotating about its axis of symmetry which is kept vertical. A small block kept in the bowl rotates with the bowl without slipping on its surface. If the surface of the bowl is smooth, and the angle made by the radius through the block with the vertical is \[\theta \], find the angular speed at which the bowl is rotating.
question_answer53) A railway engine weighing 40 metric ton is travelling along a level track at a speed of 54 km/h. What additional power is required to maintain the same speed up an incline rising 1 in 49, given \[\mu =0.1\], \[g=9.8m{{s}^{-2}}\].
question_answer54) Calculate the height upto which an insect can crawl up a fixed bowl in the form of a hemisphere of radius r. Given coefficient of friction is \[1/\sqrt{3}\].
question_answer55) A 4 metre long ladder weighing 25 kg rests with its upper end against a smooth wall and lower end on rough ground. What should be the minimum coefficient of friction between the ground and the ladder for it to be inclined at \[\text{6}0{}^\circ \] with the horizontal without slipping? Take\[\text{g}=\text{1}0\text{ m}{{\text{s}}^{\text{-2}}}\].
question_answer56) A boy of 30 kg weight sitting on a horse whips it The horse speeds up at an average acceleration of\[\text{2 m}/{{\text{s}}^{\text{2}}}\]. (a) If the boy does not slide back, what is the force of friction exerted by the horse on the boy? (b) If the boy slides back during the acceleration, what can be, said about tee coefficient of static friction between the horse and the boy? Take \[\text{g}=10\text{m}/{{\text{s}}^{\text{2}}}\].
question_answer57) A block placed on a horizontal surface is being pushed by a force F making an angle \[\theta \]with the vertical. If the friction coefficient is u, how much force is needed to get the block just started. Discuss the situation when \[\tan \theta <\mu \], Fig. 3(HT).13.
question_answer58) An explosion blows a rock into three pieces. Two pieces whose masses are 200 kg and 100 kg go off at right angles to each other with a velocity of 8 m/s and 12 m/s respectively. If the third piece flies off with a velocity of 25 m/s, then calculate the mass of this piece and indicate the direction of flight of this piece in a diagram.
question_answer59) Two bodies of masses M and m are allowed to fall freely from the .same height. If air resistance for each body is same, then will both the bodies reach the earth simultaneously?
question_answer60) A soda water bottle is falling freely. Will the bubbles of the gas rise in the water of the bottle?
question_answer61) Air is thrown on a sail attached to a boat from an electric fan placed on the boat Will the boat start moving?
question_answer62) A bird is sitting on the floor of a wire cage and the cage is in the hand of a boy. The bird starts flying in the cage. Will the boy experience any change in the weight of the cage?
question_answer63) A bird is sitting on the floor of a closed glass cage and the cage is in the hand of a girl. Will the girl experience any change in the weight of the cage when the bird (i) starts flying in the cage with a constant velocity (ii) flies upwards with acceleration (iii) flies downwards with acceleration?
question_answer64) When a ball is thrown upwards, its momentum first decreases and then increases. Is conservation of linear momentum violated in this process?
question_answer65) Why are wheels of an automobile made circular?
question_answer66) Automobile tyres are generally provided with irregular projections over their surfaces, why?
question_answer67) Why is it difficult to climb up a greasy pole?
question_answer68) Why frictional force gets increased when two surfaces in contact are polished beyond a certain limit?
question_answer69) The driver of a truck travelling with a velocity v suddenly notices a brick wall in front of him at a distance d. It is better for him to apply brakes or to make a circular turn without applying brakes in order to just avoid crashing into the wall? Why?
question_answer70) What is the maximum possible velocity at lowest position for oscillation of a simple pendulum of length L? What can happen to the motion if the velocity exceeds this value?
question_answer71) A particle moves in circle of radius 20cm. Its linear speed is given by \[\upsilon =2t\]where t is in second and in metre/second. Find the radial and tangential acceleration at \[t=3s\].
question_answer72) If the net force acting on a body be zero, then will the body remain necessarily in rest position?
question_answer73) The distance travelled by a moving body is directly proportional to time. Is any external force acting on it?
question_answer74) Can a body remain in rest position when external forces are acting on it?
question_answer75) A person sitting in the compartment of a train moving with uniform speed throws a ball in the upward direction. What path of the ball will appear to him? What to a person standing outside?
question_answer76) If force is acting on a moving body perpendicular to the direction of motion, then what will be its effect on the speed and direction of the body?
question_answer77) A retarding force is applied to stop a motor car. H the speed of the motor car is doubled, how much more distance will it cover before stopping under the same retarding force?
question_answer78) A body is dropped from the ceiling of a transparent cabin falling freely towards the earth. Describe the motion of the body as observed by an observer (a) sitting in the cabin, (b) standing on earth.
question_answer79) The linear momentum of a body can change only in the direction of applied force. Comment
question_answer80) A force is always required to move a body uniformly. Comment.
question_answer81) Calculate the net force acting on a body of mass 10 kg moving with a uniform velocity of\[\text{2 m}{{\text{s}}^{\text{-1}}}\].
question_answer82) Calculate the mass of a body weighing 100 dyne. Take \[\text{g}=\text{1}0\text{ m}{{\text{s}}^{\text{-2}}}\].
question_answer83) On what factors does the thrust on a rocket depend?
question_answer84) Calculate the force acting on a body whose linear momentum changes by \[\text{2}0\text{ kg m}{{\text{s}}^{\text{-1}}}\] in 10 s.
question_answer85) The length of an ideal spring increases by 0-1 cm when a body of 1 kg is suspended from it. If this spring is laid on a frictionless horizontal table and bodies of 1 kg each are suspended from its ends, then what will be the increase in its length?
question_answer86) The two ends of a spring-balance are pulled each by a force of 10 kg. wt. What will be the reading of the balance?
question_answer87) A lift is accelerated upward. Will the apparent weight of a person inside the lift increase, decrease or remain the same relative to its real weight? If the lift is going with uniform speed, then?
question_answer88) A ball of 0-5 kg mass moving with a speed of 10 m/s rebounds after striking normally a perfectly elastic wall. Find the change in momentum of the ball.
question_answer89) A body of 2 kg is suspended on a spring balance hung vertically in a lift. If the lift is falling downward under acceleration due to gravity g, then what will be the reading of the balance? If going upward with the same acceleration, then?
question_answer90) A 5-kg body is suspended from a spring-balance, and an identical body is balanced on a pan of a physical balance. If both the balances are kept in an elevator, then what would happen in each case when the elevator is moving with an upward acceleration?
question_answer91) A thief jumps from the roof of a house with a box of weight W on his head. What will be the weight of the box as experienced by the thief during jump?
question_answer92) Action and reaction forces do not balance each other. Why?
question_answer93) What is the principle of working of a rocket?
question_answer94) Why does a gun recoil when a bullet is fired?
question_answer95) An impulsive force of 100 N acts on a body for 1 s. What is the change in its linear momentum?
question_answer96) Sand is thrown on the tracks covered with snow. Why?
question_answer97) Why do we easily slip on a rainy day?
question_answer98) Why is it easier to maintain the motion than to start it?
question_answer99) What are the factors on which coefficient of friction depends?
question_answer100) What happens to coefficient of friction, when weight of body is doubled?
question_answer101) Which is greatest out of static friction, limiting friction and dynamic friction?
question_answer102) Why are wheels circular?
question_answer103) What type of friction is involved when an axle rotates in a sleeve?
question_answer104) Is friction independent of actual area of contact?
question_answer105) The fast moving vehicles are given streamline shape. Why?
question_answer106) Rubber tyres are preferred to steel tyres. Why?
question_answer107) What is the relation between coefficient of friction and angle of repose?
question_answer108) Is friction a self adjusting force?
question_answer109) What is the angle between frictional force and instantaneous velocity of the body moving over a rough surface?
question_answer110) Can we get off a frictionless horizontal surface by jumping?
question_answer111) What is the angle of friction between two surfaces in contact, if coefficient of friction is 1/\[\sqrt{3}\]?
question_answer112) It is easier to revolve a stone by attaching it to a shorter string rather than to a longer one. Why?
question_answer113) A bucket of water is rotated in a vertical circle so that the surface of water is at a distance r from the axis of rotation. What is the minimum angular velocity so that the water does not spill out?
question_answer114) What is the apparent weight of a body of mass m at (a) the highest and (b) lowest point if it is just 'looping the loop' in a vertical circle?
question_answer115) The acceleration of a train travelling at 40m/s as it goes round a curve of 160 m in radius is........
question_answer116) A ball of 1 gm released down an inclined plane describes a circle of radius 10 cm in the vertical plane on reaching the bottom. The minimum height of the inclined plane is.........cm.
question_answer117) A stone is tied to one end of a string and rotated in a vertical circle. What is the difference in tensions of the string at lowest and highest points of the vertical circle?
question_answer118) Heavier bodies need greater initial effort to put them in motion. Why?
question_answer119) A part of Newton's first law states that a body continues to move uniformly in the absence of an external force appears contradictory. Comment
question_answer120) Four blocks of the same mass m connected by cords are pulled by a force F on a smooth horizontal surface,, as shown in Fig. 3(a).23. Determine the tensions \[{{T}_{1}}\], \[{{T}_{2}}\] and \[{{T}_{3}}\] in the cords.
question_answer121) The speed of driving a car safely in darkness depends upon the range of headlights. Explain.
question_answer122) A force of 5 N changes the velocity of a body from \[\text{1}0\text{ m}{{\text{s}}^{\text{-1}}}\] to \[\text{2}0\text{ m}{{\text{s}}^{\text{-1}}}\]in 5 sec. How much force is required to bring about the same change in 2 sec?
question_answer123) Earth is a rotating frame of reference, even then it is considered as inertial frame of reference for all practical purposes. Why?
question_answer124) Vehicles stop on applying brakes. Does this phenomenon violate the principle of conservation of momentum?
question_answer125) Three identical blocks, each having a mass M, are pushed by a force F on a frictionless table as shown in Fig 3(a).2S. What is the acceleration of the blocks? What is the net force on the block A? What force does A apply on B? What force does B apply on C? Show action-reaction pairs on the contact surfaces of the blocks.
question_answer126) A bullet fired from a gun is more dangerous than an air molecule hitting a person, though both of them have almost the same speed. Why?
question_answer127) Rocket can move in air free space, but jet planes cannot. Why?
question_answer128) Carts with rubber tyres are easier to ply than those with iron wheels.
question_answer129) Why is it difficult to move a bike with its brakes on?
question_answer130) Sand is spread on tracks covered with snow. Why?
question_answer131) When a wheel is rolling on a level road, what is the direction of frictional force between the wheel and the road?
question_answer132) Is large brake on a bicycle wheel more effective than a small one? Explain.
question_answer133) How do we save petrol when the tyres of the motor cycle are fully inflated?
question_answer134) A block of mass 1 kg lies on horizontal surface in a truck. The coefficient of static friction between the block and the surface is 0.6. If the acceleration of the block is \[5\,m{{s}^{-2}}\], calculate the frictional force acting on the block.
question_answer135) A block is gently placed at the top of an inclined plane 6.4m long. Find the time taken by the block to slide down to the bottom of the plane. The plane makes an angle\[{{30}^{\text{o}}}\] with the horizontal. Coefficient of friction between the block and the plane is 0.2. Take \[g=10\,m/{{s}^{2}}\].
question_answer136) How does a lubricant help in reducing friction?
question_answer137) How does banking of roads reduce wear and tear of the tyres?
question_answer138) Why has a horse to pull a cart harder during the first few steps of his motion?
question_answer139) Why does a cyclist lean to one side, while going along a curve? In what direction does he lean?
question_answer140) A stone tied to one end of a string is whirled in a circle. If the string breaks, the stone flies off tangentially. Why?
question_answer141) For uniform circular motion, does the direction of the centripetal force depend upon the sense of rotation?
question_answer142) Why does a child in a merry-go-round press the side of his seat radially outward?
question_answer143) What is the source of centripetal force, when an electron revolves around the nucleus?
question_answer144) A bucket containing water is rotated in a vertical circle. Explain why water does not fall.
question_answer145) Why does a pilot not fall down, when his aeroplane loops a vertical loop?
question_answer146) One often comes across the following kind of statement concerning circular motion. 'A particle moving uniformly along a circle experiences a force directed towards the centre and an equal and opposite force directed away from the centre. The two forces together keep the particle in equilibrium'. Explain, what is wrong with the statement?
Please Wait you are being redirected....
You need to login to perform this action.You will be redirected in 3 sec
OTP has been sent to your mobile number and is valid for one hour
Your mobile number is verified.