[{"id":252740,"question":"A man pushes a wall and fails to displace it. He does:","choices":[{"text":"Negative work","value":"A"},{"text":"Positive but not maximum work","value":"B"},{"text":"No work at all","value":"C"},{"text":"Maximum work","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252739,"question":"A body is dropped from a height of 20 m and rebounds to a height of 10 m. the loss of energy is:","choices":[{"text":"10%","value":"A"},{"text":"45%","value":"B"},{"text":"50%","value":"C"},{"text":"75%","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252738,"question":"The gravity does no work, when the body moves:","choices":[{"text":"Horizontally","value":"A"},{"text":"Vertically upwards","value":"B"},{"text":"Vertically downward","value":"C"},{"text":"At an angle of 45o with horizontal","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252737,"question":"A person weighing 20 mg walks on a level platform with a speed of 2 ms-1\r\n. The work by the person against the\r\nforce of gravity is:","choices":[{"text":"Zero","value":"A"},{"text":"2J","value":"B"},{"text":"60J","value":"C"},{"text":"600J","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252736,"question":"Ratio of dimension of K.E and power is:","choices":[{"text":"1:1","value":"A"},{"text":"T:1","value":"B"},{"text":"1:T","value":"C"},{"text":"M:J","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":252735,"question":"A body of mass 3 Kg lies on the surface on the table 2m high. It is moved on the surface by 4m. The change of\r\nP.E will be:","choices":[{"text":"Zero","value":"A"},{"text":"9.8 J","value":"B"},{"text":"19.6 J","value":"C"},{"text":"329 J","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252734,"question":"Which of the following types of force can do no work on the particle on which it acts?","choices":[{"text":"Frictional force","value":"A"},{"text":"Gravitational force","value":"B"},{"text":"Elastic force","value":"C"},{"text":"Centripetal force","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252733,"question":"The momentum of a particle is numerically equal to its K.E. What is the velocity of a particle?","choices":[{"text":"9 ms<sup>-1</sup>","value":"A"},{"text":"3 ms<sup>-1</sup>","value":"B"},{"text":"2 ms-1","value":"C"},{"text":"1 ms<sup>-1</sup>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252732,"question":"When the velocity of a body is doubled:","choices":[{"text":"Its K.E is doubled","value":"A"},{"text":"Its P.E is doubled","value":"B"},{"text":"Its momentum is doubled","value":"C"},{"text":"Its acceleration is doubled","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252723,"question":"If velocity time graph is a straight line parallel to time axis then body is","choices":[{"text":"Moving with zero acceleration","value":"A"},{"text":"Moving with constant velocity","value":"B"},{"text":"Covering equal displacement in equal intervals of time","value":"C"},{"text":"All of these","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252721,"question":"At the highest point on the trajectory of a projectile, its","choices":[{"text":"Potential energy is minimum","value":"A"},{"text":"Kinetic energy is maximum","value":"B"},{"text":"Total energy is maximum","value":"C"},{"text":"Kinetic energy is minimum","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252720,"question":"Two bodies are projected at angles  and (90°–) with the horizontal at the same speed.The ratio of their\r\nmaximum heights is","choices":[{"text":"1 : 1","value":"A"},{"text":"1 : tan ","value":"B"},{"text":"1 : tan ","value":"C"},{"text":"tan<sup>2</sup> : 1","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252719,"question":"Speedometer of an automobile measures","choices":[{"text":"Average velocity","value":"A"},{"text":"Instantaneous velocity","value":"B"},{"text":"Acceleration","value":"C"},{"text":"Instantaneous speed","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252718,"question":"If a body changes its momentum from 100 N s to 200 N s in 10 s then the unbalanceexternal\r\nforce responsible to change the momentum is","choices":[{"text":"5 N","value":"A"},{"text":"2.5 N","value":"B"},{"text":"2n","value":"C"},{"text":"10n","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252717,"question":"Swimming is possible on account of","choices":[{"text":"1<sup>st</sup> law of motion","value":"A"},{"text":"2<sup>nd</sup> law of motion","value":"B"},{"text":"3<sup>rd</sup> law of motion","value":"C"},{"text":"Newton’s law of Gravitation","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252714,"question":"The angle of projection, at which the range of projectile would become half of its\r\nmaximum value.","choices":[{"text":"45Degree","value":"A"},{"text":"30Degree","value":"B"},{"text":"15Degree","value":"C"},{"text":"60 Degree","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252712,"question":". Time rate of change of momentum is equal to","choices":[{"text":"Force","value":"A"},{"text":"Impulse","value":"B"},{"text":"Velocity","value":"C"},{"text":"Both A and C","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252707,"question":"select Which one of the following is not performing projectile motion","choices":[{"text":"A gas filled balloon","value":"A"},{"text":") Bullet fired from gun","value":"B"},{"text":"A football kicked","value":"C"},{"text":"A baseball shot","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252704,"question":"A rider uses Motorcycle safety helmet that extends the time of collision during accident hence\r\ndecreasing the","choices":[{"text":"Change of collisio","value":"A"},{"text":"Force acting","value":"B"},{"text":"Velocity","value":"C"},{"text":"Impulse","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":252701,"question":"A boy is travelling from Lahore to Karachi with uniform velocity . Its","choices":[{"text":"Speed changes","value":"A"},{"text":"Acceleration changes","value":"B"},{"text":"Direction of motion changes","value":"C"},{"text":"Displacement from origin changes","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252699,"question":"A man has weight 980 N in a stationary lift. What will be his weight if the lift starts\r\nmoving up with anacceleration of 4.9 ms<sup>-2</sup>","choices":[{"text":"980 N","value":"A"},{"text":"1470 N","value":"B"},{"text":"1980 N","value":"C"},{"text":"1460 N","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252698,"question":"A monkey is accelerating down a string whose breaking strength is two third of his\r\nweight. The minimumacceleration of the monkey should be","choices":[{"text":"1/3g","value":"A"},{"text":"g","value":"B"},{"text":"2/3 g ","value":"C"},{"text":"0 m/s2","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252693,"question":"Two astronauts in a satellite must have","choices":[{"text":"Same masses","value":"A"},{"text":"Same real weights","value":"B"},{"text":"Same apparent weights ","value":"C"},{"text":"None of these","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252691,"question":"The angular momentum of a body changes from 30 J-S to 50 J-S in 0.5 sec. The torque acting\r\non it is","choices":[{"text":"40 N-m","value":"A"},{"text":"100 N-m","value":"B"},{"text":"50 N-m","value":"C"},{"text":"150 N-m","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252690,"question":"As in linear motion force determines linear acceleration where as in circular motion torque\r\ndetermines its","choices":[{"text":"Angular acceleration","value":"A"},{"text":"Linear acceleration","value":"B"},{"text":"Vibratory acceleration","value":"C"},{"text":"Tangential acceleration","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252688,"question":"A body is in translational equilibrium if","choices":[{"text":"P = 0","value":"A"},{"text":"L = 0","value":"B"},{"text":"F = 0","value":"C"},{"text":" = 0","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252686,"question":"The centre of gravity of a triangular plate is at","choices":[{"text":"On end of the plate","value":"A"},{"text":"The midpoint of any side of the plate","value":"B"},{"text":"The midpoint of any side of the plate","value":"C"},{"text":"The midpoint of any side of the plate","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252683,"question":"Two railway trucks of masses m and 3m move towards each other in opposite directions with speeds 2v and\r\nv respectively. These trucks collide and stick together.\r\nWhat is the speed of the trucks after the collision?","choices":[{"text":"<i>v/4</i>","value":"A"},{"text":"<i>v/2</i>","value":"B"},{"text":"<i>v</i>","value":"C"},{"text":"<i>5v/4</i>","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252680,"question":"The rate of change of momentum of a body falling freely under gravity is equal to its","choices":[{"text":"Impulse","value":"A"},{"text":"Kinetic energy","value":"B"},{"text":"Pover","value":"C"},{"text":"Weight","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252677,"question":"Two 8 N forces act on each end of the beam of length 0.60m. Two forces are parallel and acting opposite to\r\neach other, the angle between the force and beam is 60o\r\n, what is the torque of the couple exerted on the\r\nbeam:","choices":[{"text":"2.4 Nm","value":"A"},{"text":"4.2 Nm","value":"B"},{"text":"4.8 Nm","value":"C"},{"text":"9.6 Nm","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":252672,"question":"A rigid uniform bar of length 2.4 m is pivoted horizontally at its mid-point, weights are hung from two points\r\nof the bar as shown in diagram. To maintain horizontal equilibrium, a couple is applied to the bar:\r\nWhat is the torque and the direction of couple?","choices":[{"text":"40 N m clockwise","value":"A"},{"text":"40 N m anti-clockwise","value":"B"},{"text":"80 N m clockwise","value":"C"},{"text":"80 N m anti-clockwise","value":"D"},{"value":"E"}],"correctAnswer":2},{"id":252669,"question":"What is the resultant force in the diagram shown?","choices":[{"text":"Zero","value":"A"},{"text":"6N to left","value":"B"},{"text":"6N to right","value":"C"},{"text":"11N to right","value":"D"},{"value":"E"}],"correctAnswer":1},{"id":252665,"question":"In a one-dimensional elastic collision, the relative velocity of approach before collision is equal to:","choices":[{"text":"Sum of the velocities of the bodies","value":"A"},{"text":"e times the relative velocity of separation after collision","value":"B"},{"text":"1⁄𝑒 times the relative velocity of separation after collision","value":"C"},{"text":"relative velocity of separation after collision","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252662,"question":"A body of mass m having an initial velocity v, makes head on elastic collision with a stationary body of mass\r\nm. After the collision, the body of mass m comes to rest and only the body having mass M moves. This will\r\nhappen only when:","choices":[{"text":"m&gt;&gt;M","value":"A"},{"text":"m&lt;&lt;M","value":"B"},{"text":") m=M","value":"C"},{"text":"m=1M","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252659,"question":"The time of flight of a projectile is maximum when angle of projection is:","choices":[{"text":"30 Degree","value":"A"},{"text":"45Degree","value":"B"},{"text":"60Degree","value":"C"},{"text":"90Degree","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252657,"question":"A stone is thrown upwards it returns to ground describing a parabolic path which of the following remains\r\nconstant:","choices":[{"text":"Speed of the ball","value":"A"},{"text":"Kinetic energy of the ball","value":"B"},{"text":"Vertical component of velocity","value":"C"},{"text":") Horizontal component of velocity","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252653,"question":"Two bodies are projected at angle 𝜽 𝒂𝒏𝒅 (𝟗𝟎 − 𝜽) to the horizontal with the same speed. The ratio of their\r\ntimes of flight is:","choices":[{"text":"sin 𝜃 : 1","value":"A"},{"text":"cos 𝜃 : 1","value":"B"},{"text":"sin 𝜃 : cos𝜃","value":"C"},{"text":"cos 𝜃 : sin𝜃","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252652,"question":"Newton’s third law concerns the forces of interaction between two bodies. Which of the following statement\r\nrelating to the third law is not correct:","choices":[{"text":" The two forces must be the same type","value":"A"},{"text":"The two forces must act on different bodies","value":"B"},{"text":"The two forces are always opposite in direction","value":"C"},{"text":"The two forces are equal and opposite so the bodies are in equilibrium","value":"D"},{"value":"E"}],"correctAnswer":4},{"id":252651,"question":"Vertical component of velocity of the projectile at any instant ‘t’ from the ground is given by:","choices":[{"text":"𝑣𝑖𝑐𝑜𝑠𝜃","value":"A"},{"text":"𝑣𝑖𝑐𝑜𝑠𝜃 − 𝑔<i>t</i>","value":"B"},{"text":"𝑣𝑖𝑠𝑖𝑛𝜃 − 𝑔<i>t</i>","value":"C"},{"text":"𝑣𝑖𝑠𝑖𝑛𝜃 + 𝑔<i>t</i>","value":"D"},{"value":"E"}],"correctAnswer":3},{"id":252650,"question":"If the range of a projectile is R, the potential energy will be maximum after the projectile has covered (from\r\nstart) distance equal to:","choices":[{"text":"<i>R/2</i>","value":"A"},{"text":"<i>R/4</i>","value":"B"},{"text":"<i>R</i>","value":"C"},{"text":"<i>R/9</i>","value":"D"},{"value":"E"}],"correctAnswer":1}]