Practice Test

Q1) Inertia is the inherent property of the body and depends upon its Show Answer

Q2) Which of the following types does not correspond to the inertia of a body ? Show Answer

Q3) The quantity of motion contained in the body is called its Show Answer

Q4) The SI unit of linear momentum of a body is Show Answer

Q5) Th dimensional formula for the rate of change of linear momentum is given by Show Answer

Q6) Newton's third law of motion is applicable Show Answer

Q7) The action and reaction Show Answer

Q8) Which of the following is not an obvious conclusion from Newton's second law of motion ? Show Answer

Q9) A body is acted upon by a constant force, then it will have a uniform Show Answer

Q10) The ratio of SI unit to cgs unit of force is Show Answer

Q11) A man of mass 80 kg is standing in an elevator whose cable breaks suddenly. if the elevator falls, the apparent weight of the man is Show Answer

Q12) The weight of a body cannot be measured in Show Answer

Q13) A 100 kg person goes around the earth in a satellite. In the satellite, his weight will be Show Answer

Q14) A man in a lift will weight more, when Show Answer

Q15) When a force of 1 N acts on a body of mass 1g, the body receives an acceleration of Show Answer

Q16) A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m, when force F is applied at one end of the rope. Then the force which the rope exerts on the block is Show Answer

Q17) A car accelerator on a horizontal road due to the force exerted by the Show Answer

Q18) Inertia of a body has direct dependence on its Show Answer

Q19) A person is at rest in the middle of a block of smooth ice. Then he can get to the shore by making use of Newton's Show Answer

Q20) There are three Newton's laws of motion, namely first, second and third laws. We can derive Show Answer

Q21) When a horse pulls a cart, the force which helps the horse to move forward is the force exerted by Show Answer

Q22) The ratio of SI units to c.g.s. units of weight of a body is Show Answer

Q23) A force of 10 N acts on a body of weight 9.8 N. What is the acceleration produced ? Show Answer

Q24) A constant force acts on a body of mass m at rest. The velocity v acquired in transversing a specific distance depends on m as Show Answer

Q25) An object of mass M is thrown vertically upwards. At what rate will its momentum change ? Show Answer

Q26) A machine gun fires n bullet per second and the mass of each bullet is m. If v is the speed of each bullet then force exerted on the machine gun is Show Answer

Q27) Two trains P and Q are running in the same direction on parallel tracks such that P is faster than Q. When packets of equal weights are exchanged between the two, then Show Answer

Q28) A lead ball and another rubber ball having same mass, strike normally on a smooth vertical wall with the same velocity. The lead ball falls down after striking but the rubber ball bounced back. Then the Show Answer

Q29) A person of weight mg is moving upwards in a rocket with an acceleration of 4g. His apparent weight inside the rocket will be Show Answer

Q30) A stationary bomb explodes into two parts of masses 3 kg and kg. The total kinetic energy Show Answer

Q31) A stationary bomb explodes into two parts of masses 3 kg and 1 kg. The total kinetic energy of the two parts after the explosion in 2400 J. Then the K.E. of the smaller part is Show Answer

Q32) Two particles initially at rest move towards each other under the mutual attraction. At the instant when the speed of P is v and the speed of Q is 2v, the speed of the centre of mass of the system will be Show Answer

Q33) Two stones of equal mass rest on the pans of an equal arms balance in a lift. Will they remain balanced when the lift accelerates upwards ? Show Answer

Q34) A rocket works on the principle of Show Answer

Q35) A 100 kg person goes around the earth in a satellite. Inside the satellite, his weight will be Show Answer

Q36) A stretching force of 9.8 N is applied at one end of a spring balance and an equal stretching force is applied at the other end at the same time. The reading on the spring balance will be Show Answer

Q37) On a stationary sail boat, air is blown at the sails from a fan attached to the boat. The boat will Show Answer

Q38) The electrostatic and gravitational forces are similar because both Show Answer

Q39) In a tug of war, two opposite teams are pulling the rope with an equal and opposite force of 1000 N at each end of the rope, so that condition of equilibrium exists. What is the tension in the rope ? Show Answer

Q40) If N, G and E represent the magnitudes of nuclear, gravitational and electromagnetic forces respectively between two electrons at a given separation, then Show Answer

Q41) Which of the following results in a self adjusting force ? Show Answer

Q42) A boy lifted a box of weight W and while carrying it on his head jumped down from a wall of height H from the ground. Before he reached the ground, he experienced a load of Show Answer

Q43) Assertion :
Moment of inertia is same as inertia.
Reason :
Moment of inertia of a body represents rotational inertia of the body. Show Answer

Q44) Assertion :
Pulling a lawn roller is easier than pushing it.
Reason :
Pushing increases the apparent weight and hence the force of friction. Show Answer

Q45) Assertion :
A body falling freely under gravity becomes weightless.
Reason :
R = m(g - a)
= m (g - g)
= 0 Show Answer

Q46) Assertion :
Inertia mass and gravitational mass are equivalent.
Reason :
Both represent basically the quantity of matter in the body. Show Answer

Q47) Assertion :
A rocket works on the principle of conservation of linear momentum.
Reason :
Higher the velocity, smaller is the pressure and vice versa. Show Answer

Q48) Dimensions of electromotive force are Show Answer

Q49) The dimensions of coefficient of viscosity is Show Answer

Q50) A vehicle covers the first half distance between two points at a speed of 30 km/h and second half at the speed of 20 km/h. The average speed in (km/h) of the vehicle will be Show Answer

Q51) A man walks 4 km towards north in one hour and 3 km towards east in the next hour. His average velocity is Show Answer

Q52) Two ends of a train moving with constant acceleration pass a certain point with velocity u and v. The velocity with which the middle point of the train passes the same point. Show Answer

Q53) A body has a mass of 50 kg. Its velocity is brought down from 20 m/s to 5 m/s by a resisting force in 5 s. The magnitude of resisting force is Show Answer

Q54) From the top of tree h metre high, a body A is dropped and another body B is projected horizontally with the velocity of u m/s. Then, Show Answer

Q55) Assertion (A): A cricket player lowers his hands to catch a falling ball.
Reason (R): The rate of change of momentum of ball is reduced in the process. Show Answer

Q56) A rocket works on the principle of conservation of Show Answer

Q57) In a system of units, the value of acceleration due to gravity is 1 and the unit of time is one second in this system. The length would be Show Answer

Q58) A ball of 50 g is dropped vertically downwards from the top of a 5 m high tower. If the ball hits ground and bounces back without any loss of energy, then the impulse of force exerted on the ground in one second will be Show Answer

Q59) A rifle with muzzle velocity of 1500 m/s shoots a bullet at a small target 150 m away. How high above the target must the rifle be aimed so that bullet hits the target ? Show Answer

Q60) A mass of 2 kg is whirled in a circle in a horizontal plane, at an initial speed of 5 revolutions per min. Keeping the radius constant, the speed is increased so that the centripetal force is four times the initial value. The ratio of the final speed to initial speed is Show Answer

Q61) A man is standing on a weighing machine in a lift which is moving. The weighing machine will show minimum reading when the lift is moving Show Answer

Q62) Assertion (A): While taking a sharp turn at high speed a truckload of folder overturns more frequently than a truckload of iron beams.
Reason (R): The centre of gravity of a truck carrying folder is lowered and the vertical line through its CG falls outside the base on a sharp turn, while for a truck carrying iron beams this does not happen. Show Answer

Q63) The minimum force needed to move a piano of 1000 N weight on a horizontal surface is 350 N. The coefficient of friction is Show Answer

Q64) Two persons pull at the two ends of a rope, each with a force of 50 kg-wt. The tension in the rope is Show Answer

Q65) A body of mass 6 kg is rotated in circle of radius 3m with a uniform speed of 10 m/s, the force which must act on the body to maintain the motion is Show Answer

Q66) The force F acting on a body moving in a circle of radius r is always perpendicular to the velocity v. The work done by the force on the body is Show Answer

Q67) The resultant of two forces, each of magnitude P, is also a force of magnitude P. The angle between the two given forces is Show Answer

Q68) A man weighing mg in a rocket moves up with acceleration 4 g. His weight in rocket is (in all) Show Answer

Q69) Physical independence of force is a consequence of Show Answer

Q70) The vectors A, B, C and D represent the forces acting on a body. Which one of the following figures indicate that the body is in equilibrium ? Show Answer

Q71) A ball with an initial momentum p collides normally with a rigid wall. If p' is its linear momentum after the perfectly elastic collision, then
Show Answer

Q72) A body of mass 2 kg is moving with a constant velocity of 20 cm/s for 4 s. The force acting on the body is
Show Answer

Q73) A unloaded car moving with velocity u on a frictionless road can be stopped in a distance s. If the passenger add 40% to its weight and breaking force remains the same, the stopping distance at velocity u is now
Show Answer

Q74) A bullet of mass 10 g is fired from a gun of mass 1 kg which recoils with velocity of 5 gun 5 m/s. Then, muzzle velocity will be
Show Answer

Q75) A bullet weighing 5g moving with a velocity 600 m/s strikes a 5 kg block of ice resting on a frictionless surface. The speed of the block after the collision is
Show Answer

Q76) A uniform chain of length L and mass M is lying on a smooth table and one-third of its length is hanging vertically down over the edge of the table. If g is acceleration due to gravity, the work required to pull the hanging part on the table is
Show Answer

Q77) At a curved part of the road bed is raised little on the side away from the centre of the curve path. The slope of the road bed is given by
Show Answer

Q78) In a circus a rider rides in a circular track of radius in a vertical plane. The minimum velocity at higher point of track will be
Show Answer

Q79) A motor cyclist rides on a cylindrical wall of a velodrorer of radius r rotating about its axis at the rate of f rev/s. The least coefficient of friction necessary so that he do not slip down is
Show Answer

Q80) A long jumper runs before jumping, because he Show Answer

Q81) A book is kept on the surface of a table. If the gravitational pull of the earth on the book is the force of action, then the force of reaction is exerted by
Show Answer

Q82) A piece of paper and a coin both having the same mass are dropped from the 10th floor a building. The piece of paper would tall more time to reach the ground because
Show Answer

Q83) A bullet of mass 20 g is fired in the horizontal direction with a velocity 150 m/s from a pistol of mass 1 kg. Recoil velocity of the pistol is
Show Answer

Q84) A motor vehicle is moving on a circle with a uniform speed. The net acceleration of the vehicle is
Show Answer

Q85) An object is undergoing a non-accelerated motion. Its rate of change in momentum is
Show Answer

Q86) If d denotes the distance covered by a car in time t and s denotes the displacement by the car during the same time, then
Show Answer

Q87) If an object undergoes a uniform circular motion, then its
Show Answer

Q88) A force F is applied on a body (which moves on a straight line) for a duration of 3 s. The momentum of the body changes from 10 g cm/s to 40 g cm/s. The magnitude of the force F is
Show Answer

Q89) Momentum of a body is
(I) a vector quantity.
(II) a conserved quantity in an isolated system.
(III) same as force in linear motion.
Select the correct answer using the code given below
Show Answer

Q90) If the ratio of the weight of a man in stationary lift and when it is move downwards with uniform acceleration is 3:2, then the value of alpha is
Show Answer

Q91) A body is thrown upward against gravity g with initial velocity u. Why one among the following is the correct expression for its final velocity when reaches the maximum height ?
Show Answer

Q92) A jet engine works on the principle of conservation of
Show Answer

Q93) When a moving bus suddenly applies brakes, the passengers sitting in it fall in the forward direction. This can be explained by
Show Answer

Q94) Mass of B is four times that of A. B moves with a velocity half that of A. Then B has
Show Answer

Q95) A man is at rest in the middle of a horizontal plane of perfectly smooth surface of ice. He can move himself to the shore by making use of Newton's Show Answer

Q96) For a particle revolving in a circular path, the acceleration of the particle is Show Answer

Q97) A body is thrown vertically upwards and then falls back on the ground. Its potential energy is maximum Show Answer

Q98) Which one of the following pairs does not have the same dimension ? Show Answer

Q99) Which one of the following graphs represents uniform motion ? Show Answer

Q100) An elastic spring has a force constant k. It is cut into three equal parts. The force constant of each part is Show Answer

Q101) The weight of body will increase significantly if it is taken Show Answer

Q102) An old man, unable to apply a large force, wishes to use a screw jack for lifting his car wheels. If L is the length of the rod used to turn the jack and P the pitch of jack screw, then he should use a jack in which Show Answer

Q103) If a piece of rock is brought from the moon to the earth, its
Show Answer

Q104) For a particle executing SHM, the equilibrium position is at x = 0 and the amplitude at x=0 and the amplitude at x = A, the KE of the particle will be equal to the potential energy
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Q105) The total energy of a particle executing simple harmonic motion is proportional to the Show Answer

Q106) A body executing simple harmonic motion while passing through its mean position will have Show Answer

Q107) The escape velocity of a body on the surface of the earth is 11.2 km/s. What is the escape velocity of the body on the surface of a planet which is 32 times as heavy as the earth and whose radius is twice the radius of the earth ? Show Answer

Q108) Which among the following is the necessary condition for simple harmonic motion ? Show Answer

Q109) The weight of an object may be assigned using Newton's Show Answer

Q110) A man is sitting on a rotating stool with his arms outstretched. If suddenly he folds his arm the angular velocity of the man would Show Answer

Q111) When a body moves with simple harmonic motion, then the phase difference between the velocity and the acceleration is Show Answer