Q.1
A rigid bar with weight of 100N is free to rotate about a friction less hinge at a wall and supported in a horizontal position by a spring scale attached to the ceiling at an angle of 30o to the vertical, as shown in figure. What force of tension is indicated by the spring scale?
ch-4_que_no-399_img_no1.png
  • a) 100N
  • b) 100 √3 N
  • c)100/√3
  • d)50 N
Q.2
Two objects stick together and move with a common velocity after colliding. Identify the type of collision.
  • a) elastic
  • b) inelastic
  • c) nearly elastic
  • d) perfectly inelastic
Q.3
In an inelastic collision between two objects with unequal masses,
  • a)the total momentum of the system will increase.
  • b) the total momentum of the system will decrease.
  • c)the kinetic energy of one object will increase by the amount that the kinetic energy of the other object decreases.
  • d)the momentum of one object will increase by the amount that the momentum of the other object decreases.
Q.4
A billiard ball collides with a stationary identical billiard ball in an elastic head-on collision. After the collision, which of the following is true of the first ball?
  • a) It move in same direction
  • b) It has one-half its initial velocity.
  • c)It comes to rest.
  • d)It moves in the opposite direction.
Q.5
A rocket with a lift-off mass 3.5×104 is blasted upwards with an initial acceleration of 10m/sThen the initial thrust of the blast
  • a) 3.5×105N
  • b) 7.0 ×105N
  • c)14.0 ×105N
  • d)1.74 ×105N
Q.6
A horizontal force of 10N is necessary to just hold a block stationary against wall. the coefficient of friction between a wall and block is 0.The weight of the block is
  • a) 20 N
  • b) 50 N
  • c) 100 N
  • d) 2N
Q.7
A marble block of mass 2 kg lying on ice when given a velocity of 6m/s is dropped by friction in 10s. Then the coefficient of friction is
  • a)0.02
  • b) 0.03
  • c)0.06
  • d)0.01
Q.8
Consider the following statementsA. Linear momentum of a system of particles is zeroB. Kinetic energy of a system of particle is zeroThen
  • a) A does not imply B and B does not imply A
  • b) A implies B but B does not imply A
  • c)A does not imply B but B implies A
  • d)A implies B and B implies A
Q.9
A block of mass M is pulled along a horizontal frictionless surface by a rope of mass m.If a force P is applied at the free end of the rope, the force exerted by the rope on the block is
  • a) Pm / ( M+m)
  • b) Pm( M-m)
  • c)P
  • d)PM/(M+m)
Q.10
A light spring balance hangs from the hook of the other light spring balance and a block of mass M kg hangs from the former one. Then the true statement about the scale reading is
  • a) both the scales read M kg each
  • b) the scale of the lower one reads M kg and of the upper one zero
  • c) the reading of the two scale can be anything but the sum of the reading will be M kg
  • d) the scale of the upper one reads M kg and of the lower one zero
Q.11
than one correct option Q409) A small block of mass 0.1kg lies on the a fixed inclined plane PQ which makes an angle θ with the horizonatl. A horizontal force of 1N acts on the block through its centre of mass as shown in figure. Block remains stationary if (take g= 10 m/s2
ch-4_que_no-409_img_no1.png
  • a) θ = 45°
  • b) θ > 45° and a frictional force acts on the block toeards P
  • c) θ > 45° and a frictional force acts on the block towards Q
  • d) θ < 45° and a frictional force acts on the block tpwards Q
Q.12
A uniform force of 3i + j newton acts on a particleof mass 2 kg. Hence the particle is displaced fromposition 2i+ k metre to position 4i + 3j - k metre. The work done by the force on the particle is … [ NEET 2013]
  • a) 9 J
  • b) 6J
  • c) 13 J
  • d) 15J
Q.13
A balloon with mass 'm' is descending down with an acceleration 'a' (where a < g). How much mass should be removed from it so that it starts moving up with an acceleration 'a'?
  • a)
    ch-4_qn-411choice_img_no1.png
  • b)
    ch-4_qn-411choice_img_no2.png
  • c)
    ch-4_qn-411choice_img_no3.png
  • d)
    ch-4_qn-411choice_img_no4.png
Q.14
A system consists of three masses m1,m2 and m3 connected by a string passing over a pulley P. The mass m1 hangs freely and m2 and m3 are on a rough horizontal table (the coefficient of friction=µ).The pulley is frictionless and of negligible mass. The downward accelerationofmassm1, is ... (Assume m1 =m2 =m3 =m)
ch-4_que_no-412_img_no1.png
  • a)
    ch-4_qn-412choice_img_no1.png
  • b)
    ch-4_qn-412choice_img_no2.png
  • c)
    ch-4_qn-412choice_img_no3.png
  • d)
    ch-4_qn-412choice_img_no4.png
Q.15
A body of mass (4m) is lying in x-y plane at rest. It suddenly explodes into three pieces. Two pieces, each of mass (m) move perpendicular to each other with equal speeds(v). The total kinetic energy generated due to explosion is … [ AIPMT 2014]
  • a) 2mv2
  • b) 4mv2
  • c) mv2
  • d) 3/2 mv2
Q.16
The force 'F' acting on a particle of mass 'm' is indicated by the force-time graph shown below. The change in momentum of the particle over the time interval from zero to 8s is ….[ AIPMT 2014]
ch-4_que_no-414_img_no1.png
  • a) 12Ns
  • b) 6 Ns
  • c) 24 Ns
  • d) 20 Ns
Q.17
Three blocks A, B and C, of masses 4 kg, 2 kg and 1 kg respectively, are in contact on a friction less surface, as shown. If a force of 14 N is applied on the 4 kg block, then the contact force between A and B is : …[NEET 2015]
ch-4_que_no-415_img_no1.png
  • a) 18 N
  • b) 2 N
  • c) 6 N
  • d) 8 N
Q.18
A rod of weight W is supported by two parallel knife edges A and B and is in equilibrium in a horizontal position. The knives are at a distance d from each other. The center of mass of the rod is at distance x from A. The normal reaction on A is : …[ NEET 2015]
  • a)
    ch-4_qn-416choice_img_no1.png
  • b)
    ch-4_qn-416choice_img_no2.png
  • c)
    ch-4_qn-416choice_img_no3.png
  • d)
    ch-4_qn-416choice_img_no4.png
Q.19
A block A of mass m1 rests on a horizontal table. A lights string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m2 is suspended. The coefficient of kinetic friction between the block and the table is µk. When the block A is sliding on the table, the tension in the string is : … [AIPMT 2015]
  • a)
    ch-4_qn-417choice_img_no1.png
  • b)
    ch-4_qn-417choice_img_no2.png
  • c)
    ch-4_qn-417choice_img_no3.png
  • d)
    ch-4_qn-417choice_img_no4.png
Q.20
A plank with a box on it at one end is gradually raised about the other end. As the angle of inclination with the horizontal reaches 30°, the box starts to slip and slides 4.0 m down the plank in 4.0s.The coefficients of static and kinetic friction between the box and the plank will be, respectively:
  • a) 0.4 and 0.3
  • b) 0.6 and 0.6
  • c) 0.6 and 0.5
  • d) 0.5 and 0.6
Q.21
On a frictionless surface, a block of mass. M moving at speed v collides elastically with another block of same mass M which is initially at rest. After collision the first block moves at an angle θ to its initial direction and has a speed v/The second block's speed after the collision is :-
  • a)
    ch-4_qn-419choice_img_no1.png
  • b)
    ch-4_qn-419choice_img_no2.png
  • c)
    ch-4_qn-419choice_img_no3.png
  • d)
    ch-4_qn-419choice_img_no4.png
Q.22
A rigid ball of mass m strikes a rigid wall at 60° and gets reflected without loss of speed as shown in the figure below. The value of impulse imparted by the wall on the ball will be … [ NEET II – 2016]
ch-4_que_no-420_img_no1.png
  • a)
    ch-4_qn-420choice_img_no1.png
  • b)
    ch-4_qn-420choice_img_no2.png
  • c) mV
  • d) 2mV
Q.23
Two identical balls A and B having velocities of0.5 m/s and –0.3 m/s respectively collide elastically in one dimension. The velocities of B and A after the collision respectively will be …[NEET II -2016]
  • a) –0.3 m/s and 0.5 m/s
  • b) 0.3 m/s and 0.5 m/s
  • c) –0.5 m/s and 0.3 m/s
  • d) 0.5 m/s and –0.3 m/s
Q.24
Two blocks A and B of masses 3m and m respectively are connected by a massless and inextensible string. The whole system is suspended by a massless spring as shown in figure. The magnitudes of acceleration of A and B immediately after the string is cut, are respectively…[ NEET 2017]
ch-4_que_no-422_img_no1.png
  • a) g, g/3
  • b) g/3, g
  • c) g, g
  • d) g/3,g/3
Q.25
than one correct option Q423) In the figure, a ladder of mass m is shown leaning against a wall. It is in static equilibrium making an angle θ with the horizontal floor. The coefficient of friction between the wall and the ladder is µ1 and that between the floor and the ladder is µThe normal reaction of the wall on the ladder is N1 and that of the floor is NIf the ladder is about to slip, then[ IIT Advance 2013]
ch-4_que_no-423_img_no1.png
  • a)
    ch-4_qn-423choice_img_no1.png
  • b)
    ch-4_qn-423choice_img_no2.png
  • c)
    ch-4_qn-423choice_img_no3.png
  • d)
    ch-4_qn-423choice_img_no4.png
Q.26
A block of mass m1 = 1 kg another mass m2 = 2 kg, are placed together (see figure) on aninclined plane with angle of inclination θ. Various values of θ are given in List I. The coefficient of friction between the block m1 and the plane is always zero. The coefficientof static and dynamic friction between the block m2 and the plane are equal to µ = 0. In List II expressions for the friction on block m2 are given. Match the correct expression ofthe friction in List II with the angles given in List I, and choose the correct option. Theacceleration due to gravity is denoted by g. [Useful information : tan (5.5°) θ ≈ 0.1; tan(11.5°) ≈ 0.2; tan(16.5°) ≈ 0.3]
List I List II
P. θ = 5° m2g sinθ
Q. θ = 10° (m1 + m2) g sinθ
R. θ = 15° µm2 g cosθ
S. θ = 20° µ (m1 + m2) g cosθ

ch-4_que_no-424_img_no1.png
  • a) P-1, Q-1, R-1, S-3
  • b) P-2, Q-2, R-2, S-3
  • c) P-2, Q-2, R-2, S-4
  • d) P-2, Q-2, R-3, S-3
Q.27
A person in a lift is holding a water jar, which has a small hole at the lower end of its side. When the lift is at rest, the water jet coming out of the hole hits the floor of the lift at a distance d of 1.2 m from the person. In the following, state of the lift’s motion is given in List I and the distance where the water jet hits the floor of the lift is given in List II. Match the statements from List I with those in List II and select the correct answer using the code given below the lists.
List I List II
P. Lift is accelerating vertically up. d = 1.2 m
Q. Lift is accelerating vertically down with an acceleration less than the gravitational acceleration. d > 1.2 m
R. Lift is moving vertically up with constant speed. d < 1.2 m
S. Lift is falling freely. No water leaks out of the jar
  • a) P-2, Q-3, R-2, S-4
  • b) P-2, Q-3, R-1, S-4
  • c) P-1, Q-1, R-1, S-4
  • d) P-2, Q-3, R-1, S-1
Q.28
A uniform wooden stick of mass 1.6 kg and length “l” rests in an inclined manner on a smooth, vertical wall of height h(
  • a)
    ch-4_qn-427choice_img_no1.png
  • b)
    ch-4_qn-427choice_img_no2.png
  • c)
    ch-4_qn-427choice_img_no3.png
  • d)
    ch-4_qn-427choice_img_no4.png
Q.29
than one correct option Q428) A flat plate is moving normal to its plane through a gas under the action of a constant force F. The gas is kept at a very low pressure. The speed of the plate v is much less than the average speed u of the gas molecules. Which of the following options is/are true ?
  • a) The resistive force experienced by the plate is proportional to v
  • b) The pressure difference between the leading and trailing faces of the plate is proportional to uv.
  • c) The plate will continue to move with constant non-zero acceleration, at all times
  • d) At a later time the external force F balances the resistive force.
Q.30
A block A of mass m1 rests on a horizontal table. A light string connected to it passes over a frictionless pulley at the edge of table and from its other end another block B of mass m2 is suspended. The coefficient of kinetic friction between the block and the table is μk. When a block slide on the table what is the tension in the string

  • ch-4_qn-429choice_img_no1.png

  • ch-4_qn-429choice_img_no2.png

  • ch-4_qn-429choice_img_no3.png

  • ch-4_qn-429choice_img_no4.png
0 h : 0 m : 1 s