Back to Newton's Laws of Motion

Set 7 of 7 · Questions 181-197 of 197

In the print window choose “Save as PDF”. The file prints without a web address or date line.

Mere Teacher

Mere Teacher · Previous Year Questions

JEE Main Physics · Newton's Laws of Motion · Set 7 (Q181-197)

QR code to mereteacher.com

Scan or visit mereteacher.com for free PYQ practice, timed CBT tests, step-by-step solutions and BroBot AI. Answers and solutions are free with a sign-up.

  1. 181.
    A particle of mass is moving in a horizontal circle of radius with uniform speed . When the particle moves from one point to a diametrically opposite point, its
    1. (1)
    2. (2)momentum changes by
    3. (3)kinetic energy changes by 4
    4. (4)kinetic energy changes by
  2. 182.
    A smooth circular groove has a smooth vertical wall as shown in figure. A block of mass m moves against the wall with a speed v. Which of the following curve represents the correct relation between the normal reaction on the block by the wall (N) and speed of the block (v)?
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  3. 183.
    A force acts on a body of mass 5kg. If the body starts from rest, its position vector at time t=10s, will be;
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  4. 184.
    A man tries to remain in equilibrium by pushing with his hands and feet against two parallel walls. For equilibrium,
    1. (1)he must exert equal forces on the two walls
    2. (2)the forces of friction at the two walls must be equal
    3. (3)friction must be present on both walls
    4. (4)the coefficients of friction must be the same between both walls and the man
  5. 185.
    The figure represents the momentum time (p-t) curve for a particle moving along an axis under the influence of the force. Identify the regions on the graph where the magnitude of the force is maximum and minimum respectively? If (-) < .
    1. (1)c and a
    2. (2)b and c
    3. (3)c and b
    4. (4)a and b
  6. 186.
    A mass of is suspended by a rope of length from the ceiling. A force is applied horizontally at the mid-point of the rope such that the top half of the rope makes an angle of with the vertical. Then equals: (Take and the rope to be massless)
    1. (1)
    2. (2)
    3. (3)
    4. (4)80 N
  7. 187.
    The tension in the spring is
    1. (1)zero
    2. (2)
    3. (3)
    4. (4)
  8. 188.
    Which of the following is the correct order of forces
    1. (1)Weak < gravitational forces < strong forces (nuclear) < electrostatic
    2. (2)Gravitational < weak < (electrostatic) < strong force
    3. (3)Gravitational < electrostatic < weak < strong force
    4. (4)Weak < gravitational < electrostatic < strong forces
  9. 189.
    A balloon has mass of 10 g in air. The air escapes from the balloon at a uniform rate with velocity 4.5 cm/s. If the balloon shrinks in 5 s completely. Then, the average force acting on that balloon will be (in dyne).
    1. (1)3
    2. (2)9
    3. (3)12
    4. (4)18
  10. 190.
    The initial mass of a rocket is 1000kg. Calculate at what rate the fuel should be burnt so that the rocket is given an acceleration of . The gases come out at a relative speed of with respect to the rocket:[Use ]
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  11. 191.
    A mass of 10 kg is suspended vertically by a rope form the roof. When a horizontal force is applied on the rope at some point, the rope deviated at an angle of 45º at the roof point. If the suspended mass is at equilibrium, the magnitude of the force applied is (g = 10 )
    1. (1)200 N
    2. (2)100 N
    3. (3)140 N
    4. (4)70 N
  12. 192.
    A force vector applied on a mass is represented as and accelerates with 1 . What will be the mass of the body?
    1. (1)10 kg
    2. (2)20 kg
    3. (3) kg
    4. (4) kg
  13. 193.
    Two forces with equal magnitudes F act on a body and the magnitude of the resultant force is F/3. The angle between the two forces is
    1. (1)
    2. (2)
    3. (3)
    4. (4)
  14. 194.
    A light spring of spring constant k is cut into two equal halves. Each half is connected in Parallel then net spring constant of the combination is
    1. (1)
    2. (2)
    3. (3)2k
    4. (4)4k
  15. 195.
    A mass of 10 kg is suspended vertically by a rope of length 5m from the roof. A force of 30 N is applied at the middle point of rope in horizontal direction. The angle made by upper half of the rope with vertical is = (x x ). The value of x is _________ .
    (Given g= 10 m/)
  16. 196.
    Four forces are acting at a point P in equilibrium as shown in figure. The ratio of force to is 1: x where x =_____.
  17. 197.
    A stone tied to 180 cm long string at its end is making 28 revolutions in horizontal circle in every minute. The magnitude of acceleration of stone is . The value of x________.