JEE Questions for Physics Motion In A Plane Quiz 15 - MCQExams.com

Assertion: The maximum horizontal range of projectile is proportional to square of velocity
Reason: The maximum horizontal range of projectile is equal to maximum height attained by projectile.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: A body of mass 1 kg is making 1 rps in a circle of radius 1 m. Centrifugal force acting on it is 4π2N.
Reason: Centrifugal force is given by F = mv2/r
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: A coin is placed on phonogram turn table. The motor is started, coin moves along the moving table.
Reason: The rotating table is providing necessary centripetal force to the coin.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: The trajectory of projectile is quadratic in y and linear in x.
Reason: y component of trajectory is independent of x-component
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: Two similar trains are moving along the equatorial line with the same speed but in opposite direction. They will exert equal pressure on the rails.
Reason: In uniform circular motion the magnitude of acceleration remains constant but the direction continuously changes.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: When a body is dropped or thrown horizontally from the same height, it would reach the ground at the same time.
Reason: Horizontal velocity has no effect on the vertical direction
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: When the velocity of projection of a body is made n times, its times of flight becomes n times
Reason: Range of projectile does not depend on the initial velocity of a body.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: Improper banking of roads causes wear and tear of tyres.
Reason: The necessary centripetal force is provided by the force of friction between the tyres and the road.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: When range of a projectile is maximum, its angle of projection may be 45o or 135o.
Reason: Whether θ is 45o or 135o, value of range remains the same, only the sign changes.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: In order to hit a target, a man should point his rifle in the same direction as target.
Reason: The horizontal range of the bullet is dependent on the angle of projectile with horizontal direction.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: When an automobile while going too fast around a curve overturns, its inner wheels leave the ground first.
Reason: For a safe turn the velocity of automobile should be less than the value of safe limit velocity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: During a turn, the value of centripetal force should be less than the limiting frictional force.
Reason: The centripetal force is provided by the frictional force between the tyres and the road.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: When a vehicle takes a turn on the road, it travels along a nearly circular path.
Reason: In circular motion, velocity of vehicle remains same.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: As the frictional force increases, the safe velocity limit for taking a turn on an unbanked road also increases
Reason: Banking of roads will increase the value of limiting velocity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: If both the speed of a body and radius of its circular path are doubles, then centripetal force also gets doubled
Reason: Centripetal force is directly proportional to both speed of a body and radius of circular path.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: In circular motion, the centripetal and centrifugal force acting in opposite direction balance each other
Reason: Centripetal and centrifugal forces don\'t act at the same time.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Assertion: A safe turn by a cyclist should neither be fast nor sharp.
Reason: The bending angle from the vertical would decrease with increase in velocity.
  • If both Assertion and Reason are true and the Reason is the correct explanation of the Assertion
  • If both Assertion and Reason are true but Reason is not the correct explanation of the Assertion
  • If Assertion is true but Reason is false
  • If the Assertion and Reason both are false
  • If Assertion is false but Reason is true
Roads are banked on curves so that
  • The speeding vehicles may not fall outwards
  • The frictional force between the road and vehicle may be decreased
  • The wear and tear of this may be avoided
  • The weight of the vehicle may be decreased
In uniform circular motion of a particle
  • Velocity is constant but acceleration is variable
  • Velocity is variable but acceleration in constant
  • Both speed and acceleration arc constant
  • Speed is constant but acceleration is variable
  • Both speed and acceleration are variable
For a body moving in a circular path, a condition for no skidding if μ is the coefficient of friction, is

  • Physics-Motion in a Plane-81148.png
  • 2)
    Physics-Motion in a Plane-81149.png

  • Physics-Motion in a Plane-81150.png

  • Physics-Motion in a Plane-81151.png
Tom and Dick are running forward with the same speed. They are throwing a rubber bull to each other at a conant speed v as seen by the thrower. According to Sam who is standing on the ground the speed of the ball is
  • Same as v
  • Greater than v
  • Less than v
  • None of these
A particle is moving on a circular path of radius r with uniform velocity v. The change in velocity when the particle moves from P to Q is (∠POQ = 40°)
Physics-Motion in a Plane-81153.png
  • 2vcos40°
  • 2vsin20°
  • 2vsin40o
  • 2vcos20°
A body is revolving with a uniform speed v in a circle of radius r. The tangential acceleration is

  • Physics-Motion in a Plane-81155.png
  • 2)
    Physics-Motion in a Plane-81156.png
  • Zero

  • Physics-Motion in a Plane-81157.png
A particle does uniform circular motion in a horizontal plane. The radius of the circle is 20cm. The ceniripetal force acling on the particle is ION. It’s kinetic energy is
  • 0.1 J
  • 0.2 J
  • 2.0 J
  • 1.0 J
A body of mass m is suspended from a string of length l. What is minimum horizontal velocity that should he given to the body in its lowest position so that it may complete one full revolution in the vertical plane with the p.int of suspension as the centre of the circle

  • Physics-Motion in a Plane-81159.png
  • 2)
    Physics-Motion in a Plane-81160.png

  • Physics-Motion in a Plane-81161.png

  • Physics-Motion in a Plane-81162.png
A particic moves with constant angular velocity in circular path of certain radius and is acted upon by a certain centripetal force F. If the angular velocity is doubled, keeping radius the same, the new force will
  • 2F
  • F2
  • 4F
  • F/2
In the above question, if the angular velocity is kept same but the radius of the path is halved, the new force will be
  • 2F
  • F2
  • F/2
  • F/4
In above question, if the centripetal force F is kept constant but the angular velocity is doubled, the new radius of the path (original radius R) will be
  • 2R
  • R/2
  • R/4
  • 4R
A small body of mass m slides down from the top of a hemisphere of radius r. The surface of block and hemisphere are frictionless. The height at which the body lose contact with the surface of the sphere is
Physics-Motion in a Plane-81167.png

  • Physics-Motion in a Plane-81168.png
  • 2)
    Physics-Motion in a Plane-81169.png

  • Physics-Motion in a Plane-81170.png

  • Physics-Motion in a Plane-81171.png
A body of mass m kg is rotating in a vertical circle at the end of a string of length r m. The difference in the kinetic energy at the top and the bottom of the circle is

  • Physics-Motion in a Plane-81172.png
  • 2)
    Physics-Motion in a Plane-81173.png

  • Physics-Motion in a Plane-81174.png

  • Physics-Motion in a Plane-81175.png
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