JEE Questions for Physics Motion In A Plane Quiz 12 - MCQExams.com

A particle is moving in a vertical circle. The tension in the string when passing through two positions at angles 30o and 60o from vertical (lowest position) are T1 and T2 respectively, then
  • T1 = T2
  • T2 < T1
  • T1 > T2
  • Tension in the string always remains the same
A particle is kept at rest at the top of a sphere of diameter 42 m. When disturbed slightly, it slides down. At what height \'h\' from the bottom, the particle will leave the sphere
  • 14 m
  • 28 m
  • 35 m
  • 7 m
The angle turned by a body undergoing circular motion depends on time as θ = θ0 + θ1t + θ2t2. Then, the angular acceleration of the body is
  • θ1
  • θ2
  • 2θ1
  • 2θ2
A small disc is on the top of a hemisphere of radius R. What is the smallest horizontal velocity v that should be given to the disc for it to leave the hemisphere and not slide down it? [There is no friction]

  • Physics-Motion in a Plane-80940.png
  • 2)
    Physics-Motion in a Plane-80941.png

  • Physics-Motion in a Plane-80942.png

  • Physics-Motion in a Plane-80943.png
A body of mass 0.4 kg is whirled in a vertical circle making 2 rev/sec. If the radius of the circle is 2 m, then tension in the string when the body is at the top of the circle, is
  • 41.56 N
  • 89.86 N
  • 109.86 N
  • 115.86 N
The maximum and minimum tension in the string whirling in a circle of radius 2.5 n with constant velocity are in the ratio 5:3, the its velocity is
Physics-Motion in a Plane-80945.png
  • a and d
  • a and c
  • only a
  • only b
A particle moves in a circular path with decreasing speed. Choose the correct statement
  • Angular momentum remains constant
  • 2)
    Physics-Motion in a Plane-80947.png
  • Particle moves in a spiral path with decreasing
  • The direction of angular momentum remains constant
A bridge is in the form of a semi circle of radius 40m. The greatest with which a motor cycle can cross the bridge without leaving the ground at the highest point is (g = 10m/s–2)
(frictional force is negligibly small)
  • 40 m/s–1
  • 20 m/s–1
  • 30 m/s–1
  • 15 m/s–1
The maximum range of a gun on horizontal terrain is 16 km. If g = 10 m/s2. What must be the muzzle velocity of the shell?
  • 200 m/s
  • 400 m/s
  • 100 m/s
  • 50 m/s
A stone is just released fro the window of a train moving along a horizontal straight track. The stone will hit the ground folloiwng
  • Straight path
  • Circular path
  • Parabolic path
  • Hyperbolic path
An aeroplane if flying at a constant horizontal velocity of 600 km/hr at an elevation of 6 km towards a point directly above the target on the earth\'s surface. At an appropriate time, the pilot releases a ball so that it strikes the target at the earth. The ball will appear to be falling
  • On a parabolic path as seen by pilot in the plane
  • Vertically along a straight path as seen by an observer on the ground near the target
  • On a parabolic path as seen by an observer on the ground near the target
  • On a zig-zag path seen by pilot in the plane
A bomb is dropped from an aeroplane moving horizontally at constant speed. When air resistance is taken into consideration, the bomb
  • Falls to earth exactly below the aeroplane
  • Falls to earth behind the aeroplane
  • Falls to earth ahead of the aeroplane
  • Files with the aeroplane
A man projects a coin upwards from the gate of a uniformly moving train. The path of coin for the man will be
  • Parabolic
  • Inclined straight line
  • Vertical straight line
  • Horizontal straight line
A ball is rolled off the edge of a horizontal table at a speed of 4 m/sec. It hits the ground after 0.4 second. Which statement given below is true?
  • It hits the ground at a horizontal distance 1.6 m from the edge of the table
  • The speed with which it hits the ground is 4.0 m/sec
  • height of the table is 0.8 m
  • It hits the ground at an angle of 60o to the horizontal
A body is thrown horizontally from the top of a tower of height 5 m. It touches the ground at a distance of 10 m from the foot of the tower. The initial velocity of the body is (g = 10 ms–2)
  • 2.5 ms–1
  • 5 ms–1
  • 10 ms–1
  • 20 ms–1
At the height 80 m, an aeroplane is moving with 150 m/s. A bomb is dropped from it so to hit a target. At what distance from the target should be bomb be dropped (Given g = ms–2)
  • 605.3 m
  • 600 m
  • 80 m
  • 230 m
A bomber plane moves horizontally with a speed of 500 m/s and a bomb released from it, strikes the ground in 10 sec. Angle at which it strikes the ground will be (g = 10 ms–2)

  • Physics-Motion in a Plane-80953.png
  • 2)
    Physics-Motion in a Plane-80954.png

  • Physics-Motion in a Plane-80955.png

  • Physics-Motion in a Plane-80956.png
A large number of bullets are fired in all directions with same speed v. What is the maximum area on the ground on which these bullets will spread?

  • Physics-Motion in a Plane-80958.png
  • 2)
    Physics-Motion in a Plane-80959.png

  • Physics-Motion in a Plane-80960.png

  • Physics-Motion in a Plane-80961.png
A cart is moving horizontally along a straight line with constant speed 30 m/s. A projectile is to be fired from the moving cart in such a way that it will return to the cart after the cart has moved 80 m. At what speed (relative the cart) must the projectile be fired? (take g = 10 m/s2)
  • 10 m/s
  • 10√8 m/s
  • 40/3 m/s
  • None of these
A ball is projected horizontally with a velocity of 5 m/s from the top of a building 19.6 m high. How long will the ball take to hit the ground?
  • √2 s
  • 2 s
  • √3 s
  • 3 s
A boy can throw a stone up to a maximum height of 10 m. The maximum horizontal distance that the boy car throw the same stone upto will be
  • 20√2 m
  • 10 m
  • 10√2 m
  • 20 m
A projectile moves from the ground such that its horizontal displacement is x = Kt and vertical displacement is y = kt(1 – αt), where K and α are constants and t is time. Find out total time of flight (T) and maximum height attained (Ymax) its

  • Physics-Motion in a Plane-80966.png
  • 2)
    Physics-Motion in a Plane-80967.png

  • Physics-Motion in a Plane-80968.png

  • Physics-Motion in a Plane-80969.png
A projectile is projected with velocity V0 along x-axis. The deceleration on the particle is proportional to the square of the distance from the origin i.e., a = αx2, the distance at which the particle stops is

  • Physics-Motion in a Plane-80971.png
  • 2)
    Physics-Motion in a Plane-80972.png

  • Physics-Motion in a Plane-80973.png

  • Physics-Motion in a Plane-80974.png
The angle of projection at which the horizontal range and maximum height of projectile are equal is
  • 45o
  • 2)
    Physics-Motion in a Plane-80976.png

  • Physics-Motion in a Plane-80977.png
  • 60o
A body is fired vertically upward. At half the maximum height, the velocity of the body is 10 m/s. The maximum height raised by the body is
  • 0 m
  • 10 m
  • 15 m
  • 20 m
A body is thrown upward from the Earth surface with velocity 5 m/s and from a planet surface with velocity 3 m/s. Both follow the same path. What is the projectile acceleration due to gravity on the planet?
  • 2 m/s2
  • 3.5 m/s2
  • 4 m/s2
  • 5 m/s2
A cricketer hits a ball with a velocity 25 m/s at 60o above the horizontal. How for above the ground it passes over a fielder 50 m from the bat (assume the ball is struck very close to the ground)
  • 8.2 m
  • 9.0 m
  • 11.6 m
  • 12.7 m
A bullet is fired with a velocity u making an angle of 60o with the horizontal plane. The horizontal component of the velocity of the bullet when it reaches the maximum height is
  • u
  • 0

  • Physics-Motion in a Plane-80982.png
  • u/2
For an object thrown at 45o to horizontal, the maximum height (H) and horizontal range (R) are related as
  • R = 16H
  • R = 8H
  • R = 4H
  • R = 2H
A particles of mass m is projected with velocity v making an angle of 45owith the horizontal. The magnitude of the angular momentum of the particle about the point of projection when the particle is at its maximum height is (where g = acceleration due to gravity)
  • Zero
  • 2)
    Physics-Motion in a Plane-80985.png

  • Physics-Motion in a Plane-80986.png

  • Physics-Motion in a Plane-80987.png
0:0:1


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