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CBSE Questions for Class 11 Engineering Physics Motion In A Straight Line Quiz 3 - MCQExams.com

A ball is projected vertically up with a velocity of 40 m/s. At the same time another ball is dropped from a height of 100 m. The magnitudes of their velocities are equal after a time of (g=10m/s2)
  • 2 sec
  • 1 sec
  • 3 sec
  • 4 sec
A car, starting from rest, accelerates at the rate f through a distance S, then continues at constant speed for time t and then decelerate at the rate f2 to come to rest. If the total distance travelled is 15S, then
  • S=ft
  • S=16ft2
  • S=172ft2
  • S=14ft2
A stone is dropped from a height h. Simultaneously another stone is thrown up from the ground which reaches the height 4h. The two stones cross each other after a time:-
  • h2g
  • h8g
  • 8hg
  • 2hg
A body is thrown vertically upwards with an initial velocity u reaches a maximum height in 6s. The ratio of the distance travelled by the body in the first second to the seventh second is
  • 1:1
  • 11:1
  • 1:2
  • 1:11
A point moves with uniform acceleration. Let v1v2v3 denote the average velocities in three successive intervals of time t1t2t3. Correct relation among the following is
  • (v1v2) : (v2v3) = (t1t2) : (t2t3)
  • (v1v2) : (v2v3) = (t1+t2) : (t2+t3)
  • (v1v2) : (v2v3) = (t1t2) : (t2+t3)
  • (v1v2) : (v2v3) = (t1+t2) : (t2t3)
A man in a lift ascending with an upward acceleration throws a ball vertically upwards and catches it after t1 second. Later when the lift is descending with the same acceleration, the man throws the ball up again with same velocity and catches it after t2 second.
A) The acceleration of the elevator is g(t2t1)(t1+t2)
B) The velocity of projection of the ball relative to elevator is t2t1gt1+t2.
We can conclude that:
  • only A is true
  • only B is true
  • Both A and B is true
  • Both A and B are false
A body is at rest at x =At t = 0, it starts moving in the positive x-direction with a constant acceleration. At the same instant another body passes through x = 0 moving in the positive x-direction with a constant speed. The position of the first body is given by x1(t) after time t and that of the second body by  x2(t) after the same time interval. Which of the following graphs correctly describes (x1x2) as a function of time t ?
An object falls from a bridge that is 45 m above water. It falls directly into a small boat moving with constant velocity that is 12 m from the point of impact when the object was released. The speed of the boat is
  • 3m/s
  • 4m/s
  • 5m/s
  • 6m/s
A body, projected vertically upwards, crosses a point twice its journey at a height h just after t1 and t2 seconds. Maximum height reached by the body is
  • g4(t1+t2)2
  • g[t1+t24]2
  • 2g[t1+t24]2
  • g4(t1t2)
A train is moving forward at a velocity of 2.0 m/s. At the instant the train begins to accelerate at 0.80m/s2, a passenger drops a coin which takes 0.50 s to fall on the floor. Relative to a spot on the floor directly under the coin at release, the coin lands
  • 1.1 m towards the rear of the train
  • 1.0 m towards the rear of the train
  • 0.10 m towards the rear of the train
  • 0.90 m towards the front of the train
A ball is thrown vertically upwards with a velocity u from the balloon descending with velocity v. The ball will pass by the balloon after time
  • uν2g
  • 2(u+ν)g
  • 2uνg
  • 2u+νg
An elevator ascends with an upward acceleration of 0.2 m/s2. At the instant when its upward speed is 2 m/s, a loose bolt 5 m high from the floor drops from the ceiling of the elevator. The time taken by the bolt to strike the floor and the distance it has fallen are (Take g=9.8 m/s2)
  • 1s, 1.9m
  • 1s, 2.9m
  • 1s, 4.9m
  • 1s, 3.9m
A boy standing on an open car throws a ball vertically upwards with a velocity of 9.8 m/s, while moving horizontally with uniform acceleration of 1 m/s2 starting from rest. The ball will fall behind the boy on the car at a distance of
  • 1 m
  • 2 m
  • 3 m
  • 4 m
A parachutist after bailing out falls for 10 s without friction. When the parachute opens he descends with an acceleration of 2 m/s2 against his direction and reached the ground with 4 m/s. From what height he has dropped himself? (g=10 m/s2)
  • 500 m
  • 2496 m
  • 2996 m
  • 4296 m
A 5 kg stone falls from a height of 1000 m and penetrates 2 m in a layer of sand. The time of penetration is
  • 14.285 s
  • 0.0285 s
  • 7.146 s
  • 0.285 s
 A ball of mass 100 gm is projected vertically upward from the ground with a velocity of 50ms1 . At the same time another identical ball is dropped from a height of 100 m to fall freely along the same path as that followed by the first ball. After some time the two balls collide, stick together and finally fall to the ground. The time taken by the combined mass to fall to the ground is approximately (g=10ms2)
  • 4.5 s
  • 6.5 s
  • 9 s
  • 13 s
A ball is projected from the bottom of a tower and is found to go above the tower and is caught by the thrower at the bottom of the tower after a time interval t1. An observer at the top of the tower finds the same ball go up above him and then come back to his level in a time interval t2 .The height of the tower is
  • 12gt1t2
  • gt1t28
  • g8(t21t22)
  • g2(t1t2)2
A particle starts from rest with uniform acceleration a. Its velocity after n second is v. The displacement of the body in the last two second is

  • 2v(n1)n
  • v(n1)n
  • v(n+1)n
  • 2v(2n+1)n
A ball is dropped from a high rise platform at t=0 starting from rest. After 6 seconds another ball is thrown downwards from the same platform with a speed v. The two balls meet at t=18 s. What is the value of v ?
(take g=10 m/s2)
  • 75 m/s
  • 55 m/s
  • 40 m/s
  • 60 m/s
Two balls A and B are thrown with same velocity u from the top of a tower Ball A is thrown vertically upward and the ball B is thrown vertically downward. Choose the correct statement.

42241.jpg
  • Ball B reaches the ground with greater velocity
  • BallA reaches the ground with greater velocity
  • Both the balls reach the ground with same velocity
  • Cannot be interpreted
A stone is dropped into a well in which the water level is h below, the top of the well. If v is velocity of sound, then time T after which the splash is heard is equal to
  • 2hv
  • 2hv+hg
  • 2hg+hv
  • h2g+2hv
A truck running along a straight line increases its speed uniformly from 30m/s to 60m/s over a time interval 1 min. The distance travelled during this time interval is
  • 900 m
  • 1800 m
  • 2700 m
  • 3600 m
If a body is thrown vertically upward and rises to a height of 10 m, then time taken by the body to reach the highest point is
  • 1.043 s
  • 1.43 s
  • 1.024 s
  • none of these
A particle is thrown upwards from ground. It experiences a constant air resistance force which can produce a retardation of 2m/s2. The ratio of time of ascent to the time of descent is :[g=10 m/s2]
  • 1:1
  • 23
  • 23
  • 32
A car starts from rest and moves along the x-axis with a constant acceleration 5 ms2 for 8 s. If it then continues with constant velocity, what distance will the car cover in 12 seconds since it started from rest?
  • 160 m
  • 240 m
  • 320 m
  • 400 m
An object starting from rest travels 20 m in first 2 s and 160 m in next 4 s.
What will be the velocity( in m/s) after 7 s from the start.
  • 0
  • 10
  • 65
  • 70
A particle moves in a straight line with a constant acceleration. It changes its velocity from 10ms1 to 20ms1 while passing through a distance 135m in t second. The value of t is 
  • 12
  • 9
  • 10
  • 1.8
A particle is projected vertically upwards with a speed u.
  • When it rises to half its maximum height its velocity is u2.
  • Time taken to rise to half its maximum height is half the time taken to reach maximum height.
  • Time taken to rise to three fourth its maximum height is half the time taken to reach its maximum height.
  • The acceleration of the particle when it reaches its maximum height is zero.
A stone is dropped from a certain height, which can reach the ground in 5 s. After 3 s of its fall, it is stopped and again allowed to fall. Then, the time taken by the stone to reach the ground for the remaining distance is :
  • 3 s
  • 4 s
  • 2 s
  • None of these
A body falls from a height of 200 m. If gravitational attraction ceases after 2 s, further time taken by it to reach the ground is (g=10ms2).
  • 5 s
  • 9 s
  • 13 s
  • 17 s
A body thrown vertically up with a velocity 'u' reaches the maximum height 'h' after 'T' second. The correct statement among the following is :
  • At a height h2 from the ground its velocity is u2
  • At a time T its velocity is 'u'
  • At a time '2T' its velocity is -u
  • At a time 2T its velocity is -6u
Two stones are dropped down simultaneously from different heights. At the starting time, the distance between them is 30 cm. After 1 s, the distance between the two stones will be (g=10ms2).
  • 10cm
  • 20cm
  • 30cm
  • 0cm
A freely falling body travels with uniform acceleration .
  • True
  • False
A gun is fired at a target. At the moment of firing, the target is released and allowed to fall freely under gravity. Then the bullet :
(Assume zero air resistance)
  • Misses the target by passing above it
  • Hits the target
  • Misses the target by passing below it
  • May or may not hit
A person, seated in a train under motion, is at rest with reference to :
  • The train.
  • A person watching him from the front seat.
  • A car moving in the same direction and speed of the train.
  • Trees on ground.
A body A is thrown vertically upwards with such a velocity that it reaches a maximum height of h in time t. Simultaneously another body B is dropped from height h. It strikes the ground and does not rebound. The velocity of A relative to B v/s time graph is best represented by (upward direction is positive)
The ratio of time taken by two cars P, Q starting from rest moving along a straight road with equal accelerations is 2 : 1, then the :
  • Final velocity of car P > final velocity of car Q.
  • Final velocity of car P < final velocity of car Q.
  • Ratio of VP to VQ is 2 : 2.
  • Ratio of distance travelled by car 'P' to car 'Q' is 2 : 1
A body standing on a long railroad car throws a ball straight upwards, the car is moving on the horizontal road with an acceleration 1 ms2. The vertical velocity given is 9.8 ms1. How far behind the boy the ball will fall on the railroad car?
  • 1 m
  • 32 m
  • 74 m
  • 2 m
The acceleration of a particle as seen from two frames S1 and S2 has equal magnitude 5 ms2.
  • The frames must be at rest with respect to each other.
  • The frames may be moving with respect to each other but neither should be accelerated with respect to the other.
  • The acceleration of frame S2 with respect to S1 be 0 or 10 ms2
  • The acceleration of frame S2 with respect to S1 lies between 0 and 10 ms2
A flower pot falls off a window sill and falls past the window below. It takes 0.5s to pass through a 2.0m high window. Find how high is the window sill from the top of the window?

133739.jpg
  • 10cm
  • 7.5cm
  • 11.25cm
  • 15cm
A body projected vertically upward with a velocity v at t=0 is found at a height h after 1 s and a further 6 s,  it is found at the same height (g=10 ms2). Then
  • h is 30 m
  • v is 40 ms1
  • maximum height is 80 m
  • distance moved in 5th second is 5 m
A particle is projected vertically upward with a speed u.
  • When it rises to half its maximum height its velocity is u2
  • Time taken to rise to half its maximum height is half the time taken to reach maximum height
  • Time taken to rise to three fourth its maximum height is half the time taken to reach maximum height
  • The acceleration of the particle when it reaches its maximum height is zero.
From the top of a tower, two stones whose masses are in the ratio 1:2 are thrown, one straight up with an initial speed u and the second straight down with same speed u. neglecting air resistance,
  • the heavier stone hits the ground with a higher speed
  • the lighter stone hits the ground with a higher speed
  • both the stones will have same speed when they hit the ground
  • the speed cannot be determined with the given data
A ball is thrown up with certain velocity so that it reaches a height h. Find the ratio of the times in which it is at h3.
  • 212+1
  • 323+2
  • 313+1
  • 13
Which of the following statements regarding motion of particle is true?

134005.PNG
  • The motion between A and B is known
  • The motion between A and B is erratic
  • The motion between A and B may have been steady or erratic
  • The motion between A and B is steady
Engine of a vehicle can give it an acceleration of 1ms2 and its brakes can retard it at 3ms1. The minimum time in which the vehicle can make a journey between stations A and B having a distance of 1200m is
  • 55.6s
  • 65.6s
  • 50.6s
  • 56.5s
An object may have
(I) varying speed without having varying velocity.
(II) varying velocity without having varying speed.
(III) non-zero acceleration without having varying velocity.
(IV) non-zero acceleration without having varying speed.
  • I and II are correct.
  • II and III are correct.
  • II and IV are correct.
  • None of the above.
A body travels 200 cm in the first two seconds and 220 cm in the next four seconds. What will be the velocity at the end of 7th second from the start?
  • 10 cms1
  • 20 cms1
  • 15 cms1
  • 5 cms1
A player throws a ball upwards with an initial speed of 29.4 ms1. The height to which the ball rises and the time taken to reach the player's hands are
  • 22.05 m,38 s
  • 44.1 m,6 s
  • 29.4 m,6 s
  • 54.5 m,9 s
A particle experiences a fixed acceleration for 6 seconds after starting from rest. It cover a distance of s1 in first two seconds, s2 in the next 2 seconds and s3 in the last 2 seconds then s3:s2:s1 is
  • 1:3:5
  • 5:3:1
  • 1:2:3
  • 4:3:2:1
0:0:6


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