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CBSE Questions for Class 11 Engineering Physics Motion In A Straight Line Quiz 4 - MCQExams.com

A stone is allowed to fall from the top of a tower and covers half the height of the tower in the last second of its journey. The time taken by the stone to reach the foot of the tower is
  • (22)s
  • 4s
  • (2+2)s
  • (2±2)s
A particle is thrown vertically upwards from ground. It takes time t1 to reach a height h. It continues to move and takes time t2 to reach the ground. Its maximum height is

134240.jpg
  • g2t1+t22
  • g2t12+t22
  • g8(t1+t2)2
  • g(t12+t22)
An aeroplane drops a parachutist. After covering a distance of 40 m, he opens the parachute and retards at 2 ms2. If he reaches the ground with a speed of 2 ms1, he remains in the air for about
  • 16 s
  • 3 s
  • 13 s
  • 10 s
A driver driving a truck at a constant speed of 20 ms1 suddenly saw a parked car ahead of him by 95 m. He could apply the brake after some time to produce retardation of 2.5 ms1.An accident was just avoided, his reaction time is

134243_af7cdb59e00a4bbb9e48f0ebfca268bf.png
  • 0.5 s
  • 0.75 s
  • 0.8 s
  • 1 s
After what time will he be able to overtake the bus?
  • 4sec
  • 8sec
  • 12sec
  • 16sec
A particle accelerates from rest at a constant rate for some time and attains a velocity of 8m/sec. Afterwards it decelerates with the constant rate and comes to rest. If the total time taken is 4sec, the distance travelled is
  • 32m
  • 16m
  • 4m
  • None of the above
Which one of the following represents the displacement time graph of two objects A and B moving with zero relative speed?
A particle experiences constant acceleration for 20 seconds after starting from rest. If it travels a distance s1 in the first 10 seconds and distance s2 in the next 10 seconds, then
  • s2=s1
  • s2=2s1
  • s2=3s1
  • s2=4s1
Free 238U nuclei kept in a train emit alpha particles. When the train is stationary and a uranium nucleus decays, a passenger measures that the separation between the alpha particles and the recoiling nucleus becomes x, in t time after the decay. If a decay takes places, when the train is moving at a uniform speed v, the distance between the alpha particle and the recoiling nucleus at a time t after the decay, as measured by the passenger will be  
  • x+vt
  • xvt
  • x
  • depends on the directions of the train
A soldier jumps out from an aeroplane with a parachute. After dropping through a distance of 19.6 m, he opens the parachute and decelerates at the rate of 1 ms2. If he reaches the ground with a speed of 4.6 ms1, how long was he in air?
  • 10 s
  • 12 s
  • 15 s
  • 17 s
A body of mass 3kg falls from the multi-storeyed building 100m high and buries itself 2m deep in the sand. The time of penetration is
  • 9sec
  • 0.9sec
  • 0.09sec
  • 10sec
Which of the following statements are true for a moving body?
  • If its speed changes, its velocity must change and it must have some acceleration.
  • If its velocity changes, its speed must change and it must have some directions.
  • If its velocity changes, its speed may or may not change, and it must have some acceleration.
  • If its speed changes but direction of motion does not change, its velocity may remain constant.
At t=0, an arrow is fired vertically upwards with a speed of 98ms1. A second arrow is fired vertically upwards with the same speed at t=5s. Then, (Take g=9.8ms2)
  • the arrows will be at the same height above the ground at t=12.5s.
  • the two arrows will reach back at their starting points at t=20s and t=25s.
  • the ratio of the speeds of the first and the second arrows at t=20s will be 2:1.
  • all are correct.
A stone is dropped into a well in which the level of water is h below the top of the well. If v is velocity of sound, the time T after which the splash is heard is given by
  • T=2hv
  • T=(2hg)+hv
  • T=(2hv)+hg
  • T=(h2g)+2hv
Figure shows the VT graph for two particles P and Q. The relative velocity of P w.r.t. Q is:
181028.png
  • is zero. 
  • is non-zero but constant
  • continuously decreases
  • continuously increases
A balloon starts rising from the ground with an acceleration of 1.25m/s2. After 8s, a stone is released from the balloon. The stone will (Taking g=10m/s2)
  • begin to move down after being released
  • reach the ground in 4 s
  • cover a distance of 40 m in reaching the ground
  • will have a displacement of 50 m
A body travels 2 m in the first two second and 2.20 m in the next 4 second with uniform deceleration. The velocity of the body at the end of 9 second is
  • 10 m/s
  • 0.20 m/s
  • 0.40 m/s
  • 0.80 m/s
A stone is just released from the window of a moving train moving along a horizontal straight track .When observed by a person on the ground,the stone will hit the ground following a
  • straight line path
  • circular path
  • parabolic path
  • hyperbolic path
A bomb is released from a horizontal flying aeroplane .The trajectory of bomb as observed from ground is
  • a parabola
  • a straight line
  • a circle
  • a hyperbola
A ball is thrown vertically upwards. It returns 6s later. Calculate:(i) the greatest height reached by the ball, and (ii) the initial velocity of the ball. (Take g=10ms2)
  • (i) 40 m, (ii) 30 m s1
  • (i) 45 m, (ii) 30 m s1
  • (i) 45 m, (ii) 60 m s1
  • (i) 45 m, (ii) 20 m s1
A ball is thrown from rear end of the compartment of train to the front end which is moving at a constant horizontal velocity. An observer A sitting in compartment and another observer B standing on the ground draw the trajectory. They will have
  • equal horizontal and equal vertical ranges.
  • equal vertical ranges but different horizontal ranges.
  • different vertical ranges but equal horizontal ranges.
  • different vertical ranges and different horizontal ranges.
A rocket is fired upward from the earth's surface such that it creates an acceleration of 19.6ms2. If after 5s, its engine is switched off, the maximum height of the rocket from earth's surface would be
  • 980 m
  • 735 m
  • 490 m
  • 245 m
From a 200m high tower, one ball is thrown upwards with speed of 10m/s and another is thrown vertically downwards at the same speed simultaneously. The time difference of their reaching the ground will be nearest to
  • 12s
  • 6s
  • 2s
  • 1s
A car starting from rest accelerates uniformly to acquire a speed 20 kmh1 in 30 min. The distance travelled by car in this time interval will be
  • 600 km
  • 5 km
  • 6 km
  • 10 km
  • Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
  • Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
  • Assertion is correct but Reason is incorrect
  • Both Assertion and Reason are incorrect
A particle starts to move in a straight line from a point with velocity 10ms1 and acceleration 2.0ms2. Find position(S) and velocity(v) of the particle at t=5 s
  • S=25m,v=0m/s
  • S=25m,v=0m/s
  • S=5m,v=10m/s
  • S=0m,v=0m/s
A body moves from rest with uniform acceleration and travels 270 m in 3 s. Find the velocity of the body at 10 s after the start.
  • 600ms1
  • 6ms1
  • 60ms1
  • 100ms1
A car travels a distance 100m with a constant acceleration and average velocity of 20 ms1. The final velocity acquired by the car is 25 ms1Find the initial velocity.
  • 15ms1
  • 10ms1
  • 30ms1
  • 0ms1
(a) How long will a stone take to fall to the ground from the top of a building 80m high and (b) what will be the velocity of the stone on reaching the ground? (Take g=10ms2)
  • (a) 14 s, (b) 30 m s1
  • (a) 4 s, (b) 30 m s1
  • (a) 10 s, (b) 40 m s1
  • (a) 4 s, (b) 40 m s1
A ball is thrown vertically upwards from the top of a tower with an initial velocity of 19.6ms1. The ball reaches the ground after 5s. Calculate :(i) the height of the tower, (ii) the velocity of ball on reaching the ground. Take g=9.8ms2.
  • (i)24.5m, (ii)29.4  m s1
  • (i)24.5m, (ii)19.4  m s1
  • (i)24.5m, (ii)28 m s1
  • (i)25m, (ii)29.4  m s1
The velocity of an object increases at a constant rate from 20ms1 to 50ms1in 10 s. Find the acceleration.
  • 3ms2
  • 30ms2
  • 30ms2
  • 3ms2
A ball is thrown vertically upwards with an initial velocity of 49ms1. Calculate: (i) the maximum height attained, (ii) the time taken by it before it reaches the ground again. (Take g=9.8ms2)
  • (i) 122.5 m, (ii) 10 s
  • (i) 120.5 m, (ii) 10 s
  • (i) 122.5 m, (ii) 20 s
  • (i) 120 m, (ii) 10 s
A boy on a cliff  49m high drops a stone.One second later,he throws a second after the first .They both hit the ground at the same time.With what speed did he throw the second stone?
  • 12.1m/s
  • 10m/s
  • 21.1m/s
  • 15.1m/s
A stone is thrown vertically upward with an initial velocity of 40ms1,Taking g=10ms2, find the maximum height reached by the stone.
  • 100m
  • 60m
  • 80m
  • 120m
The table below shows the speed of a moving vehicle with respect to time.
Speed (m/s)
2
4
6
8
10
Time (s)
1
2
3
4
5
Find the acceleration of the vehicle.
  • 2m/s2
  • 4m/s2
  • 6m/s2
  • 8m/s2
A ball is thrown vertically upwards with a velocity of 20ms1 from the top of a multi storey building.The height of the point where the ball is thrown 25 m from the ground.How long will it be before the ball hits the ground ? Take g=10ms2
  • t=5s
  • t=10s
  • t=15s
  • t=20s
A stone is thrown vertically upwards. When stone is at a height half of its maximum height, its speed is 10 m/s; then the maximum height attained by the stone is (g= 10 m/s2)
  • 25 m
  • 10 m
  • 15 m
  • 20 m
A car starts from rest and uniformly accelerates in a straight line. In the first second the car covers a distance of 2 m. The velocity of the car at the end of 2nd second will be
  • 4.0 ms1
  • 8.0 ms1
  • 6 ms1
  • None of these
A stone is allowed to fall from the top of a tower 100m high and at the same time another stone is projected vertically upwards from the ground with a velocity of 25ms1.Calculate where the two stones will meet.(Take g=10m/s2). 

  • 10 m
  • 40 m
  • 20 m
  • 50 m
An object is sliding down on an inclined plane. The velocity changes at a constant rate from 10 cm/s to 15 cm/s in 2 seconds. What is its acceleration?
  • 5cm/s2
  • 7.5cm/s2
  • 2.5cm/s2
  • 12.5cm/s2
If a car at rest accelerates uniformly to a speed of 144 km/h in 20 second, it covres a distance of :-
  • 20 m
  • 400 m
  • 1440 m
  • 2980 m
A ball thrown up vertically returns to the thrower after 6 s Find it's initial velocity.
  • 20 m/s
  • 40 m/s
  • 35 m/s
  • 30 m/s
The unit for the rate of change of velocity is 
  • ms2
  • ms3
  • ms1
  • m3s2
According to the following graph, what happens to the distance covered by the body from 0 -10 minutes?

266782.jpg
  • It goes on increasing
  • It goes on decreasing
  • It first increases and then decreases
  • It first decreases and then increases
A body starts from rest is moving under a constant acceleration up to 20 s . If it moves S1 Distance in first 10 s, and S2 distance in next 10 s then S2 will be equal to:
  • S1
  • 2S1
  • 3S1
  • 4S1
An aeroplane is flying in a horizontal direction at 600km/hr at a height of 6kms and is advancing towards a point which is exactly over a target on earth. At that instant the pilot releases a ball which on descending the earth strike the target. The falling ball appears-
  • To the pilot in the aeroplane, as falling along a parabolic path
  • To a person standing near the target, as falling exactly vertical
  • To a person standing near the target, as describing a parabolic path
  • To the pilot sitting in the aeroplane, as falling in a zigzag path
A particle travels 10 m in first 5 s, 10 m in next 3 s. Assuming constant acceleration, what is the distance traveled in the next two seconds.
  • 203 m
  • 20 m
  • 60 m
  • 180 m
A body travels 200 cm in the first two seconds and 220 cm in the next 4 s with same acceleration.The velocity of the body at the end of the 7th second is 
  • 5 cm/s
  • 10 cm/s
  • 15 cm/s
  • 20 cm/s
The distance between them at time t is:-
  • (200)2+(100)2m
  • (2004t)2+(1002t)2m
  • [(2004t)+(1002t)]m
  • (2002t)2+(1004t)2m
The rate of change of velocity of an object with respect to time is called ..........
  • Momentum
  • Displacement
  • Acceleration
  • Impulse
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