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CBSE Questions for Class 11 Engineering Physics Motion In A Straight Line Quiz 7 - MCQExams.com

A car accelerates from rest at constant rate of 2m/s2  for some time. Then its retards at a constant rate of 4m/s2 and comes to rest. if it remains in motion for 3 seconds, then the maximum speed attained by the car is:-
  • 2m/s
  • 3m/s
  • 4m/s
  • 6m/s
 A particle is projected vertically upwards and it attains maximum height H. If the ratio of times to attain height h(h<H) is 1/3, then h equals
  • 2/3 H
  • 3H
  • 5/9. H
  • 3/. H
Two particles P and Q start from rest and move for equal time on a straight line. Particle P has an acceleration ofXm/s2 for the first half of the total time and 2xm/s2 for the second half. Particle Q has an acceleration of 2Xm/s2 for the first half of the total time and Xm/s2 for the second half. Which particle has covered larger distance?
  • Both have covered the same distance
  • P has covered the larger distance
  • Q has covered the larger distance
  • data insufficient
From the top of a tower, a stone is thrown up. It reaches the ground in 5 s. A second stone is thrown down with the same speed and reaches the ground in 1 s. A third stone is released from rest and reaches the ground in
  • s
  • s
  • 5 s
  • 2.5 s
A flowerpot falls from a windowsill 25.0m above the sidewalk. How fast is the flowerpot moving when it strikes the ground? (in m/s)
  • 22
  • 23
  • 26
  • 25
What is the total height reached by the stone? (in m)
  • 36
  • 35
  • 34.44
  • 39
Maximum height. (in m)
  • 20
  • 40
  • 60
  • 80
An astronaut jumps from an airplane. After he had fallen 40m, then his parachute opens. Now he falls with a retardation of 2m/s2 and reaches the earth with a velocity of 3.0m/s. What was the height of the aeroplane? (in m)
  • 185
  • 190
  • 234
  • 200
A car starts from rest and accelerates uniformly to a speed of 180kmh1 in 10 sec. The distance covered by the car in the time interval is :
  • 200m
  • 300m
  • 500m
  • 250m
Two stones of mass m1 and m2 (such that m1 and m2 ) are dropped t time apart from the same height towards the ground. At a  later time t the difference in their speed is V and their mutual separation is S . While both stones are in flight 
  • V decreases with time and S increases with time.
  • V and S increases with time.
  • V remains constant time and S decreases with time.
  • V remains constant time and S increases with time.
A particle moves along the x-axis with a position given by the equation x=5+3t, where x is in meters, and t is in seconds. The positive direction is east. Which of the following statements about the particle is false?
  • The particle is east of the origin at t=0
  • The particle is at rest at t=0
  • The particle's velocity is constant
  • The particle's acceleration is constant
A car moving with a velocity of 20ms1 is stopped in a distance of 40m. If the same car is travelling at double the velocity, the distance travelled by it for same retardation is
  • 640m
  • 320m
  • 1280m
  • 160m
A body travelling along a straight line one-third of the total distance with a velocity 4m/s. The remaining part of the distance was covered with a velocity 2m/s for the first half of the remaining journey and with a velocity 6m/s for the another half of the remaining journey. The average velocity is 
  • 5m/s
  • 4m/s
  • 4.5m/s
  • 3.5m/s
A juggler tosses a ball up in the air with initial speed u. At the instant it reaches its maximum height H, he tosses up a second ball with the same initial speed. The two balls will collide at a height
  • H4
  • H2
  • 3H4
  • 34H
A particle moving in one dimension with a constant acceleration of 2m/s2 is observed to cover a distance of 5m during a particular interval of 1s. The distance covered by the particle in the next 1s interval is in metre
  • 5
  • 6
  • 7
  • 10
In a car race, car A takes a time t less than car B at the finish and passes the finishing point with speed v more than that of the car B. Assuming that both the cars starts from rest and travel with constant accelerations a1 and a2 respectively. So, the value of v will be :
  • (a1/a2)t
  • (a2/a1)t
  • (a1a2)t
  • (a1a2)t
A car is moving along a straight road with a uniform acceleration. It passes through two points P and Q separated by a distance, with velocity 30 km/hr and 40 km/hr respectively. The velocity of the car midway between P and Q is
  • 35.35 km/hr
  • 23.3 km/hr
  • 2832km/hr
  • none of these.
A body X is projected upwards with a velocity of 98 ms1, after 4s, a second body Y is also projected upwards with the same Y is also projected upwards with the same initial velocity. Two bodies will meet after
  • 8 s
  • 10 s
  • 12 s
  • 14 s
A man of mass 60kg and a boy of mass 30kg are standing together on frictionless ice surface. If they push each other apart man moves away with a speed of 0.4m/s relative to ice. After 5sec they will be away from each other at a distance of.
  • 9.0m
  • 3.0m
  • 6.0m
  • 30,
If the distance travel by a uniformly accelerated particle in pth,qt and rth second are a,b and c respectively. Then
  • (qr)a+(rp)b+(pq)c=1
  • (qr)a+(rp)b+(pq)c=1
  • (qr)a+(rp)b+(pq)c=0
  • (q+r)a+(r+p)b+(p+q)c=0
If a coin is dropped in a lift it takes t1 time to reach the floor and takes t2 time when lift is moving up with constant acceleration, when which one of the following relation is correct?
  • t1=t2
  • t1>t2
  • t2>t1
  • t1>>t2
A body starts from rest acquires a velocity v in time T. The work done on the body in timet will be proportional to
  • (V2T2)t2
  • (V2T2)t
  • (V2T)t2
  • (VT)t2
A man weighing 80 kg is standing on a trolley weighing 320 kg. The trolley is resting on frictionless horizontal rails. If the man starts walking on the trolley along the rails at speed 1 m/s. Then after 4 s, his displacement relative to ground will be :
  • 4.5 m
  • 5 m
  • 8 m
  • 3.2 m
Initial speed of an alpha particle side a tube a length 4 m is 1 km/s, if it is accelerated in the tube and comes out with a speed of 9 km/s, then the time for which the particle remains inside the tube is
  • 8×103s
  • 8×104s
  • 80×103s
  • 800×103s
The time required to stop a car of mass 800 kg moving at a speed of 20 ms1 over a distance of 25 m is
  • 2 s
  • 2.5 s
  • 4 s
  • 4.5 s
  • 1 s
A body freely falling from the rest has a velocity v after his falls through a height h. The distance, it has to fall down further for its velocity to become double, is :
  • 4 h
  • 3h
  • h
  • 16h
The driver of an express train suddenly sees the red light signal 50 m ahead and applies the brakes .If the average deceleration during braking is 10.0ms2 and the reaction time of the driver is 0.75 sec , the minimum speed at which the train should be moving so as not to cross the red signal is 
  • 27 km/hr
  • 144 km/hr
  • 72 km/hr
  • 83 km/hr
Three particles A,B and C are thrown from the top of a tower with the same speed. A is thrown straight up, B is thrown straight down and C is thrown horizontally. They hit the ground with speed vA,vB and vC respectively.
  • vA=vB=vC
  • vA>vB>vC
  • vA=vB>vC
  • vA>vB=vC
The deceleration of a car traveling on a straight highway is a function of its instantaneous velocity v given by w=av, where a is a constant. If the initial velocity of the car is vo, the distance the car will travel and the time it takes before it stops are
  • 23mv3/2o,12v3/2os
  • 32amv1/2o,12av1/2os
  • 3a2mv1/2o,a2v3/2os
  • 23amv3/2o,2av1/2os
A ball thrown upward from the top of a tower with speed v reaches the ground in t1 second. If this ball is thrown downward from the top of the same tower with speed v it reaches the ground in t2 second. In what time the ball shall reach the ground if it is allowed to fall freely under gravity from the top of the tower?
  • t1+t22
  • t1t22
  • t1t2
  • t1+t2
A 20 kg bullet pierces through a plate of mass M1=1 kg and then comes to rest inside a second plate of mass M2=2.98 kg as shown in the figure. It is found that the two plates initially at rest and now move with equal velocities. Find the percentage loss in the initial velocity of the bullet when it is between M1 and M2. (Neglect any loss of material of the plates due to the action of bullet).
713920_49d8c7ef62774e6da7f6d39d88a73de7.png
  • 6%
  • 25%
  • 50%
  • 72.5%
A body falling from a high Minaret travels 40m in the last 2 seconds of its fall to ground. Height of Minaret in metres is
(take g=10m/s2)
  • 60
  • 45
  • 80
  • 50
The speed of a car is reduced from 90 km/hr to 36 km/hr in 5 s. What is the distance travelled by the car during this time interval.
  • 87.5 m
  • 90 m
  • 50 m
  • 100 m
A particle is found to be at rest when seen from a frame S1 and moving with a constant velocity when seen from another frame S2. Mark out the possible options.
  • Both the frames are inertal
  • S1 is inertial and S2 is noninertial
  • S1 is noninertial and S2 is inerital
  • none of these
A particle is thrown upwards from ground. It experiences a constant resistance force which can produce retardation 2m/s2. The ratio of time of ascent to the time of descent is (g=10m/s2)
  • 1:1
  • 23
  • 23
  • 32
Rana moves with uniform velocity on a bike. He throws a stone in air, the stone falls:
  • Back in his hands
  • In front of him
  • At the back of him
  • Cannot be predicted
A car and bike start racing in a straight line. The distance of finish line from starting line is 100m. The minimum acceleration of car to win, if it accelerates uniformly starting from rest and the bike moves with a constant velocity of 10 m/s, is
  • 0.5m/s2
  • 2m/s2
  • 1m/s2
  • 3m/s2
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 ms2)
  • 2.5 ms1
  • 5 ms1
  • 10 ms1
  • 20 ms1
 Two bodies begin a free fall from the same height at a time interval of N seconds. If vertical separation between the two bodies is 1 m after n seconds from the start of the first body, then n is equal to
  • nN
  • 1gN
  • 1gN+N2
  • 1gNN4
A car is moving with speed 27km/h. The driver applied brakes as he approaches a circular turn on the road of radius 80m and his speed reduces at the constant rate of 0.50m/s every second. The magnitude of net acceleration is
  • 20ms2
  • 0.86ms2
  • 100ms2
  • None of these
A juggler throws balls into air. He throws one when ever the previous one is at its highest point. If he throws n balls each second, the height to which each ball will rise is:
  • g2n2
  • 2gn2
  • 2gn
  • g4n2
A body A starts from rest with an acceleration a1. After 2 seconds, another body B starts from rest with an acceleration a2. If they travel equal distances in the 5th second, after the start of A, then the ratio a1 : a2 is equal to
  • 5:9
  • 5:7
  • 9:5
  • 9:7
A lift is coming from 8th floor and is just about to reach 4th floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct?
  • x < 0, v < 0, a > 0
  • x > 0, v < 0, a < 0
  • x > 0, v < 0, a > 0
  • x < 0, v < 0, a = 0
A and B start walking towards each other from the opposite ends of a 15 km long straight road, at a speed of 5 km/hr and 7 km/hr respectively. How far apart will they be after one hour?
  • 2 km
  • 3 km
  • 5 km
  • 7 km
On a long horizontally moving belt, a child runs to and fro with a speed 9 km h1 (with respect to the belt) between his father and mother located 50 m apart on the moving belt. The belt moves with a speed of 4 km h1. For an observer on a stationary platform, the speed of the child running in the direction of motion of the belt is
  • 4 km h1
  • 5 km h1
  • 9 km h1
  • 13 km h1
A tall cylinder is filled with viscous oil. A round pebble is dropped from the top with zero initial velocity. From the plots shown in figure, indicate the one that represents the velocity (v) of the pebble as a function of time (t).
A body covers a distance of 4 m in 3rd second and 12 m in 5th second. If the motion is uniformly accelerated, how far will it travel in the next 3 seconds?
  • 10 m
  • 30 m
  • 40 m
  • 60 m
A body starts from rest and moves with constant acceleration for t s. It travels a distance x1 in first half of time and x2 in next half of time, then
  • x2=3x1
  • x2=x1
  • x2=4x1
  • x2=2x1
A rocket of initial mass 6000 kg eject gases at a constant rate of 16 kgs1 with constant relative speed of 11 kms1. What is the acceleration of rocket one minute after the blast?
  • 25ms2
  • 50ms2
  • 10ms2
  • 35ms2
Which of the following statements is incorrect ?
  • In one dimension motion, the velocity and the acceleration of an object are always along the same line.
  • In two or three dimensions, the angle between velocity and acceleration vectors may have any value between 0and 180
  • The kinematic equations for uniform acceleration can be applied in case of uniform circular motion.
  • The resultant acceleration of an object in circular motion is towards the centre only if the speed is constant.
0:0:2


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