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CBSE Questions for Class 11 Engineering Physics Motion In A Straight Line Quiz 9 - MCQExams.com

A train is at rest. It accelerates for a time t1 at a uniform rate α and the comes to rest under a uniform retardation rate β in time.t2. t1t2 is equal to 
  • βα
  • α+βα
  • α+ββ
  • αβ
A car accelerates from rest at a constant rate α for some time, after which it decelerates at a constant rate β and comes to rest. If the total time elapsed is t, then the maximum velocity acquired by car is 
  • (α2+β2αβ)t
  • (α2β2αβ)t
  • None of these
  • (αβrαβ)
Velocity at the top of vertical journey under gravity when a body is projected upward with velocity 1000m/s is 
  • Zero
  • 10m/s
  • 100m/s
  • 1000m/s
A particle starts with an initial velocity of 20m/s and moves with a constant acceleration on a straight line. If its final velocity is 60m/s, then velocity of midpoint is
  • 40m/s
  • 225m/s
  • 205m/s
  • 245m/s
If a body starts from rest,the time in which it covers a particular displacement with uniform acceleration 
  • inversely proportional to the square root of the displacement
  • inversely proportional to the displacement
  • diretily proportional to the displacement
  • directly proportional to the square root of the displacement
A particle travels 10m in first 5 seconds 10 cm in next 3 seconds. Assuming constant acceleration what is the distance travelled in next 2 second ?
  • 8.3 m
  • 9.3 m
  • 10.3 m
  • None of these
A body moving with uniform retardation covers 3 km before its speed is reduced to half of its initial value. It comes to rest in another distance of :
  • 1 km
  • 2 km
  • 3 km
  • 12km
A force of 20N is applied on a body of mass 5kg resting on a horizontal plane. The body gains a kinetic energy of 10joule after it moves a distance of 2m. The frictional force is:
  • 10N
  • 15N
  • 20N
  • 30N
A body starting from rest moves with constant acceleration. The ratio of distance covered by the body during the 5th sec to that covered in 5 sec is :
  • 9/25
  • 3/5
  • 25/9
  • 1/25
A block can slide on a smooth inclined plane of inclination 'q' kept on the floor of a lift. When the lift is descending with retardation, 'a' m/s2 the acceleration of the block relative to the incline will be:
  • (ga)sinq
  • (g+a)sinq
  • gsinq
  • ga
Two cars OF SAME LENGTH move in the same direction along parallel roads. One of them is a 100 m long travelling with a velocity of 7.5 ms1. How long will it take for the first car to overtake the second car?
  • 26 s
  • 40 s
  • 60 s
  • 80 s
A body is thrown with speed 20 m/s vertically upwards,if will return to thrower's hand after a time (g=10m/s2)
  • 2 s
  • 4 s
  • 20 s
  • Never
If a body loses half of its initial velocity on permenenting 2 cm in a wooden block, them how much it penetrate more before its velocity reduces to one fourth of its initial velocity [Assume retaradation of body in uniform ]
  • 2 cm
  • 1 cm
  • 0 . 5 cm
  • 4 cm
The splash of sound was heard 6s after dropping a stone into a well 125m deep. The velocity of sound is:
  • 350 cm/s
  • 125 m/s
  • 392 cm/s
  • 0 cm/s
A particle is thrown vertically up with speed u so that distance covered in last second of flight is 35 m . If  then initial speed of throw is 
  • 20m/s
  • 26.45m/s
  • 40m/s
  • 50m/s
A man runs at a speed of 4.0m/s to overtake a standing bus. When he is 6.0m behind the door (at t=0), then bus moves forward and continues with a constant acceleration of 1.2m/s2. The man shall access the door at time t equal to:
  • 5.2s
  • 4.3s
  • 2.3s
  • the man shall never gain the door
A car moving along a straight highway with a speed of 108 km/h, is brought to rest within a distance of 100 m. How long does it take for the car to stop?
  • 142s
  • 203s
  • 253s
  • 323s
A man drops a ball downside from the roof of a tower of height 400 meters. At then same time another ball is thrown upside with a velocity 50 m/sec from the base of the tower, then they will meet at which height from the base of the tower:  
  • 100 meters
  • 320 meters
  • 80 meters
  • 240 meters
A person crossing the a road with a certain velocity due north sees a car moving towards east. The velocity of the car with respect to the person is 2 times that of velocity of the person. The angle made by the relative velocity with the east  is 
  • 30
  • 45
  • 60
  • 90
Just after being hit, a baseball has a horizontal speed of 20 m/s and vertical speed of 25 m/s upward. Ignoring air resistance what are these speeds two seconds later?
  • 20 m/s horizontal and 5 m/s downward
  • 20 m/s horizontal and 5 m/s upward
  • 10 m/s horizontal and 5 m/s upward
  • 20 m/s horizontal and 45 m/s downward
A body of mass 2 Kg starts from rest and moves with uniform acceleration. It acquires a velocity 20 m/in 4s. The power exerted on the body in 2s in watts is:
  • 50 watt
  • 100 watt
  • 150 watt
  • 200 watt
A bullet moving with a speed of 100 ms1 can just penetrate two planks of equal thickness. Then the number of such planks penetrated by the same bullet when the speed is doubled will be:
  • 4
  • 8
  • 6
  • 10
A body is started from rest with acceleration 2m/s2 till it attains the maximum velocity then retard to rest with 3m/s2. If total time taken is 10 second then maximum speed attained is
  • 12 m/s
  • 8 m/s
  • 6 m/s
  • 4 m/s
A juggler maintains four balls in the air with air with throwing speed 20 m/s upwards in regular time intervals. When one ball is about to leave  his hand the height of balls in air from the ground will be:
  • 60m,80m,60m,0m
  • 30m,40m,30m,0m
  • 15m,20m,15m,0m
  • 10m,20m,10m,0m
A particle travels 10 m in the first 5 sec and 10 m in the next 3 sec. Assuming constant acceleration, what is the distance travelled in the next 2 sec?
  • 8.3 m
  • 9.3 m
  • 20 m
  • 16.6 m
A ship is moving due east with a velocity of 12 m/sec. A truck is moving across on the ship with a velocity of 4m/sec.A monkey is climbing a vertical pole mounted on the truck, with a velocity of 3m/sec. Find the velocity of the monkey, as observed by a man on the shore. (m/sec)
  • 10
  • 15
  • 13
  • 16
An aeroplane is in a level flight at 144km/hr at an altitude of 1000m. How far from a given target a bomb be released from it to hit the target ?(take g=10m/s2)
  • 566m
  • 671.43m
  • 471.34m
  • 371.34m
The two ends of train moving with constant acceleration pass a certain point with velocities u and 2 u. The velocity with which, the middle point of the train passes the same points is.
  • 2.5u
  • 1.5u
  • 5u
  • u
Acceleration of a body is given by dvdt=42v .The body started from rest t=Then 
  • The acceleration of the body is initially + ve but after some time it becomes negative
  • The body will ultimately acquire a constant velocity after a long time
  • The body will finally come rest
  • The acceleration will finally attain a constant non-zero value
An elevator is going down with a constant acceleration. A coin dropped from a point 1.8m above the elevator floor takes one second to reach the floor. The magnitude of the acceleration of the the elevator in ms2 is
Given:  g=10 ms2 
  • 3.6
  • 5
  • 7.2
  • 6.4
Water drops fall at regular intervals from a tap 5 m above ground. The 3 rd drop is leaving tap when first drop reaches ground. The distance of 2 nd drop at the instant is
  • 2.5 m
  • 3.75 m
  • 4 m
  • 1.25 m
A stone is released with acceleration 'a' from an upwardy moving left. Find out the acceleration and direction of the stone.
  • a in upward direction
  • (g+a) in downward direction
  • (g-a) in upward direction
  • g in downward direction
Particle is moving in a straight path with an acceleration a=btn, where b is a positive constant (n1). The relation between the velocity and the position vector of the particle at time t = 1s [Assuming particle is in rest at origin at t=0]
  • V=r
  • V=(n+2)r
  • V=(n+3)r2
  • V=(n+1)r2
A particle moves in a straight line with a constant acceleration. It changes its velocity from 10 m/s to 20  m/s while passing through a distance of 135 m in t seconds. The value of t is:-
  • 12
  • 9
  • 10
  • 1.8
A machine which is 75% efficient uses 12 joules of energy in lifting up a 1 kg mass through a certain distance. The mass is then allowed to fall through that distance. The velocity at the end of its fall is(in ms1):
  • 24
  • 32
  • 18
  • 9
A body travels 200 cm in the first two seconds and 220 cm in the next 4 seconds with same acceleration. The velocity of the body at the end of the 7th second is:
  • 10 cm/s
  • 5 cm/s
  • 12 cm/s
  • 2 cm/s
A body of mass 2 kg fall vertically, passing through two points A and B. The speeds of the body as it passes A and B are 1 m/s and 4 m/s respectively. The resistance against which the body falls is 9.6 N. What is the distance AB?
  • 2 m
  • 3 m
  • 6 m
  • 1.5 m
A ball, thrown by a boy, is caught by another boy in 2s. What is the maximum height attained by the ball?
  • 10 m
  • 5 m
  • 20 m
  • 7.5 m
A bus begins to move with an acceleration of 12m/s2. A person who is 40m behind the bus, runs at a rate of 7m/s. Find the time taken by the person to catch the bus.
  • 10
  • 20
  • 30
  • 40
 A ball is thrown upwards from the ground with an initial velocity u. The ball is at a height of 80m at two times. The time interval being 6s. Take g=10m/s2, the value of u is 
  • 100m/s
  • 80m/s
  • 50m/s
  • 30m/s
A laser gun of power 3mW and mass 50gm emits photons of wavelength 500nm. It is gravity frequency space and emits for one hour. Find the distance covered by gun due to recoil in this one hour (approx).
  • 1.3mm
  • 2.1μm
  • 1.1cm
  • 8.5mm
a ship of mass 3\times 10^{7} kg initially at rest is pulled by a force of 5\times 10^{4} N through a distance of 3 m. Assuming that the resistance due to water is negligible, what will be the speed of the ship ?
  • 0.1 m/s
  • 1.5 m/s
  • 5 m/s
  • 0.2 m/s
A parachutist after bailing  out falls 50 m without friction. When parachute opens, it decelerate at 2 m/s^2. He reaches the ground with a speed of 3 m/s. At what height, did he bail out nearly.
  • 298 m
  • 111 m
  • 91 m
  • 182 m
A body travelling with uniform acceleration crosses two points A and B with velocities 20\ m/sec and 30\ m/sec respectively then the speed of the body at mid point of A and B is
  • 25\ m/sec
  • 25.5\ m/sec
  • 24\ m/sec
  • 10\sqrt { 6 }\ m/sec
If you decide to launch a ball vertically to a friend located 45 m above you who  can catch it. What is the minimum launch speed you can use?
  • 4.5 m/s
  • 1.50 m/s
  • 45 m/s
  • 29.7 m/s
  • 90 m/s
A body is through 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 then
  • 1:1
  • 11:1
  • 1:2
  • 1:11
A particle falling from rest under gravity covers a distance x in 4\ s. If it continues falling then next 2\ x distance will be covered in approximately
  • 1.41\ s
  • 1.73\ s
  • 2.05\ s
  • 2.92\ s
A body is moving with velocity 1 m/s at a height 3 m from the ground. What will be its speed at height 2 m from the ground?
  • 4.54 m/s
  • 1 m/s
  • 6 m/s
  • 5.32 m/s
A stone is allowed to fall freely from rest. The ratio of the time taken to fall through the first meter and the second meter distance is :
  • \sqrt { 2 } - 1
  • \sqrt { 2 } + 1
  • \sqrt { 2 }
  • None of these
If a car at rest accelerates uniformly to a speed of 144 km/h in 20s , it covers a distance of 
  • 400 m
  • 1440 m
  • 2880 m
  • none of these
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