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JEE Questions for Physics Motion In A Straight Line Quiz 3 - MCQExams.com
JEE
Physics
Motion In A Straight Line
Quiz 3
A car moves from X to Y with a uniform speed v
u
and returns to Y with a uniform speed v
d
. The average speed for this round trip is
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0%
0%
2)
0%
0%
A body of mass 10 kg is moving with a constant velocity of 10 ms
-1
. When a constant force acts for 4 s on it, it moves with a velocity 2 ms
-1
in the opposite direction. The acceleration produced in it is
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0%
3 ms-1
0%
-3 ms-1
0%
0.3 ms-1
0%
-0.3 ms-1
A particle moves along a straight line OX. At a time t (in second) the distance x (in metre) of the particle from O is given by x = 40 + 12t – t
3
. How long would the particle travel before coming to rest?
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0%
24 m
0%
40 m
0%
56 m
0%
16 m
A bullet comes out of the barrel of gun of length 2 m with a speed ms
-1
. The average acceleration of the bullet is
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0%
1.6 ms-2
0%
160 ms-2
0%
1600 ms-2
0%
16 ms-2
A body is moving with uniform acceleration covers 200 m in the first 2 s and 220 m in the next 4 s. Find the velocity in ms
-1
after 7 s.
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0%
10
0%
15
0%
20
0%
30
From the top of tower a body A is projected vertically up, another body B is horizontally thrown and a third body C is thrown vertically down with same velocity. Then,
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B strikes the ground with more velocity
0%
C strikes the ground with less velocity
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A, B and C strike the ground with same velocity
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A and C strike the ground with more velocity than B
A body is released from a great height, falls freely towards the earth. Another body is released from the same height exactly a second later. Then, the separation between two bodies, 2 s after the release of the second body is nearly
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0%
15 m
0%
20 m
0%
25 m
0%
30 m
A particle moving with a uniform acceleration travels 24 m and 64 m in the first two consecutive interval of 4 s each. Its initial velocity will be
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0%
5 ms-1
0%
3 ms-1
0%
4 ms-1
0%
1 ms-1
A source of constant voltage V is connected to a resistance R and two ideal inductors L
1
and L
2
through a switch S as shown. There is no mutual inductance between the two inductors. The switch S is initially open. At t = 0, the switch is closed and current begins to flow. Which of the following options is/are correct?
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0%
0%
2)
0%
The ratio of the currents through L1 and L2 is fixed at all times (t > 0)
0%
An automobile travelling with a speed of 60 kmh
-1
, can brake to stop within a distance of 20 m. If the car is going twice as fast, i.e. 120 kmh
-1
, the stopping distance will be
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0%
20 m
0%
40 m
0%
60 m
0%
80 m
A particle located at x = 0 at time t = 0, starts moving along the positive x–direction with a velocity v that varies as v = α√x. The displacement of the particle varies with time as
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0%
0%
t
0%
0%
A metro train starts from rest and in 5 s achieves 108 kmh
-1
. After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation. If total distance travelled is 395 m, find total time of travelling.
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0%
12.2 s
0%
15.3 s
0%
9 s
0%
17.2 s
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0%
0%
2)
0%
0%
Zero
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0%
0%
2)
0%
0%
A bullet moving with a speed of 100 ms
-1
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
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0%
6
0%
10
0%
4
0%
8
A balloon is rising vertically up with a velocity of 29 ms
-1
. A stone is dropped from it and it reaches the ground in 10 s. The height of the balloon when the stone was dropped from it is ( take,g = 9.8 ms
-2
)
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0%
400 m
0%
150 m
0%
100 m
0%
200 m
From the top of a tower, two stones, whose masses are in the ratio 1 : 2 are thrown on straight up with an initial speed u and the second straight down with the same speed u. Then, neglecting air resistance
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the heavier stone hits the ground with a higher speed
0%
the lighter stone hits the ground with a higher speed
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both the stones will have the same speed when they hit the ground
0%
the speed cannot be determined with the given data
From a balloon rising vertically upwards 5 ms
-1
at stone is thrown up at 10 ms
-1
relative to the balloon. Its velocity w.r.t. ground after 2 s is (assume, g = 10 ms
-2
)
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0%
zero
0%
-5 ms-1
0%
10 ms-1
0%
20 ms-1
A balloon going upward with a velocity of 12 ms
-1
is at a height of 65 m from the earth's surface at any instant. Exactly at this instant a ball drops from it. How much time will the ball take in reaching the surface of the earth? (Take, g = 10 ms
-2
)
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0%
5 s
0%
6 s
0%
10 s
0%
None of these
A body dropped from top of a tower fall through 60 m during the last 2s of its fall. The height of tower is (take,g = 10 ms
-2
)
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95 m
0%
60 m
0%
80 m
0%
90 m
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0%
2)
0%
0%
A car starting from rest, accelerates at the rate a through a distance s, then continues at constant speed for time t and then decelerates at the rate a/2 to come to rest. If the total distance travelled is 15 s, then
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s = at
0%
2)
0%
0%
None of these
A parachutist after bailing out falls 50 m without friction. When parachute opens, it decelerates at 2 ms
-2
. He reaches the ground with a speed of 3 ms
-1
. At what height, did he bail out ?
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91 m
0%
182 m
0%
293 m
0%
111m
A car is travelling at 72 kmh
-1
and is 20 m from a barrier when the driver puts on the brakes. The car hits the barrier 2 s later. What is the magnitude of the constant deceleration?
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0%
7.2 ms-2
0%
10 ms-2
0%
36 ms-2
0%
15 ms-2
The area under acceleration-time graph gives
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0%
distance in travelled
0%
change in acceleration
0%
force acting
0%
change in velocity
A man is 45 m behind the bus, when the bus starts accelerating from rest with acceleration 2.5 ms
-2
. With what minimum velocity should the man start running to catch the bus?
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0%
12 ms-1
0%
14 ms-1
0%
15 ms-1
0%
16 ms-1
A particle moves along X–axis as x = 4(t –+ a (t – 2)
2
. Which of the following is true?
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0%
The initial velocity of particle is 4
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The acceleration of particle is 2a
0%
The particle is at origin at t = 0
0%
None of these
A particle moving in a straight line covers half the distance with speed of 3 m/s. The other half of the distance is covered in two equal time intervals with speed of 4.5 m/s and 7.5 m/s, respectively. The average speed of particle during this motion is
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0%
4 m/s
0%
5 m/s
0%
5.5 m/s
0%
4.8 m/s
A cyclist starts from the centre 0 of a circular park of radius 1km, reaches the edge P of the park, then cycle along the circumference and returns to the point 0 as shown in figure. If the round trip takes 10 min, the net displacement and average speed of the cyclist (in metre and kilometre per hour) are
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0%
0 , 1
0%
2)
0%
0%
0 , 21.4
0%
0 , 24.14
A rocket is moving in a gravity free space with a constant acceleration of 2 ms
-2
along + x-direction (see figure). The length of a chamber inside the rocket is 4 m. A ball is thrown from the left end of the chamber in + x-direction with a speed of 0.3 m/s relative to the rocket. At the same time, another ball is thrown in - x-direction with a speed of 0.2 m/s from its right end relative to the rocket. The time (in seconds) when the two balls will hit each other is
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2 or 8
0%
3
0%
6
0%
9
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