144 + Interview Questions in MOTION-IN-ONE-DIMENSION IN GENERAL AWARENESS Page 3 InterviewSolution

101.	From the top of a tower, a particle is thrown vertically downwards with a velocity of `10 m//s`. The ratio of the distances, covered by it in the `3rd` and `2nd` seconds of the motion is `("Take" g = 10 m//s^2)`.A. `5: 7`B. `7: 5`C. `3: 6`D. `6:3`
Answer» Correct Answer - B

Discussion

102.	Figures (i) and (ii) below show the displacement-time graphs of two particles moving along the x -axis. We can say that A. Both the particles are having a uniformly accelerated motionB. Both the particles are having a uniformly retarded motionC. Particle (i) is having a uniformly accelerated motion while particle (ii) is having a uniformly retarded motionD. Particle (i) is having a uniformly retarded motion while particle (ii) is having a uniformly accelerated motion
Answer» Correct Answer - C

Discussion

103.	For the velocity time graph shown in Fig. 2 (CF).14, the distance covered by the body in last two seconds of its what fraction if the total distance covered by it in all the seven seconds? .A. `(1)/(2)`B. `(1)/(4)`C. `(1)/(3)`D. `(2)/(3)`
Answer» Correct Answer - B

Discussion

104.	A body is vertically upwards. If `t_(1)` and `t_(2)` are the times at which it is height h above the point of projection while ascending and descending, respectively, find (a) the velocity of projection and height h, (b) the maximum height reached by the body and (c ) the velocity of the body at height `h//2`.A. `g t_(1)`B. `g t_(2)`C. `g(t_(1)+t_(2))`D. `g(t_(1)+t_(2))/(2)`
Answer» Correct Answer - D

Discussion

105.	A particle of unit mass undergoes one-dimensional motion such that its velocity varies according to `v(x) = beta x^(-2 n)` where `beta` and `n` are constant and `x` is the position of the particle. The acceleration of the particle as a function of `x` is given by.A. `-2n beta^(2) x^(-2n-1)`B. `-2n beta^(2) x^(-4n-1)`C. `2 beta^(2) x^(-2n+1)`D. `-2n beta^(2) e^(-4n+1)`
Answer» Correct Answer - B

Discussion

106.	A train moves with a speed o f`30kmh^(-1)` in the first 15 minutes,with another speed of `40kmh^(-1)` the next 15 minutes,and then with a speed of `60 kmh^(-1)` in the last 30 minutes. Calculate the average speed of the train of train for this journey.
Answer» Correct Answer - `47 . 5 kmh ^(-1)`

Discussion

107.	Which of the following is a one-dimensional motion ?A. Landing of an aircraftB. Earth revolving a round the sunC. Motion of wheels of a moving trainsD. Train running on a straight track
Answer» Correct Answer - D

Discussion

108.	A train has a speed of `60 km//h` for the first one hour and `40 k/h` for the next half hour. Its average speed in `km//h` isA. 50B. `53.33`C. 48D. 70
Answer» Correct Answer - B

Discussion

109.	A man throws ball with the same speed vertically upwards one after the other at an interval of 2 seconds. What should be the speed of the throw so that more than two ball are in the sky at any time (Given `g=10(m)/(2^2)`)A. Any speed less than `19.6 m//s`B. Only with speed `19.6 m//s`C. More than `19.6 m//s`D. Al least `9.8 m//s`
Answer» Correct Answer - C

Discussion

110.	A particle moves along x-axis as `x=4(t-2)+a(t-2)^2` Which of the following is true?A. The initial velocity of particle is 4B. The acceleration of particle is 2 aC. The particle is at origin at t = 0D. None of these
Answer» Correct Answer - B

Discussion

111.	Three different objects of masses `m_(1) , m_(2)` and `m_(2)` are allowed to fall from rest and from the same point `O` along three different frictionless paths. The speeds of three objects on reaching the ground will be:A. `m_(1) : m_(2) : m_(3)`B. `m_(1) : 2m_(2) : 3m_(3)`C. `1:1:1`D. `(1)/(m_(1)):(1)/(m_(2)):(1)/(m_(3))`
Answer» Correct Answer - C

Discussion

112.	A body projected vertically upwards with a velocity u returns to the starting point in 4 seconds. If `g = 10m//sec`, the value of u isA. `5m//sec`B. `10m//sec`C. `15m//sec`D. `20m//sec`
Answer» Correct Answer - D

Discussion

113.	A Body moves 6m north, 8m east and 10m vertically upwards, what is its resultant displacement from initial positionA. `10 sqrt(2)m`B. `10m`C. `(10)/(sqrt(2))m`D. `10 xx 2m`
Answer» Correct Answer - A

Discussion

114.	If a ball is thrown vertically upwards with a velocity of `40m//s`, then velocity of the ball after `2s` will be `(g = 10m//s^(2))`A. `15m//s`B. `20 m//s`C. `25m//s`D. `28 m//s`
Answer» Correct Answer - B

Discussion

115.	A ball is thrown vertically upwards. Which of the following plots represent the speed graph of the ball during its flight if the air resistence is not ignored?A. B. C. D.
Answer» Correct Answer - C

Discussion

116.	two car A and B are moving with velocities of `60 kmh^(-1) and 45 kmh^(-1)` respectively. Calculate the relative velocity of A w.r.t B if (i) both cars are travelling eastwards and (ii)car A is travelling eastwards and car B is travelling westwards.
Answer» Correct Answer - ` (i) 15 kmh^(-1) ` eastwards (ii) `105 kmh ^(-1)` eastwards

Discussion

117.	two trains A and B,each of length 100 m, in length are running in opposite driection on parallel tracks with velocities ` 40 kmh ^(-1) and 32 kmh^(-1)` . In what time will they completely cross each other ?
Answer» Correct Answer - 10 s

Discussion

118.	A body falls from rest, its velocity at the end of first second is `(g = 32 ft//sec)`A. `16 ft//sec`B. `32 ft//sec`C. `64ft//sec`D. `24ft//sec`
Answer» Correct Answer - B

Discussion

119.	A body thrown with an initial speed of `96 ft//sec` reaches the ground after `(g = 32 ft//sec^(2))`A. 3secB. 6secC. 12secD. 8 sec
Answer» Correct Answer - B

Discussion

120.	A particle is constrained to move on a straight line path. It returns to the starting point after 10 sec . The total distance covered by the particle during this time is 30 m . Which of the following statements about the motion of the particle is falseA. Displacement of the particle is zeroB. Average speed of the particle is `3m//s`C. Displacement of the particle is 30mD. Both (a) and (b)
Answer» Correct Answer - C

Discussion

121.	The velocity-time graph of an object moving along a straight line is as shown in Fig. 3.37. Find the net distance covered by the object in time interval between t=0 to t=10s. Also find the displacement in time 0 to 10 s.
Answer» Correct Answer - 100m,60m

Discussion

122.	The initial velocity of a body moving along a straight lines is `7m//s`. It has a uniform acceleration of `4 m//s^(2)` the distance covered by the body in the `5^(th)` second of its motion is-A. 25 mB. 35 mC. 50mD. 85m
Answer» Correct Answer - A

Discussion

123.	A body falls from rest in the gravitational field of the earth. The distance travelled in the fifth second of its motion is `(g = 10m//s^(2))`A. 25mB. 45mC. 90 mD. 125m
Answer» Correct Answer - B

Discussion

124.	The motion of a particle is described by the equation at `u = at`.The distance travelled by the particle in the first 4 secondsA. 4aB. 12aC. 6aD. 8a
Answer» Correct Answer - D

Discussion

125.	A car travels the first half of a distance between two places at a speed of `30 km// hr` and the second half of the distance at `50 km//hr` . The average speed of the car for the whole journey isA. `42.5 km//hr`B. `40.0 km//hr`C. `36.5 km//hr`D. `35.0 km//hr`
Answer» Correct Answer - C

Discussion

126.	The displacement of a particle moving in a straight line, is given by `s = 2t^2 + 2t + 4` where `s` is in metres and `t` in seconds. The acceleration of the particle is.A. `2m//s`B. `4 m//s`C. `6m//s`D. `8m//s`
Answer» Correct Answer - B

Discussion

127.	A car travels half the distance with a constant velocity of `40 m//s` and the remaining half with a constant velocity of `60 m//s`. The average velocity of the car in `m//s` isA. 40B. 45C. 48D. 50
Answer» Correct Answer - C

Discussion

128.	(a) If a train traveling at `72 km//h` is to be brought to rest in a distance of `200 m`, find the deceleration. (b) The velocity of a bullet is reduced from `200 m//s` to `100 m//s` while traveling through a wooden block of thickness `10 cm`. Find the retardation (assuming it ti be uniform).A. `20 ms^(-2)`B. `10 ms^(-2)`C. `2 ms^(-2)`D. `1 ms^(-2)`
Answer» Correct Answer - D

Discussion

129.	A bullet going with speed 350 m/s enters concrete wall and penetrates a distance of 5.0 cm before coming to rest. Find the deceleration.A.B.C.D.
Answer» Correct Answer - `1.22 xx 10^(6) ms^(-2)`

Discussion

130.	A body has V, 2 2 and 3v in first 2/3 of distance S, second 1/3 of S and third 1/3 of s respectively. Its average speed wil beA. VB. 2VC. `(18)/(11)V`D. `(11)/(18)V`
Answer» Correct Answer - C

Discussion

131.	Assertion : The average and instantaneous velocities have same value in a uniform motion. Reason : In uniform motion, the velocity of an object increases uniformlyA. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false
Answer» Correct Answer - C

Discussion

132.	The motion of a particle is described by the equation `x = a+bt^(2)` where `a = 15` cm and `b = 3 cm//s`. Its instantaneous velocity at time 3 sec will beA. `36 cm//sec`B. `18 cm//sec`C. `16 cm//sec`D. `32 cm//sec`
Answer» Correct Answer - B

Discussion

133.	A body is projected up with a speed `u` and the time taken by it is T to reach the maximum height H. Pich out the correct statementA. It reaches `H//2` in `T//2` secB. It acquires velocity `u//2` in `T//2` secC. Its velocity is `u//2` at `H//2`D. same velocity at `2T`
Answer» Correct Answer - B

Discussion

134.	Statement I: A body can have acceleration even if its velocity is zero at a given instant . Statement II: A body is momentarily at rest when it reverses its direction of velocity.A. If both assertion and reason are true and the reason is the correct explanation of the assertion.B. If both assertion and reason are true but reason is not the correct explanation of the assertion.C. If assertion is true but reason is false.D. If the assertion and reason both are false
Answer» Correct Answer - A

Discussion

135.	An electron is emittied with a veloctiy of ` 5 xx 10 ^(6) ms^(-1)` . It is accelerated by an electric field in the direction of initial velocity at `3xx 10^(14) ms^(-2)` . If its final velocity is `7xx10^(6) ms^(-1)` calculation the distance coverd by the electron .
Answer» Correct Answer - 0.04 m

Discussion

136.	A particle moves along X-axis in such a way that its coordinate X varies with time t according to the equation `x = (2-5t +6t^(2))m`. The initial velocity of the particle isA. `-5m//s`B. `6m//s`C. `-3m//s`D. `3m//s`
Answer» Correct Answer - A

Discussion

137.	Three particles A, B and C are thrown from the top of a tower with the same speed. A is thrown up, B is thrown down and C is horizontally. They hit the ground with speeds `v_(A),v_(B) and v_(C)` respectively then,A. `V_(A) = V_(B) = V_(C)`B. `V_(A) = V_(B) gt V_(C)`C. `V_(B) gt V_(C) gt V_(A)`D. `V_(A) gt V_(B) = V_(C)`
Answer» Correct Answer - A

Discussion

138.	A body is thrown vertically upward with velocity `u`. The distance traveled by it in the fifth and the sixth second are equal. The velocity `u` is given byA. `24.5 m//s`B. `49.0 m//s`C. `73.5 m//s`D. `98.0 m//s`
Answer» Correct Answer - B

Discussion

139.	A parachutist after bailing out falls 50 m ,whitout friction. When the parachute opens he decelerates downwards at `2ms ^(-2)`. He reaches the ground with a speed of `3ms ^(-1)`. How long was the parachustintist in air ? At wht height did he ball out ?
Answer» Correct Answer - 17. 3 s 292 . 7 m

Discussion

140.	starting form rest a cars moves with unifrom acceleration and attians a velocity of `20 ms^(-1) and 4 s`. It then moves what a unifrom velocity of `20 ms^(-1)` for 6s. The brakes are applied and the car is brought to rest in 10s under unifrom retardation . Draw the velocity group for the motion. using theis graph , find (i) the acceleration of the car during the frist 4 s (ii) ua retardation during the last 10 s and (iii) the total distance traveled by the car .
Answer» Correct Answer - ` (i) 5 ms ^(-2) (ii) 2 ms ^(-2) ` (iii) 260 m

Discussion

141.	A train starte from rest and moves with a constant acceleration of `2ms^(-2)` for half a minute. The brakes are then applied and the train comes to rest in one minute.find (i) the maximum speed attained by the train (ii) the total distance moves by the train and (ii) the positions (s) of the train a half the maximum speed.
Answer» Correct Answer - `(i) 60 ms^(-1)` (ii) 2. 7 km (iii) 225 m and 2.25 km

Discussion

142.	An object of mass 10 kg is moving with an initial velocity of `10 m s^(-1)`. A constant force acts for 4 s on the object giving it a speed of 2 m `s^(-1)` in the opposite direction. Find the acceleration and force.A. `3m//sec^(2)`B. `-3m//sec^(2)`C. `0.3m//sec^(2)`D. `-0.3m//sec^(2)`
Answer» Correct Answer - B

Discussion

143.	A constant force acts on a body of mass 0.9 kg at rest for 10 s . If the body moves a distance of 250 m, the magnitude of the force isA. `3N`B. `3.5 N`C. `4.0N`D. `4.5N`
Answer» Correct Answer - D

Discussion

144.	A boat moves with speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h and having a width of 1 km. The minimum time taken around a round trip isA. 5 minB. 60 minC. 20 minD. 30 min
Answer» Correct Answer - D

Discussion

Explore topic-wise InterviewSolutions in .

From the top of a tower, a particle is thrown vertically downwards with a velocity of `10 m//s`. The ratio of the distances, covered by it in the `3rd` and `2nd` seconds of the motion is `("Take" g = 10 m//s^2)`.A. `5: 7`B. `7: 5`C. `3: 6`D. `6:3`

For the velocity time graph shown in Fig. 2 (CF).14, the distance covered by the body in last two seconds of its what fraction if the total distance covered by it in all the seven seconds? .A. `(1)/(2)`B. `(1)/(4)`C. `(1)/(3)`D. `(2)/(3)`

A train moves with a speed o f`30kmh^(-1)` in the first 15 minutes,with another speed of `40kmh^(-1)` the next 15 minutes,and then with a speed of `60 kmh^(-1)` in the last 30 minutes. Calculate the average speed of the train of train for this journey.

Which of the following is a one-dimensional motion ?A. Landing of an aircraftB. Earth revolving a round the sunC. Motion of wheels of a moving trainsD. Train running on a straight track

A train has a speed of `60 km//h` for the first one hour and `40 k/h` for the next half hour. Its average speed in `km//h` isA. 50B. `53.33`C. 48D. 70

A particle moves along x-axis as `x=4(t-2)+a(t-2)^2` Which of the following is true?A. The initial velocity of particle is 4B. The acceleration of particle is 2 aC. The particle is at origin at t = 0D. None of these

A body projected vertically upwards with a velocity u returns to the starting point in 4 seconds. If `g = 10m//sec`, the value of u isA. `5m//sec`B. `10m//sec`C. `15m//sec`D. `20m//sec`

A Body moves 6m north, 8m east and 10m vertically upwards, what is its resultant displacement from initial positionA. `10 sqrt(2)m`B. `10m`C. `(10)/(sqrt(2))m`D. `10 xx 2m`

If a ball is thrown vertically upwards with a velocity of `40m//s`, then velocity of the ball after `2s` will be `(g = 10m//s^(2))`A. `15m//s`B. `20 m//s`C. `25m//s`D. `28 m//s`

A ball is thrown vertically upwards. Which of the following plots represent the speed graph of the ball during its flight if the air resistence is not ignored?A. B. C. D.

two car A and B are moving with velocities of `60 kmh^(-1) and 45 kmh^(-1)` respectively. Calculate the relative velocity of A w.r.t B if (i) both cars are travelling eastwards and (ii)car A is travelling eastwards and car B is travelling westwards.

two trains A and B,each of length 100 m, in length are running in opposite driection on parallel tracks with velocities ` 40 kmh ^(-1) and 32 kmh^(-1)` . In what time will they completely cross each other ?

A body falls from rest, its velocity at the end of first second is `(g = 32 ft//sec)`A. `16 ft//sec`B. `32 ft//sec`C. `64ft//sec`D. `24ft//sec`

A body thrown with an initial speed of `96 ft//sec` reaches the ground after `(g = 32 ft//sec^(2))`A. 3secB. 6secC. 12secD. 8 sec

The velocity-time graph of an object moving along a straight line is as shown in Fig. 3.37. Find the net distance covered by the object in time interval between t=0 to t=10s. Also find the displacement in time 0 to 10 s.

The initial velocity of a body moving along a straight lines is `7m//s`. It has a uniform acceleration of `4 m//s^(2)` the distance covered by the body in the `5^(th)` second of its motion is-A. 25 mB. 35 mC. 50mD. 85m

A body falls from rest in the gravitational field of the earth. The distance travelled in the fifth second of its motion is `(g = 10m//s^(2))`A. 25mB. 45mC. 90 mD. 125m

The motion of a particle is described by the equation at `u = at`.The distance travelled by the particle in the first 4 secondsA. 4aB. 12aC. 6aD. 8a

A car travels the first half of a distance between two places at a speed of `30 km// hr` and the second half of the distance at `50 km//hr` . The average speed of the car for the whole journey isA. `42.5 km//hr`B. `40.0 km//hr`C. `36.5 km//hr`D. `35.0 km//hr`

The displacement of a particle moving in a straight line, is given by `s = 2t^2 + 2t + 4` where `s` is in metres and `t` in seconds. The acceleration of the particle is.A. `2m//s`B. `4 m//s`C. `6m//s`D. `8m//s`

A car travels half the distance with a constant velocity of `40 m//s` and the remaining half with a constant velocity of `60 m//s`. The average velocity of the car in `m//s` isA. 40B. 45C. 48D. 50

A bullet going with speed 350 m/s enters concrete wall and penetrates a distance of 5.0 cm before coming to rest. Find the deceleration.A.B.C.D.

A body has V, 2 2 and 3v in first 2/3 of distance S, second 1/3 of S and third 1/3 of s respectively. Its average speed wil beA. VB. 2VC. `(18)/(11)V`D. `(11)/(18)V`

The motion of a particle is described by the equation `x = a+bt^(2)` where `a = 15` cm and `b = 3 cm//s`. Its instantaneous velocity at time 3 sec will beA. `36 cm//sec`B. `18 cm//sec`C. `16 cm//sec`D. `32 cm//sec`

A body is projected up with a speed `u` and the time taken by it is T to reach the maximum height H. Pich out the correct statementA. It reaches `H//2` in `T//2` secB. It acquires velocity `u//2` in `T//2` secC. Its velocity is `u//2` at `H//2`D. same velocity at `2T`

An electron is emittied with a veloctiy of ` 5 xx 10 ^(6) ms^(-1)` . It is accelerated by an electric field in the direction of initial velocity at `3xx 10^(14) ms^(-2)` . If its final velocity is `7xx10^(6) ms^(-1)` calculation the distance coverd by the electron .

A particle moves along X-axis in such a way that its coordinate X varies with time t according to the equation `x = (2-5t +6t^(2))m`. The initial velocity of the particle isA. `-5m//s`B. `6m//s`C. `-3m//s`D. `3m//s`

A body is thrown vertically upward with velocity `u`. The distance traveled by it in the fifth and the sixth second are equal. The velocity `u` is given byA. `24.5 m//s`B. `49.0 m//s`C. `73.5 m//s`D. `98.0 m//s`

A parachutist after bailing out falls 50 m ,whitout friction. When the parachute opens he decelerates downwards at `2ms ^(-2)`. He reaches the ground with a speed of `3ms ^(-1)`. How long was the parachustintist in air ? At wht height did he ball out ?

An object of mass 10 kg is moving with an initial velocity of `10 m s^(-1)`. A constant force acts for 4 s on the object giving it a speed of 2 m `s^(-1)` in the opposite direction. Find the acceleration and force.A. `3m//sec^(2)`B. `-3m//sec^(2)`C. `0.3m//sec^(2)`D. `-0.3m//sec^(2)`

A constant force acts on a body of mass 0.9 kg at rest for 10 s . If the body moves a distance of 250 m, the magnitude of the force isA. `3N`B. `3.5 N`C. `4.0N`D. `4.5N`

A boat moves with speed of 5 km/h relative to water in a river flowing with a speed of 3 km/h and having a width of 1 km. The minimum time taken around a round trip isA. 5 minB. 60 minC. 20 minD. 30 min