MCQ On Uniformly Accelerated Motion скачать в хорошем качестве

MCQ On Uniformly Accelerated Motion

Q1.A ball is thrown vertically downward with velocity of 20m/s from the top of tower. It hits the ground after some time with velocity of 80m/s. The height of the tower is (Take g = 10m/s2.) a)340m b) 320m c) 300m d) 360m Q2. A person sitting in the ground floor of a building notices through the window of height 1.5m, a ball dropped from the roof of the building crosses the window in 0.1 s. What is the velocity of the ball when it is at the topmost point of the window? ( g= 10m/s2) a)15.5m/s b) 14.5m/s c) 405m/s d) 20m/s Q3. A person travelling in s straight line moves with constant velocity v1 for certain distance x and with constant velocity v2 for next equal distance. The average velocity v is given by the relation Q4. Find the average velocity when a particle completes the circle of radius 1m in 10s. 2m/s b) 3.14m/s c) 6.28 m/s d) Zero. Q5. The speed of particle at 3rd and 8th second are 20m/s and zero respectively, then average acceleration between 3rd and 8th second will be 3m/s2 b) 4m/s2 c) 5m/s2 d) 6m/s2 Q6. A ball is thrown upward with speed u from a height h above the ground. The time taken by ball from the top when it return and hit the ground is √(2h/g) b) √(8h/g) c) √(u^2+2gh)/g d) u/g + √(2h/g) Q7. Which of the following statements is true for a car moving on the road? With respect to the frame of reference attached to the ground, the car is at rest. With respect to the frame of reference attached to the person sitting in the car, the car is at rest. With respect to the frame of reference attached to the person outside the car, the car is at rest. None of above. Q8.If the velocity of a particle is v = At + Bt2, where A and B are constants then the distance travelled by it between 1s to 2s is 3A + 7B b) 3A/2 + 7B/3 c) A/2 + B/3 d) 3A/2 + 4B Q9.The displacement- time graph of a particle is shown in figure. It indicates that The velocity of particle is constant throughout. The acceleration of particle is constant throughout. The particle starts with a constant velocity and is accelerated. The motion is retarded and finally the particle stops Q10. A body starts from rest and moves with constant acceleration for time t second. It travels a distance x1 in first half and x 2 in second half of time, then x1 = x 2 b) x 2 = 2 x1 c) x 2 = 3 x1 d) x 2 = 4 x1 Q11.The motion of a particle along a straight line is described by equation X = 8 + 12t – 3t3. Where, x is in metre and t in second. The retardation of the particle when its velocity becomes zero, is 24m/s2 b) zero c) 6m/s2 d) 12m/s2 Q12. A body is projected upwards with velocity 98m/s, after 4 s, a second body y is also projected with same initial velocity. Two bodies will meet after 8s b) 10s c) 12s d) 14s Q13.A balloon rises from rest with a constant acceleration g/8. A stone is released from it when it has risen to height h. The time taken by stone to reach the ground is 4√(h/g) b) 2√(h/g) c) √(2h/g) d) √(h/g) Q14.If a particle is thrown vertically upwards, then its velocity so that it covers same distance in 5th and 6th seconds would be 48m/s b) 14m/s c) 49m/s d) 7m/s Assertion and reason-based questions. Q15. Assertion: An object can have constant speed but variable velocity. Reason: Speed is a scalar but velocity is a vector quantity. A b) B c) C d) D Q16. Assertion: The position-time graph of uniform motion in one dimension of a body can have negative slope. Reason: When speed of body decreases with time, the position- time graph of the moving body has negative slope. A b) B c) C d) D Q17. Assertion: The v-t graph perpendicular to time axis is not possible in practice. Reason: Infinite acceleration can not be realised in practice. A b) B c) C d) D Q18. Assertion: The distance travelled in nth second has dimensions of velocity. Reason: Because it is distance travelled in one (particular) second. A b) B c) C d) D