41. A brick is thrown vertically from an aircraft flying 2 km above the earth. The brick will fall with a
(a) constant speed.
(b) constant velocity.
(c) constant acceleration.
(d) constant speed for some time then with constant acceleration as it means the earth.
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42. A ball is thrown vertically upward from the ground with a speed of 25.2 m/s. The ball will reach the highest point of its journey in
(a) 5.14 s
(b) 3.57 s
(c) 2.57 s
(d) 1.29 s
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43. In a vacuum, a five-rupee coin a, feather of sparrow bird and a mango are dropped simultaneously from the same height. The time taken by them to reach the bottom is \(t_{1}\), \(t_{2}\) , and \(t_{3}\) respectively. In this situation, we will observe that
(a) \(t_{1}\)>\(t_{2}\)>\(t_{3}\)
(b) \(t_{1}\)>\(t_{3}\)>\(t_{2}\)
(c) \(t_{3}\)>\(t_{1}\)>\(t_{2}\)
(d) \(t_{1}\)=\(t_{2}\)=\(t_{3}\)
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44. If the distance-time graph is a curve then it represents ……….. .
(a) uniform speed
(b) constant displacement
(c) uniform momentum
(d) non-uniform speed
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45. The distance-time graph for the motion of an object moving with a constant speed is a
(a) dot
(b) circle
(c) straight line
(d) curve
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46. The slope of a distance-time graph shows ………….. .
(a) acceleration
(b) momentum
(c) mass
(d) speed
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47. The displacement-time (s-t) graph of a particle acted upon by a constant force is
(a) a straight line
(b) a circle
(c) a parabola
(d) any curve depending upon initial conditions
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48. If an object is at rest, then the time (X-axis) versus distance (Y-axis) graph
(a) is vertical
(b) is horizontal
(c) has 45° positive slope
(d) has 45° negative slope
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49. Going 50 m to the South of her house, Radhika turns left and goes another 20 m. Then turning to the North, she goes 30 m and then starts walking to her house. In which direction is she walking now?
(a) North
(b) South-East
(c) North-West
(d) West
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50. The angle in which a cricket ball should be hit to travel maximum horizontal distance is
(a) 60° with horizontal.
(b) 45° with horizontal.
(c) 30° with horizontal.
(d) 15° with horizontal.
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51. A ball is thrown upwards and it returns to ground describing a parabolic path. Which of the following remains constant?
(a) kinetic energy of the ball.
(b) speed of the ball.
(c) Horizontal component of velocity.
(d) Vertical component of velocity.
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52. A ball P is dropped vertically and another ball Q is thrown horizontally with the same velocities from the same height and at the same time. If air resistance is neglected, then
(a) ball P reaches the ground first.
(b) ball Q reaches the ground first.
(c) both reach the ground at the same time.
(d) the respective masses of the two balls will decide the time.
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