i. A body has translatory motion if it moves along a




... Answer is (a) straight line
 In Translatory or Translational motion, a body moves along a line without any rotation. The line may be straight or curved. For example, a car moving in a straight line has translational motion. Similarly, an aeroplane moves straight in translation motion.


ii. The motion of a body about its axis is called?




... Answer is (b) rotatory motion
 The spinning motion of a body about its axis is called rotatory motion. The motion of the wheel, the motion of a top, and the motion of the earth about its geographic axis that causes day and night are examples of rotatory motion.


iii. Which of the following is a vector quantity?




... Answer is (c) displacement
 Displacement is a vector quantity because it has both magnitude and direction. While speed, distance, and power are scalar quantities, having only magnitude and giving no information about direction.


iv. If an object is moving with constant speed then its distance-time graph will be a straight line.




... Answer is (d) Inclined to time-axis
 As distance = speed x time. And when speed is constant the straight line will pass diagonally from the origin which means it is inclined to the time axis.


v. A straight line parallel to the time-axis on a distance-time graph tells that the object is




... Answer is (b) at rest
 The object at rest means that the distance moved by the object with time is Zero. Thus a horizontal line parallel to the time axis on a distance-time graph shows the speed of the object is zero.


vi. The speed-time graph of a car is shown in the figure below, which of the following statements is true?





... Answer is (a) Car has an acceleration of 1.5 ms^-2
 As Acceleration = slope of the line of the given figure = v/t. Here, velocity v = 15 ms^-1, t=10s, Thus Acceleration "a" = 15 /10 = 1.5 ms^-2.


vii. Which of the following graph is representing uniform acceleration? :




... Answer is (a)
Figure (a) shows that the speed of an object is uniformly changing i.e speed changing at a constant rate. It means that the body is moving with uniform acceleration. So for uniform acceleration speed-time graph would be a straight line.


viii. By dividing the displacement of a moving body with time, we obtain




... Answer is (c) Velocity
 Velocity is the rate of change of displacement with time. Simple velocity equation: velocity = distance / time


ix. A ball is thrown vertically upward. Its velocity at the highest point is:




... Answer is (b) Zero
 When a ball is thrown vertically upward against the gravitational pull of the earth. the speed of the ball decreases gradually with time and at the highest point, it becomes zero because the ball comes to rest and then continues its downfall.


x. A change in position is called:




... Answer is (d) Distance
 Position means the location of a certain place or Object from a reference point. so the actual path length between two positions is called distance.


xi. A train is moving at a speed of 36 kmh^-1. Its speed expressed in ms^-1 is




... Answer is (a)  10 m/s
36 km/h (1 km = 1000 m & 1 h = 3600 s)= 36 x1000 m / 3600s =10 m/s.


xii. A car starts from rest. It acquires a speed of 25 ms^-1 after the 20s. The distance moved by car during this time is:




... Answer is (b)  250 m
Here we will solve this problem by Second's Equation of Motion S = Vit + (1/2) a t² for that we first to find Acceleration a = (Vf - Vi)/t = 1.25 m/s². Now by 2nd Eqn of Motion S = 250 m.



VIP Note: If you have Learned the above MCQs, then examine yourself by taking this Simple MCQS Quiz (Click here to play the Quiz)


 
Unit 2: Kinematics
⇑
9th Class MCQs Quizzes LIST

⇑
Unit 1   ⇚  9th Physics Content List   ⇛   Unit 3

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