Class 9 - Science - CH 8 - Motion (MCQs)

Class 9 - Science - CH 8 - Motion (MCQs)

Motion

MCQs

Q1: A train moving with a uniform speed of 54 kmph. What is its speed in m/s?

(a) 15 m/s
(b) 1.5 m/s
(c) 9 m/s
(d) 90 m/s


Q2: A scalar quantity has ______________?

(a) magnitude only
(b) direction only
(c) both direction and magnitude
(d) none of these


Q3: When an object undergoes acceleration

(a) there is always an increase in its velocity
(b) there is always an increase in its speed
(c) a force always acting on it
(d) all of the above.




Q4: A truck covers 40 km with an average speed of 80km/h. Then it travels another 40 km with 
an average speed of 40 km/h. The average speed of the truck for the total distanced covered is:

(a) 40 km/h
(b) 45km/h
(c) 48km/h
(d) 53km/h


Q5: The SI unit of retardation is

(a) ms^-1
(b) ms^-2
(c) ms²
(d) m


Q6: A car starts from city A and it travels 50 km in a straight line to city B. Immediately it turns around, and returns to city A. It took 2 hours for this round trip. The average speed of the car for this round trip is:

(a) 0 km/h
(b) 25 km/h
(c) 50 km/h
(d) 100 km/h


Q7: The equation v = u + at gives information as
(a) velocity is a function of time.
(b) velocity is a function of position.
(c) Position is a function of time.
(d) Position is function of velocity and time.


Q8: Which of the following can determine the acceleration of a moving object? 

(a) area of velocity-time graph
(b) slope of velocity-time graph
(c) area of distance-time graph
(d) slope of the distance time-graph


Q9: A body is projected up with an initial velocity u m/s. It goes up to a height hmetres in t seconds time. Then it comes back at the point of projection. Considering negligible air resistance, which of the following statement is true?

(a) the acceleration is zero
(b) the displacement is zero
(c) the average velocity is 2h/t
(d) the final velocity is 2u when body reaches projection point.


Q10: A car accelerates at 1.5 m/s² in a straight road. How much is the increase in velocity in 4s?

(a) 6 m/s
(b) 4 m/s
(c) 3 m/s
(d) 2.66 m/s





 Answers:
1: (a) 15 m/s [Hint: 54×1000m/3600s = 15m/s]
2: (a) magnitude only
3: (c) a force always acting on it
4: (d) 53km/h
5: (b) ms^-2
6: (c) 50 km/h
7: (a) velocity is a function of time.
8: (b) slope of velocity-time graph
9: (b) the displacement is zero
10:  (a) 6 m/s  [Hint use v - u = at]