11. A bus travels at a speed of 50 km/h to go from its origin of its destination at a distance of 300 km and travels at a speed of 60 km/h to return to the origin. What is the average speed of the bus?
(a) 54.55 km/h
(b) 55 km/h
(c) 55.55 km/h
(d) 54 km/h
View Answer
12. The speed of a particle or any instant of time is called its
(a) instantaneous speed
(b) instantaneous velocity
(c) displacement
(d) None of the above
View Answer
13. The rate of change of displacement with time is called as …… .
(a) force
(b) acceleration
(c) retardation
(d) velocity
View Answer
14. The SI unit of velocity is
(a) m/sec
(b) m/\(sec^{2}\)
(c) km/\(sec^{2}\)
(d) m/\(min^{2}\)
View Answer
15. During …………. motion of an object along a straight line, the change in velocity of the object for any time interval is zero.
(a) linear
(b) translational
(c) equilibrium
(d) uniform
View Answer
16. Average velocity of an object
(a) is a scalar quantity.
(b) may be positive: zero or negative.
(c) is always positive.
(d) cannot be zero.
View Answer
17. A car starts from Bengaluru, goes 50 km in a straight line towards South, immediately turns around and returns to Bengaluru. The time taken for this round trip is 2h. The magnitude of the average velocity of the car for this round trip
(a) is zero
(b) is 50 km/h
(c) is 25km/h
(d) cannot be calculated without knowing acceleration
View Answer
18. The speedometer of the car do not show its
(a) instantaneous velocity
(b) instantaneous speed
(c) average velocity
(d) Both (a) and (c)
View Answer
19. Consider the following statements.
I. For a moving particle, distance can never be negative or zero while displacement can be.
II. The rate of displacement with time is called speed.
III. For a moving body the average velocity can never be negative or zero.
Which of the statements given above is/are correct?
(a) I, II and III
(b) I and III
(c) Only I
(d) II and III
View Answer
20. Assertion (A) The speedometer of an automobile measure the average speed of the automobile.
Reason (R) Average velocity is equal to total displacement per total time taken.
Codes
(a) Both A and R are true and R is the correct explanation of A
(b) Both A and R are true, but R is not the correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
View Answer