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**Kendriyavidyalayasangathan ZIET, BHUBANESWAR**

**Chapter8 ----MOTION**

**Answer the following by choosing the correct option**

**1 Rate of change of displacement is called**

a. Speed c. acceleration

b. Velocity d. deceleration

**2 Acceleration is a vector quantity, which indicates that its value**

a. Can be positive, negative or zero c. Is always positive

b. Is always negative d. Is zero

**3 A man travels a distance of 20 km from his home to office, and 10 km towards hishouse back. Then the displacement covered by the man in the whole trip is**

a. 30 km c. 10 km

b. zero km d. 50 km

**4 A farmer moves along the boundary of a square field of side 10 m in 40 sec.Themagnitude of displacement of the farmer at the end of 2 minutes 20 seconds from hisinitial position is**

a. 10m c. 40m

b. 30m d. 10√2m

**5 An object travels 20m in 5 sec and then another 40m in 5 sec. What is the averagespeed of the object?**

a. 12m/s c. 2m/s

b. 6m/s d. 0 m/s

**6 Formula to find the average velocity of a body is given by**

a. V= u+ at c. S= ut + ½ a t2

b. Sn ={u + a/2(2n-1)} d. Vav=(u + v)/2

**7 SI Unit of measurement of acceleration is**

a. m/s c. m/s2

b. m/hr d. M

**8 An example of a body moving with constant speed but still accelerating is**

a. A body moving with constantspeed in a circular path

c. A body moving with constant speed on a straight road

b. A body moving in a helical path with constant speed

d. A body moving with constantspeed on a straight railway track

**9 The acceleration of a body from a velocity –time graph is**

a. Equal to the slope of the graph c. Area under the graph

b. Is denoted by a line parallel to the time axis at any point on the distance axis

d. Is denoted by a line parallel to the distance axis at any point on the time axis

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