## Motion in Straight Line

*Chapter Revision Test*

**Q1**. A railway train 400m long is going from New Delhi railway station to Kanpur. [1]

Can we consider railway train as a point object?

**Q2**. Shipra went from her home to school 2.5km away. On finding her home closed she [1]

returned to her home immediately. What is her net displacement? What is the total

distance covered by her?

**Q3**. Can speed of an object be negative? Justify [1]

**Q4**. What causes variation in velocity of a particle? [2]

**Q5**. Figure shown below shows displacement – time curves I and II. What conclusions do you draw from these graphs? [2]

**Q6**. Displacement of a particle is given by the expression x = 3t² + 7t – 9, where x is in [2]

meter and t is in seconds. What is acceleration?

**Q7**. A particle is thrown upwards. It attains a height (h) after 5 seconds and again after [2]

9s comes back. What is the speed of the particle at a height h?

**Q8**. A police jeep on a petrol duty on national highway was moving with a speed of [3]

54km/hr. in the same direction. It finds a thief rushing up in a car at a rate of

126km/hr in the same direction. Police sub – inspector fired at the car of the thief

with his service revolver with a muzzle speed of 100m/s. with what speed will the

bullet hit the car of thief?

**Q9**. Establish the relation S

_{nth}= u + ½a(2n − 1) where the letters have their usual [3]

**Q10**. A stone is dropped from the top of a cliff and is found to ravel 44.1m diving the last [3]

second before it reaches the ground. What is the height of the cliff? g = 9.8m/s²

meanings.