# NCERT Physics Class 11 Exemplar Ch 3 Motion in a Straight Line Part 1 (For CBSE, ICSE, IAS, NET, NRA 2022)

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## Multiple Choice Questions

Q. 1 Among the four graphs (Fig. 3.1) , there is only one graph for which average velocity over the time interval can vanish for a suitably chosen T. Which one is it?

(a)

(b)

(c)

(d)

Answer: b

Q. 2 A lift is coming from 8^{th} floor and is just about to reach 4^{th} floor. Taking ground floor as origin and positive direction upwards for all quantities, which one of the following is correct?

(a)

(b)

(c)

(d)

Answer: a

Q. 3 In one dimensional motion, instantaneous speed v satisfies

(a) The displacement in time T must always take non-negative values.

(b) The displacement x in time T satisfies

(c) The acceleration is always a non-negative number.

(d) The motion has no turning points

Answer: b

Q. 4 A vehicle travels half the distance L with speed and the other half with speed V2, then its average speed is

(a)

(b)

(c)

(d)

Answer: c

Q. 5 The displacement of a particle is given by where x is in metres and t in seconds. The distance covered by the particle in first 4 seconds is

(a) 4 m

(b) 8 m

(c) 12 m

(d) 16 m

Answer: b

Q. 6 At a metro station, a girl walks up a stationary escalator in time t 1 . If she remains stationary on the escalator, then the escalator take her up in time . The time taken by her to walk up on the moving escalator will be

(a)

(b)

(c)

(d)

Answer: c