NCERT republished not to be

1 MULTIPLE CHOICE distance between Delhi and Mumbai is usually expressedin units of(a)decametre(b)metre(c)centimetre(d) of the following does not express a time interval?(a)A day(b)A second(c)A school period(d)Time of the first bell in the shows a measuring scale which is usually suppliedwith a geometry box. Which of the following distance cannotbe measured with this scale by using it only once?Fig. (a) m(b) m(c) m(d) mMotion andMeasurement ofDistances1012/04/18 MMMMMOTIONOTIONOTIONOTIONOTION ANDANDANDANDAND M M M M MEASUREMENTEASUREMENTEASUREMENTEASUREMEN TEASUREMENT OFOFOFOFOF D D D D piece of ribbon folded five times is placed along a 30 cm longmeasuring scale as shown in Fig. length of the ribbon is between (a) m - m(b) m - m(c) m - m(d) m - moves on a straight road from point A to point C. Shetakes 20 minutes to cover a certain distance AB and 30 minutesto cover the rest of distance BC.

2 She then turns back andtakes 30 minutes to cover the distance CB and 20 minutes tocover the rest of the distance to her starting point. She makes5 rounds on the road the same way. Paheli concludes that hermotion is(a)only rectilinear motion.(b)only periodic motion.(c)rectilinear and periodic both.(d)neither rectilinear nor and Golu are playing in a ground. They start runningfrom the same point A in the ground and reach point B at thesame time by following the paths marked 1 and 2 respectivelyas shown in Fig. Which of the following is/are true forthe given P P P P PROBLEMSROBLEMSROBLEMSROBLEMSROBLEMSFig. compared to Golu, Bholu covers a(a)longer distance but with a lower speed.(b)longer distance with a higher speed.(c)shorter distance with a lower speed.(d)shorter distance with a higher pieces of wooden sticks A,B,C and D are placed along thelength of 30 cm long scale as shown in Fig. Which one ofthem is cm in length?

3 Fig. (a)A(b)B(c)C(d)D12/04/18 MMMMMOTIONOTIONOTIONOTIONOTION ANDANDANDANDAND M M M M MEASUREMENTEASUREMENTEASUREMENTEASUREMEN TEASUREMENT OFOFOFOFOF D D D D of the following figure shows the correct placement of ablock along a scale for measuring its length?(a)(b)(c)12/04/1860 EEEEEXEMPLARXEMPLARXEMPLARXEMPLARXEMPLAR P P P P PROBLEMSROBLEMSROBLEMSROBLEMSROBLEMS(d)F ig. are provided three scales A, B and C as shown in Fig. measure a length of 10 ANDANDANDANDAND M M M M MEASUREMENTEASUREMENTEASUREMENTEASUREMEN TEASUREMENT OFOFOFOFOF D D D D DISTANCESISTANCESISTANCESISTANCESISTANCE S61 For the correct measurement of the length you will use thescale(a)A only(b)B only.(c)C only.(d)Any of the three SHORT ANSWER the following.(i)The motion of a swing is an example of rectilinear motion.(ii)1m = 1000 in the blanks(i)Motion of an object or a part of it around a fixed point isknown as .. motion.(ii)A body repeating its motion after certain interval of timeis in.

4 Motion.(iii)In rectilinear motion, object a .. line.(iv)SI unit of length is .. one example for each of the following type of motion.(i)Rectilinear(ii)Circular(iii)Pe riodic(iv)Circular and periodic12/04/1862 EEEEEXEMPLARXEMPLARXEMPLARXEMPLARXEMPLAR P P P P PROBLEMSROBLEMSROBLEMSROBLEMSROBLEMSSHOR T ANSWER photograph given as Fig. shows a section of a grillemade up of straight and curved iron bars. How would youmeasure the length of the bars of this section, so that thepayment could be made to the contractor? the different types of motion in the following worddiagram given as Fig. children measure the length of a table which was about2 m. Each of them used different ways to measure it.(i)Sam measured it with a half metre long thread.(ii)Gurmeet measured it with a 15 cm scale from hergeometry ANDANDANDANDAND M M M M MEASUREMENTEASUREMENTEASUREMENTEASUREMEN TEASUREMENT OFOFOFOFOF D D D D DISTANCESISTANCESISTANCESISTANCESISTANCE S63(iii)Reena measured it using her hand span.

5 (iv)Salim measured it using a 5 m long measuring one of them would get the most accurate length? Givereason for your the events related to motion in Column I with the typesof motions given in Column (a)Amovingwheelofa(i)Circularmotionsewin gmachine(b)Movement of tip of thein one hour(c)A moving swing(iii) Periodic motionminute(ii)Rotational motionhand of a clockLONG ANSWER travelling in a train, it appears that the trees near thetrack are moving whereas co-passengers appear to bestationary. Explain the are the motions of a wheel of a moving bicycle and a markon the blade of a moving electric fan different? students measured the length of a corridor and reportedtheir measurements. The values of their measurements weredifferent. What could be the reason for difference in theirmeasurements? (Mention any three) was riding in his bicycle along a straight road. Heclassified the motion of various parts of the bicycle as (i)rectilinear motion, (ii) circular motion and (iii) both rectilinearas well as circular motion.

6 Can you list one part of the bicyclefor each type of motion? Support your answer with