A pulse travels through a slinky $6 m$ long from one end to the other end and then back again to the original position in $4 s$ . The velocity of the pulse in the slinky is

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Important Questions on Multiple-Choice Questions 1

MEDIUM

9th CBSE

IMPORTANT

LIVING SCIENCE PHYSICS 9>Chapter 7 - Multiple-Choice Questions 1>Multiple-Choice Questions (BASED ON PRACTICAL SKILLS IN SCIENCE)>Q 26

While doing the experiment on measuring the velocity of a pulse through a stretched string, a student had to choose between

(i) Thick silk string and a thick cotton string.

(ii) Stop clock and a table clock.

The combination of choice that he should prefer is

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE PHYSICS 9>Chapter 7 - Multiple-Choice Questions 1>Multiple-Choice Questions (BASED ON PRACTICAL SKILLS IN SCIENCE)>Q 27

Two slinkies A and B are of the same length and made up of two different materials. The time taken by

10

pulses to travel the same distance in both of them is

80

seconds and

70

seconds respectively. We can see that

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE PHYSICS 9>Chapter 7 - Multiple-Choice Questions 1>Multiple-Choice Questions (BASED ON PRACTICAL SKILLS IN SCIENCE)>Q 28

A pulse was created in a string/slinky of length

4 m

by a group of

4

students. They observed that it returned after reflection, at the point of creation,

6

times in

10

seconds. They calculated the speed as follows:

Student	A	B	C	D
Speed in $m / s$	$0.4$	$2.4$	$4.8$	$9.6$

The correct speed was calculated by the student.

EASY

9th CBSE

IMPORTANT

LIVING SCIENCE PHYSICS 9>Chapter 7 - Multiple-Choice Questions 1>Multiple-Choice Questions (BASED ON PRACTICAL SKILLS IN SCIENCE)>Q 29

A strong transverse horizontal pulse, created at one end of the string, is observed to complete $5$ single created journeys (from one end to the other end) along its length, before fading out. The initial and final readings, on a stopwatch used in the experiment, are shown here. If the length of string is $L$ metre, the speed of the pulse through the string is

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