True or False 1. A speed of a moving object depends only on time taken in time.
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Answer:
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Answer:
2020 for Class 7 Science Chapter 14 - Motion And Time
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Textbook Solutions Class 7 Science Motion And Time
Living Science 2019 2020 Solutions for Class 7 Science Chapter 14 Motion And Time are provided here with simple step-by-step explanations. These solutions for Motion And Time are extremely popular among Class 7 students for Science Motion And Time Solutions come handy for quickly completing your homework and preparing for exams. All questions and answers from the Living Science 2019 2020 Book of Class 7 Science Chapter 14 are provided here for you for free. You will also love the ad-free experience on Meritnation’s Living Science 2019 2020 Solutions. All Living Science 2019 2020 Solutions for class Class 7 Science are prepared by experts and are 100% accurate.
Page No 161:
Question 1:
In the SI system, standard units for length, mass, time and temperature are fixed. What are these units?
ANSWER:
The SI unit for mass, length, time and temperature are as follows:
(i) Mass = Kilogram (kg)
(ii) Length = meter (m)
(iii) Time = second (s)
(iv) Temperature = Kelvin (K)
Page No 161:
Question 2:
Measuring time is more difficult than measuring length. Do you agree? Give reasons.
ANSWER:
No, measuring length is more difficult than measuring time. Because to measure time, we just need the time interval. i.e. the starting value and the end value of the time. But to measure the length, we need the actual path and the direction in which the length has to be measured. That's why it is more difficult to measure.
Page No 161:
Question 3:
The time period of a pendulum varies with its length. If the length is increased how does the time period change?
ANSWER:
The time period of a pendulum is directly proportional to the square root of the length of the pendulum. So, if the length increases, the time period of the pendulum increases accordingly.
Page No 164:
Question 1:
Speed of a moving object depends on two factors–distance moved and time taken. What is the relation between the three quantities–speed, distance moved and time taken?
ANSWER:
Speed of a moving object is given by the rate of change of distance travelled by the object. i.e. Speed = Distance travelledTime taken
Page No 164:
Question 2:
If a body travels in a straight line and covers equal distances in equal intervals of time, what kind of motion is it said to be in?
ANSWER:
If a body travels in a straight line and travels equal distances in equal intervals of time then the body is said to be in a uniform motion.
Page No 164:
Question 3:
For uniform motion, what kind of graph will you get if you plot distance vs time?
ANSWER:
In a uniform motion, a body travels equal distances in equal intervals of time. Hence, if we plot a graph between distance and time for uniform motion, the graph would be a straight line with a constant slope.