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Science 3 Marks Question

Motion and Time · Gujarat Board (GSEB) STD 7 (GSEB - English Medium). 12 questions.

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3 Marks Question

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Question 13 Marks

Complete the data of the table given below with the help of the distance-time graph given in figure.

Distance (m)

0

4

?

12

?

20

Time (s)

0

2

4

?

8

10

Image
Answer
This distance-time graph shows that the body is moving with a constant speed. It means that, it covers equal distance in equal interval of time. So, with the help of distance-time graph, the data can be completed as
Image
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Question 33 Marks
Starting from A, Paheli moves along a rectangular path ABCDas shown in figure. She takes 2 min to travel each side. Plot a distance-time graph and explain whether the motion is uniform or non-uniform.
Image
Answer
Since, the distance covered per unit time for the entire distance is not same so, the motion is a non-uniform motion.
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Question 43 Marks
The average age of children of class VII is 12 years and 3 months. Express his age in second.
Answer
Given, the average age of children 12 years and 3 months
$\begin{aligned} 1 \text { year } & =365 \text { days }=365 \times 24 h[1 \text { day }=24 h] \\ & =365 \times 24 \times 3600 s \quad[1 h=3600 s]\end{aligned}$
$\begin{aligned} 12 \text { years }=31536000 s & \times 12=378432000 s \\ 3 \text { months }=30 \times 3 \text { days } & =30 \times 3 \times 24 h \\ & =30 \times 3 \times 24 \times 3600 s \\ & =7776000 s\end{aligned}$
$\begin{aligned} \text { So, total age in second } & =378432000+7776000 \\ & =386208000 s\end{aligned}$
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Question 63 Marks
Last Sunday, Priyanka decided to go outside with her family for the dinner in some particular restaurant. Then, she thought to go through her own car. So, while moving she increased the speed of the car from 36 $km / h$ to 54 $km / h$.
All of sudden, a rickshaw came in front of her car but due to applying of brakes at the right time, both of them got safe from meeting with an accident.
(i) Calculate the increase in the speed of the car in the terms of $m / s$.
(ii) Mention a positive action performed by Priyanka here.
Answer

$\begin{aligned} \text {i.  Initial speed }=36 km / h & =\frac{5}{18} \times 36=10 m / s \\ \text { Final speed }=54 km / h & =\frac{5}{18} \times 54 \\ & =15 m / s \end{aligned}$
$\begin{aligned}\therefore \text { Increase in speed } & =\text { Final speed }- \text { Initial speed } \\ & =(15-10) m / s \\ & =5 m / s \end{aligned}$
ii. Priyanka applied the brakes at the right time while driving the car and prevented her family and the person on rickshaw from meeting with an accident.
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Question 73 Marks
Three students start running from the starting point at the same time. The picture shows the position of the students on the path after a minute.
Image
Which student ran the fastest? Explain your answer.
Answer
Student 3 ran the fastest as compared to other students because he covered maximum distance in same time.
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Question 83 Marks
The following figure shows the distance-time graph for the motion of two vehicles (Cand D). At what time and distance (from the starting point), they will cross each other?
Image
Answer
Firstly, draw perpendicular lines from point E on X-axis and Y-axis.
The two vehicles (C and D) will meet (or cross) each other at 5:00 PM after travelling a distance of $4 \frac{1}{2}$ km.
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Question 93 Marks
The following figure shows the distance-time graph for the motion of two objects D and E. Which one of them is moving slower?
Image
Answer
After studying the figure given above, E is moving slower as the slope of distance-time graph of E is less than that of graph D.
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Question 103 Marks
The following distance-time graph of three objects (D, E and F) are given (see figure given below). What can you say about the motion of the objects?
Image
Answer
Since, the distance-time graph of an object D is a straight line therefore, its motion is uniform.
Also here, we can see that the distance-time graph of object E is parallel to X-axis (time-axis), therefore object E is at rest.
As, the distance-time graph of object F is a curved line, therefore the object C is moving with a non-uniform speed and its motion is non-uniform.
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Question 113 Marks
One day, a five years old boy, Chintoo was playing with his toys in his room. After few minutes, he saw a wristwatch on his study table, so after seeing it, he got crazy and so much eager to play with that watch. Then, for 2 to 3 min, he was trying to analyse it that whether its a toy or something else, then suddenly, he was just about to throw it but at the same his mother entered into the room and took the watch back immediately from his hand.
(i) State the benefits of a wristwatch.
(ii) Briefly mention the values showed by Chintoo's mother here.
Answer
i. The wristwatch can be handled very easily to check the time in comparison to the wall clock.
ii. The values showed by Chintoo's mother here is the concern towards her four years old child and also the concern towards that wristwatch while considering the importance of money.
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Question 123 Marks
Differentiate between uniform and non-uniform motion.
Answer
When a body travels equal distance in an equal interval of time, then the body is said to be in uniform motion.
When a body travels unequal distance in an equal interval of time, then the body is said to be in non-uniform motion.
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