Class 7: Science Chapter 13 solutions. Complete Class 7 Science Chapter 13 Notes.
Contents
Lakhmir Singh Manjit Kaur Solutions for Class 8 Science : Chapter 13- Motion and Time
Lakhmir Singh Manjit Kaur 7th Science Chapter 13, Class 7 Science Chapter 13 solutions
(1) Ans:- M/S.
(2) Ans:- Km/Hr.
(3) Ans:- Speed.
(4) Ans:- Km/Hr.
(5) Ans:- (a) Odometer.
(b) Speedometer.
(6) Ans:- (a) False
(b) False
(c) True
(d) False
(e) True
(f) True
(g) False
(7) Ans:- Bar graph, Pie chart.
(8) Ans:- Time
(9) Ans:- Second.
(10) Ans:- Hour, Minute, Second.
(11) Ans:- 3600.
(12) Ans:- Sundial, Water clock.
(13) Ans:- Simple Pendulum.
(14) Ans:- Month, Day.
(15) Ans:- Bob.
(16) Ans:- Periodic Motion.
(17) Ans:- Quartz Crystal.
(18) Ans:- Clocks, Watches.
(19) Ans:- (a) 1 Second
(b) 1/10th Second.
(20) Ans:- Micro Second.
(21) Ans:- A quartz clock.
(22) Ans:- A quartz clock.
(23) Ans:- Speed = Distance covered / Time; 10m / 40 s = 0.25 m/s.
(24) Ans:- 0.2 hour.
(25) Ans:- An instrument on a vehicles dashboard which indicates the speed of the vehicle when it is running is called speedometer.
(26) Ans:- An instrument which is used for measuring the distance travelled by a vehicle.
(27) Ans:- when the object is stationary.
(28) Ans:- Speed of an object is the distance travelled by it in unit time.
(29) Ans:- Speed = Distance Covered / Time Taken.
(30) Fill in the blanks
Ans:- (a) Speed
(b) no-uniform
(c) uniform
(d) straight
(e) month
(f) day
(g) periodic
(h) simple pendulum
(i) time-period
Short Answer Type Question Solution:
(31) Ans:- (a) Periodic
(b) Rectilinear
(c) Periodic
(d) Periodic
(e) Rectilinear motion.
(32) Ans:- (a) A bar graph is a diagram which shows information as bars of different heights.
Example:- A bar graph showing the information about the runs scored in six overs of a cricket match.
(b) A pie chart is a kind of graph or diagram which shows the percentage composition of something in the form of slices of a circle.
Example: A pie chart showing the composition of air.
(33) Ans:- (a) Rectilinear motion.
(b) Circular motion
(c) Periodic motion
(d) Rectilinear motion
(e) Rotational motion.
(35) Ans:- The distance between Delhi and Amritsar is = Speed x Time Taken
=> 75 km/h x 6 h
=> 450 km.
(36) Ans:- Time taken = Distance Travelled / Speed
= 270 km / 60 km/hr
= 4.5 hr.
(37) Ans:- Distance Covered = 1 metre = 100 cm
Time taken = 10 second
Speed = 100 cm / 10 s = 10 cm/s
(38) Ans:- Speed = 120 km
Time taken = 1 minute
= 1 / 60 hr.
Distance Travelled = 120 x 1/ 60
= 2 km.
(39) Ans:- Speed = 45 km /h
Time taken = 20 minutes
= 20 / 60 = 1 / 3 h.
Distance Travelled = 45 x 1 / 3
= 15 km.
(40) Ans:- Total Distance = 240 km
Time taken = 4 hours
Speed = 240 km / 4 hr
= 60 km / hr.
(41) Ans:- Distance = 5 m 20 cm
= 500 + 20 = 520 cm
Time taken = 4 sec
Speed = Distance travelled / Time taken
= 520 cm / 4 sec = 130 cm/sec
(42) Ans:- Train speed = 60 km/hr
=60/60 km/min
=60/60×60 km/sec
=60×1000/60×60 m/sec
=16.66 m/sec.
(43) Ans:- Speed of the racing car=60m/s
1m =1/1000 km
1s 1/3600 h
Speed of car in km /h =(60×3600)÷1000
=216km/h
(44) Ans:- (a) Uniform motion.
(b) Non Uniform motion.
(45) Ans:- (a) Circular motion
(b) Rotational motion
(c) Periodic motion
(d) Periodic motion.
Long Answer Type Question Solution:
(46) Ans:- Uniform Motion:- an object moving along a straight line path is said to have uniform motion is its speed remains constant.
Example: The motion of a car running at a constant speed.
Non Uniform Motion:- An object moving along a straight line path is said to have non uniform motion if its speed keeps changing.
Example: The motion of a train starting from a railway station.
(50) Ans:- Simple Pendulum:- A simple pendulum consists of a small metal ball suspended by a long thread from a rigid support such that the bob is free to swing back and forth.
Time Period of a Simple Pendulum:- The time taken by pendulum bob to make one complete oscillation is called time period of the pendulum.
(b) Time taken for 20 complete oscillations = 36 s.
Time taken for 1 oscillation = 36 s / 20 = 1.8 s
Thus, the time period of this pendulum is 1.8 seconds.
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Lakhmir Singh Manjit Kaur Solutions for Class 7 Science: Chapter 13- Motion and Time
Download PDF: Lakhmir Singh Manjit Kaur Solutions for Class 7 Science: Chapter 13- Motion and Time PDF
Chapterwise Lakhmir Singh Manjit Kaur Solutions for Class 7 Science :
- Nutrition in Plants
- Nutrition in Animals
- Fibre to Fabric
- Heat
- Acids, Bases and Salts
- Physical and Chemical Changes
- Weather, Climate, And Adaptations of Animals to Climate
- Winds, Storms And Cyclones
- Soil
- Respiration in Organisms
- Transport in Animals and Plants
- Reproduction in Plants
- Motion and Time
- Electric Currents and Its Effects
- Light
- Water: A Precious Resource
- Forests: Our Lifeline
- Wastewater Story
About Lakhmir Singh Manjit Kaur
Students studying under the Central Board of Secondary Education find the textbooks of Lakhmir Singh and Manjit Kaur as one of their go-to textbooks for references. These books are designed based on the latest CBSE syllabus. Every concept that is explained in this textbook comes with supporting examples and problems that give students an opportunity to understand the application of formulas and equations.