Very Short Answer Type Question Solution:
(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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