Answer the following question in brief
1. Give two example of periodic motion?
Ans: Motion of swing, Motion
of pendulum, Motion of the earth around the sun
2. Shamvavi height is is 1.75m .Expess in cm and
mm?
Ans: Shamvavi height is
is 1.75m =1.75x100cm=175cm =175x10mm=1750mm
3. The length of table is 4270mm.Express in cm
and m
Ans: 10mm =1cm Þ4270 m m = 4270/10=427cm
100cm = 1m Þ427cm =427/100m =0.427m
4. Why does foot step not used in standard unit
of length?
Ans: it is because foot step vary from person to person
5. While measuring the length of paper clip, the reading of the
scale at one end is 1.0 cm and on the other end is 4.7 cm. What is the length
of paper clip?
Ans: The length of the
needle = (4.7- 1.0) cm = 3.7 cm
6. The distance between main gate of red fort
and india gate is 4279m .Express in km?
Ans: 1000m = 1km Þ4279/1000 km=4.279km
7. Arrange the following length in increasing
order ; 1km;1mm;1cm;1m
Ans: length in
increasing order 1mm < 1cm < 1m < km
8. Roll a ball on ground. Identify the types of
motion?
Ans: A rolling ball
moves in straight line on ground is combination of Rectilinear and rotatory
motion.
9. Classify the following into different types
of motion:
a) The motion of man on
a straight road. b) The motion of wheels
of a car .
c) The motion of a
falling stone.
Ans: a) rectilinear
motion. b) circular motion. c) rectilinear
motion.
10. Give
an example for following types of motion:
1. Linear Motion. 2. Circular Motion.
3. Rotatory Motion.
Ans: 1. A moving carin a
straight line is an example of a linear motion.
2. Motion of blades of
fan is an example of circular motion.
3. Rotation of earth on
its axis is an example of rotatory motion.
Answer the
following question in detail
1. Discuss significance of measurement?
Ans:
measurement helps us to compare unknown quantity with known quantity. Measurement
helps us make quantitative statements about something like how big, how long, how
fast .
2. What are the different means of transport on land, air and water?
Ans:
The different means of transport on land are : train, Bus, Car,
The different
means of transport in air are : Aero planes , Gliders, Space ship
The different
means of transport on water are : Ships, Boats
3. What is the need of standard unit for measurements?
Ans:
For uniformity all over the world we need standard unit for measurements.
4. What is multiple motions. Explain?
Ans: The motion of a body some time may be
combination of two or more types of motion called multiple motion. For example :
Motion of earth around sun is Translatory motion where as Motion of earth on its axis is
rotatory motion.
5.How can you measure length
of a curved line?
(a) First of all we have to take a thread
(b) Now move the thread along the path of the
curved surface
(c) Mark the thread at the end point up to which
you want to measure the length
(d) Place the thread on the scale starting from
zero to the marked end point.
(e) Measure this length by the help of the scale
No comments:
Post a Comment