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Chapter-01 Motion and
Time
Let us revise
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Motion: A body Is said to be
in motion if its position changed continuously with respect to the
surroundings or with respect to an observer with passage of time
Eg: A flying bird, Hands of a clock, Motions of fly when attracted to sugar;
etc.
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There are three types of motion
1. Rectilinear Motion 2.
Circular Motion 3.
Periodic Motion
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Distance : The distance travelled by a body is the actual length of
the path covered by moving body irrespective of the direction in which the
body moves
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Types of Motion:
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Rectilinear Motion: If an
object moves along a straight line then the motion is rectilinear.
Eg: motion of vehicle on a straight road,
March past of soldiers in a parade
Falling of a stone.
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Circular Motion: In this
type of motion an object moves in such a way that its distance from a fixed
point remains constant.
i.e Whirling motion of a stone tied to a thread
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Periodic Motion: If the
object repeats its motion after some fixed interval of time the n the motion is
called periodic motion.
Eg. Motion of a pendulum of clock
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General awareness:
1. Metric System was first created and followed
by___________
a) USA b)
Britain c) France d) Germany
2. Metric system was first created in the year______
a) 1780 AD b)
1790 AD c) 1760
AD d) 1850 AD
3. System having a set of standard units of measurement has
been accepted all over the word and is called________
a) International system of units b) S.I. System of Units c) Metric system of Units d) A and B
4. In the S.I. System of units the unit of length is_____
a) Metre b)
Kilometre c)
Centimetre d) All of
these
5. Select the unit of length that is used to measure the
distance of stars from the earth.
a) Metre b)
Kilometre c) Light
Years d) All of these
Ex.1. Write the type of motion involved in the following
action
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S.No
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Example of Motion
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Type of Motion involved
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Check correct answer
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1
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A car moving on straight road
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2
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Blades of a ceiling fan in motion
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3
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Motion of a child on a see-saw
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4
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Motion of a spinning top
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5
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Motion of hammer on an electric Bell
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6
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Motion of a motor-Cyclist in a ‘Death Wall”
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7
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Motion of the earth around the sun
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8
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Motion of a pendulum
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9
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Soldiers in a march past
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10
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Motion of a beam of light
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Ex.2. Directions:
Read the following questions and tick the best answer:-
1. A marathon runner runs at an average speed of 14 km/h.
How long would it take him to complete a Marathon of 42 km?
a) 2
hours b) 3 hours c) 14 hours d) 4.2 hours
2. Which of the following does not measure time?
a) Sundial b)
Pendulum c) Calendar d) Ruler
3. Which of the following statements is correct about
‘Average Speed” of a motorist on a journey?
a) It is the total distance travelled divided by the total
time.
b) It is the average of the fastest and slowest speed.
c) It is the average of his initial and final speeds
d) It is the total time divided by total distance travelled.
4. A particle is travelling with a constant speed. Which of
the following statements is correct?
a) Its velocity is also constant b) It covers equal distances in equal time
intervals
c) Its acceleration is zero d)
It does not change its direction of motion
5. A person, seated in a train under motion is at rest with
reference to
a) a person watching him from the seat opposite to him b) A
person watching him from the ground.
c) Trees on the ground d)
A car moving in an opposite direction to the train
6. Which of these is/are an example of Rectilinear Motion?
a) Falling of a stone from a height b) A moving bus on a straight Road
c) Both the above d)
None of the above
7, Spinning of TOP
illustrates ______________Motion.
a) Rectilinear b)
Circular c)
Rotatory d) None
of these
8. Symbol used for writing metre is____________
9.The instrument used to record the distance travelled by a
vehicle is_______
10. Which of the following is used to record the time most
accurately?
a) Pendulum Clock b)
Quartz watch c)
Watch with balance wheel d) All of
them
Ex.3. Complete the following statements with an appropriate
word/ term to be filled in the blank space(s)
1) The SI unit of time is______________
2) A motion that repeats again and Again is
called_____________
3. The distance time graph of a uniform motion is a curve
(True / False)
4. During non-uniform motion, the position of a body does
not change with respect to the reference pt.
5. Distance between two cities is measured in Kilometers.
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ANSWERS TO TYPE OF
MOTION WORKSHEET
Measurements
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1.
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C
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France
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2
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B
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1790 AD
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3
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B
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S.I. System of Units
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4
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A
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Metre
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5
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C
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Light year is a Unit of length that measures the distance of starts
from Earth.
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Ex.1. Write the type
of motion involved in the following action
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S.No
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Example of Motion
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Type of Motion involved
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Check correct answer
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1
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A car moving on straight road
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Rectilinear
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2
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Blades of a ceiling fan in
motion
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Periodic
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3
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Motion of a child on a see-saw
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Periodic
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4
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Motion of a spinning top
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Circular and Periodic
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5
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Motion of hammer on an
electric Bell
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Periodic
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6
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Motion of a motor-Cyclist in a
‘Death Wall”
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Circular and Periodic
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7
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Motion of the earth around the
sun
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Periodic
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8
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Motion of a pendulum
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Periodic
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9
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Soldiers in a march past
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Periodic and Rectilinear
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10
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Motion of a beam of light
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Rectilinear
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Ex 2
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1
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3 hours
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2
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D
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Ruler
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3
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A -Average
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Total distance/ time taken
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4
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B- It covers equal distances in equal time
intervals
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5
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A- a person watching him from the seat opposite to
him
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6
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C
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Both of the above
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7
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C
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Rotatory
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8
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m
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9
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Odometer
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10
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B
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Quartz watch
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Ex 3
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1
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Second
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2
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Periodic Motion
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3
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False
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4- False
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5- True
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Chapter – Light.
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Important points to remember
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Light helps us to see objects.
Light is an agent which produces in us a sensation of sight.
Various objects that given out
light of their own are torch, bulb, sun, electric light etc. These are known
as LUMINOUS OBJECTS.
Non-Luminous Body is that
substance which does not emit light itself e.g: Chair, table, etc
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We can see the non-luminous
objects when the Light
(From Luminous Objects) falls
on them and then travels towards our eyes.
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Translucent Body It is a
body through which light can pass partially.
We can see through such objects but not clearly. E.g. oily paper, fog,
smokes, etc.
Transparent Body:- It is a
body through which light can pass easily.
We can see through such objects clearly. E.g: Glass, water, air . Some
plastics.
Opaque Body: The body that does not allow any light to pass through
it is called opaque.
e.g; wood, steel, brick, sheet of aluminum
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Shadow is formed when an
opaque object comes in the path of light.
Light travels in straight
lines.
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For formation of a shadow we
need (i) a source of light, (ii) An opaque object and (iii) a Screen
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A shadow can be seen only on a
SCREEN.
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Exercise
Directions: The
following questions have four choices, out of which only one is correct. Choose
the correct alternative.
1. Which is a
non-luminous body?
a) Sun b)
Moon c) Stars d) all of these
2. Which of the following is Translucent?
a) Oily Paper b)
Aluminum Sheet c) Glass d) None of
these
3. If an object placed in the path of light allows almost
whole of the light falling on it to pass through it, then the object is_______.
a) Transparent b)
Translucent c) Opaque d) None of these
4. A shining STAR is
________________
a) A natural source of light b)
an artificial source of light c) A
luminous body d) Both A and C
5. Select the objects that use reflection of light:
a) A mirror on the dressing table b) Side Mirror c)
Periscope d) All of the above
6. In a pin hole camera, the image formed is____
a) Erect b)
Inverted c)
Smaller d)
Larger
7. Which of the following are needed for formations of a
shadow?
a) Source of light b)
An opaque object c) Screen d) All of these
8. A student was asked to observe the night sky and note
down the objects observed by him in his note book. He listed the following:-
(i) Stars (ii)
Moon (iii)
Clouds
From amongst the above the sources of light in night sky
are__________
a) (i) Only b)
(ii) only c) (iii) Only d) (i) and (ii)
9. Periscope, a devise used in submarine makes use of___
a) Refection of light b)
Refraction of Light
c) Shadow formation by Opaque objects d) None of these
10. Image formed on water is____
a) Erect b)
Inverted c) Larger d) None of these
11. A Solar Cell converts_______________
a) Chemical Energy to Light Energy b) Light Energy to Electrical Energy
c) Electrical Energy to Light Energy d) Light Energy to Chemical Energy
12. How long, to the nearest minute, does it take for light from
the Sun to reach the Earth?
a) 7 Minutes b)
8.3 Minutes c) 8 Minutes d) 7 Minutes
13. A substance which radiates light when heated to a high
temperature is said to be
a) Luminescent b)
Incandescent c)
Fluorescent d)
Phosphorescent
14. Air is not visible because it
a) is nearly a perfectly transparent substance b) Neither absorbs nor reflects
c) Transmits whole light d)
All the above are correct
15. To an astronaut the outer space appears
_________________in colour.
16. Which of the following statements is correct about
Virtual image?
a) It can be formed on a screen but cannot be seen b) It cannot be formed on a screen
c) It can be formed on a screen but is inverted d) It can only be formed with
a concave mirror
17. If we mix light of all the colours of the rainbow, we
will get____
a) Pink light b)
Brown light c)
Colourless light d) Black
Light
18. When Sun light falls on a Red Rose, it appears Red
because____
a) It is red rose b)
It absorbs Red Colour of the light and reflects the remaining colours.
c) Rose reflects Red colour and absorbs the remaining
colours of the light
d) The wavelength of the red light increases after being
reflected from the rose, while the wavelengths of remaining colours remain the
same.
Q.19. The image in a plan mirror is
I) Real, II)
Upright
III) The same size as the Object IV) As far
behind the mirror as the object is in front of it.
a) I only b)
I, II and III Only c)
II, III and IV only d) All of
these
Q.20.Diffused reflection takes place when light is reflected
from a /an
a) Convex Mirror b)
Irregular surface c) Plane Mirror d) Polished Surface
Ex. 2. Fill in the
blanks:
21. A reflecting surface which curves_________ is concave
mirror
22. Breaking of white light into seven colour is
called___________of light.
23. __________Image is an image that is upright as compared
to object
24. Any highly polished surface can act as a
____________
25. _______ mirrors are used as reflectors at street
corners.
Answers to Chapter LIGHT
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1.
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B
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Moon is a non-luminous satellite of Earth. It becomes visible
when light from the sun falls on it.
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2
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A
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(of a substance) allowing light, but not detailed shapes,
to pass through; semi-transparent.
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3
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A
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(of a material or article) allowing light to pass through
so that objects behind can be distinctly seen
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4
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D
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Both A and C
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5
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D
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All of the above
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6
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B
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The image in a pinhole camera is
inverted (upside down) as compared to the object.
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7
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D
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All of these
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8
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A
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(i) only
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9
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A
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Refection
of light
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10
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A
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Erect
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11
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B
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A solar cell, or photovoltaic cell, is an
electrical device that converts the
energy of light directly into electricity by the photovoltaic effect,
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12
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C
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8 Minutes
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13
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A
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Luminescent
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14
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D
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All the above are correct
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15
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B
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Black- . As there is no atmosphere in space, astronauts see
the actual colour of sky I.e black
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16
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B
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It cannot be formed on a screen
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17
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C
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18
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C
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19
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C
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) II, III and IV only
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20
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B
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Ex
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2
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21
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Inward
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22
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Dispersion
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23
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Erect
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24
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Mirror
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25
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Convex
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Worksheet -02 Electricity
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Important Points to remember
Electricity:-
Electricity is the presence and flow of electric
charge (electrons) in one direction. ... It is a form of energy which we use
to power machines and electrical devices. When electrical charges are not
moving, electricity is called static electricity.
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Electric Cell is a source of electricity. Such cells are used in
alarm clocks, wrist watches, Cell phone, etc.,
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Electric conductors: Materials that allow electric current to pass
through them are called conductors of electricity e.g. metal wires, coins,
iron keys, aluminum foil, sewing needle, lead of lead pencils
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Insulator: Such materials do not allow electric current to pass
through them are called insulators. E.g; air, cork, rubber, wooden block,
thermocol, papers. Etc.,
Insulators are sued for covering electrical wires, plug tops,
switches and other parts of electrical
appliances
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A conduction tester is used to test whether any material allows
current to pass through it.
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Ex-1.
1. Choose the best conductor of Electricity.
a) Silver b)
Copper c) Iron d) lead
2. Which one the following is the best insulator?
a) Paper b)
Lead Pencil c) Rubber d) Thermocol
3. Name the cells in human body which look like electric
wire?
a) Arteries b)
Veins c)
Neurons d) All of
these
4. Electric heaters used for cooking have the filament or
the heating coil on plate made up of clay because
a) Clay can be molded in any shape b) Clay is a bad conductor of Electricity
c) Both (a) and (b) d)
None of these
5. The main function of a switch is to
a) Allow charges to flow b)
Complete or break a circuit
c) Make the bulb glow easily d)
Prevent electric shocks
6. Two like charges
a) Repel each other b) First Repel then attract
c) First attract then
repel d)
attract each other
7. The electric current is
produced due to
a)
Flow of Electrons b)
Flow of Protons
c)
Flow of Positive and negative charges d)
Vibration of atoms
8.
Which of the following is the best conductor of electricity?
a)
Ordinary water b) Sea
water c) Boiled water d) Distilled water
9.
Safety wire used in electrical circuits, is made of a material having
a)
Low melting point b) High
melting point c) High resistance d) None of these
10.
Which one of the following cells is rechargeable?
a)
Daniell cell b)
Leclanche Cell c) Lead Cell d) Volta Cell
11.
Conversion of chemical energy into Electrical Energy occurs in
a)
Dynamos b)
Electric heaters c) Battery d) Atomic Bombs
12.
Lightening conductors are made of
a)
Iron b)
Copper c) Steel d) Chromium
13.
The metallic cap projecting out from the top of a cell is
a)
switch b)
Positive Terminal c) Negative Terminal
d) Spring
14.
Pure water is a non-conductor of electricity but can be made conductor by adding
to it__
a)
Sugar b)
Drops of oil c) Salt d) Pieces of wood
15.
Why does a fused bulb not glow when put in an electric current?
a)
The electric circuit remains incomplete
b)
There occurs a break in the path of current
c)
Both A and B
d)
None of the above
Answers to Question
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1.
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A
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The most conductive of all the elements is silver.
Unfortunately, silver is too rare and expensive to use in most electrical
equipment. Today, the most commonly used electrical conductor is copper.
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2
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C
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Rubber
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3
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C
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Neuron is another name for nerve cells
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4
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B
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Clay is a bad conductor of Electricity
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5
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B
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Complete or break a circuit
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6
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A
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Repel
each other
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7
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A
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Flow
of Electrons
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8
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B
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This is because salt water is
a good conductor of electricity.
Salt molecules are made of sodium ions and chlorine ions. ... These ions are
what carry electricity through
water
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9
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A
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Low melting point
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10
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C
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Lead
Cell
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11
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C
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Battery
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12
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B
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Copper
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13
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B
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Positive
Terminal
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14
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C
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Salt
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15
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A
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The
electric circuit remains incomplete
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Chapter-04 Magnets
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Important Points to Remember
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Magnetite is a mineral
containing Iron.
Magnetite is a Natural Magnet.
A Natural Magnet is also called Lode Stone
A Magnet attract iron and some
other substances. The substances possessing property of attracting iron are
called Magnets.
Each Magnet (Natural or
Artificial) has two magnetic poles irrespective of its shape.
Magnetic poles of a magnet are
called North Pole and South Pole.
When a magnet is suspended
freely it always aligns (Points) to North and South Direction
Similar poles of a magnet
Repel each other.
Opposite poles of a magnet
Attract each other.
A compass is a device used to
find directions. It consists of a small box with a glass cover, a Magnetised
needle is pivoted inside the box.
A Magnet loses its property if
it is
a) Heated, (b) Hammered, (c) Dropped from some height.
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Ex.1. Fill in the
blanks with the correct answer from the choices given below:
[ coil, closed
circuit, Magnetic Compass, Open circuit, MCB, Heater, Electromagnet, Electric
Current, high , Positive]
1. Magnetic effect of
current______________________
2. Heating effect of
current________________________
3. Circuit
breaker________________________________
4. A magnetic device
used to find geographical directions_________________________
5. The Electric path
that starts from the positive terminal of a cell and ends at the negative
terminal, without any break.
6. The electric path
that starts from the positive terminal of a cell, but is broken at some point before
reaching the negative terminal.
7. Flow of Charge
8. A piece of wire
twisted form a circle
9.The longer line in
the cell represents____________terminal.
10. All heating
devices are made of wires of___________resistance.
Ex.2 Multiple Choice
Questions
1. Magnetite is _____
a) A naturally
occurring Mineral b)
An artificial Magnet
c) Both the above d) None of
these
2. A magnet attracts
which of the following metals?
a) Cobalt b) Iron c) Nickel d) All of these
Q.3. Natural magnet has __________
a) Only One pole b)
Two poles c) Can’t say d) Unlimited number of
poles
Q.4. From a heap of sand and small iron pieces which methods
would you use to separate iron pieces from the same heap?
a) Hand Picking b)
By using a magnet c) Either a or b d) None of these
Q.5. A magnet is likely to lose its magnetic properties if
it_______________
a) Wrapped in cotton wool b)
Struck with a hammer
c) Kept in a cool Room d)
None of these
6. _______ can be converted into a magnet by use of a
magnet?
a) An Iron Rod b)
A Rod of Copper c) A needle of
Aluminium d) All the above
7. __________ of a bar magnet will attract maximum number of
iron nails when it is brought near a pile of iron nails?
a) North Pole b)
South pole c) Middle
Portion d)
Near both poles
8. Loss of magnetic properties of a magnet is____________
a) Demagnetization b)
Magnetization c) Dropping of
Magnet d) None of these
9. Many household appliances contain magnets. Which of the
following does not contain a magnet?
a) Radio/ TV b)
Fan c)
Refrigerator d)
Torch
10. Which of the following statement (s) is/are correct?
a) A magnetic Needle used in compass is not a magnet b) Dial of compass can rotate
freely
c) One end of the magnetic needle is painted Red d) All the above are
Correct
Chapter -03 Misc
Soil- Plants
Complete the
following statements with an appropriate
word/ term to be filled In the blank space(s)
1. Forests protect
the____________from Erosion.
2. Plants
release_______________through the process of photosynthesis
3. _____________helps
forests to grow and regenerate.
4. A forest is a
purifier of___________and ___________________
5. The decaying
leaves and animals dropping in a forest enrich the ____________
True / False
6. Forests release
Oxygen
7. Plants can prepare
their own food__________
8. Plants are
saprotrophs__________________
9. The roots of a
tree are called the crown_____________
10. Forest are
dynamic living entity__________________
Match the following:-
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Q.No
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Column –I
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No
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Column –II
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Your ans
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A
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Humus
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(i)
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Depend on Plants for food
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B
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Forests
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(ii)
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Branchy part of the tree
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C
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Herbivores
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(iii)
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Help Forests to grow
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D
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Crown
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(iv)
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Dark Coloured matter
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E
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Soil
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(v)
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Protect soil from erosion
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MPC Q
1. Which one of the
following is not a wild animal?
a) Boar b) Jackal c) Bison d) Goat
2. Decomposition
converts the dead plant and animal tissue into
a) Clay b) Inorganic Debris c) Humus d) Soil
3. What is the role
of Forest?
a) Provide food,
shelter, water and Medicines b)
Prevent soil Erosion
c) Prevent Floods d)
All of the above
4. The series of
eating and being eaten is called_____________
a) Food Chain b) Food Web c) Food Series d) Food Hub
5. Which of the
following is an animal product?
a) Humus b) Clay c) Gum d) Honey
Ex.4.
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1
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Suspended matter present in
Sewage which settles in settling tanks is called sludge
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Your Ans Y/N
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2
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Ethan gas exist from digestion
sludge
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3
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Chlorination is done to remove
the foul smell of water
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4
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Micro-Organisms decompose the
organics matter present in sewage
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5
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The last stage of sewage
treatment if chlorination
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6
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Ozone and Chlorine is used to
disinfect water before its released in to river
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7
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Dried sludge may be used as
pesticide
|
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8
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The water after treatment is
released into rivers and streams for use
|
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9
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Anaerobic Bacteria used to
decompose sludge
|
|
|
10
|
The first stage of treatment
of sewage is screening
|
|
Ex.3. MPC Q
1. Which is a quality
of wastewater?
a) Dirty look b) Foul Smell c)
Bad Taste d) All of
the above
2. Which of the following
is used as a manure after drying?
a) Sewage b) Pollutants c) Sludge d) Chemicals
3. The full form of
WWTP is
a) World wide
transport system b)
Waste water treatment plant
c) World workers
talent progremme d)
None of these
4. Which is a step of
wastewater treatment?
a) chlorination b) Aeration c) Filtration d) All of these
5. World water day is
celebrated on
a) 22 March b) 22 April c) 23 March d0 23 September
6. Which period is
considered as international decade for action on “ Water for life”?
a) 2005 to 2015 b) 2010 to 2020 c) 2000 to 2010 d) 2015 – 2020
7. How much water is
there in activated sludge?
a) About 97% b)
About 90% c) About 70%
d) About 50%
8. Which of the
following steps is not involved in the treatment of polluted water?
a) Aeration b) Filtration c) Contamination d) Chlorination
9. Waste water
released by houses is called_____________
a) Pollutants b) Sludge c) Sewage d) Kitchen waste
10. Which of the
following in not a water borne disease?
a) Cholera b) Typhoid c) Dysentry d) Chicken pox
Answers to Magnet
Chapter.
|
1.
|
Electromagnet
|
|
2
|
Heater
|
|
3
|
MCB
|
|
4
|
Magnetic Compass
|
|
5
|
Closed Circuit
|
|
6
|
Open Circuit
|
|
7
|
Electric Current
|
|
8
|
Coil
|
|
9
|
Positive
|
|
10
|
High
|
|
1
|
A
|
A naturally occurring Mineral
|
|
2
|
D
|
All of these
|
|
3
|
B
|
Two Poles
|
|
4
|
B
|
By using a magnet
|
|
5
|
B
|
Struck with a hammer
|
|
6
|
A
|
An Iron Rod
|
|
7
|
D
|
Near both poles
|
|
8
|
A
|
Demagnetization
|
|
9
|
D
|
Torch
|
|
10
|
C
|
One end of the magnetic needle is painted Red
|
Chapter 3.
|
1
|
Soil
|
|
2
|
Oxygen
|
|
3
|
Soil
|
|
4
|
Water, air
|
|
5
|
Soil
|
|
6
|
True
|
|
7
|
True
|
|
8
|
False
|
|
9
|
False
|
|
10
|
True
|
Ex. 1 Match the
columns:-
|
A
|
Iv
|
B
|
V
|
C
|
I
|
D
|
Ii
|
E
|
iii
|
MPC
|
1
|
D
|
2
|
C
|
3
|
D
|
4
|
A
|
5
|
D
|
Ex.4. Answer
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
YES
|
NO
|
NO
|
YES
|
YES
|
YES
|
NO
|
YES
|
YES
|
YES
|
Ex. 5
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
|
D
|
C
|
B
|
D
|
A
|
A
|
A
|
C
|
B
|
D
|
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