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Worksheetsjy78uh
Total questions: 124
Worksheet time: 1hrs 5mins
The speed of light in a vacuum is known to be
universal
constant
universal constant
constant universal
what image is this ?
shadow
reflection
inverted
none of these
light travels in a straight line , this property of light is known as ?
rectilinear propagation
straight line
rectilinear
propagation
choose the true options
we have eclipses every month
light travels faster than sound
the light from torch cannot travel a long distance
none of the above are true
A (a) is a dark shape
(a) is a eclipse that occurs when moon comes between sun and earth .
Which of them are the properties of shadows ?
a shadow only forms the outline of the image
Shadows are colourful
shadow depends on the shape of the image
all of these
which of the following is natural sources of light ?
fire
sun
stars
all of the above
Which of the following are types of rays of light ?
ray of light
parallel ray of light
spreading rays
none of the above
Who explained that light emerged from the eyes and struck the objects , and that is how we saw objects
(a)
Light travels in ________.
straight line
curved line
zig-zag line
randomly
When an opaque object comes in the path of light it forms ____________.
an image with colors
shadow
black and white image
depends on the colour of the light
Which types of objects do not allow light to pass through them?
Translucent
Opaque
Transparent
Penumbra
Which is an example of a translucent object?
A thin sheet of paper
A clear glass
A thin iron sheet
All of these
Bouncing back of light from shining surfaces is called
Reflection
Refraction
Bending
Dispersion
What is lateral inversion?
Image becomes inverted
Image bends laterally
Right of the object appears left of the image
All of these happen
Which letters of English alphabet will not show lateral inversion?
I, O, U
N, Z, X
I, X, E
A, E, I
Which is a device to image the sun?
Plane mirror
Pinhole camera
A straight pipe
Glass slab
Which of the following is a natural source of light?
Firefly (Jugnu)
Tube light
torch
Electric bulb
Out of these, which one is not a man-made luminous body?
Electric bulb
Burning candle
The Sun
Oil lamp
Which of the following does not have light of its own?
a torch
a lamp
the moon
the sun
An object or material could be opaque, transparent, translucent or ……………….
(a)
A ……………. is a dark outline of an opaque object that blocks light coming from a source.
(a)
……………… objects cast no shadow.
(a)
Opaque objects cast …………………. shadows in morning and evening while ………………… shadows at noon.
(a)
Light travels in a ………… (a) line .
Shadow is ……………. In color.
(a)
When light hits a barrier that is solid/opaque what is usually created?
a hot object
a shadow
nothing
If you can see light through an object it is called...
opaque
plastic
transparent
which of the characteristics is not exhibited by the shadow of an object?
erect
can be formed on screen
same colour as the object
can be bigger than the object
which of the following the non-luminous obejct
sun
moon
stars
firefly
which of the following is an example of an opaque object
clean water
plastic wrap
cardboard sheet
spectacle glass
When the Sun is behind you, your shadow is ...
behind you
in front of you
at the side of you
not there
12.Translucent is?
When light bounces off an object
Material that only allows a little light to pass through
Our main source of light
Opaque is?
Material that allows light to pass through
Light made by nature
Material that allows no light to pass through
What is the main source of light?
sun
trees
moon
When an object moves closer to a light source, its shadow...
Gets smaller
Gets bigger
Changes shape
Stays the same size
Shadows are longest during _______.
morning and evening
noon
night
Where will the tree's shadow be?
A
B
C
An opaque object means that ...
light passes through
no light passes through
some light passes through
you can see through it
When an opaque object comes in the path of light it forms ____________.
an image with colors
shadow
black and white image
depends on the colour of the light
Which is an example of a translucent object?
A thin sheet of paper
A clear glass
A thin iron sheet
All of these
A glowing LED bulb and a ringing bell are kept in a vaccum jar. A person looking at the jar will
see the bulb glowing and hear the bell ringing
hear the bell ringing but will not see the bulb glowing
see the bulb glowing but will not hear the bell ringing
neither see the glowing bulb nor hear the ringing bell
What would be the colour of the shadow of a green ball?
Black
green
Blue
None of these
You will see the shortest shadow of yourself in sunlight .......
in the morning
in the evening
at noon
in the night
Which of the following is not always necessary to observe a shadow?
sun
source of light
screen
opaque object
Ahmed observed the shadow of a tree at 8:00 am, 12:00 noon and 3:00 pm. Which of the following statements is closest to his observation about the shape and size of the shadow?
the shape of the shadow of the tree changes but the size remains the same
the size of the shadow of the tree changes but the shape remains the same
Both the size and shape of the shadow of the tree change
Neither the shape nor the size of the shadow changes
Opaque material
objects that emit light of their own
a material that allows most of the light to pass through it
a material that allows only a part of light to pass through it
a material that does not allow any light to pass through it
A patch of light is observed at B, when the torch is lighted as shown. Which of the following is kept at position A to get this patch of light?
A wooden board
A glass sheet
A mirror
A sheet of white papers.
Look at the figure. What difference can be seen in the shadow formed on the screen in A and B ?
shadow of A will be round
shadow of B will be round
Shadow of A will be bigger than shadow of B
both will form the same type of shadow
Lunar eclipse
shadow cast by the moon on the earth
shadow cast by the moon on the sun
shadow cast by the earth on the moon
shadow cast by the earth on the sun
Solar eclipse
shadow cast by the moon on the earth
shadow cast by the moon on the sun
shadow cast by the earth on the moon
shadow cast by the earth on the sun
Which of the following can never form a circular shadow?
A ball
A shoe box
A flat disc
An ice cream cone
Which of the following will stop all light from passing through it?
A. shoe
B. pencil
C. cardboard
D. piece of thin cloth
A,B and C
B,C and D
A,C and D
A,B and D
we can see the moon because it ...................
absorbs light
gives out light
reflects light
does not have a shadow
A student observes a tree given in above figure through a pin hole camera. Which of the diagrams (a) to (d), depicts the image seen by her correctly?
Four students A, B, C and D looked through pipes of different shapes to see a candle flame as shown in figure given below. Through whose pipe the light will be visible ?
A
B
C
D
A magnet comes to a rest in _________________ direction when freely suspended.
north-south
south-east
north-west
south-west
A magnet can attract magnetic materials like ___________ and ____________.
copper and aluminium
steel and silver
iron and steel
iron and aluminium
What will happen when these magnets are brought close together?
They will repel each other.
They will attract each other.
Both magnets will turn to the left
Both magnets will turn to the right
What happens when two bar magnets repel each other?
The poles of the magnets pull toward each other.
The centers of the magnets pull toward each other.
The centers of the magnets push away from each other.
The poles of the magnets push away from each other.
When two magnets attract, they ______________
push apart
change color
get colder
pull together
What will happen when these magnets are brought near each other?
They will repel each other.
They will attract each other.
They will stay at the same position.
What would we call a nail that can pick up a paperclip because it is touching a magnet?
force
detector
poles
temporary magnet
The space around a magnet where the force of a magnet can attract best is called__________
horseshoe magnet
magnetic field
magnetism
bar magnet
Amy used a magnet to hold one piece of paper on the refrigerator. Later, she tried to use the same magnet to hold a stack of four pieces of paper, and the magnet wouldn't stick to the fridge. Why did this happen?
The magnet needs glue
The magnet couldn't hold due to the thickness of the paper
Paper repels magnets
A magnet isn't attracted to the refrigerator.
Which statement is true?
All magnets can attract large objects
All Magnets have the Same shape and Size
Magnets can not pull through Solids.
All Magnets have a North and a South Pole
Earth's magnetic South Pole is near Earth's geographic North Pole
True
False
An electromagnet is a magnet that
its strength can be varied and turned on and off
always has a magnetic field around it
has very little strength
What TWO ways are electromagnets different from permanent magnets?
they can be turned off and on
they can increase in strength by increasing the current in the wire
they are smaller in size
they are permanant
Permanent Magnets and Electromagnets are similar in which TWO ways?
it can be turned off and on
they both have a north and south pole
they are surrounded by a magnetic field
A compass needle shows us the magnetic field of
the sun
the moon
Earth
a magnet that is near by
Observe the pictures A and B given below carefully. Which of the following statements is correct for the above given pictures ?
In A, cars 1 and 3 will come closer and in B, cars 2 and 4 will come closer.
In A, cars 1 and 3 will move away from each other and in B, cars 2 and 4 will move away.
In A, cars 1 and 3 will move away and in B, 2 and 4 will come closer to each other
In A, cars 1 and 3 will come closer to each other and in B, 2 and 4 will move away from each other
Opaque material
objects that emit light of their own
a material that does not allow any light to pass through it
a material that allows only a part of light to pass through it
a material that allows most of the light to pass through it
The arrangements to store two magnets is shown by figures (a), (b), (c) and (d). which one of them is the correct arrangement?
A
B
C
D
which one of the given option is an unique property of an image ?
A screen or surface is required to form
Irrespective of the colour of the object, it is always black
It will shows all the details of an object, including its colour.
It always show the outline or the shape of the object and not the details.
Three magnets A, B and C were dipped one by one in a heap of iron filings. The figures below show the amount of the iron filing sticking to them. The strength of these magnets will be
A > B > C
A < B < C
A = B = C
A < B > C
Two ring magnets A and B are put through a rod as shown. Why is magnet A suspended over magnet B?
The unlike poles of the magnets face each other
The like poles of the magnets face each other
The rod is made of a magnetic material
Magnet X is lighter than magnet Y
fastest thing
cheetah
sound
revolution of earth
light
Magnetite
each of the two points of a magnet where the magnetic strength is maximum
a rock made of iron oxide that has magnetic properties
the force exerted by a magnet on magnetic materials in its magnetic field
to lose magnetism and magnetic properties
Khalid set up an experiment as shown in the diagram here. Which of the following will make the shadow of the object bigger ?
a. The object is moved closer to the screen
b. The torch is moved closer to the object
c. The object is moved further away from the screen
a and b only
b and c only
a and c only
all of the above
Light is a form of ______ that is essential for the existence of life.
chemical
expression
term
energy
The object that does not produce it's own light is called
Luminous objects
Dark
Bright
Non Luminous objects
Light travels in a _________ path
Straight
Curved
Slanting
None of these
What is the best explanation for a person seeing himself in the mirror?
reflection
refraction
absorbed
flipped
When light bounces back it is _____
Reflected
Refracted
Optical Density
Absorbed
Pinhole camera is based on the ___________
Rectilinear propagation of light
Rectangular propagation of light
Circular propagation of light
None of these
Shadow of an object is always
Colourful
White
Black
Transparent
Where will the tree's shadow be?
A
B
C
what all are needed for forming a shadow
screen, mirror, opaque object
mirror, a source of light, glass
source of light, a screen, opaque object
A student placed a pencil in a glass of water. The pencil appears broken because..
light always travels in a straight line
the pencil cuts through the water
light bends when it passes through water
light reflects the pencil on the surface of water
Opaque or transparent. What is this bottle?
Transparent
Opaque
Luminiscent
Source of light
A source of light made by man
Natural light
Artificial light
Sunglasses
Light travels in straight lines until reflected by another object. Which illustration best shows the light being reflected?
Rectilinear propagation of light means
light bends after striking a smooth surface
light travels in a straight line
light travels in a curvilinear line
both a and b
which of the characteristics is not exhibited by the shadow of an object?
erect
can be formed on screen
same colour as the object
can be bigger than the object
which of the following objects can cast a dark shadow?
a lighted bulb
a wooden door
a glass pane
both a and b
Shadow of an object is always
Colourful
White
Black
Transparent
When we move an object away from the source of light, the shadow of the object _____________
Become bigger
Becomes smaller
Remains the same
None of these
When green light falls on a blue object, the colour of the shadow is _______
Green
Blue
White
black
WHERE WOULD BE A SHADY PLACE TO STAND ON A SUNNY DAY ?
IN THE MIDDLE OF A FOOTBALL GROUND
IN THE SEA
UNDER A TREE
NONE OF THE ABOVE
which of the characteristics is not exhibited by the shadow of an object?
erect
same colour as the object
can be formed on screen
can be bigger than the object
A plane mirror form an image of an object because it ........ light from the object
Absorbs
Emits
Passes
Reflects
This is not a beam of light
The headlight of a car
A torch shines
Light from firefly
Projector onto a screen
When the left side of an object appears as the right side of the image and vice versa, this phenomenon is called
Literally inversion
Lateral Invasion
Lateral Inversion
Literally Invasion
which of these are required to form the shadow of a ball
Torch
Ball
Screen
All of these
Image formed in a pinhole camera is always
Erect
Inverted
Parallel
None of these
Where will the tree's shadow be?
A
B
C
Which will make the darkest shadow? Light shining on a...
sheet of thin tissue paper
glass window
wooden chopping board
none of the above
What does reflection mean?
Light bouncing off an object.
Light is bending around an object.
Light is moving through and object.
This is no light.
What is the best explanation for Mickey seeing himself in the mirror?
Refraction
Absorption
Reflection
Flipped
There is light on the Earth even on a dark, cloudy day. This is because clouds are:
Opaque
Translucent
Transparent
Luminous
Where are periscopes used ?
Fire departments
Submarines
Military
Hospitals
Which of the following properties are used while using the periscope ?
gravitational force
reflection of light
property of lights and beams
None of these
