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Second Prep
Science
Revision Sheet
Answer e following questions:
Question 1:
A- Complete the following:
1- Transverse waves are formed of…………. and………..
2- Complete oscillation includes ………… successive displacement,
each of them is called………
3- The type of pollination in the same flower is…………and the
pollination between two flowers is …………
4- The first law of sound reflection, the angle ……………….. = the
angle of………………………
5- Sound waves are ……… waves which can not travel through……..
6- The colored whorl of the flower is called.....…... each leaf is
called……….
7- Light reflection is the…………. of light waves in the same medium
on a ………… surface.
8- The first law of sound reflection, the angle
2m
of……………….. = the angle of………………………
B- From the opposite figure , find:
2
1- Wave length = …………..
1
2- Frequency = …………….
3- Amplitude = …………….
4- Wave velocity = …………..
0.2sec
C- Problem:
An oscillating body makes 480 complete oscillations in one minute
Calculate:
1- The frequency.
2- Periodic time.
C- Calculate:
The sound velocity of a tone, its frequency is 264 Hz and its
wavelength is 1.3 m.
Question 2:
A- Choose the correct answer:
1- The male nucleus enters the ovule inside the ovary through
the…….
a- style
b- stigma
c- pistil
d- micropyle
2- The human ear cannot hear sounds of frequency…………
a- 50 Hz
b- 30 Hz
c- 300 Hz
d- 10 Hz
3- The echo can be heard if the distance between the sound source
and the reflecting surface is not less than ……………
a- 10m
b- 17m
c- 34m
d- 50m
4- Light is reflected…………. when it falls a rough surface.
a- regularly
b- irregularly
c- and refracted d- and scattered
5- The complete oscillation includes ……………displacement (s).
a- one
b- two
c- three
d- four
6- Fertilization occurs when ……….. is formed.
a- embryo
b- zygote
c- endometrium
d- ovum
7- When the distance between the source of light and the surface of
a wall decreases, the light intensity ……….
a- decreases b- increases
c- is doubled
d-remains constant
8- White light is a mixture of………… colors.
a- seven
b- six
c- five
d- eight
B- Give reasons for each of the following:
1- Petals of corolla are colorful and scented.
2- Bats can locate the position of their prey.
3- Occurrence of mirage phenomenon in desert regions at noon.
4- Anthers of some flowers are hanging.
5-Aluminium foil is an opaque.
6- We see lightning before hearing thunder.
7- Metallic pots are not used in microwave ovens.
8-The ears of fennec fox are big and concave.
9- Fallopian tube is lined with cilia.
10-Palm trees can not t be pollinated by self- pollination.
Question 3:
A- Put ( √ ) or ( X ) in front of each statement:
1- Ultrasonic waves have frequencies less than 20 Hz.
( )
2- The movement of the pendulum is considered as
a wave motion.
( )
3- Intensity of sound increases by increasing the distance between
the sound source and the ear.
( )
4- The ovum developed to be a fruit.
( )
5-The wall of the ovary after pollination forms the coat of the
fruit.
( )
6- Light travels through transparent media in straight lines. ( )
7- The movement of a simple pendulum is a wave motion. ( )
8- Ultrasonic waves have frequencies more than 20000 Hz. ( )
B- What is meant by:
1- The wave length of a sound wave is 2 m.
2- The refractive index of glass is 1.5.
3- Angle of reflection of a light ray is zero.
4- Absolute refractive index of water is 1.33.
Question 4:
A- Write the scientific term for each of the following:
1- It is the ability of the medium to refract light.
2- Repetition of the original sound due to its reflection.
3- Motion which is repeated regulary in equal periods of time.
4- The reproduction of some plants by parts of roots, stems or
leaves.
5- Distance that is travelled by sound in one second.
6- Medium that dose not let light to pass through.
7-The waves which need medium to propagate through.
8-The reproduction of some plants by parts of roots stems or
leaves.
B- Define:
1- Light intensity.
2- Sound reflection.
3- Mirage.
4- Vegetative reproduction.
C-Compare between:
1- Electromagnetic waves and Mechanical waves.
2-Transverse waves and longitudinal waves.
B-Mention one use for each of the following:1- Ultrasonic waves.
2- Periscope.
3-Triangle prism.
4- Flower's calyx.