The scientist ________ discovered the main energy levels of the atom

All of the following are green house gases EXCEPT ________

Metal oxides are ________- oxides

The elements of group 1A are known as ________

All the following elements from metalloids except for ________

_________ is considered the midway between horse and zebra

The snow crystal has ________ shape

______ is an example of endangered living organisms

___________ react very slowly with cold water

Ionosphere is surrounded by ______ belts

Ozone layer doesn't allow the passage of __________ ultraviolet rays

All of the following metals react with water except _______

Ozone layer allows 100% of _________ ultraviolet rays to penetrate.

The temperature at the top of mesosphere layer reaches ________

From microfossils _________-

The hottest atmospheric layer is the ________

The ozone hole increases in _______each year

The elements which occupy the middle block (d) in the periodic table _______

Ozone layer is found in _________ layer

Atmospheric is the _________ of air column of an atmospheric height on an area

When water freezes, its density __________

Sodium oxide is from _____ oxides

Meteors are formed in ________ layer

The Ozone layer is measured in a unit is called ________

The atmospheric pressure on the top of a mountain is ________the atmospheric pressure at the sea level

Satellites orbit in __________ of the Earth

All of the following cause ersoion of ozone layer except _________

Pilots prefer to fly their planes in ________- layer

____________ is one of the most important reasons for the recent extinction age

If the frequency of an oscillating body = 6 Hz , so the periodic time = _________ seconds

The zygote contains ________ of number of chromosomes of Ovum

The ovary of _________ flower contains one ovule

The submerged object in water is seen in an apparent position slightly above its real position due to _________ of light.

The human skin is considered as a\an ________ object.

The light ray refracts _________ the normal when it travels from air to glass.

All of the following are from the factors affecting sound intensity except the ________

We can determine the speed of a wave propagation from the relation: Speed = ______

the ovule after fertilization becomes a _________

The amplitude of the simple pendulum is __________ of complete vibration

The result of multiplying the frequency of an oscillating body by its periodic time equals _________

Light waves are _______- waves

The quantum of energy of green light is ________ the quantum of energy of yellow light

The angle of incidence is greater than the angle of refraction, when a light ray travels _________

The produced fruits by grafting belong to the type of the ________

From the typical flower is _________

The human ear can hear sounds of frequency __________KHz

When the incident light ray reflects on itself, the angle of incidence equals ______

After fertilization, the ovary develops to become the _________

When the distance between the source of light and the surface of a wall is doubled, the light intensity on the surface ________

Polen grains form inside the ________ of the flower

The photon energy = Plank's constant x ________

The distance between two successive compressions is called _________

The corolla leaves are called __________

Regular reflection appeared on ________

The _______color of the spectrum colors has the highest deviation

The speed of the ball of the simple pendulum ________ as we move away from the rest position

The sound frequency 500 Hz is _________ than the sound of frequency 100 Hz

The angle of incidence of light is _________ its angle of reflection

Flowers pollinated by air characterized by all of the following except ________

The male reproductive organ in the flower is _________

The measuring unit of noise intensity is _________

If the distance between the the center of the fifth compression and the center of the ninth compression of a longitudinal wave is 4 m then the wavelength of this wave is ________

All of the following plants reproduce sexually EXCEPT ______

Artificial vegetative reproduction by cutting can be done by ______

If the frequency of red color is 4 x 10¹² Hz, so the frequency of the violet color is ______x 10¹² Hz

If the light speed in air is higher than that in another transparent medium, so the refractive index is ________

The periodic time of a tuning fork which produces 240 vibrations in one minute is equal _______

All of the following are parts of the female reproductive system except _________

Pollination in colored flowers takes place by _______

The sound velocity is measured in __________

The pollen tube contains_________

The maximum displacement made by the oscillating body away from its original position is ________

The distance between two successive troughs or two successive crests in the transverse wave is _________

The result of multiplying the frequency by its periodic time equals _________

Kinetic energy = 1\2 x ___________

Radio waves __________

The sound of frequency 200 Hz is _______ than the sound of frequency 100 Hz

If the angle between the incident light ray and the reflected light ray is 90^o, so the angle of reflection will be equal _______

__________ produces pollen grains

The ovary of the _______ flower contains one ovule

The sound velocity is the greatest through ________

The voice of Adam differs from that of Sara because they are different in _______

All of the following are factors affecting sound intensity except _________

The innermost whorl of the male flower is ________

One amplitude is _________ of a complete oscillation

The outer whorl of the plant is called _________

Reproduction by _______ is used only between plants of highly similar to each other, lke orange and naring

From the methods of cross pollination is _________

White light analyzes into ________ spectrum colors