اختبار الكتروني كتاب علوم لغات

1
The crossing over phenomenon takes place at the end of
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A body of length 4 cm is placed at a distance of 8 cm from a convex mirror, so the length of the formed image becomes
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The ability of some animals to compensate their missing parts is called the
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The line between the centers of curvature of the lens passing by the optical centre of the lens is called the
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if the speed of a car is 72 km\hour, this means that its speed equals ............ m\s
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The spindle filaments appear during cell division in
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The image of the object that lies at the centre of curvature of a concave mirror is ...
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If the chromosomal number in the male gamete of an organism is 20 so, the chromosomal number in the liver cell equal
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..... established the crossing star theory
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The centromere of each chromosome divides longitudinally and the spindle fibers contract in mitosis during
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The number of chromosomes in the gamete is ..... the number of chromosomes in the original cell
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When the body covers equal distance at unequal periods of time, the speed will be
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All the following cells contain full copy of genetic material except
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The uniform acceleration means that the object speed ,,,, by equal values through equal periods of time
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From the scalar physical quantities is the
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The object moves at a constant (uniform) speed when
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A concave mirror with a focal length of 20 cm, and the object is placed at a distance of 50 cm from the mirror, the image is formed at a distance
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The centromere of each chromosome is divided longitudinally, then the two chromatids are separated from each other in the
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Yeast fungus reproduces asexually by
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The solar system consists of the Sun and ..... planets revolve around it
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reproduction which considered as a source of genetic variation is ..... reproduction
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The scientist who established the nebular theory is
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(Speed - time) graph for a regular motion at a constant speed is a straight line is
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When an object is placed to face a convex mirror, the image formed is
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Fred Hoyle relates controlling the sun in the orbits of the planets around it to ....of the sun
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The chemical structure of the chromosome is
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The two gases which produced galaxies, stars and universe through millions of years are
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The universe contains
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From the properties of the image formed by a convex mirror is
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If a person stands at a distance 2 m from a plane mirror, the distance between the person and his image is
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The value of change of an object speed in one second is called
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Our solar system is located in one of the ...... arms of the Milky was galaxy
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The distance from the centre of mirror curvature and its focus equals
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From the scalar quantities
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Spindle fibers appear during the cell division in the
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When an object acceleration equal zero this means that
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Meiotic division in flowering plants occurs in the anther to produce
38
Within minutes of the Big Bang, the percentage of hydrogen in the universe was
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If the speed of a car is 36km\h, it means that its speed is
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The distance and displacement are equal when the body moves in a ..... in one direction
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If the distance between two centers of curvatures to the lens is 20 cm. so its focal length equal
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ratio between final and initial speed for moving body with accelerating motion ....
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The scientist who founds modem theory of the world is
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The two factors in which the movement of an object can be described
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Property of the image of the object formed by the plane mirror always be
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scientists believe that the universe emerged from massive explosion and it is in
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If a light ray falls passing through the optical centre of the convex lens, it leaves the lens
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The continuous expansion of the universe, is due to
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The founder of modern theory of the solar system is .... scientist
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The image formed by using a concave lens is