The properties of the formed image when an object placed at the focus of a convex lens are....
real, erect and magnified image is formed at the same side of the object
virtual, erect and magnified image is formed at the same side of the object
virtual, erect and diminished images always Formed.
No image is formed
If the angle between the incidence ray and the reflected ray is 60°, the angle between the reflected ray and the reflecting surface is 60°.
True
False
One of the vector physical quantities is………
length of a pen
force by which person pushes a stone
time of a car trip
mass of a cat
The value of the length of the shortest straight line between two positions = 5 m. means ........
the value of center= 5m
the value of displacement = 5m
the value of distance = 5m
the properties of the formed image when an object is placed in front of a convex mirror are ..................
No image is formed.
virtual, erect and magnified image is formed at the same side of the object.
virtual, erect and diminished images always Formed
real, erect and diminished images always Formed
An assumption of the crossing star theory is that a star revolves near the Sun.
A doctor advised a person who has a sight defect to use glasses with convex lenses. It means that this person suffers from.........
a decrease in the convexity of the eye lens surface
an increase in the eyeball diameter
an increase in the convexity of eye lens surface
disability of seeing far objects clearly
The speed of a moving body that covers equal distances at unequal time intervals.
regular speed
speed
irregular speed
Accelaration
The......... is the phase in which the cell is prepared for division by doubling the genetic material.
prophase
metaphase
interphase
anaphase
A car moved from Banha to Cairo at a distance of 40 km in 30 minutes, then it returns back from Cairo to Banha in the same time. Calculate (in km/h) The average speed of the car during the total time.
20 km/h
80 km/h
160 km/h
40 km/h
The solar system includes several galaxies
Bread mould fungus reproduces by binary fission
A concave mirror has a focal length of 8 cm. An object is placed in front of this mirror forming an image at a distance 20 cm from the mirror. This means that the object is placed at...........from the mirror.
8 cm
more than 8 cm. and less than 16 cm
20 cm
less than 8 cm
Reproduction by spores occurs in all the following organisms, except.........
starfish
bread mould.
mushroom
fungus
The displacement of an object is measured in m/sec