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WorksheetsFINAL TEST - SCIENCE (GRADE 7)
Total questions: 25
Worksheet time: 6hrs 15mins
What is the average diameter of bacteria?
1x10-5 m
1x10-6 m
1x10-7 m
1x10-10 m
Where is almost the whole mass of an atom is concentrated at?
the electron of the atom
the orbit of the atom
the energy of the atom
the nucleus of the atom
How is an atom electrically neutral?
The positive charge and the negative charge cancel each other out.
The positive charge and the negative charge support each other out.
The positive charge and the negative charge improve each other out.
The positive charge and the negative charge energize each other out.
Who did an experiment that showed that the atom consists mainly of empty space?
John Dalton
J. J. Thomson
Ernest Rutherford
Niels Bohr
What is the number of neutrons in silver atom above?
108
61
47
155
What is a molecule made up?
two or more elements physically combined
two or more elements chemically combined
two or more atoms physically combined
two or more atoms chemically combined
Which one is the molecule that DOES NOT BELONG to triatomic?
How many electrons are there in the atom model above?
34
35
36
37
Carbon : Gray
Hydrogen : White
Oxygen : Red
Nitrogen : Blue
Based on the atom model and information above, what is the chemical formula of Niacin (Vitamin B3)?
C5H6N2O
C6H5N2O
C5H6NO2
C6H5NO2
Which one is NOT molecules of compounds?
Br2
CO
SO2
H2O
The arrangement of the particles in an atom is similar to the Solar System. What would the planets represent if the sun represents the nucleus?
Protons
Neutrons
Electrons
Empty Space
What is the chemical symbol of Gadolinium, Lawrencium and Seaborgium?
Gd, Lr and Sg
Ga, La and Se
Ga, La and Sg
Gd, Lr and Se
How fast does light travel in vacuum?
300,000,000 km/h
300,000,000 m/s
30,000,000 km/h
30,000,000 m/s
What will happen if some light rays pass through a stained glass?
multiple shadow
no shadow
a shadow
a lighter shadow
What is the reflected ray?
Rays of light that fall onto a surface
Imaginary line passing through the point of incidence
The ray that travels away from the point of incidence
The bouncing of light rays off a surface
What will happen if parallel light rays are reflected off a piece of paper?
The light rays remain parallel.
Undistorted image appears.
The image is formed.
Irregular reflection occurs.
How does an inferior mirage occurs?
When a layer of hot air is sandwiched between a surface and a layer of hot air.
When a layer of cool air is sandwiched between a surface and a layer of hot air.
When a layer of hot air is sandwiched between a surface and a layer of cool air.
When a layer of cool air is sandwiched between a surface and a layer of cool air.
Which one is the correct order of colours created when a beam of white light travels through a prism?
red, orange, yellow, green, blue, velvet and indigo
red, orange, yellow, green, blue, indigo and velvet
red, yellow, orange, green, blue, indigo and velvet
red, orange, yellow, blue, green, indigo and velvet
An object is kept 25 cm in front of a convex mirror which forms a smaller image one-fifth the size of the object. What is the focal length of the mirror?
6.2 cm
6.1 cm
6 cm
5.9 cm
An object is positioned 40 cm from a concave mirror of a focal length 20 cm. What is the magnification?
-2 cm
-1.5 cm
-1 cm
-0.5 cm
An object is placed 54 cm from a convex mirror with a focal length 6 cm. What is the magnification?
0.1 cm
0.9 cm
0.2 cm
0.8 cm
-20 cm
-22 cm
-24 cm
-26 cm
12 cm
13 cm
14 cm
15 cm
10.8 cm
-10.8 cm
10.6 cm
-10.6 cm
2.2 cm
-2.2 cm
2.1 cm
-2.1 cm
