Question
101
Chemistry
Who suggested that the symbols of elements be made from one or two letters of the name of the element?
(A)
Berzelius
(B)
Darwin
(C)
Rutherford
(D)
Dalton
Correct Answer:
A
Explanation:
Jöns Jacob Berzelius proposed the modern system of chemical symbols using one or two letters.
Jöns Jacob Berzelius proposed the modern system of chemical symbols using one or two letters.
Question
102
Physics
What is the SI unit of electric potential difference?
(A)
Coulomb
(B)
Ampere
(C)
Volt
(D)
Kelvin
Correct Answer:
C
Explanation:
The SI unit of electric potential difference is the volt (V).
The SI unit of electric potential difference is the volt (V).
Question
103
Physics
What is the force called that pulls objects towards the Earth?
(A)
Gravitational force
(B)
Magnetic force
(C)
Electrostatic force
(D)
Frictional force
Correct Answer:
A
Explanation:
Gravitational force is the force that attracts objects towards the Earth.
Gravitational force is the force that attracts objects towards the Earth.
Question
104
Chemistry
What is the colour of the flame when magnesium is burned in air?
(A)
Lilac
(B)
Red
(C)
Green
(D)
White
Correct Answer:
D
Explanation:
Magnesium burns in air with a dazzling white flame and produces white light.
Magnesium burns in air with a dazzling white flame and produces white light.
Question
105
Physics
What is the purpose of large concave mirrors in solar furnaces?
(A)
To scatter sunlight over a large area
(B)
To create a parallel beam of light
(C)
To magnify solar images
(D)
To concentrate sunlight to produce heat
Correct Answer:
D
Explanation:
Large concave mirrors concentrate sunlight at a small area to produce intense heat in solar furnaces.
Large concave mirrors concentrate sunlight at a small area to produce intense heat in solar furnaces.
Question
106
Physics
The SI hertz is used for which physical quantity?
(A)
Amplitude
(B)
Speed
(C)
Frequency
(D)
Pitch
Correct Answer:
C
Explanation:
Hertz (Hz) is the SI unit of frequency. One hertz represents one cycle per second.
Hertz (Hz) is the SI unit of frequency. One hertz represents one cycle per second.
Question
107
Biology
What is the movement of water molecules through such a selectively permeable membrane known as?
(A)
Diffusion
(B)
Osmosis
(C)
Active transport
(D)
Filtration
Correct Answer:
B
Explanation:
The movement of water molecules through a selectively permeable membrane is called osmosis.
The movement of water molecules through a selectively permeable membrane is called osmosis.
Question
108
Chemistry
Which of the following causes early matches to ignite when they were rubbed on a rough surface?
(A)
The friction caused by white phosphorus
(B)
The friction caused by antimony trisulphide
(C)
The friction caused by potassium chlorate
(D)
The friction caused by glue and starch
Correct Answer:
A
Explanation:
Friction produces heat when a match is rubbed against a rough surface, causing the chemicals in the match head to ignite.
Friction produces heat when a match is rubbed against a rough surface, causing the chemicals in the match head to ignite.
Question
109
Biology
Salivary amylase is present in which body secretion of humans?
(A)
Mucus
(B)
Sweat
(C)
Saliva
(D)
Bile
Correct Answer:
C
Explanation:
Salivary amylase is present in saliva and begins the digestion of starch.
Salivary amylase is present in saliva and begins the digestion of starch.
Question
110
Biology
Who is credited with demonstrating that fermentation is caused by microorganisms?
(A)
Gregor Mendel
(B)
Robert Hooke
(C)
Louis Pasteur
(D)
Alexander Fleming
Correct Answer:
C
Explanation:
Louis Pasteur demonstrated that fermentation is caused by the activity of microorganisms.
Louis Pasteur demonstrated that fermentation is caused by the activity of microorganisms.
Total Questions:
120
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