Humans have __________ chromosomes.
46
__________ gas is not present in the atmosphere.
Chlorine
Haemophilia is a __________ disease.
Genetic
Scurvy is caused by deficiency of __________.
Vitamin C
Arthritis affects the __________.
Bones
Gravity was discovered by __________.
Isaac Newton
X-rays were discovered by __________.
Wilhelm Röntgen
The organ responsible for blood purification is the __________.
Kidney
Penicillin is an __________.
Antibiotic
The smallest unit of a chemical compound is a __________.
Molecule
The longest-living tortoises belong to the genus __________.
Geochelone
The disease eradicated by immunisation is __________.
Polio
__________ is necessary for photosynthesis.
Sunlight
An ammeter measures __________.
Electric current
Water boils at __________ at sea level.
100°C
Sodium has atomic number __________ and mass number __________.
11, 23
Heavy water contains __________ hydrogen.
Heavy (deuterium)
Humans have __________ pairs of chromosomes.
23
A jet engine is a type of __________ combustion engine.
Internal
Frequency remains constant when a wave passes from one medium to another.
1
The sky appears blue due to __________ scattering.
Light
Gold is a __________ metal.
Noble (inert)
Heavy water’s chemical formula is __________.
D2O
Rusting of iron is a __________ change.
Chemical
Photosynthesis takes place in __________.
Chloroplasts
Mercury is __________ at room temperature.
Liquid
The human heart beats about __________ times per minute.
72
Malaria is transmitted by __________ bites.
Mosquito
An atom contains __________ charged particles.
Two
Violet deviates the most in a __________.
Prism
The primary colors are __________, __________, and __________.
Red, Green, Blue
Bronchitis is caused by __________ pollution.
Air
The universal blood recipient group is __________.
AB
Nitrogen makes up approximately __________% of air.
0.78
The adult human skeleton has __________ bones.
206
Salt’s chemical formula is __________.
NaCl
Electricity consumption is measured in __________.
Kilowatt hour
A catalyst __________ the rate of a chemical reaction.
Alters
__________ connect bones to bones.
Ligaments
Red phosphorus is found in __________.
Matchsticks
The telephone was invented by __________.
Alexander Graham Bell
The hardest natural substance is __________.
Diamond
Sunlight contains __________ colors.
Seven
The heart’s rhythm is regulated by the __________.
Pacemaker
Cholera is a __________ disease.
Bacterial
The study of human skin is called __________.
Dermatology
A balanced diet includes proteins, vitamins, and __________.
Carbohydrates
Anaemia can be caused by deficiency of vitamin __________.
B12
Silver acts as a __________.
Semiconductor
The human heart has __________ chambers.
Four
The formula for kinetic energy is __________.
½ mv²
Sound travels slowest in __________.
Air
Tuberculosis is caused by __________.
Bacteria
Power is measured in __________.
Watts (Joule per second)
The chemical symbol of helium is __________.
He
The chemical formula of glucose is __________.
C6H12O6
The gas inside a light bulb is usually __________.
Nitrogen
Newton's third law applies to __________ rockets.
Space
Plastic is a __________ material.
Synthetic
Vehicle emissions contain gases like __________, SO2, and NOx.
Carbon monoxide (CO)
Gravity causes objects to __________ back to Earth.
Fall
Long cooking can reduce __________, folic acid, and essential fatty acids in food.
Protein
Water has maximum density at __________.
4°C
Yellow is a __________ color.
Secondary
A microscope is used to __________ small objects.
Enlarge
Oxygen is essential to __________.
Life
Baking soda is chemically called __________.
Sodium bicarbonate
Speed of sound at 0°C is approximately __________ m/s.
332
The number of bones in the human face is __________.
14
Zinc sulphate is poorly soluble in __________.
Water
Dengue spreads through __________ bites.
Mosquito
Coal transforms into __________ under metamorphism.
Diamonds
Mica is a type of __________.
Mineral
Newton formulated the __________ laws of motion.
Three
Carbon dioxide is used in __________.
Photosynthesis
The metal with highest electrical conductivity is __________.
Silver
Mercury is used in __________.
Thermometers