In a photocell, light energy is converted into __________ energy.
Electrical
The percentage of oxygen in the air is approximately __________.
20.90%
Electrons in the outermost shell of an atom are called __________.
Valence electrons
Typhoid fever is caused by __________.
Bacteria
The chemical reaction causing rust is called __________.
Oxidation
An eye defect that causes blurred vision is called __________.
Astigmatism
The chemical name for Vitamin C is __________.
Ascorbic acid
Brass is an alloy of __________ and __________.
Copper and zinc
The average normal human body temperature is __________.
37°C
__________ is an element that is not radioactive.
Lead
__________ is the hardest pure form of carbon.
Diamond
Electric power is measured in __________.
Watt
The chemical symbol for potassium is __________.
K
Butane is commonly used in __________.
Cigarette lighters
Glucose provides __________ energy quickly to the body.
Instant
Heavy objects experience __________ buoyancy when placed in water.
Less buoyancy
Excess glucose is stored in the liver as __________.
Glycogen
Jaundice causes a yellow discoloration of the __________.
Eyes
ATP stands for __________.
Adenosine triphosphate
Plasma makes up about __________ percent of human blood by volume.
55.00%
Ampere is the SI unit of __________.
Electric current
The __________ is the lightest element in the periodic table.
Hydrogen (H)
A __________ is used to observe distant heavenly bodies.
Telescope
An example of a reptile that incubates eggs is __________.
Lizard
Vitamin D is important for __________ bones.
Strengthening
Power is defined as the rate of doing __________.
Work
__________ is an example of a non-metal element.
Carbon
Potatoes are examples of __________ stems.
Modified
The sun transfers heat energy to Earth through __________.
Radiation
Velocity is calculated by dividing __________ by __________.
Distance, time
Bird bones are __________ and __________ to reduce weight.
Hollow, interconnected
An example velocity of a sprinter is __________.
10 m/s
The primary organ of the human respiratory system is the __________.
Lungs
__________ respiration occurs without oxygen.
Anaerobic
Rabies is transmitted by the bite of a __________.
Rabid dog
Carbon dioxide contributes to the problem of __________.
Global warming
Tin is classified as a __________ magnetic material.
Non-magnetic
The red color of human blood comes from __________.
Hemoglobin
The chemical formula of laughing gas is __________.
N2O
The hardest natural substance is __________.
Diamond
A magnifying glass uses a __________ lens to focus light.
Convex
Methane is the main component of __________ gas.
Gobar gas
The SI unit used to measure force is __________.
Newton
The three primary colors of light are __________, __________, and __________.
Red, Blue, Green
Red blood cells are produced in the __________.
Bone marrow
There are __________ planets in the Solar System.
8
The ozone layer primarily protects the Earth from __________ rays.
Ultraviolet (UV)
The acid __________ is not produced during fermentation.
Hydrochloric acid (HCl)
The simplest and lightest atom is __________.
Hydrogen
ISRO stands for __________.
Indian Space Research Organisation
Rust on iron is a result of __________.
Oxidation
The BCG vaccine protects against __________.
Tuberculosis
Electrical resistance is measured in __________.
Ohm
The chemical formula of methane is __________.
CH4
__________ is a non-metal that conducts electricity well.
Graphite
__________ is a common magnetic metal.
Iron
A material that can be stretched into a wire is called __________.
Ductile
Graphite is commonly used to make __________.
Pencils
__________ is used with iron to produce stainless steel.
Chromium
The year __________ was a leap year.
2008
Ice melts at __________ degrees Celsius.
0°C
The molecular formula of ethanol is __________.
C2H5OH
Deforestation often results in reduced __________.
Rainfall
The type of antibiotic called __________ is commonly used.
Penicillin
Earthworms have a __________-segmented body.
Segmented
Blood makes up about __________ percent of total human body weight.
7.00%
The pigment responsible for red color in blood is __________.
Hemoglobin
Types of radioactive emissions include __________, __________, and __________.
Beta, Gamma, Alpha
Weeding involves removing __________ plants from a field.
Undesirable
Ebonite is a poor conductor of __________.
Heat
Photosynthesis occurs most efficiently under __________ light.
Blue
A body at rest still possesses __________ energy.
Potential
A lack of iron in the body causes the condition called __________.
Anaemia
Hemoglobin is a complex protein that contains __________.
Iron
After digestion, proteins are broken down into __________.
Amino acids
Electrical energy is measured in __________.
Kilowatt-hour
Liquefied petroleum gas (LPG) mainly contains __________ and __________.
Propane and Butane
The heaviest type of radioactive ray is the __________ ray.
Alpha
The chemical formula of common table salt is __________.
NaCl
The rotation of the Earth causes the __________ cycle.
Day-night
Stainless steel contains the elements __________ and __________.
Chromium (Cr), Nickel (Ni)
Natural gas is mostly composed of __________.
Methane
Clouds float in the atmosphere because they have __________ density.
Low
Hemoglobin is found in __________.
Blood
Buoyancy of an object depends on the __________ of the fluid.
Density
Eczema is a disease affecting the __________.
Skin
The basic structural and functional unit of life is the __________.
Cell
Oranges are a rich source of __________.
Vitamin C
The heat energy received by Earth comes from the __________.
Sun
Frequency is measured in __________.
Hertz
Oxygen is __________ classified as a noble gas.
Not
Among the types of radioactive rays, the __________ is the heaviest.
Alpha
Photosynthesis is the process by which plants produce __________.
Food
Ammonia (NH3) is commonly used in __________ systems.
Refrigeration
Matter exists in __________ main states.
3
Mendeleev’s periodic table was arranged according to __________.
Atomic weight
Nitrogen is the main gas found in __________.
Biogas
The formula for hydrogen peroxide is __________.
H2O2
Convex mirrors are used as __________ mirrors in vehicles.
Rear-view
__________ is an example of a single-celled protozoan organism.
Amoeba