Which of the following is NOT a type of simple machine?
A Lever B Pulley C Turbine D Inclined plane
A turbine is not a simple machine. The six simple machines are lever, pulley, inclined plane, wedge, screw, and wheel-axle.
What is the primary component of natural gas?
A Ethane B Propane C Methane D Butane
Methane (CH4) is the primary component of natural gas, making up about 70-90% of its composition.
Which blood cell is responsible for carrying oxygen throughout the body?
A White blood cells B Red blood cells C Platelets D Lymphocytes
Red blood cells (erythrocytes) contain hemoglobin and transport oxygen from lungs to body tissues.
What is the process by which a liquid changes into a solid?
A Condensation B Freezing C Sublimation D Deposition
Freezing is the phase change from liquid to solid, typically occurring at the freezing point of a substance.
Which of the following diseases is caused by a deficiency of Vitamin C?
A Beriberi B Scurvy C Rickets D Pellagra
Scurvy is caused by vitamin C deficiency, leading to weak connective tissue and poor wound healing.
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At what temperature do Celsius and Fahrenheit scales show the same reading?
A -40° B 0° C 100° D 40°
At -40°, both Celsius and Fahrenheit scales show the same value: -40°C = -40°F.
What is the half-life of Carbon-14, which is used in radioactive dating?
A 573 years B 5,730 years C 57,300 years D 573,000 years
Carbon-14 has a half-life of approximately 5,730 years, making it useful for dating archaeological artifacts.
Which of the following correctly represents the order of electromagnetic spectrum from lowest to highest frequency?
A Radio, microwave, visible, X-ray, gamma B Gamma, X-ray, visible, microwave, radio C Visible, radio, microwave, X-ray, gamma D X-ray, visible, radio, gamma, microwave
The electromagnetic spectrum in order of increasing frequency: Radio < Microwave < Infrared < Visible < Ultraviolet < X-ray < Gamma.
Which of the following is a renewable source of energy?
A Coal B Solar energy C Natural gas D Petroleum
Solar energy is a renewable source that can be replenished naturally, while coal, natural gas, and petroleum are non-renewable fossil fuels.
Which acid is present in the human stomach?
A Acetic acid B Hydrochloric acid C Citric acid D Sulfuric acid
Hydrochloric acid (HCl) is secreted by the stomach lining and helps in the digestion of proteins.
Which vitamin is synthesized by the human body when exposed to sunlight?
A Vitamin A B Vitamin B C Vitamin D D Vitamin C
Vitamin D is produced by the body when skin is exposed to ultraviolet rays from the sun.
Which gas is used for respiration by most organisms?
A Nitrogen B Oxygen C Carbon dioxide D Hydrogen
Oxygen is essential for aerobic respiration in most organisms. It is used in cellular respiration to produce energy (ATP).
Which of the following is an example of a conductor?
A Rubber B Copper C Glass D Plastic
Copper is an excellent electrical conductor that allows electricity to flow through it easily. Rubber, glass, and plastic are insulators.
What is the percentage of oxygen in the Earth's atmosphere?
A 15% B 21% C 31% D 42%
Oxygen comprises approximately 21% of Earth's atmosphere. Nitrogen makes up about 78%, with other gases comprising the remainder.
Which disease is caused by iodine deficiency?
A Scurvy B Goiter C Anemia D Rickets
Goiter is caused by insufficient iodine in the diet, leading to thyroid gland enlargement. Iodine is essential for thyroid hormone production.
What is the SI unit of electrical current?
A Volt B Ohm C Ampere D Watt
The Ampere (A) is the SI unit of electrical current, named after physicist André-Marie Ampère.
Which planet in our solar system has the most moons?
A Saturn B Jupiter C Uranus D Neptune
Jupiter has 95 confirmed moons (as of 2024), making it the planet with the most moons in our solar system.
What is the process of conversion of iron into rust primarily called?
A Reduction B Oxidation C Corrosion D All of the above
Corrosion is the process of rust formation. Iron oxidation in the presence of moisture and oxygen leads to rust (Fe2O3).
Which gland produces insulin in the human body?
A Thyroid gland B Pancreas C Pituitary gland D Adrenal gland
The pancreas produces insulin, a hormone that regulates blood glucose levels. Beta cells in the pancreas secrete insulin.
What is the focal length of a plane mirror?
A Zero B Infinity C Equal to radius of curvature D Half the radius
A plane mirror has infinite focal length because it does not converge or diverge light rays.
