61. What type of metal can be found in hemoglobin?
- a) Sodium
- b) Potassium
- c) Iron
- d) Calcium
Hemoglobin has an iron atom located at its center that attaches to oxygen for transport in red blood cells.
62. The hydrocarbon which is involved in wrapping potato chips is:
- a) Oxygen
- b) Hydrogen
- c) Carbon Dioxide
- d) Nitrogen
Nitrogen gas replaces oxygen in food packaging to prevent rancidity and oxidation.
63. What is the hardest material in the human body?
- a) Bone
- b) Tooth Enamel
- c) Nail
- d) Skull
Tooth enamel is the hardest and most mineralized substance in the human body, made mostly of hydroxyapatite.
64. What kind of mineral forms strong bones and teeth?
- a) Iron
- b) Iodine
- c) Calcium
- d) Sodium
Calcium is the main mineral for strong bones and teeth and also supports nerve and muscle function.
65. Who found the principle of gravity?
- a) Albert Einstein
- b) Sir Isaac Newton
- c) Galileo Galilei
- d) Alexander Fleming
Sir Isaac Newton proposed the universal law of gravitation in the 17th century.
66. The science of insects is named:
- a) Ornithology
- b) Geology
- c) Entomology
- d) Pathology
Entomology is the scientific study of insects, a branch of zoology.
67. What is the measuring instrument of electric current?
- a) Voltmeter
- b) Ammeter
- c) Galvanometer
- d) Ohmmeter
An ammeter measures current in a circuit, expressed in amperes (A).
68. The nearest planet to the Sun is:
- a) Venus
- b) Earth
- c) Mercury
- d) Mars
Mercury is the smallest and closest planet to the Sun in our solar system.
69. The human body has the largest gland:
- a) Pancreas
- b) Liver
- c) Skin
- d) Pituitary
The liver is the largest internal gland and performs over 500 essential functions.
70. Which of these is not a renewable resource?
- a) Wind Energy
- b) Solar Energy
- c) Natural Gas
- d) Hydropower
Natural gas is a fossil fuel and non-renewable on a human timescale.
71. The building block of biogas is:
- a) Carbon Dioxide
- b) Methane
- c) Hydrogen
- d) Nitrogen
Biogas mainly consists of methane (CH₄), produced from anaerobic decomposition of organic material.
72. Discoverer of penicillin:
- a) Louis Pasteur
- b) Robert Koch
- c) Alexander Fleming
- d) Marie Curie
Sir Alexander Fleming discovered penicillin in 1928 from the mould Penicillium notatum.
73. Which is the vitamin that is produced by the bacteria growing in the human intestine?
- a) Vitamin A
- b) Vitamin C
- c) Vitamin D
- d) Vitamin K
Vitamin K is synthesized by beneficial bacteria in the human intestine, along with dietary intake.
74. Deficiency of which vitamin leads to the disease “Pellagra”?
- a) Vitamin B1
- b) Vitamin B3 (Niacin)
- c) Vitamin B12
- d) Vitamin E
Pellagra is caused by severe deficiency of Niacin (Vitamin B3), leading to diarrhea, dermatitis, and dementia.
75. What vitamin can be found in carrots?
- a) Vitamin A
- b) Vitamin B
- c) Vitamin C
- d) Vitamin D
Carrots are rich in beta-carotene, which the body converts into Vitamin A, vital for vision and immunity.
76. Vitamin E is also known as:
- a) Vitamin A
- b) Vitamin C
- c) Vitamin D
- d) Vitamin E (Alpha-tocopherol)
Vitamin E refers to a group of compounds, the most active being alpha-tocopherol, a powerful antioxidant.
77. Normal healthy adult human blood has a total volume of approximately:
- a) 5 liters
- b) 6 liters
- c) 7 liters
- d) 8 liters
A healthy adult has about 5 liters of blood, around 7–8% of total body weight.
78. Which of the following does not belong to the human circulatory system?
- a) Heart
- b) Artery
- c) Vein
- d) Nephron
Nephrons are the functional units of the kidney, part of the excretory system, not the circulatory system.
79. The hormone “Insulin” is a:
- a) Carbohydrate
- b) Fat
- c) Protein
- d) Mineral
Insulin is a protein hormone secreted by the pancreas to regulate blood sugar levels.
80. How many chambers does the human heart have?
The human heart has four chambers: two atria and two ventricles for pumping blood.
