Hepatitis is a liver inflammatory disease. Viral infections (Hepatitis A, B, C, etc.) are known to cause it and alter the performance of the liver.
42. The cause of the disease Polio is:
a) Virus
b) Bacteria
c) Fungus
d) Protozoa
Poliomyelitis (Polio) is an extremely contagious viral disease that is caused by the poliovirus. It enters the nervous system and it may paralyze completely within hours.
43. What vitamin is needed to clot blood?
a) Vitamin A
b) Vitamin B
c) Vitamin C
d) Vitamin K
Vitamin K plays an important role in the formation of various proteins (clotting factors) necessary to coagulate blood, and prevent excessive bleeding.
44. The chief action of the kidney is:
a) To control blood pressure
b) To produce hormones
c) To sieve out blood waste.
d) To help in digestion
The primary role of the kidneys is to filter metabolic waste products, excess ions and water in the blood to form urine.
45. Which of them is a water-borne disease?
a) Tuberculosis
b) Malaria
c) Cholera
d) Tetanus
Cholera is a diarrheal disease that is caused by Vibrio cholerae bacterium and spreads through contaminated water.
46. A normal cell of a human being consists of:
a) 42
b) 44
c) 46
d) 48
A normal human somatic (body) cell is diploid and has 46 chromosomes, which form 23 pairs.
47. What is it that gives the eye its colour?
a) Retina
b) Pupil
c) Iris
d) Cornea
The iris is the colored section of the eye which regulates pupil size and determines eye color.
48. Short-sightedness is also called:
a) Hypermetropia
b) Myopia
c) Presbyopia
d) Astigmatism
Nearsightedness, medically known as myopia, is when a person sees near objects clearly but distant ones blurry.
49. The SI unit of force is:
a) Joule
b) Newton
c) Watt
d) Pascal
The SI derived unit of force is the newton (N), equal to the force required to accelerate 1 kg at 1 m/s².
50. What is the device that measures atmospheric pressure?
a) Hygrometer
b) Thermometer
c) Barometer
d) Voltmeter
A barometer is a scientific device that measures air pressure, essential in weather prediction.
51. The energy stored in a dam is:
a) Kinetic Energy
b) Potential Energy
c) Solar Energy
d) Chemical Energy
The height of water behind a dam has gravitational potential energy. When released, it turns turbines and converts into kinetic energy.
52. Which among these is a good conductor of electricity?
a) Rubber
b) Plastic
c) Copper
d) Wood
Copper conducts electricity well because of its free electrons and is widely used in electrical wiring.
53. The dentist mirror that gives dentists an enlarged image of teeth is:
a) Plane Mirror
b) Convex Mirror
c) Concave Mirror
d) Spherical Mirror
Dentists use concave mirrors because close objects like teeth appear enlarged, erect, and virtual.
54. Sound travels at maximum speed in:
a) Solids
b) Liquids
c) Gases
d) Vacuum
Sound travels fastest in solids because their molecules are closely packed, allowing quicker wave transmission.
55. What gas is present in fire extinguishers?
a) Oxygen
b) Hydrogen
c) Carbon Dioxide (CO2)
d) Nitrogen
Fire extinguishers use CO2 because it is heavier than air and smothers flames by cutting off oxygen supply.
56. An electric bulb has a filament that is composed of:
a) Iron
b) Tungsten
c) Copper
d) Aluminum
Tungsten is used in bulb filaments due to its very high melting point, allowing it to glow without melting.
57. What gas is released by plants when photosynthesizing?
a) Carbon Dioxide
b) Oxygen
c) Nitrogen
d) Hydrogen
During photosynthesis, plants use CO2 and water to produce glucose, releasing oxygen as a byproduct.
58. The way in which plants lose water is known as:
a) Photosynthesis
b) Respiration
c) Transpiration
d) Evaporation
Transpiration is the process of water movement in plants and its evaporation from leaves, stems, and flowers.
59. What does the plant call its food factory?
a) Root
b) Stem
c) Leaf
d) Flower
Leaves are the food factories of plants, where chlorophyll captures sunlight to convert CO2 and water into glucose.
60. Is the following a non-flowering plant?
a) Rose
b) Sunflower
c) Fern
d) Mango
Ferns are non-flowering plants (cryptogams) because they reproduce with spores instead of seeds or flowers.
