Liquefied Petroleum Gas (LPG) is a mixture of flammable hydrocarbon gases, primarily propane and butane. Since both are chief components, (e) is the correct choice.
42. Soap removes grease by
(a) Coagulation
(b) Adsorption
(c) Emulsification
(d) Osmosis
(e) None of the above/More than one of the above
Correct Answer:
(c) Emulsification
Explanation:
Soap molecules form micelles around grease (oil) particles, breaking them into smaller droplets that can be suspended in water and washed away. This process is called emulsification.
43. Which of the following hormones play a role in release of milk from mammary glands?
(a) Adrenaline
(b) Thyroxine
(c) Progesterone
(d) Oxytocin
(e) None of the above/More than one of the above
Correct Answer:
(d) Oxytocin
Explanation:
Oxytocin stimulates the ‘let-down’ reflex, which causes the muscles around the mammary glands to contract and release milk. Prolactin is the hormone responsible for milk production.
44. Match List-I with List-II…
A. Skin Cancer – 1. Chlorofluorocarbons
B. Noise Pollution – 2. Ultraviolet light
C. Global warming – 3. Decibel
D. Ozone Hole – 4. Carbon dioxide
Correct Answer:
(b) 2 3 4 1
Explanation:
Overexposure to Ultraviolet (UV) light causes skin cancer (A-2). Noise pollution is measured in decibels (B-3). Global warming is primarily caused by greenhouse gases like Carbon dioxide (C-4). The depletion of the ozone layer (Ozone hole) is caused by Chlorofluorocarbons (CFCs) (D-1).
45. In human body, Vitamin A is stored in
(a) Liver
(b) Skin
(c) Lung
(d) Kidney
(e) None of the above/More than one of the above
Correct Answer:
(a) Liver
Explanation:
The liver is the primary storage site for fat-soluble vitamins, including Vitamin A (retinol and its esters), in the human body.
46. Which of the following vitamins is used as an antidote to anticoagulant poisons?
(a) Vitamin A
(b) Vitamin D
(c) Vitamin E
(d) Vitamin K
(e) None of the above/More than one of the above
Correct Answer:
(d) Vitamin K
Explanation:
Anticoagulant poisons like warfarin work by inhibiting the function of Vitamin K, which is essential for the synthesis of blood clotting factors. Administering Vitamin K reverses this effect.
47. Iodised salt contains
(a) Free iodine
(b) Calcium iodide
(c) Magnesium iodide
(d) Potassium iodide
(e) None of the above/More than one of the above
Correct Answer:
(d) Potassium iodide
Explanation:
Iodised salt is table salt mixed with a minute amount of an iodine-containing salt, typically potassium iodate (KIO3) or potassium iodide (KI), to prevent iodine deficiency.
48. Which of the following is present in maximum in acid rain?
(a) HCl
(b) HNO3
(c) H2SO4
(d) H2CO3
(e) None of the above/More than one of the above
Correct Answer:
(c) H2SO4
Explanation:
Acid rain is primarily composed of sulfuric acid (H2SO4) and nitric acid (HNO3). Generally, sulfuric acid, formed from sulfur dioxide emissions, is the major component (about 60-70%).
49. ‘God Particle’ is
(a) Neutrino
(b) Higgs Boson
(c) Meson
(d) Positron
(e) None of the above/More than one of the above
Correct Answer:
(b) Higgs Boson
Explanation:
The Higgs Boson is an elementary particle nicknamed the ‘God Particle’. Its associated field, the Higgs field, is thought to be responsible for giving mass to other fundamental particles.
50. Which of the following radio isotopes is used in the treatment of blood cancer [leukemia]?
(a) Iodine -131
(b) Sodium-24
(c) Phosphorus-32
(d) Cobalt-60
(e) None of the above/More than one of the above
Correct Answer:
(e) None of the above/More than one of the above
Explanation:
Phosphorus-32 is used internally to treat some types of leukemia. Cobalt-60 is widely used in external radiotherapy for many cancers, including leukemia. Since both are valid answers, (e) is the most appropriate choice.
