Question

1. the nuclide ​ra undergoes alpha - decay. the mass number and atomic number of the daughter nuclide are respectively a. 230, 90 b. 226, 88 c. 226, 89 d. 222, 86 45. ash from cocoa pod tastes bitter because it contains a. alcohol. b. alkali. c. acid d. soap. 46. a musical note is sound with a definite a. intensity. b. frequency. c. amplitude. d. velocity. 47. hydrological cycle is the system by which water continuously circulates through the a. troposphere. b. biosphere. c. atmosphere. d. mesosphere. 48. the structure associated with the absorption of fatty acids and glycerol in the small intestines is a. lacteals of the villi. b. lymphatic system. c. blood capillaries. d. hepatic portal veins. 49. it is most difficult to detect carbon (ii) oxide gas than most poisonous gases because it a. does not support combustion. b. is insoluble in water. c. is heavier than air. d. has no smell and colour. 50. metamorphic rocks are formed through a. chemical change caused by heat and pressure. b. biological change of original rocks. c. physical disintegration of igneous rocks. d. combination of igneous and sedimentary rocks. end of paper

Explanation:

• Question 44: In alpha - decay, the mass number of the parent nucleus decreases by 4 and the atomic number decreases by 2. Without knowing the parent nucleus here, but based on the concept of alpha - decay.
• Question 45: Ash from cocoa pod contains alkali which gives it a bitter taste.
• Question 46: A musical note is sound with a definite frequency.
• Question 47: The hydrological cycle is the system by which water continuously circulates through the biosphere.
• Question 48: The lacteals of the villi are associated with the absorption of fatty acids and glycerol in the small intestine.
• Question 49: Carbon (II) oxide (carbon monoxide) is most difficult to detect because it has no smell and colour.
• Question 50: Metamorphic rocks are formed through chemical change caused by heat and pressure.

Answer:

• 44: (No parent - nucleus given, but concept - based).
• 45: B. alkali
• 46: B. frequency
• 47: B. biosphere
• 48: A. lacteals of the villi
• 49: D. has no smell and colour
• 50: A. chemical change caused by heat and pressure