61. When NaHCO3 is heated, it produces
(A) CO2
(B) CaCO3
(C) Ca(QH)2
(D) Cao
62. Stoma, found in the epidermis of leaves closes when guard cells ____
(A) Gain water
(B) Lose water
(C) Exchange gas
(D) None of these
63. Iron and steel structures are damaged by:
(A) Carbon Monoxide
(B) Sulphur dioxide
(C) Carbon dioxide
(D) Methane
64. Inflammation of liver is caused by
(A) Cholera
(B) Hepatitis
(C) Typhoid
(D) Jaundice
65. Paris Climate Agreement was adopted in:
(A) 2014
(B) 2015
(C) 2016
(D) 2017
66. The United Nations Conference on Environment and Development (UNCED) also known as RIO Summit was held in
(A) 1990
(B) 1991
(C) 1992
(D) 1993
67. What is the speed of sound in air
(A) 1347 km/h
(B) 1235 km/h
(C) 1290 km/h
(D) 1495 km/h
68. Enzymes are basically made up of:
(A) Fats
(B) Nucleic Acids
(C) Vitamins
(D) Proteins
69. What is the life span of red blood cells?
(A) 110 days
(B) 140 days
(C) 120 days
(D) 170 days
70. What is the percentage of water present in our brain?
(A) 75%
(B) 85%
(C) 95%
(D) 73%
71. In order to make Nitrogen available to primary producers like plants, in ecosystem it is converted into:
(A) Nitrates
(B) Nitrites
(C) Ammonia
(D) Nitric Acid
72. Parthenocarpy is the production of fruit which makes the fruit
(A) Full of seeds
(B) Seedless
(C) Bitter
(D) Waterless
73. The World Day to Combat Desertification and Drought is a United Nations is observed on
(A) 17 June
(B) 17 July
(C) 17 August
(D) 17 May
74. A normal CD-ROM usually can store up to data?
(A) 650 mb
(B) 680 mb
(C) 720 mb
(D) 820 mb
75. Dengue is caused by which type of mosquito:
(A) Culex
(B) Marsh
(C) Aedes
(D) rylayaro
76. Which tube among the following Joins kidneys and bladder?
(A) Urethra
(B) Ureter
(C) lnfenor Vena Cava
(D) Suprapubic Tube
77. Edward Jenner successfully developed world’s first vaccine in:
(A) 1796
(B) 1696
(C) 1896
(D) 1596
78. The pancreatic juice which aids digestion is secreted into?
(A) Liver
(B) Duodenum
(C) Stomach
(D) Ileum
79. Who among the following transmitted first radio signal through air?
(A) Faraday
(B) Marconi
(C) Graham Bell
(D) Tesla
80. High-tech exports of Pakistan stand at
(A) 0.7%
(B) 0.8%
(C) 0.9%
(D) None of above