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81. In night, when photosynthesis is stopped, plants
(A) take in Carbon Dioxide
(B) take in Oxygen
(C) give off Carbon Dioxide
(D) give off Oxygen

82. During photosynthesis, plants
(A) take in Carbon Dioxide
(B) take in Oxygen
(C) give off Carbon Dioxide
(D) give off Oxygen

83. __________ are called the powerhouses of the cell.
(A) Mitochondria
(B) Vesicles
(C) Lungs
(D) Liver

84. Mitochondria contain their own supply of
(A) DNA
(B) Amino acids
(C) Vitamins
(D) Oxygen

85. The first chemical explosive, Gunpowder, is a mixture of
(A) Sulfur, Charcoal and Nitrogen Oxide
(B) Sulfur, Charcoal, and Potassium Nitrate
(C) Sulfur and Charcoal
(D) Charcoal and Potassium Nitrate

86. The number of oscillations per second is called the
(A) hertz
(B) waves
(C) pitch
(D) frequency

87. Sound waves from a loudspeaker are caused by
(A) frequency
(B) vibrations
(C) pitch
(D) amplitude

88. The guitar has __________ strings.
(A) 4
(B) 5
(C) 6
(D) 7

89. The device used to measure movements of the heart is
(A) Cardiograph
(B) Seismograph
(C) Hydrometer
(D) Hygrometer

90. The unit used to measure ‘Pressure’ is
(A) pascal
(B) newton
(C) watt
(D) tesla

ANSWERS: SCIENCE MCQS
81. C
82. D
83. A
84. A
85. B
86. D
87. B
88. C
89. A
90. A

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