MCQOPTIONS
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MCQOPTIONS
This section includes 532 Mcqs, each offering curated multiple-choice questions to sharpen your Grade8 knowledge and support exam preparation. Choose a topic below to get started.
| 51. |
Weathering of rocks is affected by |
| A. | rain |
| B. | temperature |
| C. | both a and b |
| D. | erosion |
| Answer» D. erosion | |
| 52. |
The dead remains of animals and plants also accumulate to form |
| A. | coal |
| B. | natural oil |
| C. | diamond |
| D. | sedimentary layer |
| Answer» E. | |
| 53. |
With the passage of time the transported sediments become |
| A. | smoother |
| B. | smaller |
| C. | rounder |
| D. | all of them |
| Answer» E. | |
| 54. |
Water in freezing form may break the rocks in to pieces by force of |
| A. | reduction |
| B. | evaporation |
| C. | expansion |
| D. | condensation |
| Answer» D. condensation | |
| 55. |
Rocks are made up of |
| A. | soil |
| B. | core |
| C. | mantle |
| D. | crust |
| Answer» E. | |
| 56. |
The higher the frequency the greater will be |
| A. | pitch |
| B. | loudness |
| C. | amplitude |
| D. | infrasound |
| Answer» B. loudness | |
| 57. |
If we tighten the strings of instrument the pitch will be |
| A. | higher |
| B. | lower |
| C. | constant |
| D. | no pitch |
| Answer» B. lower | |
| 58. |
Sound having frequencies above 20000Hz are called |
| A. | infrasound |
| B. | ultrasound |
| C. | mega sound |
| D. | micro sound |
| Answer» C. mega sound | |
| 59. |
The number of vibrations in a second is called |
| A. | pitch |
| B. | frequency |
| C. | amplitude |
| D. | infrasound |
| Answer» C. amplitude | |
| 60. |
Louder sound can cause damage to |
| A. | hearing |
| B. | sight |
| C. | skin |
| D. | brain |
| Answer» B. sight | |
| 61. |
A measure of amount of energy in a sound wave is called its |
| A. | wavelength |
| B. | frequency |
| C. | amplitude |
| D. | all of them |
| Answer» D. all of them | |
| 62. |
Ultrasound and infrasound are not detected by |
| A. | humans |
| B. | animals |
| C. | birds |
| D. | all of them |
| Answer» E. | |
| 63. |
An instrument which can produce a number a sounds with high and low frequencies and pitch is the |
| A. | violin |
| B. | piano |
| C. | guitar |
| D. | double bass |
| Answer» C. guitar | |
| 64. |
The regions where molecules spread out are called |
| A. | rarefactions |
| B. | compressions |
| C. | digressions |
| D. | progressions |
| Answer» B. compressions | |
| 65. |
The SI unit of frequency is |
| A. | hertz |
| B. | Newton |
| C. | Pascal |
| D. | ampere |
| Answer» B. Newton | |
| 66. |
Dry scaly skin and night blindness is caused by deficiency of |
| A. | vitamin A |
| B. | vitamin B1 |
| C. | vitamin C |
| D. | vitamin D |
| Answer» B. vitamin B1 | |
| 67. |
Gastric juice is made of |
| A. | water |
| B. | hydrochloric acid |
| C. | proteases |
| D. | all of them |
| Answer» E. | |
| 68. |
Enzymes which help in digestion if food are called |
| A. | digestive enzymes |
| B. | assimilation enzymes |
| C. | co-ordinate enzymes |
| D. | complex enzymes |
| Answer» B. assimilation enzymes | |
| 69. |
Antiperistalsis may lead to |
| A. | vomiting |
| B. | flu |
| C. | headache |
| D. | backache |
| Answer» B. flu | |
| 70. |
The process of digestion starts in |
| A. | mouth |
| B. | esophagus |
| C. | stomach |
| D. | pancreas |
| Answer» B. esophagus | |
| 71. |
Flu, cold and HIV are caused due to presence of |
| A. | bacteria |
| B. | virus |
| C. | yeast |
| D. | fungi |
| Answer» C. yeast | |
| 72. |
The agents which are responsible to cause infection by micro-organisms are called |
| A. | pathogens |
| B. | DNA |
| C. | antibody |
| D. | antigen |
| Answer» B. DNA | |
| 73. |
Systems which open to external environment are protected from bacteria by presence of |
| A. | mucus membranes |
| B. | HCl |
| C. | hairs |
| D. | plug |
| Answer» B. HCl | |
| 74. |
Germs may enter the body via |
| A. | mouth |
| B. | skin |
| C. | eyes |
| D. | all of them |
| Answer» E. | |
| 75. |
The hazard of mountain climbing is |
| A. | weathering |
| B. | snow fall |
| C. | rock falls |
| D. | erosion |
| Answer» D. erosion | |
| 76. |
The chemical or physical process by which rock exposed to the weather undergo changes in character and breakdown is called |
| A. | erosion |
| B. | weathering |
| C. | land sliding |
| D. | earth quake |
| Answer» C. land sliding | |
| 77. |
Sedimentary rocks includes |
| A. | shale |
| B. | sandstone |
| C. | conglomerate |
| D. | all of them |
| Answer» E. | |
| 78. |
The process of wearing down of Earth's surface and altering into landforms is called |
| A. | erosion |
| B. | weathering |
| C. | land sliding |
| D. | earth quake |
| Answer» B. weathering | |
| 79. |
The measure of the empty spaces in a material is called its |
| A. | volume |
| B. | surface area |
| C. | porosity |
| D. | elasticity |
| Answer» D. elasticity | |
| 80. |
The close association between two organisms of different species is called |
| A. | symbiosis |
| B. | mutualism |
| C. | parasitism |
| D. | food chain |
| Answer» B. mutualism | |
| 81. |
The environment is composed of |
| A. | biotic components |
| B. | a biotic components |
| C. | both a and b |
| D. | organisms |
| Answer» D. organisms | |
| 82. |
Ant is a social animal which live in |
| A. | groups |
| B. | herds |
| C. | flocks |
| D. | colonies |
| Answer» E. | |
| 83. |
To obtain maximum light creepers and vines have adapted |
| A. | tendrils |
| B. | clasping roots |
| C. | twining stems |
| D. | all of them |
| Answer» E. | |
| 84. |
All living things which affect the organism in any way constitutes the |
| A. | biotic environment |
| B. | abiotic environment |
| C. | ecosystem |
| D. | food chain |
| Answer» B. abiotic environment | |
| 85. |
Calcium plays an important role in |
| A. | building bones and teeth |
| B. | muscle growth |
| C. | clotting of blood |
| D. | all of them |
| Answer» E. | |
| 86. |
Pancreas produces |
| A. | pancreatic juice |
| B. | bile |
| C. | amylase |
| D. | gastric juice |
| Answer» B. bile | |
| 87. |
Calcium, iron, iodine and sodium are |
| A. | vitamins |
| B. | minerals |
| C. | proteins |
| D. | carbohydrates |
| Answer» C. proteins | |
| 88. |
Deficiency in iodine can cause |
| A. | goiter |
| B. | anemia |
| C. | rickets |
| D. | nerve degeneration |
| Answer» B. anemia | |
| 89. |
The value of carbohydrates per gram is |
| A. | 17KJ/g |
| B. | 77KJ/g |
| C. | 27KJ/g |
| D. | 19KJ/g |
| Answer» B. 77KJ/g | |
| 90. |
Light refracts due to its |
| A. | speed |
| B. | volume |
| C. | density |
| D. | area |
| Answer» B. volume | |
| 91. |
When light is refracted through glass prism it will give |
| A. | rainbow colors |
| B. | primary colors |
| C. | secondary colors |
| D. | cool colors |
| Answer» B. primary colors | |
| 92. |
The splitting of white light in to its component colors is called |
| A. | reflection |
| B. | refraction |
| C. | dispersion |
| D. | diffusion |
| Answer» D. diffusion | |
| 93. |
In human eye the light is refracted by |
| A. | cornea |
| B. | lens |
| C. | both a and b |
| D. | retina |
| Answer» D. retina | |
| 94. |
The materials which allow some light to pass through them are called |
| A. | transparent |
| B. | translucent |
| C. | opaque |
| D. | semi-absorbent |
| Answer» C. opaque | |
| 95. |
Bleeding of gums is called |
| A. | scurvy |
| B. | rickets |
| C. | kwashiorkor |
| D. | night blindness |
| Answer» B. rickets | |
| 96. |
Sucrose is obtained from |
| A. | milk |
| B. | sugar cane |
| C. | fish |
| D. | honey |
| Answer» C. fish | |
| 97. |
Tiny finger like projection on the inner wall of small intestine vastly increases the surface area of small intestine for the absorption of digested food in to blood stream are called |
| A. | villi |
| B. | pancreas |
| C. | gall bladder |
| D. | appendix |
| Answer» B. pancreas | |
| 98. |
Starch is converted in to maltose by help of enzyme |
| A. | amylase |
| B. | amylopectin |
| C. | hydras |
| D. | pectin |
| Answer» B. amylopectin | |
| 99. |
Margarine, nuts, palm oil and olive oil is obtained from |
| A. | plants fat |
| B. | animal fat |
| C. | earth |
| D. | air |
| Answer» B. animal fat | |
| 100. |
The introduction of foreign specie will upset dynamic equilibrium of |
| A. | water |
| B. | air |
| C. | ecosystem |
| D. | climate |
| Answer» D. climate | |