CBSE Class 7 Science Quiz | CBSE Class 7 Science MCQs & Answers

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Questions
81 An instrument used to study the speed of winds is called _________.
A manometer
B anemometer
C ammeter
D speedometer

Answer: anemometer
82 The direction of airflow is also affected by Earth’s rotation. It is called ________.
A Coriolis Effect
B El nino Effect
C La Nina Effect
D Greenhouse Effect

Answer: Coriolis Effect
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83 Which one of the following statement is INCORRECT?
A When air gets heated, it expands.
B when air gets cooled, it contracts.
C The warm air is heavier than cold air.
D Air moves from high pressure region to low pressure region.

Answer: The warm air is heavier than cold air.
84 What is the name given to the wind blowing from sea to land?
A Thunderstorm
B Land breeze
C Sea breeze
D cyclone

Answer: Sea breeze
85 When wind speed increases, air pressures
A decreases
B increases
C remains constant
D none of these

Answer: decreases
86 Soil formation is a
A slow process
B fast process
C rapid process
D none of these

Answer: slow process
87 Which soil horizon contains humus?
A A-Horizon
B B-Horizon
C C-horizon
D Bedrock

Answer: A-Horizon
88 Which topsoil is best suited for growing plants
A Sandy soil
B Loamy Soil
C Clayey Soil
D None of these

Answer: Loamy Soil
89 Soil profile refers to an arrangement within a soil of
A its horizontal layout
B vertical layout
C Size of soil particles
D None of these

Answer: its horizontal layout
90 The water holding capacity is the highest in
A sandy soil
B clayey soil
C loamy soil
D mixture of sand and loam

Answer: clayey soil
91 In addition to the rock particles, the soil contains
A air and water
B water and plants
C minerals, organic matter, air and water
D water, air and plants

Answer: minerals, organic matter, air and water
92 Which soil layer is made up of small lumps of rocks?
A A-horizon
B B-horizon
C C-horizon
D Bedrock

Answer: C-horizon
93 Toys, pots, and statues are made up of which soil type?
A Sandy Soil
B Clayey Soil
C Loamy Soil
D None of these

Answer: Clayey Soil
94 Lentils (masoor) and other pulses are grown in which of the following soil type?
A Sandy Soil
B Clayey Soil
C Loamy Soil
D None of these

Answer: Loamy Soil
95 Percolation rate of water is the least in ___________?
A Sandy Soil
B Clayey Soil
C Loamy Soil
D None of these

Answer: Clayey Soil
96 Which of the following soil type is loosely packed with large air spaces?
A Sandy Soil
B Clayey Soil
C Loamy Soil
D None of these

Answer: Sandy Soil
97 Find the odd one out.
A Nasal Cavity
B Nostrils
C Pharynx
D Trachea

Answer: Pharynx
98 Tiny air sacs of lungs are called ______.
A alveoli
B trachea
C bronchi
D larynx

Answer: alveoli
99 Which of the following animal can breathe through skin as well through lungs?
A frog
B cockroach
C fish
D mammal

Answer: frog
100 When we breathe out, exhaled air turns lime water into _______ due to presence of ________.
A orange, oxygen
B milky, oxygen
C milky, carbon dioxide
D milky, carbon monoxide

Answer: milky, carbon dioxide

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