CBSE class 9 Science Quiz | CBSE class 9 Science Short Questions with Answers

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Questions
141 The quantity 1/λ is known as
A wave number
B wavelength
C wave velocity
D frequency

Answer: wave number
142 The period of a vibrating body of frequency 100Hz is
A 0.01 second
B 0.1 second
C 100 second
D 10 second

Answer: 0.01 second
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143 The time taken to complete one oscillation is called _________.
A time period
B wavelength
C velocity
D frequency

Answer: time period
144 A medium transmits a sound wave by virtue of its?
A density
B inertia
C elasticity
D both inertia and elasticity

Answer: density
145 Propagation of wave transfers:
A energy only
B matter only
C both energy and matter
D None of these

Answer: energy only
146 Waves produced on the surface of water are:
A Longitudinal only
B Transverse waves only
C Electromagnetic Waves
D Both Longitudinal and Transversal

Answer: Transverse waves only
147 Which of the following waves do not require any kind of medium to propagate?
A Light waves
B Water surface waves
C Sound
D Earthquake waves

Answer: Light waves
148 The number of oscillations completed in one second is called _________.
A frequency
B wavelength
C time period
D velocity

Answer: frequency
149 In which of the following, speed of the sound is maximum:
A steel
B kerosene
C air
D water

Answer: steel
150 Solar radiations heat up:
A Land faster than the water bodies
B Equally both land and water bodies
C Land slower than the water bodies
D Neither land nor water bodies

Answer: Land faster than the water bodies
151 In which sphere of the environment Ozone layer is located?
A Thermosphere
B Troposphere
C Stratosphere
D Mesosphere

Answer: Stratosphere
152 Which trophic level is considered to be the most vulnerable to extinction?
A tertiary consumer level
B secondary consumer level
C producer level
D primary consumer level

Answer: tertiary consumer level
153 Which of the following organisms is incorrectly paired with its trophic level?
A zooplankton - primary producer
B eagle - tertiary consumer
C cyanobacteria - primary producer
D honey bee - primary consumer

Answer: zooplankton - primary producer
154 Which of the following is a nonrenewable energy source?
A wind energy
B natural gas
C solar energy
D tidal energy

Answer: natural gas
155 Two important groups of detritivores are
A Prokaryotes and Fungi
B Plantae and Prokaryotes
C Animals and Plants
D Prokaryotes and Algae

Answer: Prokaryotes and Fungi
156 Green plants of an ecosystem are called.
A Producers
B Consumers
C Decomposers
D None of these

Answer: Producers
157 Corbett National Park is famous for?
A Tigers
B Rhinoceros
C Neel Gai
D None of these

Answer: Tigers
158 Where do terracing help the most in soil conservation?
A Hill regions
B Wet areas
C Deserts
D Plains

Answer: Hill regions
159 Which of the following is not a marine fish?
A catla
B sardines
C pomphret
D mackerel

Answer: catla
160 Red Sindhi, Sahilwal, Jersey, Brown Swiss are breeds of
A Cows
B Fowl
C Pigs
D Buffaloes

Answer: Cows
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