Download PDF
Free download in PDF CBSE class 9 Science Short Questions with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 9 Students.
141
The quantity 1/λ is known as
[A]
wave number
[B]
wavelength
[C]
wave velocity
[D]
frequency
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
143
The time taken to complete one oscillation is called _________.
[A]
time period
[B]
wavelength
[C]
velocity
[D]
frequency
144
A medium transmits a sound wave by virtue of its?
[A]
density
[B]
inertia
[C]
elasticity
[D]
both inertia and elasticity
145
Propagation of wave transfers:
[A]
energy only
[B]
matter only
[C]
both energy and matter
[D]
None of these
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
148
The number of oscillations completed in one second is called _________.
[A]
frequency
[B]
wavelength
[C]
time period
[D]
velocity
149
In which of the following, speed of the sound is maximum:
[A]
steel
[B]
kerosene
[C]
air
[D]
water
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
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
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
157
Corbett National Park is famous for?
[A]
Tigers
[B]
Rhinoceros
[C]
Neel Gai
[D]
None of these
158
Where do terracing help the most in soil conservation?
[A]
Hill regions
[B]
Wet areas
[C]
Deserts
[D]
Plains
159
Which of the following is not a marine fish?
[A]
catla
[B]
sardines
[C]
pomphret
[D]
mackerel
160
Red Sindhi, Sahilwal, Jersey, Brown Swiss are breeds of
[A]
Cows
[B]
Fowl
[C]
Pigs
[D]
Buffaloes
Take Mock Tests