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Free download in PDF CBSE class 10 Science Short Questions with Answers. Here Gkseries provide Science Solve Questions and Answers for CBSE class 10 Students.
141
In a hydroelectric power plant more electrical power can be generated if water falls from a greater height because:
[A]
Larger amount of potential energy is converted into kinetic energy.
[B]
More water molecules dissociate into ions.
[C]
Its temperature increases.
[D]
The electricity content water increases with height.
Answer: Larger amount of potential energy is converted into kinetic energy.
142
Coke is more valuable when used:
[A]
As a fuel in domestic ovens
[B]
As a reducing agent
[C]
As a fuel for industrial boilers
[D]
As an oxidizing agent
Answer: As a reducing agent
143
There are four fuels which all contain only carbon and hydrogen. The fuel having highest calorific value will be one which has:
[A]
Less of carbon but more of hydrogen
[B]
Less of carbon as well as less of hydrogen
[C]
More of carbon but less of hydrogen
[D]
Equal proportions of carbon and hydrogen
Answer: Less of carbon but more of hydrogen
144
A good fuel is one that possesses:
[A]
Low calorific value and moderate ignition temperature
[B]
High calorific value and moderate ignition temperature
[C]
Low calorific value and low ignition temperature
[D]
High calorific value and low ignition temperature
Answer: High calorific value and moderate ignition temperature
145
Which among the statements given below is incorrect?
[A]
Sustainable development does not take into consideration the viewpoints of all stakeholders
[B]
Sustainable development meets the current basic human needs along with preserving resources for future generations
[C]
Sustainable development is a long planned and persistent development
[D]
Economic development is linked to environmental development
Answer: Sustainable development does not take into consideration the viewpoints of all stakeholders
146
Which among the following is a major programme that was started to replenish the damaged forests?
[A]
Silviculture
[B]
Horticulture
[C]
Agriculture
[D]
Tissue culture
147
Who started chipko andalon?
[A]
Sundar lal Bahuguna
[B]
Medha patkart
[C]
A. K. Banerjee
[D]
Amrita devi bisni
Answer: Sundar lal Bahuguna
148
Among the following choose the correct option which includes acts related to the three R's strategy which can be useful for conserving our natural resources?
[A]
Reduce, reuse, redistribute
[B]
Reduce, recycle, reuse
[C]
Recycle, regenerate, reuse
[D]
Reduce, regenerate, reuse
Answer: Reduce, recycle, reuse
149
Government launched the ‘Ganga Action Plan’ (GAP) project in 1985. The main purpose of this project was to:
[A]
Make its water pollution free
[B]
Promote the growth of water animals like fish, in the river
[C]
Build new dams over the Ganga river
[D]
Utilise the river water for irrigation purposes
Answer: Make its water pollution free
150
Which among the following is an eco-friendly activity?
[A]
Making use of dyes for colouring the clothes
[B]
Making windmill to generate power for irrigation
[C]
Making use of automobiles
[D]
Making use of poly bags for shopping
Answer: Making windmill to generate power for irrigation
151
Which among the following was a message conveyed by the ‘Chipko Movement’?
[A]
To promote more and more developmental projects
[B]
To involve the community in forest conservation efforts
[C]
To ignore the forest conservation efforts in sake of development
[D]
None of these
Answer: To involve the community in forest conservation efforts
152
Global warming is a phenomenon related to:
[A]
Greenhouse effect
[B]
Desertification
[C]
Evaporation
[D]
Ecological balance
Answer: Greenhouse effect
153
Which of the following substances will not be converted to compost when added in a composting pit?
[A]
Plastic bags
[B]
Human and animal excreta
[C]
Waste paper
[D]
Fruit and vegetable peels
154
What will happen if deer is missing in the food chain given below?
Grass → Deer → Tiger
[A]
The population of tiger increases
[B]
The population of grass decreases
[C]
Tiger will start eating grass
[D]
The population of tiger decreases and the population of grass increases
Answer: The population of tiger decreases and the population of grass increases
155
Which of the following radiations is responsible for the conversion of atmospheric oxygen to ozone?
[A]
Infrared radiations
[B]
Ultraviolet radiations
[C]
Gamma radiations
[D]
Cosmic radiations
Answer: Ultraviolet radiations
156
Which among the following is a correct full form for DDT?
[A]
Dichlorodiphenyltrichloroethane
[B]
Dichlorodiethyltrichloroethane
[C]
Dichlorodiphenyltetrachloroethane
[D]
None of these
Answer: Dichlorodiphenyltrichloroethane
157
The process of accumulation of harmful chemical substances like pesticides, in the body of living organisms at each trophic level of a food chain is known as:
[A]
Chemical magnification
[B]
Biological accumulation
[C]
Biological magnification
[D]
None of these
Answer: Biological magnification
158
Green plants utilize ……… percent of sun’s energy to prepare their food by the process of photosynthesis?
[A]
99 percent
[B]
1 percent
[C]
10 percent
[D]
20 percent
159
In a food chain the second trophic level is occupied by:
[A]
Herbivores
[B]
Producers
[C]
Carnivores
[D]
Autotrophs
160
Which among the following statements is incorrect in view of the plants?
[A]
They convert the solar energy into mechanical energy
[B]
They prepare their food from organic compounds
[C]
They are also called producers
[D]
They are the initial source of energy in a food chain
Answer: They prepare their food from organic compounds
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