Our Environment “CBSE class 10 Most Important MCQ

Our Environment “CBSE class 10 Most Important MCQ

Question:1 Disposable plastics plates should not be used because——-

1. they are made up of light weight material
2. they are made of toxic materials
3. they are made up of biodegradable materials
4. they are made up of non biodegradable materials

Question:2 what will happen if dear is missing from food chain :grass-> deer->Tiger?

1. The population of tiger will Increase
2. tiger will start eating grass
3. the population of grass decrease
4. population of tiger decrease and grass increase

Question:3 The excessive exposure of humans to UV Rays results in “

1. damage immune system
2. skin cancer
3. peptic ulcers
4. damage to lungs

Question:4 The decomposers in ecosystem”

1. Convert inorganic materials to simpler forms
2. Convert organic materials to inorganic forms
3. do not breakdown organic compounds
4. None

Question:5 In an ecosystem, the 10% of energy available for transfer from one trophic level to next in the form of ——–

1. Heat energy
2. light energy
3. Mechanical energy
4. chemical energy

Question:6 which of the following are environment friendly practices?

1. Carrying cloth bags to put purchases in while shopping
2. switching off unnecessary lights and fans
3. walking to school instead of getting your mother to drop you on her scooter
4. all

Question:7 In a food chain the third trophic level is always occupied by ——-

1. Carnivores
2. Herbivores
3. Omnivores
4. Decomposers

Question:8 Accumulation of Non-biodegradable pesticides in the food chain in Increasing amount at each higher trophic level is known as

1. Eutrophication
2. Pollution
3. Biomagnification
4. accumulation

Question;9 The constituents which do not form eco-system are—–

1. Plastic
2. biodegradable
3. all
4. Non biodegradable

Question:10 which of the following is an example of prodicers?

1. Cow
2. sun dew plant
3. Bacteria
4. grass

Question;11 which of the following is not an example of abiotic factors?

1. Light
2. plants
3. heat
4. temperature

Question:12 which of the following is terrestrial ecosystem?

1. Natural forest
2. pond
3. lake
4. aquarium

Question:13 The number of atoms of Oxygen in Ozone—–

1. 2
2. 3
3. 6
4. 7

Question:14 The function Unit of environment”

1. Ecosystem
2. Stratosphere
3. Ozone
4. Oxygen

Question:15 In food Chain” herbivores falls at——–level

1. 1st
2. 2nd
3. 3rd
4. 4th

Question:16 In food web, flow of energy is”

1. Non directional
2. Bidirectional
3. Unidirectional
4. any of above

Question;17 Following is true for food web”

1. the energy available at each level gets diminished
2. energy moves progressively through different levels
3. A and B
4. None

Question;18 Order of energy flow in Ecosystem is”

1. Sunlight->Herbivores->producers->Carnivores
2. sunlight->producers->Carnivores->Herbivores
3. sunlight->herbivores->carnivores->producers
4. sunlight->producers ->herbivores->carnivores

Question:19 which refrigerant is responsible for depletion of Ozone layer

1. CFC
2. FCC
3. FCF
4. CCF

Question:20 what percentage of sunlight is captured by plants to convert into food energy?

1. 1%
2. 10%
3. 50%
4. more than 50%

Question:21 if there is no atmosphere around the earth the temperature of earth will

1. Increase
2. Go on decreasing
3. Increase during day and decrease during night
4. Unaffected

Question:22 what would happen if all the Oxygen present in the environment is converted to Ozone?

1. we will be protected more
2. it will become more poisonous and kill living forms
3. Ozone is not stable hence it will be toxic
4. it will help harmful sun radiations to reach and damage mainly all life forms

Question;23 Among the following which one is not correct for the use of large amount of Fertilizers and pesticides?

1. They are Eco-friendly
2. they turn the fields barren after some time
3. they adversely affect the useful component from the soil
4. None

Question:24 One of the following processes is not a step involved in water cycle operating nature”

1. Evaporation
2. transpiration
3. precipitation
4. Photosynthesis

Question:25 Ozone hole Means”

1. A large sized hole in Ozone layer
2. Thinning of Ozone layer
3. small holes scattered in Ozone layer
4. Thickening of Ozone in the Ozone layer

Answer”

Q,No	Answers	Q,No	Answer
1	D	13	B
2	D	14	A
3	B	15	B
4	B	16	C
5	D	17	C
6	D	18	D
7	A	19	A
8	C	20	A
9	A	21	B
10	D	22	C
11	B	23	C
12	A	24	C
		25	B