MCQ Questions for Class 10 Science Our Environment with Answers: Students CBSE Board Exams 2020 Time Table is out now. The board is going to conduct a Class 10 CBSE Science Exam on 4th March 2020. As per their official notification, this time CBSE Exam Pattern 2020 is having slight changes. The board decided to add MCQ Questions for Class 10 CBSE Board Exams. Here, you will find important MCQs from CBSE Class 10 Science Chapter 15 Our Environment along with the answers.
CBSE Class 10 Science MCQs of Our Environment with Answers
Such Multiple Choice Type Questions are ideal to brushes your basic concepts to answer in CBSE Class 10 Science Exam 2020. Also, this objective type questions will help you to adjust with all various approaches. In this article, we have provided Our Environment MCQ Questions for Class 10 CBSE Science Exam 2020 with a detailed explanation of answers. It makes easy to grasp the in-depth concept and logic of the question. So, practice below provided MCQ’s of CBSE Class 10 Chapter 15 Our Environment topics to score maximum marks in your pre-board and final board exams.
Question 1. Excessive exposure to ultraviolet radiation causes
(a) inflammation of liver
(b) cancer of skin
(c) damage to the lungs
(d) jaundice
Answer
Answer: b
Question 2. Which one of the following is an artificial ecosystem?
(a) Lake
(b) Forest
(c) Pond
(d) Crop field
Answer
Answer: d
Question 3. Acid rain is caused by the oxides of
(a) carbon
(b) nitrogen only
(c) sulphur only
(d) sulphur and nitrogen
Answer
Answer: d
Question 4. Which of the following is biodegradable?
(a) Aluminium can
(b) Polythene bag
(c) Cowdung
(d) DDT
Answer
Answer: c
Question 5. Which of the following is an abiotic component of an ecosystem?
(a) Humus
(b) Bacteria
(c) Plants
(d) Fungi
Answer
Answer: a
Question 6. Which one of the following pairs belong to the category of primary consumers?
(a) Eagle and snake
(b) Grasshoppers & cattle
(c) Snake and frog
(d) Water beetles & fish
Answer
Answer: b
Question 7. Which of the following chemicals causes depletion of the ozone layer?
(a) Carbon tetrachloride
(b) Methane
(c) Chloro fluoro carbon
(d) Carbon monoxide
Answer
Answer: c
Question 8. In a food chain, the third trophic level is always occupied by
(a) herbivore
(b) carnivore
(c) decomposer
(d) producer
Answer
Answer: b
Question 9. The depletion of the ozone layer causes
(a) global wanning
(b) earthquakes
(c) increased UV radiations
(d) acid rain
Answer
Answer: c
Question 10. In the given foodchain if the amount of energy at the fourth trophic level is 4 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake
(a) 4 kJ
(b) 40 kJ
(c) 400 kJ
(d) 4000 kJ
Answer
Answer: d
Question 11. What will happen if all the deer are killed in the given food chain?
Grass → Deer → Lion
(a) The population of grass decreases.
(b) The population of lions increases.
(c) The population of lions remains unchanged.
(d) The population of lions decreases and grass increases.
Answer
Answer: d
Question 12. Which of the two in the following sets belong to the same trophic level?
(a) Grass; Grasshopper
(b) Goat; Spider
(c) Hawk ; Rat
(d) Frog ; Lizard
Answer
Answer: d
Fill in the Blanks
1. Those waste materials which can be broken down to non-poisonous susbtances in nature in due course of time by the action of micro-organisms are called …….. wastes.
2. The waste materials which can not be broken down into harmless substances in nature are called …….. .
3. …….. is the ultimate source of energy.
4. In 1987 …….. succeeded in forging an agreement to freeze CFC production at 1986 levels.
5. Ozone at the higher levels of atmosphere is a product of UV radiation acting on …….. molecule.
6. …….. can be classified as herbivores, carnivores, omnivores and parasites.
Answers
1. biodegradable
2. non-biodegradable wastes
3. Sun
4. United Nations Environment Programme (UNEP)
5. oxygen (O2)
6. Consumers
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