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Home/class 10th science cbsc sample paper

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Charlie
Poll
Charlie
Asked: December 16, 2021In: Class 10 Science

Which of the following statements are incorrect?

(i) Non-biodegradable biological in origin. wastes are (ii) Biodegradable wastes are degraded by microorganisms such as bacteria and fungi. (iii) Biodegradable wastes enter the food chain and get biologically magnified. (iv)Non-biodegradable absorbed by plants from the soil. wastes are

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 15 Views
  • 2 Votes
Answer
Amarjeet
Poll
Amarjeet
Asked: December 16, 2021In: Class 10 Science

At the time of sunrise and sunset

Red light being of longest wavelength scatters least and reaches our eye while blue colour scatters most.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 7 Views
  • 2 Votes
Answer
Charlie
Poll
Charlie
Asked: December 16, 2021In: Class 10 Science

It was observed that at places where DDT was used to control mosquitoes and other pests, the eggs of eagles would become fragile and break and the eagle almost became extinct. After DDT was banned by lawmakers, eagle population has recovered. The possible reason for this is:

DDT is a non-bio degradable pesticide and when sprayed, it finds its way to soil from where it enters the food chain, the concentration of DDT increases progressively as we go up the trophic level due to biological magnification.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
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  • 2 Votes
Answer
Amarjeet
Poll
Amarjeet
Asked: December 16, 2021In: Class 10 Science

The phenomenon when concentrations of a harmful substance increases in organisms at higher trophic levels in a food chain or food web is:

When pesticides and other non-biodegradable chemicals enter the food chain, these get accumulated progressively at each trophic level and this is known as biological magnification.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 14 Views
  • 2 Votes
Answer
Amarjeet
Poll
Amarjeet
Asked: December 16, 2021In: Class 10 Science

The colour of sky appears blue, it is due to the

The sky appears blue due to excessive scattering of blue light by the air molecules.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 10 Views
  • 2 Votes
Answer
Anu Joshi
Poll
Anu Joshi
Asked: December 16, 2021In: Class 10 Science

A student while walking on the road observed that a cloud of black smoke belched out from the exhaust stack of moving trucks on the road. Choose the correct reason for the production of black smoke:

The limited supply of air leads to incomplete combustion of fuel, which in turn leads to the production of black smoke.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 152 Views
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Answer
Anu Joshi
Poll
Anu Joshi
Asked: December 16, 2021In: Class 10 Science

Identify the types of chemical reaction occurring during the combustion of fuel:

Oxidation is the addition of oxygen to a substance or the removal of hydrogen from a substance. The reaction in which heat energy is produced is called exothermic reaction.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 9 Views
  • 2 Votes
Answer
Mamta Kamari
Poll
Mamta Kamari
Asked: December 16, 2021In: Class 10 Science

To an astronaut in a spaceship, the colour of earth appears

As, light is scattered by the air molecules present in atmosphere and blue colour has shorter wavelength, so it is scattered most and the earth would appear blue.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 11 Views
  • 2 Votes
Answer
Balwant singh
Poll
Balwant singh
Asked: December 16, 2021In: Class 10 Science

Which of the following statement is incorrect about ionic compounds?

Class 10th Science Session 2022-23 Class 10 Science Terminal Exams MCQ Solutions Class X Science MCQ Extra Questions Answers 10th Science Terminal Exam Based MCQ Extra Questions

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 24 Views
  • 2 Votes
Answer
Anu Joshi
Poll
Anu Joshi
Asked: December 16, 2021In: Class 10 Science

On the basis of evolution/absorption of energy, which of the following processes are similar to combustion of fuel?

(i) Photosynthesis in plants (ii) Respiration in the human body (iii) Decomposition of vegetable matter (iv) Decomposition of ferrous sulphate.

class 10 science mcq solutionsclass 10th science cbsc sample paper
  • 1 1 Answer
  • 464 Views
  • 1 Vote
Answer
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