Class 10 Science

Both soap and detergent are some type of salts. What is the difference between them
What is meant by scattering of light
If the image formed by a mirror for all positions of the object placed in front of it is always erect and diminished
Explain with an example for each, how the following provides evidences in favour of evolution in organisms
List four points of significance of reproductive health in a society
What are chromosomes
List six specific characteristics of sexual reproduction
List two tests for experimentally distinguishing between an alcohol and a carboxylic acid and describe how these tests are performed
What is biodiversity ? What will happen if biodiversity of an area is not preserved
List two main causes of the pollution of water of the river Ganga
The absolute refractive indices of glass and water are 4/3 and 3/2 respectively
What will be the amount of energy available to the organisms of the 2nd trophic level of a food chain
Write the number of covalent bonds in the molecule of ethane
A student is viewing under a microscope a permanent slide showing various stages
Name the process by which an amoeba reproduces
List the steps of preparation of temporary mount of a leaf peel to observe stomata
What is observed when a solution of sodium sulphate is added to a solution of barium chloride
A student added few pieces of aluminium metal to two test tubes A and B
Explain the function of the following parts of an electric motor
Write the principle of working of an electric motor
State Fleming’s left hand rule
Why does the sun appear reddish early in the morning
Write the function of each of the following parts of human eye
Why do stars twinkle ? Explain
A student is unable to see clearly the words written on the black board
Describe in brief the structure and function of placenta
Draw excretory system in human beings and label the following organs of excretory system
Name the basic filtration unit present in the kidney
Define excretion
Write one structural difference between the composition of artery and veins
Write the function of valves present in between atria and ventricles
How is copper extracted from its sulphide ore
Write the steps involved in the extraction of pure metals in the middle of the activity series
What is a dam ? Why do we seek to build large dams
Students in a school listened to the news read in the morning assembly that the mountain of garbage in Delhi
Why are alloys commonly used in electrical heating devices
Why are metals good conductors of electricity whereas glass is a bad conductor of electricity
List the factors on which the resistance of a conductor in the shape of a wire depends
Write Joule’s law of heating
Show how would you join three resistors, each of resistance 9 Ω
State the laws of refraction of light. Explain the term absolute refractive index of a medium
Write one main difference between asexual and sexual mode of reproduction
Name the hormones secreted by the following endocrine glands
Write the name and structure of a saturated compound in which the carbon atoms
Why are most carbon compounds poor conductors of electricity
The pH of a salt used to make tasty and crispy pakoras is 14
2 mL of sodium hydroxide solution is added to a few pieces of granulated zinc metal taken in a test tube
Decomposition reactions require energy either in the form of heat or light or electricity for breaking down the reactants
If the image formed by a spherical mirror for all positions of the object placed in front of it is always erect and diminished
Write a and b in the given flow chart of neuron through which information travels as an electrical impulse