Class 10 Science

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
Write the function of following parts in human female reproductive system
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
Trace the movement of oxygenated blood in the body
Mention any two components of blood
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
What is meant by power of a lens ? Write its SI unit
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
A compound ‘X’ on heating with excess conc. sulphuric acid at 443 K gives an unsaturated compound
Write the energy conversion that takes place in a hydropower plant
The current flowing through a resistor connected in a circuit and the potential difference
A student traces the path of a ray of light through a glass prism
Draw the path of a ray of light when it enters one of the faces of a glass
List four precautions which a student should observe while preparing a temporary mount
After examining a prepared slide under the high power of a compound microscope
List in proper sequence four steps of obtaining germinating dicot seeds
What is observed when a pinch of sodium hydrogen carbonate is added to 2 mL of acetic acid