Class 10 Science

We do not clean pond in the same manner as we do in an aquarium
List two human-made ecosystems
What is ozone? How is it formed in the upper layers of the Earth's atmosphere
Draw the pattern of magnetic field lines of the magnetic field produced by a solenoid
What is a solenoid
An alpha particle while passing through a magnetic field gets projected towards north
Name and state the rule to determine the direction of force experienced by a current carrying straight conductor
If 100 plants are produced in F2 progeny, then how many plants will show the recessive trait
If the plants of F1 progeny are self-pollinated, then what would be observed in the plants of F2 progeny
In a cross between violet flowered plants and white flowered plants, state the characteristics of the plants obtained in the F1 progeny
What is variation? List two main reasons that may lead to variation in a population
Which one of the two multicellular organisms Spirogyra and Planaria reproduces by regeneration and why
List the two reproductive parts of a bisexual flower
Which of the following flowers will have higher possibility of self-pollination
The electrons in the atoms of two elements X and Y are distributed in three shells
Carbon compounds have low melting and boiling points
Write the molecular formula of the following carbon compounds
A 4 cm tall object is placed on the principal axis of a convex lens
Students were asked to observe the permanent slides showing different stages of budding in yeast under high power of a microscope
When you add sodium hydrogen carbonate to acetic acid in a test tube
A student traces the path of a ray of light through a triangular glass prism for different values of angle of incidence
A student traces the path of a ray of light through a rectangular glass slab for the different values of angle of incidence
A student used a device (X) to obtain/focus the image of a well illuminated distant building on a screen
A student obtains a sharp image of the distant window (W) of the school laboratory on the screen (S) using the given concave mirror
Given below is the list of vegetables available in the market
A student was asked to observe and identify the various parts of an embryo of a red kidney bean seed
A student takes about 4 mL of distilled water in four test tubes marked P, Q, R and S
While preparing soap a small quantity of common salt is generally added to the reaction mixture of vegetable oil and sodium hydroxide
What do we observe on pouring acetic acid on red and blue litmus papers
Write the importance of ciliary muscles in the human eye
One half of a convex lens of focal length 10 cm is covered with a black paper
What is meant by power of a lens ? Define its S.I. unit.
How do Mendel’s experiments show that the
Name the parts of the human female reproductive system where
Name the human male reproductive organ that produces sperms and also secretes a hormone
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
Draw the electron-dot structure for ethyne. A mixture of ethyne and oxygen is burnt for welding
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
Name the life process of an organism that helps in the growth of its population
Write the number of covalent bonds in the molecule of ethane