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Explore Class 10 Compulsory Science and Technology past and model questions by chapter, year, marks and question type.
322 questions found
Write the balanced chemical equation that takes place while heating calcium carbonate.
*A convex lens has a focal length of . Draw a ray diagram for the image formed by this convex lens when an object is kept at in front of the lens. Also, calculate its power.
*Which lens is used to remedy short-sightedness? Show with a ray diagram.
When someone left a pickle jar unsealed, causing it to spoil in a short period. Utilize food preservation principles to clarify the cause of this spoilage and state the necessary preventive measures.
study the given table
Substance | Specific heat capacity |
A | 900 J/kg°C |
B | 460 J/kg°C |
C | 380 J/kg°C |
Draw a clear diagram of the heart and label the following parts:
Look at the table for four different blood vessels and answer the following questions.
Blood types | Contains valve | Does not contain valve |
Pure blood | P | Q |
Impure blood | R | S |
A woman has given birth to four daughters consecutively. She and her husband both are in stress. She wants to explain to her family that this is simply a matter related to chromosomes. Show this with a suitable sex determination chart.
If you are given only the leaves of three plants belonging to the sub-divisions under the tracheophyta, is it possible to identify their sub-divisions? Give your logic.
Study the given diagram.
What is artificial insemination? Why are farmers attracted towards artificial insemination rather than natural fertilization nowadays? Write any one main reason.
Test the validity of power () = by unit-wise analysis.
Study the given ray diagram.
What happens to the gravitational force when the masses of two objects are kept constant and the distance between them is made half? Explain with suitable equation.
An astronomer studies two galaxies, P and Q which are very far from each other, and finds that galaxy P is at greater distance from the Earth compared to the galaxy Q. Based on these information, answer the following questions.
The number of turns in the secondary coil is 50 times more than that of the primary coil. Calculate the output voltage, if 220 V input voltage is passed through this transformer. Which type of transformer is this? Where is such transformer used?
Write any two uses of the given organism.
Differentiate between worker bee and drone bee based on their work and time period of the formation of larvae.
A pea plant with red flower and white flower are cross-fertilized and result is shown in the table.
\ | R | r |
R | RR | Rr |
r | Rr | rr |
Students spend a significant amount of time using smartphones, computers and the internet for studying, using social media and entertainment. Identify two positive and two negative effects of these technologies on their daily life.
A candle is kept at a distance of 3 cm from a convex lens having focal length 2 cm. Draw the ray diagram to show the position and state the nature of image formed by it.