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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 any one difference between the following figures on the basis of their working principles.
FIGURE A FIGURE B
Draw a current-time graph of alternating current.
Draw a well labelled diagram of electrorefining process of purification of impure silver.
Why does a stone sink when dropped in water? Explain on the basis of the law of floatation.
An ore contains a mixture of iron dust and zinc sulphide. Which method can be used to separate them?
When a magnet is introduced into a coil, what happens to the needle of galvanometer? If the magnet is held at rest inside the coil, what will happen to the needle?
Provide examples of the other two categories of variables present in scientific experiments, excluding the controlled variable.
Write any two differences between frog and fish based on the habitat and the structure of heart.
Study the given figures and write any two differences between them.
fig i fig ii
Identify the health problem which has symptoms like, sweating, feeling tiredness, difficulty in respiration, feeling intolerable pain due to stress in chest, etc. Write a preventive measure of that problem.
If hot water of mass 10 kg at 90°C is mixed with 20 kg of cold water at 20°C, what is the final temperature of the water? (Specific heat capacity of mixture is 4200 J/kg°C.)
Define the process which is shown in the figure and write any one application of it.
A student mixed 10 ml ammonium hydroxide with 10 ml hydrochloric acid in a beaker.
A colourless viscous liquid hydrocarbon is used as a sweetening agent in confectionery.
Give an example of the insecticides on the basis of the targeted organism of the following.
The use of digital devices and technologies such as mobile phones and laptops is increasing in our daily lives. In this scenario, write two positive impacts and two negative impacts of digital technology.
Black-eyed offspring were born from a black-eyed father and brown-eyed mother. Why did the offspring had black-eyes but not brown in the first generation? Show the filial chart of this process up to the second generation and write down the genotypic ratio of the second generation.
The external structure of the heart is shown in the given diagram.
A stone is dropped from a tall tower that reaches the ground after 4 s. Calculate the velocity with which the stone lands on the ground.
Given,
Time taken to reach the ground from the tower
Initial velocity
Acceleration due to gravity
Final velocity
According to the formula,
or,
or,
The velocity with which the stone lands on the ground .
A student sitting at the back of his class has difficulty in reading the letters on the whiteboard placed on the front wall of the classroom, but he can read his book easily.