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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
Which one of the following is the cause of climate change?
i. Burning of fossil fuels
ii. Afforestation
iii. Noise pollution
iv. Use of organic fertilizer
Draw a well labelled diagram of dispersion of light in a prism.
In the laboratory, Pratik chose electro-refining process to purify copper obtained from reduction process. He connected impure copper to negative terminal of cell and pure copper to positive terminal of cell and copper sulphate is used for electrolyte. What is the mistake he made in this process?
Draw a well-labelled diagram of laboratory preparation of ammonia gas and write down a method to test this gas in the gas jar.
Answer the following questions on the basis of electronic configuration of elements A and B given below.
A: B:
.Answer the following questions.
(i) Write any two differences between convex lens and concave lens.
(ii) Between air and glass, air is called rarer medium and glass is called denser medium, why?
The relation between volume of water and temperature is shown in the given graph. Study the graph and answer the following question.
(i) What is the special property of water shown in the picture called?
(ii) Write the change that takes place in the density of water on heating water from 0°C to 10°C.
(iii) Write any one effect of this special property of water.
Write any two symptoms of high blood pressure and any two preventive measures.
Read the news paper article and answer the questions that follow.
A copying machine for living beings?
Without any doubt, if there had been elections for the animal of the year 1997, Dolly would have been the winner! Dolly is a Scottish sheep that you see in the photo. But Dolly is not just a simple sheep. She is a clone of another sheep. A clone means: a copy. Cloning means copying from a single master copy.
Scientists succeeded in creating a sheep (Dolly) that is identical to a sheep that functioned as a 'master copy'.
It was the Scottish scientist Ian Wilmut who designed the 'copying machine' for sheep. He took a very small piece from the udder of an adult sheep (sheep 1).
From that small piece he removed the nucleus, then he transferred the nucleus into the egg-cell of another (female) sheep (sheep 2). But first he removed from that egg-cell all the material that would have determined characteristics in a lamb produced from that egg-cell.
"A blog addressed at https://www.celebree.com/blog/resources/the-pros-and-cons-of-technology-in-education/ writes: ......... Technology has become a foundational component in many areas of our daily lives, as well as our children's. Within the confines of the classroom and learning environment, technology can be both beneficial and problematic for students."
"A part of opinion of Mr. Abhishekh Khadka published in the 'My Republic' on 28 April 2023 is given here - ......... "In Nepal, the use of calcium carbide to ripen fruits is prohibited under the Food Act of 1967. Artificial ripening using chemicals such as calcium carbide can have determinantal effects on human health, including poisoning and neurological damage.
" Answer the following questions on the basis of this part.
The property and use of a hydrocarbon compound in the given table below.
Property | Use | |
|---|---|---|
Colourless and viscous fluid with sweet taste | Use as sweetening agent in confectionery | |
Suppose an equal volume of hydrochloric acid is kept in conical flasks A, B and C. If 10 gram powder limestone is kept in A and C, and piece of 10 gram limestone is kept in B, in which conical flask rate of chemical reaction is fast? Write with reason.
Niva made the device as shown in the figure but rate of rotation of coil is found less. What should be done to increase the rate of rotation of coil? Write any two methods.
Study the given figure and answer the following questions
Kabin dropped a stone from a tower of 49 m high. One second later, he throws another stone. They both hit the ground at the same time. Find out the velocity with which he threw the second stone.
Despite the medicinal herbs in our locality, we are dependent upon imported medicines. Write its one cause. What can we do to increase the use of medicinal herbs? Write a point.
White blood cell of Renu's blood is found 2500 after examining her blood. What are the possible causes of this? Write any two causes.
Draw a chart of the result obtained by crossing black mouse (BB) and hybrid black mouse (Bb).
Write any two effects of gravity.