Compulsory Science and Technology Question Paper (Model Question)

a) Which of the following is the first stage towards signal receiver?

(i) Decoder

(ii) Encoder

(iii) Demodulator

(iv) Modulator

b. Why is Cycas kept in gymnosperm?

(i) It bears flower and produces seed.

(ii) It bears flower and has pointed leaf.

(iii) It has cone instead of flower and seed is present inside fruit.

(iv) It has cone instead of flower and seed is naked.

c.When Sanju observed the specimen in the laboratory, she found that both of the organisms are long and cylindrical. She also found that organism A has cylindrical segmented body and organism B has not segmented body. By studying the above characteristics, which statement is true for these organisms?

(i) Organism A is hermaphrodite whereas organism B is unisexual.

(ii) Organism A is unisexual whereas organism B is hermaphrodite.

(iii) Organism A is diploblastic whereas organism B is triploblastic.

(iv) Organism A is triploblastic whereas organism B is diploblastic.

d. Cordyceps formed by the fusion of a caterpillar and fungi is shown in the figure. What is the interrelation between caterpillar and fungus in this process?

(i) Symbiotic

(ii) Parasitic

(iii) Saprotrophic

(iv) Commensalism

e.What would be the acceleration due to gravity of the meteor falling from 10000 km height from the centre.

(i)

(ii)

(iii)

(iv)

f. Why is swimming in sea water easier than in river?

(i) Density of sea water is more than that of river.

(ii) Density of sea water is less than that of river.

(iii) Temperature of sea water is more than that of river.

(iv) Temperature of sea water is less than that of river.

g. Sarthak named red, green, violet and blue coloured rays in dispersion of speed in a prism as , , and , respectively. Which is the correct order of speed made by him?

(i)

(ii)

(iii)

(iv)

h. What is the most realistic theory about the origin of the universe?

(i) Heliocentric theory

(ii) Geocentric theory

(iii) Newton's theory

(iv) Big Bang theory

i. What is denoted by in the given reaction?

(i) Catalyst

(ii) Heat

(iii) Pressure

(iv) Light

j. A statement and two arguments are given below.

Statement: Stomach pesticide is a type of pesticide based on mode of action.

Argument 1: In this process, the insects die when they eat leaves and fruits of the plants treated by pesticides.

Argument 2: When these pesticides come into contact with air, poisonous gas is released, due to which the insects die.

(i) Statement and argument 2 are correct but argument 1 is incorrect

(ii) Statement and argument 2 are incorrect but argument 1 is correct

(iii) Statement and argument 1 are correct but argument 2 is incorrect

(iv) Statement and argument 1 are incorrect but argument 2 is correct

Why are controlled variables important?

State Archimedes' principle.

Anu cannot distinguish red and green colour. What is the main cause of this problem?

A student of the class can see letters written on whiteboard when s/he sits on first bench and cannot see clearly when s/he sits on last bench. What type of lens is used to remove this defect?

What happens when bar a magnet is placed inside solenoid at rest?

What is the main cause of determination of future of universe?

Write the name of main ore of iron.

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?

Write a difference between the given hydrocarbons on the basis of reactivity.

Prove that electric resistance () = .

Write down any two characteristics of the class Amphibia.

Study the given concept map and name A and B.

Plaintext

[ A ] <------ Parthenogenesis ---- ( Honey ) ---- Fertilization ----> [ Fertile B ]

.Write any two differences between somatic chromosome and sex chromosome.

Draw a chart of the result obtained by crossing black mouse (BB) and hybrid black mouse (Bb).

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.

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.

Write any two effects of gravity.

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.

Study the given figure and answer the following questions

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.

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.

The property and use of a hydrocarbon compound in the given table below.

"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.

"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."

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.

Write any two symptoms of high blood pressure and any two preventive measures.

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.

.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?

Answer the following questions on the basis of electronic configuration of elements A and B given below.

A: B:

Draw a well-labelled diagram of laboratory preparation of ammonia gas and write down a method to test this gas in the gas jar.