Compulsory Science and Technology Question Paper 2082 BP (Old Question)

a. An individual's blood analysis reveals an elevated sugar concentration. What physical signs might this individual have observed?

i. Joint pain

ii. Deep pain in muscles

iii. Excessive hunger and thirst

iv. Heart attack

Which of the following is a group of medicinal herbs found in Nepal?

i. Neem, Holy basil, Corn

ii. Caterpillar fungus, Aloevera, Millet

iii. Holy basil, Caterpillar fungus, Paddy

iv. Malabar nut, Calamus, Caterpillar fungus

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

What will be the weight of the stone on the surface of the Earth if it weighs 78.4 N on the surface of the Moon?

i. 380 N

ii. 490 N

iii. 590 N

iv. 690 N

On which principle is the given instrument based?

i. Archimedes' principle

ii. Pascal's law

iii. Law of gravitation

iv. Snell's law

What type of energy transformation is done by the given instrument?

i. Chemical energy to electrical energy

ii. Electrical energy to light energy

iii. Magnetic energy to electrical energy

iv. Electrical energy to magnetic energy

Which of the following electronic configurations is the electronic configuration of the element with valency 2?

i.

ii.

iii.

iv.

Which of the following sequences represent the correct order of increase in chemical reactivity of metals?

i.

ii.

iii.

iv.

Three beakers labelled as A, B and C each containing of water were taken. A small amount of , anhydrous and were added to the beakers A, B and C, respectively. It was observed that there was an increase in temperature of the solution in beakers A and B whereas in beaker C, the temperature of the solution decreased. Which one of the following statements is correct?

i. In beakers A and B, exothermic and in beaker C endothermic reaction has occurred.

ii. In beakers A and B, endothermic and in beaker C exothermic reaction has occurred.

iii. In beakers A, B and C exothermic reaction has occurred.

iv. Concept of heat cannot be developed by this information.

Which one of the following ores is converted into metallic oxide by calcination method?

i. Bauxite

ii. Siderite

iii. Cuprite

iv. Hematite

What is the dependent variable in a process of making a solution by dissolving solute in a solvent?

Draw a labelled graph to show a digital signal.

Lack of which component in blood causes anaemia?

Give any one reason of declining animals like tiger, rhino, red panda, etc. in Nepal in recent years?

What is the weight of the given object in water?

While walking on a coal-tarred road on a sunny day, a pool of water appears ahead. Which property of light is responsible for this?

Why are the elements of group 1 in the periodic table called alkali metals?

How does the metallic property vary in a period in the modern periodic table?

Write the roasting process on the basis of purification of impure metal?

Check the correctness of the equation by using unit-wise analysis.

Write any two advantages that can be taken by the students for their studies from digital technology.

Write the steps to make a video shorter by cutting a longer video.

Octopus cannot be kept under phylum Echinodermata even though it is a marine animal. Give any two reasons.

Why are Pteridophytes considered to be more developed than Bryophytes? Give any two reasons.

Bee farming (apiculture) is beneficial for the farmers. Clarify with any two points.

Draw a sex determination chart of the offspring produced by a mother with chromosomes () and father with chromosomes ().

Write the differences between DNA and RNA on the basis of function and structure.

Calculate the force of gravitation between the heavenly bodies P and Q on the basis of information given in the figure.

Write any two differences between free fall and weightlessness.

Draw a well labelled diagram of dispersion of light in a prism.

Study the given graph related to the future of the universe.

Write the balanced chemical equation of the reaction between aluminium and dilute sulphuric acid.

Write any two differences between soap and detergent on the basis of their presence of chemicals and efficiency.

Explain IVF process with a suitable figure. Write any two differences between inbreeding and line breeding.

A report of blood test of a person is shown in the chart.

Study the given graph.

Identify the type of defect of vision shown in the figure.

The optical disorder illustrated in the diagram is myopia or short-sightedness.

A. a microwave oven has a ratio of secondary to primary windings equal to . IF the microwave oven is connected to a source of 220 v,calculate the secondary voltage obtained from the transformer .

b. Which type of transformer is this? Draw the model figure of such a transformer.

Draw a well labelled diagram of the laboratory preparation of the gas formed by the reaction between calcium carbonate and dilute hydrochloric acid.

a.What is meant by homologous series of hydrocarbon?

Ans: A homologous series is described as a family of related organic compounds sharing comparable molecular structures and consistent chemical traits, where neighboring members vary progressively by a increment.

b. An example of a homologous series of hydrocarbons is given in the table alongside. | Compound | Homologous Series | | :--- | :--- | | A | | | B | | | C | |

(i) Write the IUPAC name of the compound 'B'.

Ans: The systematic IUPAC identifier corresponding to compound 'B' is propane.

(ii) Write the structural formula of the compound formed when one hydrogen atom of compound 'A' is disabled by '-OH'.

Ans: Exchanging a single hydrogen atom on compound 'A' with a hydroxyl group produces ethyl alcohol.

H ──C───C───H +OH ► H ──C───C───OH │ │ │ │ H H H H (Ethane) (Ethyl alcohol)

(iii) Write the general molecular formula of the compound formed when one hydrogen atom from each of two middle carbon atoms is removed from the compound 'C'.

Ans: Eliminating one hydrogen atom from both central carbon atoms of compound 'C' yields butene, which is represented by the chemical formula .