Compulsory Science and Technology Question Paper 2082 ko.p (Old Question)

If an experiment is done to find how various amount of fertilizer affect the height of tomato plant, what is the independent variable in this experiment?

i. Height of tomato plant

ii. Amount of fertilizer

iii. Amount of water

iv. Type of soil

Which of the following statements is true about baseband transmission?

i. Digital signals are converted to analog signals and sent to the channel.

ii. Separate channels are used for sending and receiving signals.

iii. Sending and receiving signals are done in the same channel simultaneously.

iv. Generally, it is used for long distance communication.

How does the plantation of trees help reduce the effects of climate change?

i. By increasing oxygen level in the atmosphere

ii. By reducing the amount of carbon dioxide through photosynthesis

iii. By lowering the temperature of the environment

iv. By making a lot of rainfall

If the weight of an object on the surface of the Moon is 66 N, what might be the weight of the object on the Earth? (Acceleration due to gravity of the Moon is 1.63 m/s²)

i. 396 N

ii. 66 N

iii. 11 N

iv. 6.6 N

How much force is produced in piston Q in the given figure?

i. 80 N

ii. 100 N

iii. 400 N

iv. 500 N

What is called the effect of heat on the volume of an object?

i. Thermal expansion

ii. Thermal conduction

iii. Thermal equilibrium

iv. Thermal radiation

If a transformer has more turns in the secondary winding than in the primary winding, which of the following statements is correct?

i. It does not change A.C. voltage.

ii. It decreases A.C. voltage.

iii. It increases A.C. voltage.

iv. It increases A.C. voltage according to the situation.

Which of the following shows the correct order of the atomic radii of the elements nitrogen, oxygen and fluorine?

i. O < F < N

ii. N < F < O

iii. O < N < F

iv. F < O < N

i. Which is the correct order of metal processing for their purification?

i. Concentration, Oxidation, Refining, Reduction

ii. Concentration, Reduction, Oxidation, Refining

iii. Concentration, Reduction, Refining, Oxidation

iv. Concentration, Oxidation, Reduction, Refining

Which of the following is a fungicide?

i. Cypermethrin

ii. Carbendazim

iii. Butachlor

iv. Zinc Phosphide

Write any one difference between rare and endangered species.

Write one medicinal use of the organism shown in the figure.

Write the principle which explains why a ship floats on water.

To which special property of water is the given graph related?

What is the relationship between thickness and focal length of a lens?

Write any one reason for elements in the same group having the same valency despite the differences in atomic size.

Write the balanced chemical equation that takes place while heating calcium carbonate.

Show the diagram of purification of impure copper by electrorefining method.

A saturated hydrocarbon has a molecular mass of 58 amu. Write its IUPAC name.

Check the validity of the equation v = u + at² by its unit-wise analysis.

Write the differences between the given organism based on the respiration and reproduction.

Write the differences between the given organism based on the respiration and reproduction.

Ans: Picture A depicts a horse, while picture B displays a sea horse.

• Respiration: Horses utilize lungs to breathe, whereas sea horses respire via gills.

• Reproduction: Horses reproduce viviparously, whereas sea horses are oviparous.

Fern does not bear flowers, pine bears flowers but not fruits and banana bears flowers as well as fruits. However, all these plants are kept in the same division. Give two reasons for this.

Study the given concept map and write the names of P and Q bees, where P and Q are formed by different processes:

Write any two differences between mitosis and meiosis cell division.

Draw a labelled chart showing the sex determination in human beings.

Study the table about the blood test of person X.

Calculate the amount of heat energy required to raise the temperature of 500 g of water from 30°C to 90°C.

Copy these figures in the answer sheet and complete the ray diagram.

How does the conclusion of Hubble's study support the Big Bang theory? Mention any two points.

Study the following electronic configuration of elements X and Y.

When a student stored dilute hydrochloric acid inside a zinc container, they noticed the container walls became thinner. Explain the reasons for this phenomenon using a balanced chemical equation.

Study the structure of the given organic compound.

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.

Write any two negative impacts of digital technology in our society. How do you use ICT to be a good digital citizen? Mention any two points.

Define Mendel's law of dominance.

Draw a chart to show both phenotype and genotype of offspring produced from dogs of black (BB) and white (bb) colour in the first and second filial generation according to Mendel's experiment. Also write the ratio of phenotype and genotype of second filial generation.

Study the given figure.

a.Why is it not possible to land safely on the Moon using a parachute?

b. Mass of the two heavenly bodies are and , respectively. If the distance between their centers is . Calculate the gravitational force between them. What would be the force of attraction if the distance between the masses is made ?

*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.

a. Write any two differences between direct current and alternating current.

b. Write any two ways of increasing electricity from a dynamo.

Look at the given figure and answer the following questions.