Science and Technology - Grade 9 Scientific Learning

Practice questions covering the scientific process, historical discoveries in physics, biology, and chemistry, laboratory safety, and scientific notation.

What are the sequential steps of scientific learning presented in figure 1.2?

Observation Curiosity, Question for research, Hypothesis building, Testing from experiment, Result and conclusion, Hypothesis testing (Proved hypothesis or unproven hypothesis), and Report.

What happens during the scientific learning process if a hypothesis is not justified?

The hypothesis can be modified and all the steps of scientific learning are repeated.

What specific scientific process skills are included in Grade 9 scientific training?

Observation, questioning, classification, prediction, interpretation, measurement, concluding, and communication.

In the tea kettle observation, what conclusion is drawn regarding the rate of formation of water droplets?

The temperature of the striking surface plays a role in the rate of formation of water droplets; if a hot plate is used instead of a cold one, formation decreases.

How does the department of weather forecast predict the amount of rainfall?

By collecting and analyzing data on how temperature decreases with an increase in the height of the earth's surface.

Who discovered the law of gravitation that acts between any two masses?

Sir Issac Newton.

What did the Nepalese surgeon Dr. Sanduk Ruit discover to treat eye cataracts?

The intraocular lens.

Which organization in Nepal developed varieties of Nutritive maize?

Nepal Agricultural Research Council (NARC).

Who invented the atomic theory mentioned in the chemistry section?

John Dalton.

According to the lecture, how did Mendeleev classify the elements?

On the basis of atomic weight.

Why is it recommended to use a water bath when heating alcohol in a laboratory?

To prevent alcohol from burning and causing accidents, as it is safe to heat by keeping it in hot water.

What is the correct procedure for diluting acid?

The acid is kept slowly on the water; water is never directly added to acid for its dilution.

What was the cause of Marie Curie's death according to the notes?

Leukemia disease resulting from radiation exposure from radioactive substances during unsafe experiments.

Who discovered the steam engine, leading to a transformation in transportation technology?

James Watt.

What event occurred at the Fukushima atomic power plant in 2021?

The plant was damaged by a Tsunami and toxic radiation was released into the environment.

When and where did an atomic power plant explosion cause destruction to human health in Ukraine?

In 1986, at Chernobyl.

What are the base and coefficient rules for scientific notation?

The base is always $10$ and the coefficient is always an integral number from $1$ to $9$.

How is the length of the east-west highway ($1030000\,m$) expressed in scientific notation?

$1.030 \times 10^6\,m$.

What is the scientific notation for the size of the Corona virus as listed in the conversion steps?

$-1 \times 10^{-7}\,m$.

What is the metric prefix for the multiplier $\times 1000$?

kilo-

What is the metric prefix and value for a decimeter in relation to a meter?

deci-; $1/10$.

What is the estimated hydropower of Nepal expressed in Megawatts?

$83,000\,\text{Megawatt}$.