All practice questions

During soil profile development in humid regions, percolating water washes fine clay particles, iron, and aluminum oxides downward from the upper topsoil layer. In which soil profile horizon do these translocated materials primarily accumulate?

A body is weighed on a distant planet where the acceleration due to gravity is $4\text{ m s}^{-2}$. A spring balance calibrated on Earth ($g = 10\text{ m s}^{-2}$) gives a reading of $20\text{ N}$ for the body on this planet. What is the mass of the body as measured by a beam balance on the planet?

A cell with an electromotive force (e.m.f.) of $15.0\text{ V}$ and an internal resistance of $2.0\ \Omega$ is connected across a parallel combination of two resistors with resistances of $6.0\ \Omega$ and $12.0\ \Omega$. What is the potential difference across the parallel resistor network?

An agricultural survey conducted in a tropical region identified a commercial farming system characterized by large land holdings, monoculture production of cash crops, high capital investment, reliance on hired labor, and direct integration with export processing facilities. Which agricultural system is best described by these operational features?

At a weather station, a meteorological observer inspects an instrument equipped with a flexible, partially evacuated corrugated metal capsule that expands and contracts in response to changes in atmospheric conditions. Which weather element does this instrument measure, and what is its standard unit of measurement?

A Vernier caliper has $20$ divisions on its Vernier scale that coincide with $19$ main scale divisions of $1\text{ mm}$ each. When the jaws of the instrument are brought together without any object, the zero of the Vernier scale lies to the right of the main scale zero mark, and the $3\text{rd}$ Vernier division coincides with a main scale mark. When used to measure the thickness of a wooden block, the main scale reads $3.5\text{ cm}$ and the $12\text{th}$ Vernier division coincides with a main scale line. What is the actual thickness of the wooden block?

In Nigeria's domestic commercial trade network, agricultural commodities move between distinct ecological zones to satisfy regional demand. While timber, palm oil, and kola nuts are shipped northward from the humid southern rainforests, which of the following commodity groups forms the major reverse trade flow transported from the northern savanna regions to southern urban markets?

Arrange the following sequential stages of a satellite remote sensing and GIS land-use mapping workflow in the correct order from initial energy capture to final spatial analysis.

X-rays undergo diffraction when passed through crystalline solids because the interplanar atomic spacing of a crystal lattice is comparable to the wavelength of X-rays.

Match each climatic control on the left with its primary physical impact on global atmospheric and weather patterns on the right.

In an isolated system of colliding bodies where no net external force acts, total linear momentum is conserved only if the collision is perfectly elastic.

In agricultural geography, land-use intensity increases as fallow periods shorten and labor inputs per unit area rise. Arrange the following tropical agricultural land-use practices in sequence from the lowest land-use intensity (longest fallow duration) to the highest land-use intensity (continuous cropping).

A meteorological technician at an airfield weather station needs to measure atmospheric pressure to assist aircraft pilots with altimeter settings. Which measuring instrument must be used, and in what standard unit is this atmospheric parameter recorded?

Consider the following West African nations: Ghana, Senegal, Côte d'Ivoire, and Nigeria. To which regional economic grouping do these countries belong as core member states seeking to foster sub-regional integration and free movement of goods and people?

A voltmeter having an internal resistance of $900\ \Omega$ is connected across the terminals of a cell with an electromotive force (e.m.f.) of $1.50\text{ V}$ and an internal resistance of $100\ \Omega$. What is the reading on the voltmeter?

In recent decades, rapid urbanization across East African nations such as Kenya and Tanzania has led to significant demographic shifts. When analyzing population movements from rural agricultural districts to major urban metropolitan areas like Nairobi, which of the following represents a primary economic pull factor drawing migrants to these urban destinations?

A spring balance is calibrated in kilograms at sea level where $g = 10.0\text{ m s}^{-2}$. An object measured with an equal-arm beam balance at sea level is found to have a mass of $36.0\text{ kg}$. If this object is taken to a high altitude where $g = 9.0\text{ m s}^{-2}$ and suspended from the same spring balance, what reading will the scale of the spring balance display?

A cell with an electromotive force (e.m.f.) of $12.0\text{ V}$ and an internal resistance of $1.5\ \Omega$ is connected in series to an external resistor of $8.5\ \Omega$. What is the terminal potential difference across the cell?

Match each meteorological instrument on the left with its corresponding physical operational principle on the right.

An electric immersion heater rated at $1.5\,\text{kW}$ is operated on a $240\,\text{V}$ mains supply for $14\,\text{minutes}$. Calculate the total electrical energy consumed by the heater during this period, in megajoules ($\text{MJ}$).