Grade 5 Science: 10 Free Practice Questions

Answer: Biosphere
Overfishing removes large numbers of living organisms from an ecosystem, directly disrupting the biosphere by altering food webs and population balances.

Answer: Quantitative data, because it consists of numerical measurements
Quantitative data consists of numerical measurements, such as a specific temperature reading in degrees, which is exactly what the student recorded using the thermometer. Qualitative data describes observations using descriptive words rather than numbers, such as "the water feels warm," and this recorded measurement is neither a hypothesis, which is a testable prediction, nor a controlled variable, which is a factor deliberately held constant.

Answer: Sunlight, water, and air
Most plants require sunlight, water, and air to survive and carry out photosynthesis. Darkness, sugar, meat, and bones are not basic requirements for plant survival.

Answer: precipitation
Rain waters the crops.

Answer: A spring scale
A spring scale measures the strength of a force, such as weight or a pulling force, by measuring how much a spring stretches or compresses in response to that force. A thermometer measures temperature, a graduated cylinder measures liquid volume, and a stopwatch measures elapsed time, none of which measure force.

Answer: The sugar is still sugar; only its size and shape have changed, not its chemical makeup
Crushing changes the size and shape of the sugar but does not alter its chemical composition; it remains sugar with the same properties (taste, solubility, chemical formula). No new substance is formed, so it is a physical change.

Answer: It shows that particles of the solute spread out and mix evenly between the particles of the solvent, while both still exist
The particle model explains dissolving by describing how solute particles disperse and become evenly distributed among the moving solvent particles. Both the solute and solvent particles continue to exist; none are destroyed or newly created.

Answer: Balance
A balance compares the mass of an object to known masses (or uses a calibrated scale) to determine mass. A graduated cylinder measures liquid volume, a thermometer measures temperature, and a ruler measures length.

Answer: The shorter, tighter string vibrates faster, producing a higher frequency and higher pitch
A shorter, more tightly stretched string vibrates at a higher frequency, meaning it completes more vibrations per second, and higher frequency vibrations are perceived by the ear as higher pitch. Longer, looser strings vibrate more slowly, at a lower frequency, producing a lower pitch, which is the opposite of what is described in the incorrect options.

Answer: Particles in hot water move faster and collide with sugar particles more often, speeding up dissolving
In hot water, particles have more energy and move faster, causing more frequent and more energetic collisions between water particles and sugar particles, which speeds up the dissolving process compared to cooler water. Particles in cold water actually move slower, not faster, than in hot water, sugar can dissolve in cold water, just more slowly, and temperature clearly does affect dissolving rate, contrary to the claim that it has no effect.