Environmental Science & Computer Technology Quiz

BEAM robotics emphasizes simple control circuits using minimal components. TTL (Transistor-Transistor Logic) is a digital logic family that can be used to implement the nervous network behaviors characteristic of BEAM robots. While BEAM often uses discrete analog components, TTL logic circuits provide a viable implementation path for these biomimetic systems.

The AVR microcontroller family, developed by Atmel (now Microchip), was one of the first to feature on-chip flash memory for program storage. This made it revolutionary compared to contemporary options like the 8051 (which typically used external ROM/EPROM) and early PIC microcontrollers (which used EPROM). The flash memory allowed for easy reprogramming without UV erasure.

A standard 16x16 micromouse maze has 256 cells. Using the flood fill algorithm, each cell requires 2 bytes (one for mapping/distance value and one for visited state or direction). Additionally, the algorithm needs working memory for the stack/queue during traversal. This brings the total to approximately 512 bytes - a reasonable footprint for resource-constrained microcontroller systems.

Lithium-polymer batteries are lighter than lithium-ion batteries with equivalent capacity due to their pouch-style flexible packaging that eliminates the rigid metal canister. Both Li-ion and Li-polymer offer superior energy density compared to older Ni-Cd and Ni-MH chemistries, but the polymer variant's construction makes it the lightest option per unit of energy stored.

Servo motors typically deliver higher torque than stepper motors of similar size due to their closed-loop feedback system and optimized gear trains. The feedback mechanism allows servos to apply maximum available torque to maintain position, while steppers may skip steps if overloaded. Additionally, servo gearing multiplies torque effectively, making them superior for high-torque applications.

DRAM (Dynamic Random Access Memory) requires periodic refreshing because it uses capacitors that leak charge over time. SRAM uses flip-flops and doesn't need refreshing. PROM and EPROM are types of ROM that don't require refreshing.

Standard HDD RPM speeds are 5400, 7200, 10000, and 15000 RPM. 8700 RPM is not a standard commercial hard drive speed and would be an unusual or non-existent specification in the market.

The speed of light in vacuum is approximately 3 x 10^8 m/s, commonly rounded to this value in most educational contexts. While more precise values exist (299,792,458 m/s), option C is the accepted standard approximation for the speed of light.

Amoeba moves through pseudopodia at a very slow rate. Option A (1 x 10^-3 m/hour) is the correct order of magnitude for amoeba movement velocity. The other options are either too fast or incorrect.

Seawater contains dissolved salts, predominantly sodium chloride (NaCl), which accounts for about 2.5-3.5% of seawater by weight. Other elements like Na (sodium) and Fe (iron) are present in much smaller quantities, and sulfuric acid (H2SO4) is not a major component.

Benzene is a known carcinogen present in unleaded petrol as part of the aromatic hydrocarbon blend used to increase octane rating. Lead was used in leaded petrol, not unleaded petrol, and has been phased out. Methane and toluene are not classified as carcinogens in the same way as benzene.

The Montreal Protocol is the international treaty that specifically phases out ozone-depleting substances (ODs) like CFCs with binding time limits and reduction targets. The Vienna Convention provides the framework but does not contain phase-out schedules. The Basel Convention deals with hazardous waste management, while the Kyoto Protocol targets greenhouse gas emissions.

Sulphur dioxide (SO2) is the primary gas emitted from power stations burning coal or oil that reacts with atmospheric water to form sulphuric acid, the main component of acid rain. Nitrogen oxides also contribute, but SO2 from sulphur-containing fossil fuels is the dominant cause of acid rain from power generation.

Hemp is an exceptionally versatile plant that can be used for paper, textiles, construction materials (hempcrete), food (seeds, oil), medicine, biodegradable plastics, and even biofuel. Its fast growth and minimal pesticide requirements make it an efficient sustainable resource. Bamboo, plantain, and coconut are useful but not as broadly applicable as hemp.

The Kyoto Protocol's primary goal is to legally bind developed countries to reduce greenhouse gas emissions (specifically CO2, methane, N2O, HFCs, PFCs, and SF6) by setting binding targets. It does not address ozone layer depletion (that's the Montreal Protocol) or endangered species protection. While it encourages green technologies indirectly, its core mechanism is binding emission reduction commitments.