Tag: science & technology

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.

Robert Frost, the American poet, wrote 'The Road Not Take' - one of his most famous and frequently anthologized poems. It explores themes of choice and the paths we choose in life.

Solving by elimination: multiply first equation by 4 (20x + 12y = 260) and second by 3 (39x + 12y = 450). Subtracting gives 19x = 190, so x = 10. Substituting back: 5(10) + 3y = 65, so 3y = 15 and y = 5.

The adult human body has 206 bones. This is a fundamental fact in human anatomy. The other options (407, 316, 306) are all incorrect numbers.

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.