Which one of the following statements is not correct?

Statement 3 is incorrect because the capacity to do work is defined as energy, not power [1]. Power is scientifically defined as the rate of doing work or the rate of energy consumption [1]. Statement 1 is correct as the Kelvin scale is the absolute temperature scale where 0 K represents absolute zero. Statement 2 is correct; while the full visible spectrum can range from 380 to 780 nm, it is commonly approximated as 400—700 nm in scientific contexts. Statement 4 is also correct; in the electromagnetic spectrum, Gamma rays have higher frequencies and shorter wavelengths (as short as 10⁻¹⁵ m) compared to X-rays. Therefore, the definition of power as the 'capacity to do work' is the only false statement among the options provided.

Sources

1. [1] Science , class X (NCERT 2025 ed.) > Chapter 11: Electricity > 11.8 ELECTRIC POWER > p. 191