Neet 2005 PYQ Free Mock Test

Assertion: In a common emitter transistor amplifier the input current is much less than the output current.Reason: The common emitter transistor amplifier has very high input impedance.

Assertion: A body that is a good radiator is also a good absorber of radiation at a given wavelength.Reason: According to Kirchhoff's law the absorptivity of a body is equal to its emissivity at a given wavelength.

Assertion: In pressure-temperature ($P$ -$T$) phase diagram of water, the slope of the melting curve is found to be negative.Reason: Ice contracts on melting to water.

Assertion: For higher temperatures the peak emission wavelength of a black body shifts to lower wavelengths.Reason: Peak emission wavelengths of a blackbody is proportional to the fourth-power of temperature.

Assertion: For Reynold number $R_e>2000$, the flow of fluid is turbulent.Reason: Inertial forces are dominant compared to the viscous forces at such high Reynold numbers.