JEE Physics - MCQ Practice Questions

Channel length modulation in a MOSFET leads to:

The quantum well structure in modern semiconductors is primarily used for:

Heterojunctions (like AlGaAs/GaAs) provide advantages over homojunctions primarily because:

In a Zener diode, breakdown voltage is primarily determined by:

In a tunnel diode, the negative resistance region occurs due to:

The transconductance parameter μ_n × C_ox in a MOSFET depends on:

In FinFET technology (used in modern 7nm and 5nm nodes), multiple gates are used to:

In a CMOS inverter circuit, the propagation delay is minimized when:

In a BJT transistor, the Early effect causes the collector current to increase slightly with increasing reverse bias on the collector-base junction. This is due to:

A transverse wave on a string has amplitude A, wavelength λ, and speed v. The maximum velocity of a particle is:

A progressive wave y = 10sin(100πt - 0.01πx) cm is given. The wavelength is:

In a resonance tube experiment, the first resonance length is l₁ and second is l₂. The end correction is approximately:

Two waves with intensities 4I and I interfere. The maximum intensity is:

A string of mass 100 g and length 2 m is fixed at both ends. If tension is 200 N, what is the frequency of the fundamental mode?

Two coherent sources with intensity ratio 4:1 interfere. The maximum intensity in the interference pattern is:

A sound wave traveling in air at 340 m/s encounters a wall. The reflected wave interferes with the incident wave. At what distance from the wall is the first antinode?

Two speakers emit sound of wavelength 1 m with a phase difference of π radians. An observer is located 2 m from both speakers. The path difference at the observer's location is 0.5 m. The intensity at the observer's location will be:

A standing wave is formed on a string with 4 antinodes. The length of the string is 2 m. What is the wavelength?

A resonance tube experiment shows that the first resonance occurs at a length of 9 cm. The next resonance occurs at 27 cm. The end correction of the tube is approximately:

An observer moving at velocity v_o towards a stationary sound source of frequency f hears a frequency f'. The relationship is best represented by: