JEE Physics - MCQ Practice Questions

In a p-type semiconductor, the majority carriers are:

When a p-n junction is reverse biased, the width of the depletion region:

The current gain β (beta) of a BJT is defined as:

A rectifier circuit uses a silicon diode with V_f = 0.7V and a germanium diode with V_f = 0.3V at the same forward current. Which statement is CORRECT regarding their applications in 2024 technology?

A wave travels with a velocity of 300 m/s and has a frequency of 150 Hz. What is its wavelength?

Which of the following is a characteristic of transverse waves?

Two waves of the same frequency interfere constructively. The resultant amplitude is:

A string of length L is fixed at both ends. The fundamental frequency is f₁. What is the frequency of the second harmonic?

Standing waves are formed when:

The velocity of a transverse wave on a string depends on:

When a longitudinal wave travels through a medium, particles undergo:

A wave travels on a string with velocity v = 20 m/s. If the frequency is 50 Hz, what is the wavelength?

Two waves of frequencies 256 Hz and 260 Hz are produced simultaneously. What is the beat frequency?

The equation of a wave is y = 5sin(2πt/0.04 - 2πx/0.8) m. What is the wave velocity?

A tuning fork vibrates at 440 Hz. If the speed of sound is 330 m/s, what is the wavelength of sound produced?

The intensity of a sound wave at distance r from a point source varies as:

A standing wave is formed on a string. At a node, the particle velocity is always:

Energy of a harmonic wave is proportional to:

A wave travels along a string with velocity v = 20 m/s. If the frequency is 50 Hz, what is the wavelength?

The speed of light in a medium is 2×10⁸ m/s. What is the refractive index of the medium?