MDCAT Preparation MCQs
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Answer: TIR occurs from denser to rarer medium when angle exceeds critical angle.
Answer: Refractive index n = c/v, speed in vacuum over speed in medium.
Answer: Red light has the longest wavelength (~700 nm) in visible light.
Answer: v = c/n = 3x10^8/1.5 = 2x10^8 m/s.
Answer: Solar radiation pressure pushes the comet\'s tail away from the Sun.
Answer: Young\'s experiment proves wave nature of light through interference.
Answer: Light travels at maximum speed (3x10^8 m/s) in vacuum.
248
Lens formula is:
Answer: Lens formula: 1/f = 1/v + 1/u.
Answer: Resonance occurs when driving frequency matches natural frequency.
Answer: P = 1/f = 1/0.25 = 4 diopters.
Answer: Concave mirrors form both real and virtual images.
Answer: Myopia is corrected with a concave diverging lens.
Answer: Convex lens forms virtual enlarged image between F and the lens.
Answer: Loudness is determined by the amplitude of the sound wave.
Answer: Speed of sound increases with temperature as molecules move faster.
Answer: Pitch is determined by the frequency of the sound wave.
Answer: Critical angle = sin-1(1/1.5) = 41.8 degrees.
Answer: Sound must travel 34 m round trip at 340 m/s in 0.1 s, so 17 m.
Answer: Diffraction is the bending and spreading of waves around obstacles.
Answer: Rainbows form from refraction, dispersion, and internal reflection in water droplets.