Physics MDCAT MCQs
Mechanics, electricity & modern physics MCQs
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Answer: A concave lens is a diverging lens and has negative power.
Answer: C = ε₀A/d. If d is doubled, C becomes half.
Answer: F = ma, so dimension of force = [M][LT⁻²] = [MLT⁻²]
Answer: During phase change (melting), the temperature remains constant at the melting point.
Answer: Doubling back halves the length and doubles the cross-section → R becomes R/4 = 10/4 = 2.5 Ω
Answer: Impulse = Force × time = N·s, and from momentum change it is also kg·m/s. Both are equivalent.
Answer: Normal incidence means the ray is perpendicular to the surface, so angle of incidence = 0°
Answer: KE = ½mv² = ½ × 1 × 9 = 4.5 J
Answer: Light travels fastest in vacuum (c = 3 × 10⁸ m/s), which is the universal speed limit.
Answer: Pitch = distance moved per rotation = 1 mm (given), least count = 1/50 = 0.02 mm
Answer: Weight on Moon = W/6 ≈ 49/6 ≈ 8.17 N ≈ 8.2 N
Answer: By conservation of momentum: mv - mv = 2mv\' → v\' = 0
Answer: Buoyant force = weight in air - apparent weight = 20 - 16 = 4 N
Answer: Escape velocity = √(2gR) ≈ 11.2 km/s
Answer: h = ½gt² → 80 = ½ × 10 × t² → t² = 16 → t = 4 s
Answer: Displacement has both magnitude and direction, making it a vector quantity.
Answer: The orbital velocity near Earth\'s surface is v = √(gR) ≈ 7.9 km/s
158
If the length of a wire is doubled and its cross-sectional area is halved, the resistance becomes:
Answer: R = ρL/A. If L→2L and A→A/2, new R = ρ(2L)/(A/2) = 4ρL/A = 4R
Answer: A single movable pulley provides a mechanical advantage of 2
Answer: Water boils at 100°C (373 K) at standard atmospheric pressure.