Verified Solution • 2025–26 Session moderate

QNEET-2022-Ph-558: NEET 2022 Physics - Class 11 NEET-2022-Ph-558 Solution: The terminal velocity of a copper ball of radius 5 mm falling…

The terminal velocity of a copper ball of radius 5 mm falling through a tank of oil at room temperature is 10 cm s−110\ \text{cm s}^{-1}. If the viscosity of oil at room temperature is 0.9 kg m−1 s−10.9\ \text{kg m}^{-1}\ \text{s}^{-1} the viscous drag force is: 4.23×10−6 N4.23 \times 10^{-6}\ \text{N} 8.48×10−3 N8.48 \times 10^{-3}\ \text{N} 8.48×10−5 N8.48 \times 10^{-5}\ \text{N} 4.23×10−3 N4.23 \times 10^{-3}\ \text{N}

Multiple Choice Options

  • A 4.23 ×\times _ 10 −- _ 6 N
  • B 8.48 ×\times _ 10 −- _ 3 N
  • C 8.48 ×\times _ 10 −- _ 5 N
  • D 4.23 ×\times _ 10 −- _ 3 N

Step-by-Step Verified Solution

F viscous = _ 6 � _ av F viscous = 6 _ 3.14 _ 0.9 _ 5 _ 10 _ 3 _ 10 _ 10 _ 2 = 84.78 _ 10 _ 4 = 8.478 _ 10 _ 3 N

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