Assertion : Falling raindrops acquire a terminal velocity. Reason… - Vidyadip

MCQ

$Assertion :$ Falling raindrops acquire a terminal velocity.
$Reason :$ A constant force in the direction of motion and a velocity dependent force opposite to the direction of motion, always result in the acquisition of terminal velocity.

A
If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.
B
If both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.
✓
If the Assertion is correct but Reason is incorrect.
D
If both the Assertion and Reason are incorrect.

✓

Answer

Correct option: C.

If the Assertion is correct but Reason is incorrect.

c
It is true that raindrops usually attain terminal velocity. During their motion, the drops experience a velocity dependent viscous force which act in opposite direction of velocity and it balances the weight of drop. Thus no net external force acts on the drop and the drops fall with constant velocity which is termed as terminal velocity.

Hence Assertion statement is correct but reason statement is incorrect.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 9.1 , fluid mechanics→9.1 , fluid mechanics — all question types→Physics STD 11 Science question papers→Rajasthan Board STD 11 Science question papers→Rajasthan Board question paper generator→

Similar questions

Two particles of masses $1\ kg$ and $3\ kg$ move towards each other under their mutual force of attraction. No other force acts on them. When the relative velocity of approach of the two particles is $2\ m/s,$ their centre of mass has a velocity of $0.5 \ m/s$. When the relative velocity of approach becomes $3\ m/s,$ the velocity of the centre of mass is ........ $m/s$.

Fundamental frequency of an open pipe of length $0.5 m$ is equal to the frequency of the first overtone of a closed pipe of length $l$. The value of $l_c$ is $(m)$

The weight of an aeroplane flying in the air is balanced by

Two particles of equal mass go around a circle of radius R under the action of their mutual gravitational attraction. The speed v of each particle is:

Suppose a player hits several baseballs. Which baseball will be in the air for the longest time?

A ball is released from certain height. It loses $50\%$ of its kinetic energy on striking the ground. It will attain a height again equal to

If the length of a cylinder is $l=(4.00 \pm 0.01) cm$, radius $r =(0.250 \pm 0.001) \;cm$ and mass $m =6.25 \pm 0.01\; g$. Calculate the percentage error in determination of density.

The molar specific heat at constant pressure of an ideal gas is $(7/2)R.$ The ratio of specific heat at constant pressure to that at constant volume is

The frequency of a sound wave is n and its velocity is v. If the frequency is increased to 4n, the velocity of the wave will be:

The ideal mechanical advantage of the combination of pulleys shown is