NEET Physics MCQs

A particle moves along a semicircular path of radius $R$ in time $T$. If it returns to its starting point along the diameter in time $T/2$, what is the magnitude of the average velocity for the entire journey?

A body moves in a straight line for time $t_1$ with velocity $v_1$ and for time $t_2$ with velocity $v_2$ in the same direction. If the average velocity is equal to $(2v_1v_2)/(v_1+v_2)$, then the condition relating $t_1$ and $t_2$ is:

A particle moves along a closed trajectory. Which of the following is always true?

A particle moves along a spiral path given by $r = at$, $heta = bt$, where $a$ and $b$ are constants and $t$ is time. What is the magnitude of average velocity from $t=0$ to $t=T$?

A particle moves along a semicircular path of radius 5 m in 10 seconds. What is the magnitude of its average velocity?

An object moves with a velocity of 5 m/s for 10 seconds and then with a velocity of -5 m/s for another 10 seconds. What is its average velocity over the entire 20 seconds?

An object travels 20 meters in the first 2 seconds, and then 40 meters in the next 4 seconds. What is its average velocity?

A toy car with charge $q$ moves on a frictionless horizontal plane under a uniform electric field $\overrightarrow{E}$. Its velocity increases from 0 to $6 \, m/s$ in one second due to the force $q\overrightarrow{E}$. If the field's direction is reversed at that instant, and the car continues for two more seconds, what are its average velocity and average speed over the three seconds?

An electron with charge $-1.6 imes 10^{-19} \, C$ in a vacuum tube is subjected to a uniform electric field. It accelerates from rest to $2 imes 10^6 \, m/s$ in $0.5 \, \mu s$. The field is then reversed, and the electron continues to move for another $0.5 \, \mu s$. Calculate its average velocity and average speed over the entire duration.

A charged particle in a uniform electric field accelerates from $2 \, m/s$ to $8 \, m/s$ over $3 \, s$. The field direction then reverses. If the particle returns to its initial velocity after another $3 \, s$, what are the average velocity and speed over the $6 \, s$ period?