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Physics NEET Questions — Free MCQ Practice

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A geostationary satellite orbits around the earth in a circular orbit of radus 3600 km the time period of a satellite orbiting a few hundred kilometers above the earthâ€™s surface (Rearth = 6400 km) will approximately be = â€¦â€¦â€¦...h

A. 1/2 B. 1 C. 2 D. 4

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Explanation

$ {T_2 \over T_1 } = \left( {r_1 \over r_2} \right ) ^ {3/2} \Rightarrow T_2 = 24 \left( {6400 \over 3600} \right)^{3/2} = 2hours $

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A branch of physics dealing with motion without considering its causes is known as ....

A. Kinematicas B. dynamics C. Hydrodynemics D. mechanics

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Explanation

The branch of physics dealing with motion without considering its causes is known as kinematics. Kinematics focuses on describing how objects move, using concepts such as displacement, velocity, and acceleration, without analyzing the forces or energies involved in causing the motion.

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To locate the position of the particle we need ...

A. a frame of referance B. direction of the particle C. size of the particle D. mass of the particle

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Explanation

To locate the position of a particle, we need a frame of reference. A frame of reference is a coordinate system that allows us to specify the position of a particle in space by giving its coordinates relative to some origin.

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Two pulley arrangements of figure given are identical. The mass of the rope is negligible. In fig (a), the mass m is lifted by attaching a mass 2m to the other end of the rope. In fig (b), m is lifted up by pulling the other end of the rope with a constant downward force F = 2mg. The acceleration of m in the two cases are respectively

A.

3g, g

B.

g/3, g

C.

g, g/3

D.

g/3, 2g

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Explanation

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A car goes from one end to the other end of a semicircular path of diameter â€˜dâ€™.
Find the ratio between path legth and displacement.

A. $ 3 \pi / 2 $ B. $ \pi $ C. 2 D. $ \pi / 2 $

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Explanation

The path length of a car moving along a semicircular path of diameter 'd' is equal to half the circumference of a circle, which is $\pi d / 2$. The displacement is the straight line distance between the start and end points, which is 'd'. Therefore, the ratio between the path length and displacement is $(\pi d / 2) / d = \pi / 2$.

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The ratio of pathlength and the respective time interval is

A. Mean Velocity B. M ean speed C. instantaneous velocity D. instantaneous speed

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Explanation

The ratio of path length to the respective time interval is called mean speed. Mean speed is defined as the total distance traveled divided by the total time taken.

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A car covers one third part of its straight path with speed $V_1$ and the rest with speed $V_2$. What is its average speed ?

A. $ { 3 v_1 v_2 \over 2v_1 + v_2 } $ B. $ { 2 v_1 v_2 \over 3v_1 + v_2 } $ C. $ { 3 v_1 v_2 \over v_1 + 2v_2 } $ D. $ { 3 v_1 v_2 \over 2v_1 + 2v_2 } $

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Rohit completes a semicircular path of radius R in 10 seconds. Calculate average speed and average velocity in $ms^{â€“1}$.

A. $ { 2 \pi R \over 10}, { 2R \over 10} $ B. $ { \pi R \over 10}, { R \over 10} $ C. $ { \pi R \over 10}, { 2R \over 10} $ D. $ { 2 \pi R \over 10}, { R \over 10} $

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Explanation

To calculate the average speed and average velocity for Rohit completing a semicircular path of radius R in 10 seconds, we start with the average speed. The average speed is the total distance traveled divided by the total time taken. For a semicircle, the distance is half the circumference of a full circle, which is $rac{1}{2} imes 2 ext{Ï€}R = ext{Ï€}R$. Therefore, the average speed is $$ ext{Average speed} = rac{ ext{Ï€}R}{10}.$$ For the average velocity, we consider the straight-line displacement from the start to the end of the semicircle, which is the diameter of the circle, or $2R$. Therefore, the average velocity is $$ ext{Average velocity} = rac{2R}{10}.$$ This matches the option 'o3'.

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A particle moves 4m in the south direction. Then it moves 3m in the west direction. The time taken by the particle is 2 second. What is the ratio between average speed and average velocity ?

A. 5/7 B. 7/5 C. 14/5 D. 5/14

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What does the speedometer measure kept in motorbike ?

A. Average Velocity B. Average speed C. instantaneous speed D. instantaneous Velocity

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Explanation

A speedometer measures the instantaneous speed of a vehicle. Instantaneous speed is the speed of an object at a particular moment in time. It does not measure average speed or velocity. Hence, the correct option is o3: instantaneous speed.

Physics MCQs for NEET — Practice Questions with Answers

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