NEET UG Physics — Mechanics previous year questions with solutions.
The work done to raise a mass $m$ from the surface of the earth to a height $h$, which is equal to the radius of the earth is:
A disc of radius $2 m$ and mass $100 kg$ rolls on a horizontal floor. Its centre of mass has speed of $20 cm{s}^{-1}.$ How much work is needed to stop it?
The unit of thermal conductivity is
An object flying in air with velocity $(20 \hat{i}+25 \hat{j}-12 \hat{k})$ suddenly breaks in two pieces whose masses are in the ratio $1: 5$. The smaller mass flies off with a velocity $(100 \hat{i}+35 \hat{j}+8 \hat{k})$. The velocity of the larger piece will be
Body $A$ of mass $4m$ moving with speed $u$ collides with another body $B$ of mass $2m$ at rest. The collision is head on and elastic in nature. After the collision, the fraction of energy lost by the colliding body $A$ is
A solid cylinder of mass $2 \mathrm{~kg}$ and radius $50 \mathrm{~cm}$ rolls up an inclined plane of angle inclination $30^{\circ}$. The centre of mass of cylinder has speed of $4 \mathrm{~m} / \mathrm{s}$. The distance travelled by the cylinder on the inclined surface will be : (Take $g=10 \mathrm{~m} / \mathrm{s}^2$ )
A soap bubble having radius of $1 mm$ is blown from a detergent solution having a surface tension of $2.5\times {10}^{-2} N{m}^{-1}.$ The pressure inside the bubble equals at a point ${Z}_{0}$ below the free surface of water in a container. Taking $g=10 m{s}^{-2},$ density of water $={10}^{3} kg{m}^{-3},$ the value of ${Z}_{0}$ is
A solid cylinder of mass $2 kg$ and radius $4 cm$ is rotating about its axis at the rate of $3\mathrm{rpm}$. The torque required to stop after $2\pi$ revolutions is
Assuming that the gravitational potential energy of an object at infinity is zero, the change in potential energy (final - initial) of an object of mass $m$, when taken to a height $\mathrm{h}$ from the surface of earth (of radius $\mathrm{R}$ ) is given by,
A mass $m$ is attached to a thin wire and whirled in a vertical circle. The wire is most likely to break, when
A body weighs $200 N$ on the surface of the earth. How much will it weigh half way down to the centre of the earth?
When an object is shot from the bottom of a long smooth inclined plane kept at an angle $60^{\circ}$ with horizontal, it can travel a distance ${x}_{1}$ along the plane. But, when the inclination is decreased to $30^{\circ}$ and the same object is shot with the same velocity, it can travel ${x}_{2}$ distance. Then ${x}_{1}:{x}_{2}$ will be
A solid sphere is rotating freely about its symmetric axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?
Three objects, $A$: (a solid sphere), $B$: (a thin circular disk) and $C$: (a circular ring), each have the same mass $M$ and radius $R$. They all spin with the same angular speed $\omega$ about their own symmetric axes. The amounts of work $(W)$ required to bring them to rest, would satisfy the relation
The moment of the force, $\vec{F}=4\hat{i}+5\hat{j}-6\hat{k}$ at $( 2,0,-3 ),$ about the point $( 2,-2,-2 ),$ is given by
A block of mass m is placed on a smooth inclined wedge $ABC$ of inclination $\theta$ as shown in the figure. The wedge is given an acceleration $a$ towards the right. The relation between $a$ and $\theta$ for the block to remain stationary on the wedge is 
A body initially at rest and sliding along a frictionless track from a height $h$ (as shown in the figure) just completes a vertical circle of diameter $AB=D$. The height $h$ is equal to, 
The kinetic energies of a planet in an elliptical orbit about the Sun, at positions, $A, B$ and $C$ are ${K}_{A}, {K}_{B} and {K}_{C}$, respectively. $AC$ is the major axis and $SB$ is perpendicular to $AC$ at the position of the Sun $S$ as shows in the figure. Then 
A small sphere of radius $r$ falls from rest in a viscous liquid. As a result, heat is produced due to viscous force. The rate of production of heat when the sphere attains terminal velocity, is proportional to
Two wires are made of the same material and have the same volume. The first wire has cross-sectional area $A$ and the second wire has cross-sectional area $3A.$ If the length of the first wire is increased by $\Delta l$ on applying a force $F,$ how much force is needed to stretch the second wire by the same amount?
A moving block having mass $m,$ collides with another stationary block having mass $4m.$ The lighter block comes to rest after collision. When the initial velocity of the lighter block is $v,$ then the value of coefficient of restitution $(e)$ will be
If the mass of the Sun were ten times smaller and the universal gravitational constant were ten times larger in magnitude, which of the following is not correct?
A toy car with charge q moves on a frictionless horizontal plane surface under the influence of a uniform electric field $\vec{E}$. Due to the force $q\vec{E}$, its velocity increases from 0 to $6 m{s}^{-1}$ in one second duration. At that instant the direction of the field is reversed. The car continues to move for two more seconds under the influence of this field. The average velocity and the average speed of the toy car between $0$ to $3$ seconds are respectively
A solid sphere is in rolling motion. In rolling motion a body possesses translational kinetic energy $({K}_{t})$ as well as rotational kinetic energy $({K}_{r})$ simultaneously. The ratio ${K}_{t}:({K}_{t}+{K}_{r})$ for the sphere is