Question 1 :
1 kilowatt-hour is the amount of .... by 1000 watt electric appliance when it operates for one hour.

Question 4 :
A force $\displaystyle \left( 3\hat { i } +4\hat { j } \right) $ newton acts on a body and displaced it by $\displaystyle \left( 3\hat { i } +4\hat { j } \right) $ metre. The work done by the force is : <br>

Question 5 :
Is it possible that no transfer of energy may take place even when a force is applied to a body?

Question 6 :
If the momentum of a body is increased by 100%, then the percentage increase in the kinetic energy is

Question 7 :
A man $M_1$ of mass $80 \ kg$ runs up a staircase in $15\ s$. Another man $M_2$ also of mass $80\ &#160;kg$ runs up the staircase in $20\ &#160;s$. The ratio of the power developed by them will be:

Question 8 :
Under the action of a constant force, a particle is experiencing a constant acceleration. The power is?

Question 9 :
A boy carrying a box on his head is walking on a level road from one place to another on a straight road is doing no work against gravity.<br/>

Question 10 :
If a force of one newton displaces a body through a distance of one meter in the direction of force, the work done is :<br/>

Question 11 :
Two identical beads of {tex} \mathrm { m } = 100 {/tex} gram are connected by an inextensible massless string can slide along the two arms {tex} \mathrm { AC } {/tex} and {tex} \mathrm { BC } {/tex} of a rigid smooth wire frame in a vertical plane. If the system is released from rest, the kinetic energy of the first particle when they have moved by a distance of {tex} 0.1 \mathrm { m } {/tex} is {tex} 8 \mathrm { x } \times 10 ^ { - 3 } \mathrm { J } {/tex}. Find the value of {tex} \mathrm { x } . \left( \mathrm { g } = 10 \mathrm { m } / \mathrm { s } ^ { 2 } \right) {/tex}<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee5b18420d95285473c13"><br>

Question 12 :
A force of 2 x $10^4$ is applied to the larger piston of a hydraulic machine of $900cm^2$ in area. Neglecting friction, calculate the force exerted on the smaller piston of area $10cm^2$ to accomplish this task.

Question 13 :
A $3.0 N$ force applied on a $0.40 kg$ mass makes the mass move at a constant speed of $3.0 {m}/{s}$, held back by friction.<br/>In the span of it moving through $4.0 m$, the net work done on the mass is:

Question 14 :
A force of 5 N acts on a 15 kg particle initially at rest . What will be instantaneous power due to the force at the end of $6^{th}$ second.

Question 15 :
A ball is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

Question 16 :
A force applied by an engine of a train of mass $ 2.05 \times 10^6 \quad kg $ changes it velocity from $ 5 m /s $ to $ 25 m/s $ in $ 5$ minutes . the power of engine is

Question 17 :
A variable force {tex} P {/tex} is maintained tangent to a frictionless cylindrical surffaine of radius {tex} a {/tex} as shown in figure. By slowed and the spring towhich block of weight {tex} W {/tex} is moved and the spring towhich it is stretched from position 1 to position 2 . The work done by the force {tex} P {/tex} is<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee748dc973f528b538ced"><br>

Question 18 :
An ice cream has a marked value of $ 700 kcal $. How many kilowatt hour of energy will it deliver to the body as it is digested

Question 19 :
The velocity $'v'$ reached by a car of mass $'m'$ at certain distance from the starting point driven with constant power $'P'$ is such that:

Question 20 :
A body falls freely under gravity. Its velocity is {tex} v {/tex} when it has lost potential energy equal to {tex}\mathrm U {/tex}. What is the mass of the body?

Question 21 :
A body is initially at rest. It undergoes a one-dimensional motion with constant acceleration. The power delivered to it at time $t$ is proportional to <br/>

Question 22 :
Assertion: kilowatt hour is the unit of electric power. Reason: KWH is a commercial unit used for expressing consumed electrical energy.

Question 23 :
The work done in moving an object from origin to a point whose position vector is $\overline{r}=3\hat{i}+2\hat{j}-5\hat{k}$; by a force $\overline{F}=2\hat{i}-\hat{j}-\hat{k}$ is :<br/>

Question 24 :
A particle moves from a point $(-2\hat {i}+5\hat {j})$ to $(4\hat {j}+3\hat {k})$ when a force of $(4\hat {i}+3\hat {j})N$ applied. How much work has been done by the force?

Question 25 :
The pump of a water pumping system uses $2.0\ kW$ of electrical power when raising water. The<br>pumping system lifts $16kg$ of water per second through a vertical height of $7.0\ m$.<br>What is the efficiency of the pumping system?

Question 26 :
A body moves a distance of {tex} 10 \mathrm { m } {/tex} along a straight line under the action of a force of {tex}5{/tex} newtons. If the work done is {tex}25{/tex} joules, the angle which the force makes with the direction of motion of body is

Question 27 :
If the momentum of a body is increased by <b>50%</b> then the percentage increase in its kinetic energy is

Question 28 :
A particle is taken round a circle by application of force. The work done by the force is

Question 29 :
A force {tex} F = - K ( y \hat { i } + x \hat { j } ) {/tex} (where {tex} K {/tex} is a positive constant) acts on a particle moving in the {tex} x y {/tex} plane. Starting from the origin, the particle is taken along the positive {tex} x {/tex} axis to the point {tex} ( a , 0 ) , {/tex} and then parallel to the {tex} y {/tex} axis to the point {tex} ( a , a ) , {/tex} The total work done by the force {tex} F {/tex} on the particle is

Question 30 :
Two blocks of masses {tex} m _ { 1 } = 10 \mathrm { kg } {/tex} and {tex} m _ { 2 } = 20 \mathrm { kg } {/tex} are connected by a spring of stiffness {tex} k = 200 \mathrm { N } / \mathrm { s } {/tex} {tex} \mathrm { m } {/tex}. The coefficient of friction between the blocks and the fixed horizontal surface is {tex} \mu = 0.1 . {/tex} Find the minimum constant horizontal force {tex} F {/tex} (in newtons) to be applied to {tex} \mathrm { m } _ { 1 } {/tex} in order to slide the mass {tex} m _ { 2 } . {/tex} <br> [Take {tex} \mathrm {g= 10 m/s ^2}{/tex}

Question 31 :
A particle moves under the effect of a force {tex} \mathrm { F } = \mathrm { cx } {/tex} from {tex} \mathrm { x } = 0 {/tex} to {tex} \mathrm { x } = \mathrm { x } _ { 1 } , {/tex} the work done in the process is

Question 32 :
A mass of {tex} 20 \mathrm { kg } {/tex} moving with a speed of {tex} 10 \mathrm { m } / \mathrm { s } {/tex} collides with another stationary mass of {tex} 5 \mathrm { kg } {/tex}. As a result of the collision, the two masses stick together. The kinetic energy of the composite mass will be

Question 33 :
A block of mass {tex} 1 \mathrm { kg } {/tex} is pulled along the curve path {tex} \mathrm {A C B }{/tex} by a tangential force as shown in figure. The work done by the frictional force when the block moves from {tex} \mathrm A {/tex} to {tex}\mathrm B {/tex} is<br><img style='object-fit:contain' src="https://storage.googleapis.com/teachmint/question_assets/NEET/5e0ee6688420d95285473c80"><br>

Question 34 :
A spherical ball of mass {tex} 20 \mathrm { kg } {/tex} is stationary at the top of a hill of height {tex} 100 \mathrm { m } {/tex}. It rolls down a smooth surface to the ground, then climbs up another hill of height {tex} 30 \mathrm { m } {/tex} and finally rolls down to a horizontal base at a height of {tex} 20 \mathrm { m } {/tex} above the ground. The velocity attained by the ball is

Question 35 :
A ball moving with velocity {tex} 2 \mathrm { m } / \mathrm { s } {/tex} collides head on with another stationary ball of double the mass. If the coefficient of restitution is {tex} 0.5{/tex} ,then their velocities (in {tex} \mathrm { m } / \mathrm { s } ) {/tex} after collision will be

Question 36 :
A body is moved along a straight line by a machine delivering constant power. The distance moved by the body in time t is proportional to

Question 37 :
If W represents the work done, then match the two columns:<br><table> <tr><th>Column I </th> <th>Column II</th> </tr> <tr><td>(A)Force is always along the velocity</td> <td>(1)W=0</td> </tr> <tr><td>(B)Force is always perpendicular to velocity </td> <td>(2)W<0</td> </tr> <tr><td>(C)Force is always perpendicular to acceleration</td> <td>(3)W>0</td> </tr> <tr><td>(D)The object is stationary but the point of application of the force moves on the object</td> <td></td> </tr> </table>

Question 38 :
Calculate the work done on the tool by {tex} \vec { F } {/tex} if this displacement is along the straight line {tex} y = x {/tex} that connects these two points.

Question 39 :
When after collision the deformation is not relived and the two bodies move together after the collision, it is called

Question 40 :
A man of weight $50\&#160; kg$ carries an object&#160;to a height of $20\ m$ in a time of $10\&#160; s$. The power used by the man in the this&#160;process is $2000\ W$, then find the mass of the object carried by the man.<br/>[assume&#160;$g= 10 ms^{-2}]$