List of top Physics Questions on work, energy and power asked in JEE Main

A player caught a cricket ball of mass 150 g moving at a speed of 20 m/s. If the catching process is completed in 0.1 s, the magnitude of force exerted by the ball on the hand of the player is:

A block is simply released from the top of an inclined plane as shown in the figure above. The maximum compression in the spring when the block hits the spring is :

A body of mass 50 kg is lifted to a height of 20 m from the ground in the two different ways as shown in the figures. The ratio of work done against the gravity in both the respective cases, will be:

A spherical body of mass $2\, kg$ starting from rest acquires a kinetic energy of $10000\, J$ at the end of $5^{\text {th }}$ second The force acted on the body is ___$N$

In the circuit shown in the figure, the ratio of the quality factor and the band width is__s

A particle of mass 10 g moves in a straight line with retardation 2x, where x is the displacement in SI units. Its loss of kinetic energy for above displacement is \((10/x)^{-n}\)J. The value of n will be ____________

Vectors $a \hat{i}+b \hat{j}+\hat{k}$ and $2 \hat{i}-3 \hat{j}+4 \hat{k}$ are perpendicular to each other when $3 a+2 b=7$, the ratio of $a$ to $b$ is $\frac{x}{2}$ The value of $x$ is __

Identify the correct statements from the following:
A. Work done by a man in lifting a bucket out of a well by means of a rope tied to the bucket is negative.
B. Work done by gravitational force in lifting a bucket out of a well by a rope tied to the bucket is negative.  
C. Work done by friction on a body sliding down an inclined plane is positive.  
D. Work done by an applied force on a body moving on a rough horizontal plane with uniform velocity in zero.  
E. Work done by the air resistance on an oscillating pendulum in negative.  
Choose the correct answer from the options given below:

Force acting on a particle moving along the x - axis is given by F = (2 + 3x)i. The work done by this force from x = 0 to x = 4 m is

A stone of mass $1 \, kg$ is tied to end of a massless string of length $1 m$ If the breaking tension of the string is $400\, N$, then maximum linear velocity, the stone can have without breaking the string, while rotating in horizontal plane, is :

A body of mass $05\, kg$ travels on straight line path with velocity $v=\left(3 x^2+4\right) m / s$ The net workdone by the force during its displacement from $x =0$ to $x =2 \,m$ is :

Heat is given to an ideal gas in an isothermal process
A Internal energy of the gas will decrease
B Internal energy of the gas will increase
C Internal energy of the gas will not change
D The gas will do positive work E The gas will do negative work
Choose the correct answer from the options given below:

A bag of sand of mass $98\, kg$ is suspended by a rope A bullet of $200\, g$ travelling with speed $10\, ms ^{-1}$ gets embedded in it, then loss of kinetic energy will be

Two bodies having the same linear momentum have a ratio of kinetic energy as 16:9. Find the ratio of masses of these bodies.

A variable force \(F=5x\) \(N\) acts on a body moving along x-axis. Find the work done by this force in displacing the body from \(x=2\) m to \(x=4\) m.
(K is constant)

A body of mass $1 \,kg$ begins to move under the action of a time dependent force $\vec{F}=\left(\hat{i}+3 t^2 \hat{j}\right) N$, where $\hat{i}$ and $\hat{j}$ are the unit vectors along $x$ and $y$ axis The power developed by above force, at the time $t=2 s\,$, will be _________W

The variation of stopping potential (V0) as a function of the frequency (v) of the incident light for a metal is shown in figure. The work function of the surface is

In the given figure, an inductor and a resistor are connected in series with a battery of emf E volt. \(\frac{E^a}{2b}\) j/s represents the maximum rate at which the energy is stored in the magnetic field (inductor). The numerical value of \(\frac{b}{a}\) will be ______.

A body of mass $1 kg$ collides head on elastically with a stationary body of mass $3 kg$ After collision, the smaller body reverses its direction of motion and moves with a speed of $2 m / s$ The initial speed of the smaller body before collision is ___ $ms ^{-1}$

A ball is dropped from a height of $20 m$ If the coefficient of restitution for the collision between ball and floor is $0.5$, after hitting the floor, the ball rebounds to a height of ___$m$

A small particle moves to position $5 \hat{i}-2 \hat{j}+\hat{k}$ from its initial position $2 \hat{i}+3 \hat{j}-4 \hat{k}$ under the action of force $5 \hat{i}+2 \hat{j}+7 \hat{k} N$. The value of work done will be ________$J$

A common example of alpha decay is

Given below are two statements:  
Statement I : The diamagnetic property depends on temperature.  
Statement II : The included magnetic dipole moment in a diamagnetic sample is always opposite to the magnetizing field.  
In the light of given statement, choose the correct answer from the options given below:  

An engine operating between the boiling and freezing points of water will have  
1. efficiency more than 27%  
2. efficiency less than the efficiency a Carnot engine operating between the same two temperatures.  
3. efficiency equal to 27%  
4. efficiency less than 27%  

The amplitude of 15sin(1000πt) is modulated by 10sin(4πt) signal. The amplitude modulated signal contains frequency (ies) of
(A) 500 Hz  
(B) 2 Hz  
(C) 250 Hz  
(D) 498 Hz  (E) 502 Hz 
Choose the correct answer from the options given below: