JEE Main Physics: Work Energy Power Practice Questions

26 questions with answers and step-by-step solutions. Tap any question to see the full worked solution.

Q1.
$A force of 10 Newtons acts on a body and displaces it by 5 meters in the direction of the force. Calculate the work done in Joules.$
Easy
Q2.
$A body of mass 2 kg is moving with a velocity of 4 meters per second. What is its kinetic energy in Joules?$
Easy
Q3.
$An object of mass 5 kg is raised to a height of 10 meters above the ground. Calculate the potential energy gained by the object, taking acceleration due to grav$
Easy
Q4.
$A machine does 400 Joules of work in 20 seconds. What is the power of the machine in Watts?$
Easy
Q5.
$If the velocity of a body is doubled, its kinetic energy becomes how many times its original value?$
Easy
Q6.
$A p a r t i c l eo f ma ss 2 k g m o v es u n d er t h e in f l u e n ceo f a f or ce F = (3 t^{2} i + 4 t j) N . I f t h e p a r t i c l es t a r t s f r o m r es t a tt h eor i g in, w ha t i s t h e p o w er d e l i v er e d$
Medium
Q7.
$A block of mass 1 kg is pushed against a spring with spring constant 100 N/m, compressing it by 0.2 m. When released, the block slides on a rough horizontal sur$
Medium
Q8.
$A body of mass 2 kg is dropped from a height of 10 meters. Due to air resistance, it hits the ground with a speed of 12 m/s. What is the work done by air resist$
Medium
Q9.
$A force F = (2x + 3) N acts on a particle moving along the x-axis. What is the work done by this force as the particle moves from x = 0 to x = 2 meters?$
Medium
Q10.
$An engine pumps water continuously through a hose. Water leaves the hose with a velocity v and m is the mass per unit length of the water jet. What is the rate$
Medium
Q11.
$A p a r t i c l eo f ma ss mm o v es ina p o t e n t ia l f i e l d U (x) = a / x^{2} - b / x, w h er e aan d ba r e p os i t i v eco n s t an t s . W ha t i s t h e p er i o d o f s ma l l osc i l l a t i o n s ab o u tt h es t a$
Hard
Q12.
$A block of mass m is attached to a spring of constant k and is placed on a rough horizontal surface with coefficient of friction mu. If the block is released fr$
Hard
Q13.
$A chain of mass M and length L is held on a frictionless table with 1/n of its length hanging over the edge. If the chain is released, what is the velocity of t$
Hard
Q14.
$A p a r t i c l e m o v es a l o n g t h e x - a x i s u n d er t h e in f l u e n ceo f a f or ce F = - k * x + a l p ha * x^{3} . W ha t i s t h e p o t e n t ia l e n er g y f u n c t i o n U (x) i f U (0) = 0 ?$
Hard
Q15.
$A body of mass m is projected vertically upwards with velocity v. If it experiences a resistive force proportional to its velocity, F = -k * v, what is the maxi$
Hard
Q16.
$A body of mass 2 kg is dropped from a height of 10 meters. What is its kinetic energy just before it hits the ground?$
Medium
Q17.
$A force F = (3i + 4j) N acts on a body and displaces it by s = (2i + 3j) m. What is the work done by the force?$
Medium
Q18.
$A particle of mass 2 kg moves along the x-axis under the influence of a force given by F = 10 - 2x Newtons. If the particle starts from rest at x = 0, what is i$
Medium
Q19.
$An engine pumps water continuously through a hose. Water leaves the hose with a velocity of 2 m/sand the mass per unit length of the water jet is 0.1 kg/m. What$
Medium
Q20.
$A p a r t i c l e m o v es ina f or ce f i e l d F = (y^{2}) i + (2 x y) j . C a l c u l a t e t h e w or k d o n e inm o v in g t h e p a r t i c l e f r o m (0, 0) t o (1, 1) a l o n g t h e p a t h y = x^{2} .$
Hard
Q21.
$A chain of mass M and length L is held on a frictionless table with a fraction 1/n of its length hanging over the edge. If the chain is released, what is the ve$
Hard
Q22.
$A block of mass m is pushed against a spring of constant k by a distance x. When released, it slides up a rough incline of angle theta with coefficient of frict$
Hard
Q23.
$A block of mass m is attached to a spring of constant k on a smooth horizontal surface. The block is given an initial velocity v0. If the spring is also attache$
Hard
Q24.
$Which of the following is a unit of power?$
Easy
Q25.
$A crane lifts a load of 100 kg to a height of 10 meters in 20 seconds. What is the power developed by the crane in Watts? (Take g = 10 m/s squared)$
Easy
Q26.
$A spring with spring constant k = 100 N/m is compressed by 0.1 meters. What is the potential energy stored in the spring in Joules?$
Easy

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