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What is the unit of Power
ML^2T^-3 is the dimension of:
Coal and petrol are stores of chemical energy when are burnt, chemical energy is converted into heat energy i.e chemical energy = heat energy + ______.
NTS 2015 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:
When a 7000 N elevator moves from street level to the top of a building 300 m above the street level, what is the change in gravitational potential energy?
NTS 2016 DUHS & JSMU
Physics
Work, Power and Energy
Elimination Tool:
A 1.75 m tall weight-lifter raises a weight of mass 50 kg to a height of 0.5 m above its head. How much work is being done by it? (g = 10 ms-2)
PMC 2020
Physics
Work, Power and Energy
Elimination Tool:
A gas is enclosed in a container fitted with a piston of cross-sectional area of 0.10 m2. The pressure of the gas is maintained at 8000 N/m2. When heat is slowly transferred, the piston is pushed up through a distance of 4.0 cm. If 42 J heat is transferred to the system during the expansion, what is the change in the internal energy of the system?
NTS 2015 DUHS and JSMU
Physics
Work, Power and Energy
Elimination Tool:
The K.E. of a body of mass 2kg and momentum of 2N is:
PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:
From the given options, which one lists the amount of work done from smallest to Largest displacement is In forward direction?
Which of the following is a unit of Work?
The food we eat in one day has about the same energy as:
NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:
The escape velocity of a body from the earth is Ve If the radius of the earth contracts to 1/4th its value, keeping the mass of the earth constant, the escape velocity will be
An automobile is moving forwards with uniform velocity due to the force exerted by its engine. If the force is doubled with the velocity remaining constant what happens to its total power?
UHS 2019
Physics
Work, Power and Energy
Elimination Tool:
An object of mass 2kg has a velocity of 6m/s. After 8 seconds, its velocity increases to 10 m/s.
Calculate the power of the object
Work done by retarding force is:
Which of the following statement shows that no work is done?
UHS 2019
Physics
Work, Power and Energy
Elimination Tool:
Dimensions of U are
What Is the power of a body if 1 N force is acted upon a body have a constant velocity of 10ms-1?
Escape velocity of moon is
A bullet fired from gun can pierce a target due to
PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:
A ball is released from a height h, above a table. Given that air resistance is negligible and 50% of its kinetic energy is converted to other forms of energy at each bounce, what will be the height reached after the second bounce?
If a force of 1 N acts on a body through a distance of 1 m in the direction of force, how much
work is done?
When an object is thrown upward, it rises to height h. How high is the object in terms of h, when it has lost ⅓ of its original kinetic energy?:
NTS 2019
Physics
Work, Power and Energy
Elimination Tool:
A body of mass m moving with velocity v has a kinetic energy. If its velocity is increased 25%. what will be the new K.E?
In which of the following case(s) the work done be positive?
Calculate the final kinetic energy when a shop keeper pushes a fruit crate, initially at rest, towards another shopkeeper by exerting a constant horizontal force F of magnitude 5N through a distance of 1 meter.
NTS 2015 DUHS and JSMU
Physics
Work, Power and Energy
Elimination Tool:
The basic source of geothermal energy is
Kilowatt-hour is a unit of?
NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:
A 60 kg boy runs up a hill through a height of 6 m in 3 seconds. How much work does he do against gravitational force?
NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:
If the mass and radius of Earth arc reduced to one fourth, the escape velocity will.
Which of the following field is dependent on the path?
Escape velocity of Neptune is:
Identify the examples of kinetic energy
A moving ball can break a glass window
A striking hammer can drive a nail
A stone thrown upward can lift itself against the force of gravity
NTS 2015 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:
An object whose mass is 100 g starts from rest and moves with constant acceleration of 20 cm/s2. At the end of 8s its momentum in g cm / s is:
NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:
Mechanical energy of an object is the sum of its Potential Energy and ?
A particle having mass m and momentum p, the kinetic energy of the particle is given by:
PMC Sample 3
Physics
Work, Power and Energy
Elimination Tool:
A force of 10 N is acting on an object at angle of 120 degree through the distance of 4 m. Calculate the work done.
- a) – 20 j b) 20 /
Two bodies X of mass 4kg and Y of mass 6 kg have same linear momentum. If the kinetic energy of Y is 48 J then kinetic energy of body X is:
A neutron travels a distance of 12 m in a time interval of 3.6 x 10 – 4s. Assuming its speed was constant, find its kinetic energy. (take 1.7 x 10 – 27 kg is the mass of neutron)
NTS 2015 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:
Work will be maximum when the angle between force and displacement is:
When the speed of your car is halved, by what factor does its kinetic energy decreases?
PMC 2020
Physics
Work, Power and Energy
Elimination Tool:
The rate at which work is being done is called:
UHS 2018
Physics
Work, Power and Energy
Elimination Tool:
Which one of them is not conservative force?
Minimum velocity needed to put the satellite into orbit is
A body of mass m moving with velocity v has a kinetic energy K. If its velocity is increased by 25%, what will be the work done in terms of K.E?
The potential energy of a particle having a mass of 0.5 kg, moving along the x axis, is given by U= 2*x(x-3), where x = the distance moved by the particle. The speed of the particle will be maximum when it has moved a distance of:
PMC Sample 2
Physics
Work, Power and Energy
Elimination Tool:
Value of solar constant on the surface of Earth is:
A/An _____ is that in which the momentum of the system as well as the kinetic energy of the system before and after the collision is conserved i.e. remains the same.
NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:
A neutron travels a distance of 24 m in a time interval of 3.6 x 10^-4 s. Assuming its speed was constant. Find its kinetic energy. Take 1.7 x 10^-27 kg as the mass of the neutron.
NTS 2016 SMBBMC
Physics
Work, Power and Energy
Elimination Tool:
Escape velocity of Jupiter is:
What is the speed of 2.0 kg metallic bob at the mean position of a simple pendulum, when released from its extreme position 0.5m high? (g = 10 ms-2)
PMC 2020
Physics
Work, Power and Energy
Elimination Tool:
Work done by friction force is always:
PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:
If the speed of an object is doubled, its Kinetic Energy will
When we lift an object, we do work against which of the following:
1) Friction 2) Gravity
Which is the unit of energy
PMC Sample 3
Physics
Work, Power and Energy
Elimination Tool:
A mass of 20 kg is lifted from the floor to a height of 2m in 4.9 sec. Calculate the power in Watts.
NUMS 2019 Reconduct
Physics
Work, Power and Energy
Elimination Tool:
The sum of Kinetic energy and the Potential energy is always constant to provide _____ .
NTS 2019
Physics
Work, Power and Energy
Elimination Tool:
Energy consumed by 60 watt bulb in 2 minutes is equal to:
UHS 2018
Physics
Work, Power and Energy
Elimination Tool:
All the food that you eat in one day has about the same energy as — Liter of Petrol
1 kilowatt hour =
NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:
Which of the following is a conservative field?
In case of harmonic oscillator total energy remains
PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:
A 70 kg sportsman runs up a long flight of stairs in 4 seconds. The vertical height of the stairs is 4.5 m. What will be his power output in watts?
NTS 2015 DUHS and JSMU
Physics
Work, Power and Energy
Elimination Tool:
What will be the speed a electron having an energy of 18.2 x10^14 Joule?
Which unit expresses work per unit charge?
NTS 2017
Physics
Work, Power and Energy
Elimination Tool:
Two identical bodies have a velocity ratio 2 : 3. What is the ratio of kinetic energies?
NUMS 2020
Physics
Work, Power and Energy
Elimination Tool:
The force constant k1 and k2 of two springs are in a ratio of 5 : 4. They are stretched by the same length, if the potential energy stored in one spring is 25 J then the potential energy stored in the second spring is:
PMC Sample 1
Physics
Work, Power and Energy
Elimination Tool:
The sum of all forms of molecular energies (Kinetic and Potential) of a substance is termed as?
UHS 2019
Physics
Work, Power and Energy
Elimination Tool:
Joules
When the output power equals to one-half of the input power, efficiency of the transformer becomes:
NUMS 2015
Physics
Work, Power and Energy
Elimination Tool:
One kilowatt – hour is equivalent to a factor ____ in Joules.
NTS 2016 DUHS & JSMU
Physics
Work, Power and Energy
Elimination Tool: