Concept of energy - class-X
Description: concept of energy | |
Number of Questions: 47 | |
Created by: Neema Pandya | |
Tags: simple machines physics energy : forms and sources work, energy and machines the essence of change work and energy primary concept of force and energy energy transformations and energy transfers energy and its forms |
The work done by the external forces on a system equals the change in:
Find the change in internal energy in joulewhen 10$\mathrm { g }$ of air is heated from $30 ^ { \circ } \mathrm { C }$ to $40 ^ { \circ } \mathrm { C }$$( \mathrm { c } = 0.172 \mathrm { kcal } / \mathrm { kg } / \mathrm { KJ } = 4200 \mathrm { J } / \mathrm { kcal } )$
The energy generated in stars is because of
What will be the potential energy of a body of mass 5 kg kept at a height of 10 m ?
Define one kilo-calorie of heat.
What physical quantity does the electron volt(eV) measure?
The SI unit of energy is:
When heated, molecules absorb ____ and their capacity to do ____ increases.
1 kilowatt hour $=$ ___________ .
The capacity of a body to do work is called ______ .
A body at rest have-
kg $m^2S^{-2}$ represents the unit of :
A body at rest can have:
A man carries a heavy box on his head on a horizontal plane form one place to another. In this he does
The capacity to do work is called :
What is the value of 1 calorie in joules?
The CGS unit of energy is :
$1eV=$
Which physical quantity is measured in $calorie$?
$1J=$
Erg is a unit for :
The capacity to do work is called:
$1calorie=$
$1kWh=$
The amount of work done (or, energy spent) by a source of power $1kW$ in $1h$ time is:
An object of mass $40\ kg$ is raised to a height of $5\ m$ above ground. If the object is allowed to fall down find its kinetic energy when it is half-way down.
A certain household has consumed $250$ units of energy during a month. How much energy is this in joules?
Which of the following is NOT a measure of energy?
Identify the best definition of energy?
Energy equivalent of 4.2 mg in kilo calories is
Lenzs law is a consequence of the law of conservation of:
Which one of the following is not the unit of energy?
Electric motor converts electrical energy into
A fish swimming in water possess mechanical energy.
A particle of mass $m$ is moving in a horizontal circle of radius $r$ with a centripetal force $\vec {F}=\dfrac{-k}{r^{2}}\hat {r}$. The total mechanical energy of the particle is
Which does not have the same unit as others
It requires twenty turns of the stem of a watch to wind the main spring and this stores sufficient energy to keep the watch running for 30.0 hour.If ten turns are given to the stem, it will run for:
Which one of the following units measures energy?
How much work will be done in bringing a charge of $10$ milli coulombs from infinity to a point at which potential is $12v$.
Erg is a unit of:
When a body does some work its energy decreases.
Energy is the capacity to do work.
SI unit of energy is _________ .
If the values of force and length are increased four times then the unit of energy will increases by?
When a men walks on a horizontal surface then work done by
Energy can be defined as:
Flowing water has the capacity to do work