Physics
Fill in the blanks:
(a) An electric fan converts electrical energy into …………… energy.
(b) Cooking gas converts …………… energy into heat energy.
(c) Energy possessed by a compressed spring is …………… energy.
(d) The ability to do work is called …………… .
(e) The energy possessed by a body due to its position is called …………… energy.
(f) The energy possessed by a body due to its motion is called …………… energy.
(g) Green plants convert …………… energy into chemical energy.
(h) The S.I. unit of energy is …………… .
(i) An object falling freely from the roof of a multistorey building has …………… and …………… energy when halfway down the building.
Work, Energy & Power
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Answer
(a) An electric fan converts electrical energy into mechanical energy.
(b) Cooking gas converts chemical energy into heat energy.
(c) Energy possessed by a compressed spring is potential energy.
(d) The ability to do work is called energy .
(e) The energy possessed by a body due to its position is called potential energy.
(f) The energy possessed by a body due to its motion is called kinetic energy.
(g) Green plants convert light energy into chemical energy.
(h) The S.I. unit of energy is joule.
(i) An object falling freely from the roof of a multistorey building has potential energy and kinetic energy when halfway down the building.
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Related Questions
Assertion (A): Mechanical energy of a freely falling body increases as it falls.
Reason (R): Potential energy is converted into kinetic energy during free fall.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Assertion (A): A stretched bow has kinetic energy.
Reason (R): Stretching stores potential energy.
- Both A and R are true and R is the correct explanation of A
- Both A and R are true and R is not the correct explanation of A
- A is true but R is false
- A is false but R is true
Write true or false for each statement:
(a) A man going up has potential energy and kinetic energy both.
(b) A gum bottle lying on a table has no energy.
(c) In an automobile engine, chemical energy changes into mechanical energy.
(d) Potential energy changes into kinetic energy when it is put to use.
(e) One form of energy cannot be converted into another form.
(f) There is always some loss of energy in conversion from one form of energy to another form, so the total energy is not conserved.
(g) The energy of flowing water can be converted into electric energy (electricity).
Match the following:
Column A Column B (a) Running water (i) heat energy (b) Burning (ii) vibrations (c) Energy (iii) atom bomb (d) Sound energy (iv) kinetic energy (e) Nuclear energy (v) joule