1. CONCISE Physics - Middle School - 7
1. Physical Quantities and Measurement
4. Light energy
7. Electricity and Magnetism
1. Objective Questions
2. Short/Long Answer Questions
Q1) Define the term energy.
Q2) State the unit of energy and define it.
Q3) Name the different forms of energy .
Q4) What are the two kinds of mechanical energy ?
Q5) What is potential energy? State its unit.
Q6) Give one example of a body that has potential energy, in each of the following :
(i) due to its position, (ii) due to its state.
Q7) State two factors on which the potential energy of a body at a certain height above the ground depends.
Q8) Two bodies A and B of masses 10kg and 20kg respectively are at the same height above the ground. Which of the two has the greater potential energy?
Q9) A bucket full of water is on the first floor of your house and another identical bucket with the same quantity of water is kept on the second floor. Which of the two has greater potential energy?
Q10) Define the term kinetic energy. Give one example of a body which possesses kinetic energy.
Q11) State two factors on which the kinetic energy of a moving body depends.
Q12) Two toy-car A and B of masses 500g and 200g respectively are moving at the same speed. Which of the two has the greater kinetic energy?
Q13) A cyclist doubles his speed. How will his kinetic energy change: increases; decreases or remain same ?
Q14) Name the form of energy which a wound up watch spring possess.
Q15) Can a body possess energy even when it is not in motion? Explain your answer with an example .
Q16) Name the type of energy (kinetic or potential) possessed by the following :
(i) a moving cricket ball (ii) a stone at rest on the top of the building (iii) a compressed spring (iv) a moving bus (v) a bullet fired from a gun (vi) water flowing in a river (vii) a stretched rubber band
Q17) Give one example to show the conversion of potential energy to kinetic energy when put in use.
Q18) State the energy changes that occur in the following:
(i) the unwinding of a watch spring. (ii) burning coal while operating a steam engine. (iii) lighting of a torch bulb. (iv) an electric generator (or dynamo).
Q19) Energy can exist in several forms and may change from one form to another. Give two examples to show the conversion of energy from one form to another.
Q20) Give one relevant example for each of the following transformation of energy: (i) electrical energy to heat energy. (ii) electrical energy to mechanical energy. (iii) electrical energy to light energy. (iv) chemical energy to heat energy. (v) chemical energy to light energy.
Q22) Give one example to show that the sum of potential energy and kinetic energy remains constant if friction is ignored.
Q23) A ball is made to fall freely from a height. State the kind/ kinds of energy possessed by the ball when it is (a) at the highest point (b) just in the middle (c) at the ground
Q24) State the changes in form of energy while producing hydro electricity.
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CONCISE Physics - Middle School - 7
Physical Quantities and Measurement
Electricity and Magnetism
Short/Long Answer Questions
Race To Space
Terms & Policies