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10 questions · self-marked practice — reveal the answer and mark yourself.

Question 11 Mark
Fill in the following blanks with suitable word:
The sum of the potential and kinetic energies of a body is called ______ energy.
Answer
The sum of the potential and kinetic energies of a body is called mechanical energy.
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Question 21 Mark
Fill in the following blanks with suitable word: The electricity meter installed in our home measures electric energy in the units of _____.
Answer
The electricity meter installed in our home measures electric energy in the units of kWh.
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Question 31 Mark
Fill in the following blanks with suitable word: $1$ watt is a rate of working of one _____ per _____.
Answer
$1$ watt is a rate of working of one joule per second.
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Question 41 Mark
Fill in the following blanks with suitable word: When a ball is thrown upwards, ______ energy is transformed into ____ energy.
Answer
When a ball is thrown upwards, kinetic energy is transformed into potential energy.
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Question 51 Mark
Fill in the following blanks with suitable word:
The work done on a body moving in a circular path is _______.
Answer
The work done on a body moving in a circular path is zero.
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Question 61 Mark
Fill in the following blanks with suitable word: Power is the rate of doing _____.
Answer
Power is the rate of doing work.
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Question 71 Mark
Fill in the following blanks with suitable word: The principle of _____ of energy says that energy can be _____ From one form to another, but it cannot be _____ or _____.
Answer
The principle of convervation of energy says that energy can be transformed From one form to another, but it cannot be created or destroyed.
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Question 81 Mark
Fill in the following blanks with suitable word:
Work is measured as a product of ________ and ________.
Answer
Work is measured as a product of force and distance.
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Question 91 Mark
Fill in the following blanks with suitable word:
The ability of a body to do work is called _____. The ability of a body to do work because of its motion is called _______.
Answer
The ability of a body to do work is called energy. The ability of a body to do work because of its motion is called kinetic energy.
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Question 101 Mark
Fill in the following blanks with suitable word:
1 joule is the work done when a force of one ______ moves an object through a distance of one ______ in the direction of _______.
Answer
1 joule is the work done when a force of one newton moves an object through a distance of one meter in the direction of force.
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Fill in the blank - Science STD 9 Questions - Vidyadip