# WORK,POWER AND ENERGY

## Unit – VI WORK,POWER AND ENERGY - PHYSICS

Congratulations - you have completed Unit – VI WORK,POWER AND ENERGY - PHYSICS. You scored %%SCORE%% out of %%TOTAL%%. Your performance has been rated as %%RATING%%
 Question 1
Work done by the force is said to be negative, if the displacement of a body is ………….
 A Along the force B against the force
 Question 2
Pick the odd once out from the following based on the nature of energy possessed by them.
 A moving car B water stored in a tank C a book on a table D ceiling fan in off position
 Question 3
Commercial unit of electrical energy is …………..
 A joule B joule/second C watt D kilowatt hour
 Question 4
The SI unit of work is ……………..
 A watt B joule
 Question 5
Capacity of doing work is called …………….
 A power B energy
 Question 6
Work done = power x …………….
 A time taken B displacement
 Question 7
The SI unit of work is ………………
 A joule B watt C newton D killogram
 Question 8
Energy possessed by an object due to its motion is called
 A potential energy B gravitational potential energy C conventional energy D kinetic energy
 Question 9
An example for potential energy
 A an apple falling B moving water C compressed spring D rotating mixie
 Question 10
An example for kinetic energy
 A an apple falling B a book lying on the table C water stored in a reservoir D a ball at rest
 Question 11
The init of power is ……………..
 A joule B watt
 Question 12
Electricity can produce ………… when passed through a resistance.
 A heat B light
 Question 13
One kilowatt – hour = ……………
 A 3600000 J B 1000 J
 Question 14
Electric energy is converted into mechanical energy ……………………
 A Electric motor B Photoelectric cell C Electric heater D Light bulb
 Question 15
Solar energy is converted into electrical energy………………
 A Electric motor B Photoelectric cell C Electric heater D Light bulb
 Question 16
Electrical energy is converted into heat energy ……………….
 A Electric motor B Photoelectric cell C Electric heater D Light bulb
 Question 17
Solar energy is converted into chemical energy………………..
 A Electric motor B Photoelectric cell C Photosynthesis in plants D Light bulb
 Question 18
Electrical Energy is converted into light energy…………………
 A Electric motor B Photoelectric cell C Photosynthesis in plants D Light bulb
 Question 19
Match the following:       Quantity                                           Unit
1. Kinetic energy -                 a) newton
2. Electrical energy -           b) watt
3. Power -                          c) joule
4. Force -                        d) kilowatt hour
 A 3 4 1 2 B 4 3 1 2 C 1 3 4 2 D 2 4 1 3
 Question 20
Match the following:
1. 1 Megawatt - a) W = F x S
2. 1 Kilowatt hour -           b) mgh
3. Kinetic energy - c) 106 joules / second
4. Work - d) 3600000 joules
5. Potential energy -           e) ½ mv2
 A 3 4 5 1 2 B 4 3 1 2 5 C 4 5 1 2 3 D 2 4 1 3 5
 Question 21
• Assertion (A) : Windmills transform wind energy into mechanical energy.
•     Reason (R)     : Energy cannot be converted from one form to another.
 A A is correct, R is wrong B A is wrong, R is correct C A is correct, R explains A D Both A and R are correct
 Question 22
• Assertion (A) : If the body is displaced in the same direction as the force, the work is said to be done against the    force.
•     Reason (R)    : Energy is the capacity to do work.
 A A is correct, R is wrong B A is wrong, R is correct C A is correct, R explains A D Both A and R are correct
 Question 23
• Assertion (A) : Heat is a form of energy.
•     Reason (R)     : Heat can do work. Eg. Steam engine
 A A is correct, R is wrong B A is wrong, R is correct C A is correct, R explains A D Both A and R are correct
 Question 24
High melting and boiling points ………….. Compounds
 A Ionic B Covalent
 Question 25
Low melting and boiling points ……………... Compounds
 A Ionic B Covalent
 Question 26
Transfer of electrons formed by ……………… Compounds
 A Ionic B Covalent
 Question 27
Sharing of electrons formed by ……………… Compounds
 A Ionic B Covalent
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There are 27 questions to complete.

### Winmeen

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