Solved Questions on Work and Energy
1. What type of energy is converted into mechanical energy in a car?
a) Solar energy
b) Wind energy
c) Chemical energy from fuel
d) Muscular energy
Answer: c) The type of energy that is converted into mechanical energy in a car is chemical energy from fuel.
2. Which of the following is not an application of solar energy?
a) Heating water
b) Powering cars
c) Generating electricity for homes
d) Cooking food
Answer: b) Solar energy is not commonly used as the primary source of power for cars, unlike heating water, generating electricity for homes, or cooking food.
3. Which of the following is an example of using wind energy?
a) Riding a bicycle
b) Using a solar-powered calculator
c) Flying a kite
d) Watching TV
Answer: c) Flying a kite is an example of using wind energy. When a kite is flown, it captures the kinetic energy of the wind, which causes the kite to soar.
4. Match the following.
|
Column I
|
Column II
|
|
1. Solar cooker
|
A) Uses wind turbines to generate electricity.
|
|
2. Electric car
|
B) Uses the energy of flowing water to generate electricity.
|
|
3. Hydroelectric power plant
|
C) Relies on electrical energy for transportation.
|
|
4. Wind farm
|
D) Utilises solar energy to cook food.
|
a) 1:D, 2:C, 3:B, 4:A
b) 1:A, 2:C, 3:D, 4:B
c) 1:D, 2:A, 3:B, 4:C
d) 1:B, 2:C, 3:A, 4:D
Answer: a) Solar cooker: Utilizes solar energy to cook food.
Electric car: Relies on electrical energy for transportation.
Hydroelectric power plant: Uses the energy of flowing water to generate electricity.
Wind farm: Uses wind turbines to generate electricity.
5. How is the energy from flowing water harnessed in a hydroelectric power plant?
a) Through solar panels
b) With wind turbines
c) Using turbines and generators
d) By burning fuel
Answer: c) Turbines and generators are used in hydroelectric power plants to harness the energy from flowing water.
FAQs on Work and Energy
1. What is work, and how is it related to energy?
Work is the use of energy to transform or move something. Consider using your energy to raise your bags as an example of work.
2. How is energy different from work?
Energy is what makes you able to work. It looks like one has superhuman abilities. When we properly put that power to use, we are at work.
3. How is energy transferred when we do work?
Our energy is directed towards the task at hand as we work. Similar to how you kick a ball to make it move.
4. What are the different types of energy?
Energy comes in a variety of forms. Examples include potential energy, which is stored energy, kinetic energy, or the energy of motion, and even the energy found in food.
5. What is an example of kinetic energy getting applied?
Kinetic energy is used in bike riding; the quicker you pedal, the more energy you use to move.
