Physics
Grade-9
Easy
Question
Which is cheaper?
- Incandescent bulb
- Halogen bulb
- CFL
- All of them have same price
Hint:
- Lower the efficiency cheaper the price
The correct answer is: CFL
- Lower the efficiency cheaper the price
- efficiency of Halogen is lowest
- Generally, the cheapest light bulbs to buy are halogen – however they tend to have the highest lifetime cost. It's easy to buy a cheap halogen as low as $3, compared to an equivalent CFL at around $6 and LED at $10.
Related Questions to study
Physics
What is the efficiency of a CFL?
What is the efficiency of a CFL?
PhysicsGrade-9
Physics
What is the efficiency of a halogen bulb?
What is the efficiency of a halogen bulb?
PhysicsGrade-9
Physics
What is the cost a tenant will pay if the meter reading was initially 0000 and now it is as shown in the image? Cost per unit is 8 Rs.
What is the cost a tenant will pay if the meter reading was initially 0000 and now it is as shown in the image? Cost per unit is 8 Rs.
PhysicsGrade-9
Physics
A family has a record of 09877 for the previous electric bill, and the current bill reads 09897 for the consumption in one month. What is the total electric consumption of the family?
A family has a record of 09877 for the previous electric bill, and the current bill reads 09897 for the consumption in one month. What is the total electric consumption of the family?
PhysicsGrade-9
Physics
What is the meter reading?
What is the meter reading?
PhysicsGrade-9
Physics
What is the meter reading?
What is the meter reading?
PhysicsGrade-9
Physics
Which is the correct reading of the electric meter?
Which is the correct reading of the electric meter?
PhysicsGrade-9
Physics
When the pointer is in between two numbers in an electric meter, which will be recorded?
When the pointer is in between two numbers in an electric meter, which will be recorded?
PhysicsGrade-9
Physics
Which number needs to be ignored in a digital meter?
Which number needs to be ignored in a digital meter?
PhysicsGrade-9
Physics
How many dials are there in an analog electric meter whose reading is considered?
How many dials are there in an analog electric meter whose reading is considered?
PhysicsGrade-9
Physics
Identify the given meter.
Identify the given meter.
PhysicsGrade-9
Physics
Identify the given meter.
Identify the given meter.
PhysicsGrade-9
Physics
Identify the given meter.
Identify the given meter.
PhysicsGrade-9
Physics
Which number needs to be ignored in a standard mechanical meter?
Which number needs to be ignored in a standard mechanical meter?
PhysicsGrade-9
Physics
How will you read a standard mechanical meter?
How will you read a standard mechanical meter?
PhysicsGrade-9
