Home
About
FAQs
System Requirements
In the news
Workshops
Training
Training Calendar
Request for Training
Training Status
Registration
For Teachers
For Students
For Schools
Contact us
Login
Languages
English
हिंदी
മലയാളം
मराठी
ಕನ್ನಡ
you are here->
home
->
Science
->
Class 7
->
Working Principle of a Rubber Dropper
Working Principle of a Rubber Dropper
Theory
Theory
Procedure
Simulator
Viva Voce
Resources
Feedback
1)
When rubber dropper is pressed keeping its nozzle inside the water, air is released as
Droplet
Bubbles
Foam
Water vapour
2)
Select the option that does not use the mechanism similar to rubber dropper
Uniform level of water in two connected containers
Working of rubber sucker
Working of a syringe
Drinking through straw
3)
Water rises into the dropper on releasing the bulb because of
The muscular force we applied on the bulb
Air pressure on the surface of the water
Water pressure inside the beaker
Shape of rubber bulb
4)
What is pressure?
Amount of molecules in the container
Magnitude of total force in a given direction
Weight of the object
Force exerted per unit area
5)
Pressure can be exerted by
Liquids only
Solids, liquids and gases
Solids only
Solids and liquids only
6)
The instrument used to measure atmospheric pressure is
Ammeter
Thermometer
Calorimeter
Barometer
7)
SI unit of pressure is
Pascal
Joule
Newton
Watt
8)
Water does not come out unless rubber bulb is pressed because
Difference in pressure of air and water is very large
Pressure on water equals atmospheric pressure
The nozzle is too small for water to come out unless it is pressed
Pressure of air outside is greater than the pressure of water inside the dropper
9)
As the surface area increases
Pressure remains the same
Liquid pressure increases whereas air pressure decreases
Pressure decreases
Pressure increases
10)
Identify the incorrect application of pressure
Bags are provided with broad straps
Vehicles carrying heavy loads have more tyres
Peeling vegetables with blunt knife
Spikes at the bottom of football shoes