1.Name the force which is always attractive in nature.
2.Suggest the way to increase the fuel efficiency of racing cars.
3.What are the major sources of notice pollution?
4.Write the uses of plastics in healthcare.
5.Name any two metals which catch fire in air.
6.When you take off wollen or polyester clothes your hair stands on end.why?
7.What are the main causes of an earthquake?
8.Write about virtual images.
9.Why do the stars appear to us like point objects?
10.Why flame tends to move upward?
Answers
Answer:
1) gravitational force
Answer:
1) The answer is - Gravitational force
2) Sorry don't know
3) I think it's noise pollution so the answer would be
Industrial Sources
(ii) Transport Vehicles
(iii) Household
(iv) Public Address System
(v) Agricultural Machines
(vi) Defence Equipment
4) The uses of plastics in healthcare are:-
~ Plastic packaging of medicines
~ Insulin pens
~ Inhalation mask
~ I V tubes
~ Examination gloves
~ syringe
~ Droppers
~ disposable gowns
~ Tubing of dialysis and etc...
5) Sodium and potassium are the two metals which catch fire in air.
6) The electrically charged cloth exerts an electrostatic force on our hair and attracts them. As a result they stand. our hair stands when we take off woollen or polyester cloth because these clothes gets electric charge by friction.
7) The main causes of earthquakes fall into five categories:
Volcanic Eruptions. The main cause of the earthquake is volcanic eruptions.
Tectonic Movements. The surface of the earth consists of some plates, comprising of the upper mantle. ...
Geological Faults. ...
Man-Made. ...
Minor Causes.
8). Virtual images - The image that is formed by a plane mirror could not be obtained on a screen. Such type of image is known as virtual image.
9) The stars are much bigger than the earth, yet they appear to us like point objects because they are millions of kilometres farther away ...
10). A flame is a hot glowing body of ignited gas. However a flame always point upwards because the flame's gas is hotter than the surrounding air and a hot gas is always lighter or less dense than a cold gas.