10. Which kind of mirrors are used in the headlights of a motor-car and why? [Foreign] -Chemistry-10

10. Which kind of mirrors are used in the headlights of a motor-car and why? [Foreign] -Chemistry-10
by

1 Answer

Answer :

Answer. Concave mirror, to get the parallel beam of light.
by

Related questions

13. A ray of light, incident obliquely on a face of a rectangular glass slab placed in air, emerges from the opposite face parallel to the incident ray. State two factors on which the lateral displacement of the emergent ray depends. [Foreign] -Chemistry-10

Description : 13. A ray of light, incident obliquely on a face of a rectangular glass slab placed in air, emerges from the opposite face parallel to the incident ray. State two factors on which the lateral displacement of the emergent ray depends. [Foreign] -Chemistry-10

Last Answer : Lateral displacement depends on the: angle of incidence, thickness of slab, and refractive index of the material. (any two)

What are metalloids? Explain by giving examples. -Chemistry-10

Description : What are metalloids? Explain by giving examples. -Chemistry-10

Last Answer : Metalloids are elements which show some properties of metals and some properties of non-metals. Examples: Silicon, boron, arsenic, antimony, germanium, tellurium, polonium.

What happens when baking soda is heated? -Chemistry-10

Description : What happens when baking soda is heated? -Chemistry-10

Last Answer : Sodium hydrogen carbonate (also known as sodium bicarbonate or bicarbonate of soda) has the chemical formula NaHCO3. When it is heated above about 80°C it begins to break down, forming sodium carbonate, water and carbon dioxide. This type of reaction is called a thermal decomposition.

Why is plaster of paris stored in a moisture proof container? -Chemistry-10

Description : Why is plaster of paris stored in a moisture proof container? -Chemistry-10

Last Answer : Plaster of Paris in contact with moisture (water) changes to solid hard mass, gypsum. Therefore, it gets wasted. Hence it should be stored in moisture proof containers.

(i) Substances oxidised is Na as it gains oxygen and oxygen is reduced. (ii) Substances reduced is Cu as hydrogen is oxidised as it gains oxygen. -Chemistry-10

Description : (i) Substances oxidised is Na as it gains oxygen and oxygen is reduced. (ii) Substances reduced is Cu as hydrogen is oxidised as it gains oxygen. -Chemistry-10

Last Answer : During this reaction, the sodium is gaining oxygen and is being oxidized. Oxygen is getting reduced. During this reaction, copper oxide is losing oxygen and is being reduced. The hydrogen is gaining oxygen and is being oxidized.

Identify the substances that are oxidised and the substances which are reduced in the following reactions. (i) 4Na(s) + O2(g) → 2Na2O(s) (ii) CuO (s) + H2(g) → Cu (s) + H2O(l) -Chemistry-10

Description : Identify the substances that are oxidised and the substances which are reduced in the following reactions. (i) 4Na(s) + O2(g) → 2Na2O(s) (ii) CuO (s) + H2(g) → Cu (s) + H2O(l) -Chemistry-10

Last Answer : (i) Substances oxidised is Na as it gains oxygen and oxygen is reduced. (ii) Substances reduced is Cu as hydrogen is oxidised as it gains oxygen.

Give an example of a double displacement reaction other than the one given in Activity 1.10 -Chemistry-10

Description : Give an example of a double displacement reaction other than the one given in Activity 1.10 -Chemistry-10

Last Answer : Sodium hydroxide and hydrochloric acid react to form sodium chloride and water.

An iron nail is dipped in the solution of copper sulphate for about 30 minutes. State the change in colour observed. Give reason for the change. -Chemistry-10

Description : An iron nail is dipped in the solution of copper sulphate for about 30 minutes. State the change in colour observed. Give reason for the change. -Chemistry-10

Last Answer : When an iron nail is dipped in copper sulphate solution, the displacement reaction takes place. The colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate.

Why does the colour of copper sulphate solution change when an iron nail is dipped in it ? -Chemistry-10

Description : Why does the colour of copper sulphate solution change when an iron nail is dipped in it ? -Chemistry-10

Last Answer : When an iron nail is dipped in copper sulphate solution, the displacement reaction takes place. The colour of copper sulphate solution fades due to the formation of light green solution of iron sulphate.

Why is the amount of gas collected in one of the test tubes in text book Activity 1.7 (i.e., electrolysis of water) double of the amount collected in the other? Name this gas. -Chemistry-10

Description : Why is the amount of gas collected in one of the test tubes in text book Activity 1.7 (i.e., electrolysis of water) double of the amount collected in the other? Name this gas. -Chemistry-10

Last Answer : In Activity 1.7, water is electrolysed to give H2 gas at one electrode and O2 gas at the other electrode. 2H2O(l) → 2H2(g) + O2(g) Thus two molecules of water on electrolysis give two ... oxygen gas or in other words the amount of hydrogen gas collected would be double than that of oxygen gas.

A solution of a substance ‘X’ is used for white washing. (i) Name the substance ‘X’ and write its formula. (ii) Write the reaction of the substance ‘X’ named in (i) above with water. -Chemistry-10

Description : A solution of a substance ‘X’ is used for white washing. (i) Name the substance ‘X’ and write its formula. (ii) Write the reaction of the substance ‘X’ named in (i) above with water. -Chemistry-10

Last Answer : (i) The substance whose solution in water is used for white washing is calcium oxide (or quick lime). Its formula is CaO.

Write a balanced chemical equation with state symbols for the following reactions : -Chemistry-10

Description : Write a balanced chemical equation with state symbols for the following reactions : -Chemistry-10

Last Answer : (i) BaCl2 (aq) + Na2SO4 (aq) → BaSO4(s) + 2NaCl (aq) (ii) NaOH (aq) + HCl(aq) → NaCl(aq) + H2O(l)

Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen -Chemistry-10

Description : Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate + Aluminium chloride (iii) Sodium + Water → Sodium hydroxide + Hydrogen -Chemistry-10

Last Answer : (i) H2 + Cl2 → 2HCl (ii) 3 BaCl2 + Al2(SO4)3 → BaSO4 + 2 AlCl3 (iii) 2Na + 2H2O → 2NaOH + H2↑

Why should a magnesium ribbon be cleaned before burning in air ? -Chemistry-10

Description : Why should a magnesium ribbon be cleaned before burning in air ? -Chemistry-10

Last Answer : Magnesium gets covered with a layer of magnesium oxide when kept in air for a long time. This layer hinders the burning of magnesium. Hence, it is to be cleaned before burning.

15. An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a convex lens at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the screen. What is the focal length of the conve -Chemistry-10

Description : 15. An object 2 cm high is placed at a distance of 64 cm from a white screen. On placing a convex lens at a distance of 32 cm from the object it is found that a distinct image of the object is formed on the screen. What is the focal length of the conve -Chemistry-10

Last Answer : Since, object-screen distance is double of object-lens separation, the object is at a distance of 2f from the lens and the image should be of the same size of the object.

14. An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the -Chemistry-10

Description : 14. An object 2 cm in size is placed 30 cm in front of a concave mirror of focal length 15 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? What will be the nature and the size of the -Chemistry-10

Last Answer : Answer. hope this helps you

12. Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed: -Chemistry-10

Description : 12. Draw ray diagrams to represent the nature, position and relative size of the image formed by a convex lens for the object placed: -Chemistry-10

Last Answer : Answer. hope this helps you

11. Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface. [Delhi] -Chemistry-10

Description : 11. Explain with the help of a diagram, why a pencil partly immersed in water appears to be bent at the water surface. [Delhi] -Chemistry-10

Last Answer : Answer. Light from different points on the pencil, immersed in water refracts and appears to come from a point above the original position.

7. Redraw the given diagram and show the path of the refracted ray: [All India(C)] -Chemistry-10

Description : 7. Redraw the given diagram and show the path of the refracted ray: [All India(C)] -Chemistry-10

Last Answer : Answer. hope this helps you

6. “The refractive index of diamond is 2.42”. What is the meaning of this statement in relation to speed of light? [Delhi] -Chemistry-10

Description : 6. “The refractive index of diamond is 2.42”. What is the meaning of this statement in relation to speed of light? [Delhi] -Chemistry-10

Last Answer : Answer. hope this helps you

5. The refractive indices of four media A, B, C and D are given in the following table: -Chemistry-10

Description : 5. The refractive indices of four media A, B, C and D are given in the following table: -Chemistry-10

Last Answer : (i) Minimum change is seen as light moves between 1.50 and 1.52, i.e. B and C. (ii) Maximum change when light moves between 1.33 and 2.40, i.e. A and D.

4. If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray. [Delhi (C)] -Chemistry-10

Description : 4. If a light ray IM is incident on the surface AB as shown, identify the correct emergent ray. [Delhi (C)] -Chemistry-10

Last Answer : Answer. Ray NQ, as it has to be parallel to ray OS.

3. Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: -Chemistry-10

Description : 3. Draw the ray diagram in each case to show the position and nature of the image formed when the object is placed: -Chemistry-10

Last Answer : Answer. Nature of image: Real, inverted and same size image is formed at the centre of curvature. Nature of image: Virtual, enlarged and erect image is formed behind the mirror. Nature of image: ... image: Virtual, erect and diminished image is formed between O and F on the same side of object.

2. An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens. [All India] -Chemistry-10

Description : 2. An object 50 cm tall is placed on the principal axis of a convex lens. Its 20 cm tall image is formed on the screen placed at a distance of 10 cm from the lens. Calculate the focal length of the lens. [All India] -Chemistry-10

Last Answer : this is the answer for the respected question

1. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. [Delhi] -Chemistry-10

Description : 1. A concave lens has focal length of 20 cm. At what distance from the lens a 5 cm tall object be placed so that it forms an image at 15 cm from the lens? Also calculate the size of the image formed. [Delhi] -Chemistry-10

Last Answer : Answer. hope this helps youu

Parabolic mirros are used in – (1) Car headlights (2) Driving mirrors (3) Dentists mirros (4) Shaving mirros

Description : Parabolic mirros are used in – (1) Car headlights (2) Driving mirrors (3) Dentists mirros (4) Shaving mirros

Last Answer : (1) Car headlights Explanation: A parabolic reflector (mirror) transforms an incoming plane wave traveling along the axis into a spherical wave converging toward the focus. Since the principles of ... focus outward in a parallel beam, used in devices such as spotlights and car headlights.

Parabolic mirros are used in (1) Car headlights (2) Driving mirrors (3) Dentists mirros (4) Shaving mirros

Description : Parabolic mirros are used in (1) Car headlights (2) Driving mirrors (3) Dentists mirros (4) Shaving mirros

Last Answer :  Car headlights

When at night a driver should dim his headlights when an oncoming motor vehicle comes within?

Description : When at night a driver should dim his headlights when an oncoming motor vehicle comes within?

Last Answer : At night a driver should dim his headlights when an oncomingmotor vehicle comes within 1,000 feet.You should switch your headlights from full beam to dipped beamwhen a oncoming car passes. It is unsafe to leave your headlightson full beam as it blinds the driver of the oncoming car.

Convex mirrors are used as a rear view mirror in motor cycles because (1) it forms real image (2) it forms erect (upright) image (3) it forms smaller image as compared with object (4) All of the above

Description : Convex mirrors are used as a rear view mirror in motor cycles because (1) it forms real image (2) it forms erect (upright) image (3) it forms smaller image as compared with object (4) All of the above

Last Answer : (3) it forms smaller image as compared with object Explanation: It is because image formed by an convex mirror is always virtual, erect and smaller than the object.

Convex mirrors are used as a rear view mirror in motor cycles because (1) it forms real image (2) it forms erect (upright) image (3) it forms smaller image as compared with object (4) All of the above

Description : Convex mirrors are used as a rear view mirror in motor cycles because (1) it forms real image (2) it forms erect (upright) image (3) it forms smaller image as compared with object (4) All of the above

Last Answer : it forms smaller image as compared with object

What kind of headlights are these? (see description)

Description : What kind of headlights are these? (see description)

Last Answer : From your link… These BMW headlight upgrades come standard at this price with a pair of Plug and Play adapters to connect your stock USA wiring, making the upgrade very smooth.

Approximately when did car makers stop using two headlights (and start using one with a high beam filament)?

Description : Approximately when did car makers stop using two headlights (and start using one with a high beam filament)?

Last Answer : I’m sure that I’ve seen late-model BMW and Chevy cars with separate high/low beam headlights. And I’ve seen models from the 1970s which had single-lamp assemblies with the high and low beam filaments built into the lamp, as you suggest.

Can plastic headlights on a car be cleared up?

Description : Can plastic headlights on a car be cleared up?

Last Answer : This should help. http://www.youtube.com/watch?v=gMwQpmY1_8M

One of my car headlights has become very dim. Possible causes?

Description : One of my car headlights has become very dim. Possible causes?

Last Answer : Check the wire connection, if it is stable, yup you need a new bulb!

A man is driving in his car, there are no headlights or streetlights for him to see the road. But somehow, he saw an old lady crossing the street and stopped for her. How is this possible if there are no lights? -Riddles

Description : A man is driving in his car, there are no headlights or streetlights for him to see the road. But somehow, he saw an old lady crossing the street and stopped for her. How is this possible if there are no lights? -Riddles

Last Answer : It was daytime!!

A black dog stands in the middle of an intersecton in a town painted black. None of the street lights are working due to a power failure caused by a storm. A car with two broken headlights drives towards the dog but turns in time to avoid hitting him. How could the driver have seen the dog in time? -Riddles

Description : A black dog stands in the middle of an intersecton in a town painted black. None of the street lights are working due to a power failure caused by a storm. A car with two broken headlights drives ... turns in time to avoid hitting him. How could the driver have seen the dog in time? -Riddles

Last Answer : Who said this happened during the night?

What would happen if you drove your car close to the speed of light and turned on the headlights? -Physics

Description : What would happen if you drove your car close to the speed of light and turned on the headlights? -Physics

Last Answer : Light in vacuum always travels at the same speed c, exactly 299,792,458 meters per second, no matter how it is created or in what frame it is observed. If you drove a car close to the speed ... space is much more feasible, but even then the sparse space dust starts to cause problems at such speeds.

How many mirrors are used inside the car ?

Description : How many mirrors are used inside the car ?

Last Answer : A mirror is usually used inside the front of the car.

Heated car mirrors

Description : Is that a good thing? Do you use it? Does it make sense to take this into account when buying a new car?

Last Answer : I have it but I've never used it so I don't even know if it works.

Must have car rear view mirrors?

Description : Won't I get fined for it if I don't have them at the moment?

Last Answer : Rear view mirrors are mandatory and you will definitely get a fine. The driver is obliged to monitor the traffic in front of him, behind him and next to him. And adapt the ride to the given situation.

What inspired reflecting road lights to be invented? A. Car door reflecting mirrors B. The light a cat’s eyes gave off on a fence (Answer) C. Sun light on steel posts on road sides D. The sun light on the windshield

Description : What inspired reflecting road lights to be invented? A. Car door reflecting mirrors B. The light a cat’s eyes gave off on a fence (Answer) C. Sun light on steel posts on road sides D. The sun light on the windshield

Last Answer : B. The light a cat’s eyes gave off on a fence (Answer)

Pet peeve #822: Why don't some drivers turn on their headlights at dawn and dusk?

Description : Pet peeve #822: Why don't some drivers turn on their headlights at dawn and dusk?

Last Answer : answer:They may have things on their mind and haven’t really noticed how dark it is getting. Not right, but it happens. I remember driving home one night. I was severely overworked at the time. The freeway was well lit and I suddenly realized I hadn’t turned my lights on!

Do you think new vehicles should come with self dimming headlights?

Description : Do you think new vehicles should come with self dimming headlights?

Last Answer : You wouldn't believe on how the amount of people that don't dim their headlights to on coming traffic, I am talking about roughly 7 out of 10 cars that don't dim to on coming traffic, and 4 out of ... at least half a dozen times, and 3 that just don't and leave their lights on high beam regardless.

Does it seem to you, that a lot of on coming drivers don't bother to dim their high beam headlights anymore?

Description : Does it seem to you, that a lot of on coming drivers don't bother to dim their high beam headlights anymore?

Last Answer : I chalk it up to the fact that driving these days is something you do while amusing yourself with other stuff. To remember to dim, you have to A) be aware that your high-beams are on, and B) be ... driving. What gets me is that they never even seem to wonder why you're flashing your lights at them.

Is there a valid reason, in terms of technology or wiring, for it taking, like a hundred years, for them to start manufacturing cars where the default is that your headlights turn off when you turn off your ignition?

Description : Is there a valid reason, in terms of technology or wiring, for it taking, like a hundred years, for them to start manufacturing cars where the default is that your headlights turn off when you turn off your ignition?

Last Answer : answer:Volvo and Saab have had it for years. When I had my ‘82 Volvo, I left my lights on all the time, because they’d go off when i turned off the car. I think it’s not on American cars because of a lack of imagination.

How do I turn the headlights off on our 2005 Buick Century?

Description : How do I turn the headlights off on our 2005 Buick Century?

Last Answer : You could pull the fuse.

Why do people drive in broad daylight with their headlights on?

Description : Why do people drive in broad daylight with their headlights on?

Last Answer : Are you sure it’s headlights? Or is it their “running lights”? Two of my lights are always on when my car is running.

Why are headlights glass and taillights plastic?

Description : Why are headlights glass and taillights plastic?

Last Answer : Headlights are much hotter, and would eventually melt the plastic.

Are there any tutorial online on how to adjust projector headlights?

Description : Are there any tutorial online on how to adjust projector headlights?

Last Answer : Go to the manufacturers web site.I found info there for my lights.

If you were traveling at the speed of light would you be able to see someones headlights behind you?

Description : If you were traveling at the speed of light would you be able to see someones headlights behind you?

Last Answer : The speed of light is constant from every reference frame.