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Why can't we use a plain mirror as a side mirror in a scooter or a car

Posted by Dnyanada Singh 1 year, 1 month ago

CBSE > Class 07 > Science

2 answers

Harsh Pal 1 year, 1 month ago

Hint: We all use convex mirrors in the side view of our cars, to see the image of any object's broader field of view that makes us comfortable while driving. Whereas a plane mirror will show the image bigger that makes it uncomfortable while driving. Complete answer: A convex mirror is used instead of a plane mirror because it has a large view angle with always an erect image formation irrespective of the position of the object.Convex mirrors are preferred as rear-view mirrors in vehicles because they provide a broader field of view, allowing the driver to see the majority of the traffic behind him. In cars and vehicles, a convex mirror is favoured as a rear-view mirror because it provides a broader field of view, allowing the driver to see the majority of the traffic behind him. Convex mirrors always reflect the objects in front of them in an erect, imaginary, and shrunken form. Convex mirrors always reflect the items in front of them in a virtual, erect, and shrunken picture. -A virtual picture is always formed by a convex mirror and is always situated behind the mirror. -The picture is vertical and located at the focal point when the item is far away from the mirror. -As the object approaches the mirror, the image follows suit and increases until it reaches the same height as the object. -Convex mirrors produce images that are smaller than the item but become larger as they approach the mirror. Therefore, a convex mirror is used instead of a plane mirror in the side view of a car because the image formed by a convex mirror is smaller and closer to that formed by a plane mirror. Hence, the correct options are (B) and (C). Note: As long as the object is in their focus, concave mirrors in vehicles help to reduce blind spots. The reflecting surface of a concave mirror, on the other hand, bends inwards and away from the light source.

1234 Abcd 1 year, 2 months ago

Because the mirror in a scooter / car show the image very close . So, we don't use plain mirror as it doesn't help us to see the image very close

ANSWER

Explain why there is need of variety of animals and plants in the forest?

Posted by Preetha R 1 year, 2 months ago

CBSE > Class 07 > Science

1 answers

Swastik Tiwari 1 year, 2 months ago

In a forest, there is a need for a variety of animals and plants because they all play important roles in maintaining the ecosystem. Animals help with pollination, seed dispersal, and controlling populations of other organisms. Plants provide food and shelter for animals, while also helping to regulate the climate and produce oxygen. It's like a big, interconnected web where each species has its own vital role to play!

ANSWER

Shat we can get from plants some examples

Posted by Mattam Ravikanth 1 year, 2 months ago

CBSE > Class 07 > Science

1 answers

Naga Seershika 1 year, 2 months ago

We get from plants are: fruits, vegetables, flowers, cotton, paper, ceral grains, and medicine etc...

ANSWER

Why the colour of leaves are green

Posted by Anurag Singh 1 year, 2 months ago

CBSE > Class 07 > Science

5 answers

Nisha I 1 year, 1 month ago

Leaves appear a green pigment called chlorophyll which absorb sunlight

Mriganka Das 1 year, 1 month ago

Because of chlorophyll

Dnyanada Singh 1 year, 2 months ago

There is a green pigment called chlorophyll, which makes the leaf green

Swastik Tiwari 1 year, 2 months ago

Leaves appear green because they contain a pigment called chlorophyll, which absorbs sunlight for photosynthesis.

Mattam Ravikanth 1 year, 2 months ago

Because of photosynthesis

ANSWER

Write a short note on excretion in plants

Posted by Purvika Jadhav 1 year, 2 months ago

CBSE > Class 07 > Science

2 answers

Swastik Tiwari 1 year, 2 months ago

Excretion in plants is an interesting topic. While plants don't have kidneys like humans do, they still have their own way of getting rid of waste. One of the main ways plants excrete waste is through tiny openings called stomata on their leaves. These stomata allow plants to release excess water and gases, like oxygen and carbon dioxide. Plants also excrete waste products through their roots. They release substances like organic acids and ions into the soil, which can affect the pH and nutrient levels around them. This process helps the plants maintain a healthy internal environment. So, even though plants don't excrete waste in the same way as animals do, they have their own unique methods to keep themselves clean and balanced. Nature is pretty amazing, right? Let me know if you have any more questions!

Mattam Ravikanth 1 year, 2 months ago

What we can do with plants some names

ANSWER

Characteristics of the image formed by a concave lens

Posted by Nesrin Fathima 1 year, 2 months ago

CBSE > Class 07 > Science

1 answers

Mattam Ravikanth 1 year, 2 months ago

Example: microscope

ANSWER

What is canvex mirror

Posted by Jatin Saini 1 year, 2 months ago

CBSE > Class 07 > Science

2 answers

Account Deleted 1 year, 2 months ago

A spherical mirror whose reflecting side is bulging out is called convex mirror

Shrishti Singh 1 year, 2 months ago

A spherical mirror whose reflecting surface is bulged outwards or towards the source of light is called convex mirror

ANSWER

what is digestion ?

Posted by Om Suryavanshi 1 year, 2 months ago

CBSE > Class 07 > Science

4 answers

Vasundhara Yadav 1 year ago

Digestion is the process of breaking down the food into simpler form. First we chew food then it passes through from food pipe to our stomach. From stomach when the process is done the food goes to our small intestine but the waste food which should be excreted goes through our large intestine to **** where it comes out from our body.

Sonali Rawat 1 year, 2 months ago

The breakdown of complex components food into simpler substance is called digestion

Chanchal Yadav 1 year, 2 months ago

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Shrishti Singh 1 year, 2 months ago

Digestion is the process by which food is broken down into simple absorbable substances

ANSWER

An electrician is carrying out some repairs in your house. He wants to replace a fuse by a piece of wire. Would you agree? Give reasons for your response.

Posted by Mitansh Bandaru 1 year, 2 months ago

CBSE > Class 07 > Science

2 answers

Shyam Ladli Vaishnavi 1 year, 2 months ago

No, replacing the fuse with a piece of wire is not a good option because fuse is a wire which melts quickly when excess of current pass through it.Thus Breaking the circuit and preventing the home appliances wire used for replacing the fuse might be of same material but it may pass large amount of current that can damage home appliances

Ekamjit Singh 1 year, 2 months ago

The fuse can't be replaced after it is distroyed if he will replace the fuse he may get shocked'

ANSWER

If a ball 7 5 km in 30 minute what will be it speed

Posted by Sneha Jal 1 year, 2 months ago

CBSE > Class 07 > Science

2 answers

Sneha Jal 1 year, 2 months ago

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Ekamjit Singh 1 year, 2 months ago

Formula of speed is Distance/Time If the distance is 75 Km The time is 30 minutes Speed is 75/30 speed is 2.5Kmperhour

ANSWER

If a pendulum oxes 20 times in 5 second what will be the time

Posted by Sneha Jal 1 year, 2 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

If pendulum oscillation 20 time in 5 second what will be the time

Posted by Sneha Jal 1 year, 2 months ago

CBSE > Class 07 > Science

2 answers

Account Deleted 1 year, 2 months ago

Formula is oscillation/time Therefore, 20/5 =1/4 Hence, 0.25

Shrishti Singh 1 year, 2 months ago

Time period will be 20÷5 then we will get 1/4 then the time will be 0.25 sec or min

ANSWER

a spacecraft travels 46000 km in one hour express its time m/s

Posted by Saptarshi Das 1 year, 2 months ago

CBSE > Class 07 > Science

1 answers

Rifat Parween 1 year, 2 months ago

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ANSWER

a train is moving with a velocity of 90 km per hour .it is brought to stop by applying the brakes which produce a retardation of 0.5 m s square inverse find distance before it stops.

Posted by Jahaan Kachhadiya 1 year, 2 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

differentiate between acidic and basic substances

Posted by Ram Soni Soni 1 year, 2 months ago

CBSE > Class 07 > Science

3 answers

Ankush S Bhangekar 1 year, 1 month ago

Acid is sour in taste Base is bitter in taste Base fells soapy when touched And acid not

Rachna Kumari 1 year, 2 months ago

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Aradhya Sharma 1 year, 2 months ago

An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance. A base is a molecule or ion able to accept a hydrogen ion from an acid. Acidic substances are usually identified by their sour taste.

ANSWER

The odometer of a car rates 5732 1.0 km when they clock show the time 8:30 a.m. what is the distance remove by the car if at 8:50 a.m. the odometer reading has changed at 57336.0 km calculate the speed of the car in km/min during this time. Express the speed in km/h also.

Posted by Arindam Suklabaidya 1 year, 2 months ago

CBSE > Class 07 > Science

3 answers

Grishma Parashar 1 year, 2 months ago

57336.0 - 57321.0= 15 km Time =8:50-8:30 am = 20min To change in hour 1hour = 60min So, 20/60 hour = 1/3hour Speed = distace/time = 15km/1/3hour = 45km

Satyam Kumar 1 year, 2 months ago

45 km/h

Gandhar Gondhali 1 year, 2 months ago

Distance covered by car = (57336 - 57321) km = 15 km Time taken between 08:30 AM to 08:50 AM = 20 minutes = 20/60 hour = 1/3 hour So Speed in km/min Speed = (Distance travelled)/ (Time) = (15km)/ (20min) = 0.75km/min Speed in km/h Speed = (Distance travelled)/ (Time) = (15km)/ (1/3h) = (15 x 3) km/ (1h) = 45km/h.

ANSWER

Why light travel straight line

Posted by Naitik Kumar 1 year, 2 months ago

CBSE > Class 07 > Science

5 answers

Vasundhara Yadav 1 year ago

Light travels in a straight line cause it's a ray.

Shyam Ladli Vaishnavi 1 year, 2 months ago

Because because of rectilinear propagation of light

Account Deleted 1 year, 2 months ago

The main reason why light moves in straight lines are because it is a wave and prefers to travel the smallest distance between the two points.

Arsh Anuj 1 year, 2 months ago

Because it's a ray

Arindam Suklabaidya 1 year, 2 months ago

The main reason why light moves in straight lines are because it is a wave and prefers to travel the smallest distance between the two points.

ANSWER

What is deforestation

Posted by J Sarwin 1 year, 2 months ago

CBSE > Class 07 > Science

2 answers

Grishma Parashar 1 year, 2 months ago

Deforestation is indiscriminate cutting,or over harvesting ,of tress for human activities

Dishant Tomar 1 year, 2 months ago

Cutting trees in a large amount is called deforestration. De - decrease Forest - jangal.

ANSWER

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Posted by J Sarwin 1 year, 2 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

Give the name of some metals whose compound are toxic.

Posted by Tazeem Mashooq 1 year, 2 months ago

CBSE > Class 07 > Science

1 answers

Satyam Kumar 1 year, 2 months ago

Mercury

ANSWER

Parasite explain

Posted by Devanshu Gupta 1 year, 3 months ago

CBSE > Class 07 > Science

4 answers

Vasundhara Yadav 1 year ago

Small living organisms that depend on other living organisms for their food. Eg: bacteria, fungi, etc.

Grishma Parashar 1 year, 2 months ago

Mode of nutrition in which non green plants live on other living organisms and obtain their food from them

Dishant Tomar 1 year, 2 months ago

For example- fungi.

Dishant Tomar 1 year, 2 months ago

Something that make their food to help with others.

ANSWER

A car moves with a speed of 40km/h for 15 min and then with a speed of 60km/h for the next 15 min . The total distance covered by the car is : i)100km. ii)25km iii)15km. iv)10km

Posted by Anushka Bhowmick 1 year, 3 months ago

CBSE > Class 07 > Science

5 answers

Anushka Bhowmick 1 year, 2 months ago

The correct answer is 25 km

Viren Pawar 1 year, 2 months ago

69

Anushka Bhowmick 1 year, 3 months ago

25 km is the right answer

Shashi Kumar Sushmitha P.S 1 year, 3 months ago

25 km

Prince Deshwal 1 year, 2 months ago

100

ANSWER

The air tubes of insects____________

Posted by Anushka Bhowmick 1 year, 3 months ago

CBSE > Class 07 > Science

5 answers

Ekamjit Singh 1 year, 2 months ago

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Satyam Kumar 1 year, 2 months ago

Trachea

Anushka Bhowmick 1 year, 3 months ago

Trachea is the correct answer

Shashi Kumar Sushmitha P.S 1 year, 3 months ago

Tracheae

Aasmi Abhale 1 year, 3 months ago

The air tubes of insects : tracheae

ANSWER

An organism with tracheal system ______________

Posted by Anushka Bhowmick 1 year, 3 months ago

CBSE > Class 07 > Science

5 answers

Satyam Kumar 1 year, 2 months ago

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Anushka Bhowmick 1 year, 3 months ago

The correct answer is Ant

Dhyan Narah 1 year, 3 months ago

Cockroach

Mohammed Ayan Haider 1 year, 3 months ago

Coackroach

Shantha Sheela 1 year, 3 months ago

Grasshopper

ANSWER

A ray of light travelling in air enters obliquely into water. Does the light ray bend towards the normal or away from the normal? Why?

Posted by Tumbali Shyam 1 year, 3 months ago

CBSE > Class 07 > Science

1 answers

Anushka Bhowmick 1 year, 3 months ago

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ANSWER

A light ray enters from medium A to medium B as shown in figure. The refractive index of medium B relative to A will be: cbse class 10 Science Light: Reflection and Refraction important questions and answers

Posted by Tumbali Shyam 1 year, 3 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

Define the principle focus of a concave mirror.

Posted by Tumbali Shyam 1 year, 3 months ago

CBSE > Class 07 > Science

1 answers

Aditya Goswami 1 year, 3 months ago

The principal focus of a concave mirror is the point where parallel rays of light either converge (for a converging mirror) or appear to diverge from (for a diverging mirror) after reflection.

ANSWER

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Posted by Arpit Singh 1 year, 3 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

What is Newton disc

Posted by Shourya Mishra 1 year, 3 months ago

CBSE > Class 07 > Science

4 answers

Pankaj Jaiswal 1 year, 3 months ago

The part of teeth which contain never and blood vessel is called

Tumbali Shyam 1 year, 3 months ago

The Newton disc, also known as the disappearing colour disc, is a well-known physics experiment with a rotating disc with segments in different colours appearing as white when it's spun rapidly about its axis. This type of mix of light stimuli is called temporal optical mixing, a version of additive-averaging mixing.

Manasvi Bais 1 year, 3 months ago

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Priya Sehgal 1 year, 3 months ago

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ANSWER

ਵਟ ਹੈਪਨਸ ਟੂ ਦ ਸ

Posted by Paavni Guglani 1 year, 3 months ago

CBSE > Class 07 > Science

0 answers

ANSWER

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