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Angles

Introduction to Lines and Angles

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Sunlight

Reflection of Light

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Better Growth and Pest Control

Reproduction in Unicellular and Multicellular Organisms

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Beginning of Modern Age - Discoveries and Explorations

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The French East India Company and the Carnatic Wars

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Public Distribution System in Kerala

Introduction - Sectors of the Indian Economy

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Noun Phrases

Interrogative Sentences - Auxilliary Start

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• running is a noun

Q

iT'S A VERB

A
• which mirror is used in headlights

Q

Which mirror is used in headlights?
Answer:  Concave mirrors are commonly used in not only vehicles headlights but also in torches and search-lights to get powerful parallel beams of light to focus the light at the longer distances by placing the source of light at the focus of the Concave mirrors.

For example if a small toy of a tree is placed at the focus of the concave mirror the image of the objct is formed as shown in the following figure.

A
• Which mirror is used in headlights?

Q

Concave mirror is used in headlights of vehicles.. because this mirror converge the light rays comming frm the focus(ie, bulb is fitted at the focus of the mirror) will be reflected back in the form of long parallel rays...

Diagram: light rays emerge frm point of focus of a concave mirror and the mirror reflects this rays backin the form of parallel rays...

A
• Food spoil

Q

Food gets spoiled due to the oil and fat containing substances in them. When these substances come in contact with air they gets oxidised abn starts giving bad smell and taste. This process can simply be remembered as 'Rancidity'.

A
• distance travelled 150,time taken 5hr,find the average speed___________

Q

speed =dist\time
so speed=30km/hour

A
• anil and alex are car drivers. anil drove 180km in 4hr and alex drove 230km in 5hr. whose average speed is greater?

Q

average speed of alex is greater

A
• A car travels at an average speed of 45 km/hr. how far does it travels in one minute in average

Q

0.75  km

A
• how do we hear?

Q

sound waves enter our hear and then processed ..
that enable us to hear

A
• what is vibration?

Q

very fast to and fro motion.

A
• what is sonar device?

Q

device used in ships to identify the depth of sea.

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