# NCERT Exemplar Solutions Class 7 Science Solutions for Winds, Storms and Cyclones - Exercise in Chapter 8 - Winds, Storms and Cyclones

Question 1 Winds, Storms and Cyclones - Exercise

A fire alarm usually detects smoke in case of fire. Where should such an alarm be placed in a room?

(a) Near the door

(b) On the floor

(c) On any wall

(d) On the ceiling

The answer is (d) On the ceiling

Explanation:

In case of fire, the air above the fire gets heated hence fire alarms are set on the ceiling

Video transcript
"hello everyone my name is shusher and welcome back to another homework session of plato let's take a look at today's question write t for true and f for false for each of the statements given below and this statement is the sum of two perfect squares is a perfect square all right so what you're going to do we're going to take an example of two perfect squares and then we'll add them up and see so let's take example let's take the square of 2 square 2 square is 4 and 3 square 3 square is 9 let's add them up let's add 2 square plus 3 square so 4 plus 9 correct this is 13 it is not a perfect square right not a perfect square let's take example of 4 square and 5 square 4 square is 16 5 square is not 5 square let's take example of 4 square and 3 square all right so 3 square is already 9 so let's add up 3 square and 4 squared this is 3 square is 9 4 square is 16 this is 25 25 is a perfect square root because it is the square of 5 so is a perfect square so what do i see i see that sometimes i am getting a perfect square and sometimes i will not get a perfect square right so is the given statement correct they are saying the sum of two perfect square is a perfect square so they are basically implying that whenever you add two perfect squares you will get a perfect square which is not the case as a as i've seen in the first example that we're getting not a perfect square so it can be any any any number right it can either be a perfect square and it may not be a perfect square so it is not necessary that the sum of the perfect square will be therefore the given statement is false all right it is not necessary that the sum of two perfect square is always a perfect square all right it can be any number so that's it for this question if you have any doubt you can drop a comment and don't forget to like and subscribe to this channel for regular updates thank you i'll see you next time "
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