To expel hot air out of the kitchen, ‘A’ has an exhaust fan fitted on the window of her kitchen and ‘B’ has a similar exhaust fan fitted on the wall near the ceiling of her kitchen. Which of the exhaust fan will expel the hot air more effectively? Explain why?
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Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens.
Sudha should move the screen towards the lens so as to obtain a clear image of the building. The approximate focal length of this lens will be l5 cm. The...
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Sudha finds out that the sharp image of the window pane of her science laboratory is formed at a distance of 15 cm from the lens
Sudha should move the screen towards the lens so as to obtain a clear image of the building. The approximate focal length of this lens will be l5 cm. The...
1 Answers 1 views
A solar water heater cannot be used to get hot water on (a) a sunny day (b) a cloudy day (c) a hot day (d) a windy day
(b) A cloudy day
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Sheena was very excited to see her Aunt after a long time. Her mother fried a lot of snacks for her Aunt. Suddenly Sheena came to know that
(i) When food is kept for a very long time, it gets oxidized and becomes rancid. (ii) Sheena suggested her mother to keep the snacks in an air tight container. (iii) Intelligence,...
1 Answers 1 views
Write the similarities and differences between the motion of a bicycle and a ceiling fan that has been switched on.
Similarity : Both show a circular motion. Difference : Bicycle shows a rectilinear motion whereas a ceiling fan does not.
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Farah got married 8 years ago. Today her age is 1 2/7 times her age at the time of her marriage.
(c) Let Farah’s age at the time of her marriage be x. Then, (x +8)= x x 9/7 9x /7 -8 =8 x=8*7/2= 28 years Farah’s present age = 28 + 8 =...
1 Answers 3 views
Have you ever burnt your tongue when you ate or drank something that was too hot? How do you cool some food when it is too hot?
Yes, I had once burnt my tongue on drinking very hot tea. When some food is very hot, I cool it by blowing on it, by keeping it in a...
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Your grandmother feels she has reduced her upper body flexibility and therefore she wants to test herself, which test would you suggest her ?
Back scratch test for upper body flexibility
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Walking towards the kitchen with Mridu and Meena, Rukku Manni began to laugh. What made her laugh?
Walking towards the kitchen with Mridu and Meena, Rukku Manni remembered that Gopu Mama was always in a hurry to throw off his shoes and socks, and get into his...
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Hydrogen fuel cell vehicles produce one of the following as "exhaust"
(c) A hydrogen vehicle is an alternative fuel vehicle that uses hydrogen as its onboard fuel for motive power. The hydrogen vehicle use hydrogen fuel cell for generation of motive...
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