Question
Represent with structure of the functional group of soap and detergent.
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A rainbow is an example of dispersion of sunlight. Justify this statement by explaining, with a neat labelled diagram, the formation of a rainbow in the sky. List two essential conditions for observing a rainbow.
Five solutions A, B, C, D and E, when tested with universal indicator showed pH as 4, 1, 11, 7 and 9 respectively. Which solution is...
(a) neutral? (b) strongly alkaline? (c) strongly acidic ? (d) weakly acidic? (e) weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
(a) neutral? (b) strongly alkaline? (c) strongly acidic ? (d) weakly acidic? (e) weakly alkaline?
Arrange the pH in increasing order of hydrogen-ion concentration.
Distinguish between:
Metals and non-metals on the basis of their physical properties.
Metals and non-metals on the basis of their physical properties.
Draw a diagram of an electric circuit containing a cell, a key, an ammeter, a resistor of $2 \Omega$ in series with a combination of two resistors ( $4 \Omega$ each) in parallel and a voltmeter across the parallel combination.
Will the potential difference across the $2 \Omega$ resistor be the same as that across the parallel combination of $4 \Omega$ resistors? Give the reason.
→Will the potential difference across the $2 \Omega$ resistor be the same as that across the parallel combination of $4 \Omega$ resistors? Give the reason.
Write short note: Thermal power plant
The equivalent resistance of a series combination of two resistors is $9 \Omega$ and the equivalent resistance of a parallel combination of the same two resistors is $2 \Omega$. Find the resistances of the resistors.
→How many $176 \Omega$ resistors (in parallel) are required to carry $5 A$ on a $220 \ V$ line?
→Give examples of reflex arc.
Give scientific reason:
Burning substances (fuels) burn with or without a flame.
Burning substances (fuels) burn with or without a flame.
What is meant by combination reaction? Explain it with a suitable example.