1. What happens when a metal reacts with an acid?
Or
Name one characteristic of metals that allows it to be easily flattened into thin sheets.
2. The value of frequency and voltage of the electricity ,supplied to homes in India are
a) 50 442 3R 220 V
b) 50 - 110 V
c) 60 Hz ott 220 V
a) 60 Hz Sit 110 V
123
3. Refer the given representation of pH scale and answer the following questions -
Enc.-
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DE QURACTEDRAL
BIC CHARLIGTER INCREDERS
NEUTRAL
10
11
12
a) What would be the H2O conc. of a substance having pH of 3.
b) What would be the nature of the substance having a pH of 11.
c) Milk goes sour by lactobacillus bacteria if it's pH falls below...
4. A solar cell :
a) First converts solar energy into heat energy and then to electricity
b) First converts solar energy into light energy and then to electricity.
) Converts solar energy lito electricity
d) First converts solar energy into magnetic energy and then to electricity
Answers
1.It gives metal oxide + hydrogen
(or)
Malleability
2.a)50Hz and 220V
4.c)Converts solar energy into electrical energy
1. corresponding metal salt and water.
malleability
2. 50 hertz and 230 volts.
3. a) 
gram equivalents per liter
b) Basic nature
c) pH of milk falls below 7 for it to curdify
4.a) First converts solar energy into heat energy and then to electricity
Explanation:
1.
When metal reacts with an acid we get the corresponding metal salt and water.
The property of any metal to be flattened into thin sheets is called malleability.
2.
India has a standard domestic electricity supply of 50 hertz and 230 volts.
3.
On a pH scale 7 represents neutral, more than 7 is basic nature and less than 7 is acidic nature.
a) gram equivalents per liter
b) Basic nature
c) pH of milk falls below 7 for it to curdify
4.
a) First converts solar energy into heat energy and then to electricity by the phenomena of photo-voltaic emission of electrons.
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TOPIC: solar cell, pH scale, acids
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