1. -ve to +ve and remains +ve
2. -ve to +ve and then to -ve
3. +ve to -ve and then remains -ve
4. +ve to -ve and then to +ve
-ve to +ve and then to -ve
1. Both assertion and reason are true and reason is the correct explanation of assertion
2. Both assertion and reason are true and reason is not the correct explanation of assertion
3. Assertion is true but reason in false
4. Both assertion and reason are false
Both assertion and reason are false
1. Ozone layer depletion
2. Green house effect
3. Water pollution
4. Conservation of wildlife
Green house effect
1. rheobase or threshold current
2. spike
3. action potential
4. None of the above
rheobase or threshold current
1. CO2
2. Ne
3. SO2
4. NO2
CO2
1. Qualitative pollutants
2. Degradable pollutants
3. Primary pollutants
4. Quantitative pollutants
Quantitative pollutants
1. Microorganisms
2. Food crop
3. Green vegetation
4. Herbivores
Green vegetation
1. To mitigate climate changes
2. Limit production of chlorofluorocarbons
3. To prepare a world climate programme
4. None of the above
To mitigate climate changes
1. SO2,NO3
2. CFCs,CH4,N2O
3. CO,CH4,O2
4. NO2,CO2
CFCs,CH4,N2O
1. 75 dB
2. 55 dB
3. 65 dB
4. 45 dB
55 dB