Quadratic Surds

Q. Which of the following is/are quadratic surds?

1. $\sqrt[2]{23}$
2. $\sqrt[3]{36}$
3. $\sqrt[4]{49}$
4. $\sqrt[5]{520}$

Q. Which of the following is not a quadratic surd?

1. $\sqrt[2]{23}$
2. ${25}^{\frac{1}{4}}$
3. $3^{\frac{1}{2}}$
4. $\sqrt[3]{32}$

Q. Which of the following are true regarding $C{O}_2$
a. Excess of $C{O}_2$ acts as a pollutant
b. Plants take in $C{O}_2$ for photosynthesis
c. Deforestation leads to decrease in the amount of $C{O}_2$ in air
d. Less quantity of $C{O}_2$ causes a rise in temperature

1. a, b and d

2. a, b and c

3. b and c

4. a and b

Q. Which of the following cannot be used as a method to reduce air pollution?

1. Using bicycle for transportation
2. Reducing the use of firecrackers
3. Planting more trees
4. Burning garbage in open

Q.

Which of the following would not be effective in reducing air pollution?

1. Solar energy

2. Use of CNG

3. All of these

4. Use of electric cars