Assertion (A) : Tiny air molecules scatter blue light more than red light.

Reason (R) : The refractive index of a medium is greater for blue light than red light.

1. (A) is true but (R) is false.
2. (A) is false but (R) is true.
3. Both (A) and (R) are true and (R) is correct explanation of (A).
4. Both (A) and (R) are true and (R) is not the correct explanation of (A).

In the circuit given below, identify the lamp (L₁, L₂, L₃ and L₄) whose failure would not interrupt the power supply to the other lamps.

1. L₁
2. L₂
3. L₃
4. L₄

A metallic wire is stretched in such a way that its new length becomes twice the original length. How does its specific heat capacity change?

1. becomes double
2. becomes 4 times
3. becomes 1⁄4 times
4. remains the same

The correct formula to calculate the equivalent resistance of two resistors R₁ and R₂ when connected in parallel, is:

1. $\dfrac{\text R$1 + \text R2}{\text R1\text R2} \\[1em]
2. $\dfrac{\text R$1\text R2}{\text R1 + \text R2} \\[1em]
3. $\dfrac{\text R$1 - \text R2}{\text R1\text R2} \\[1em]
4. $\dfrac{\text R$1\text R2}{\text R1 - \text R2} \\[1em]