Which among the following is a vector quantity?

1. work
2. power
3. energy
4. moment of couple

What is the correct energy transformation during burning of a candle?

1. heat → kinetic + potential
2. heat → chemical + light
3. chemical → heat + light
4. mechanical → chemical + heat

Which one of the following combinations is the correct ascending order of electromagnetic waves in terms of wavelength?

1. Gamma-rays, visible light, microwaves
2. Microwaves, visible light, gamma-rays
3. Gamma-rays, microwaves, visible light
4. Microwaves, gamma-rays, visible light

For a lever, a graph is plotted with load on Y-axis and effort on X-axis. Which of the following represents the slope of the graph?

1. Mechanical advantage
2. Velocity ratio
3. $\dfrac{1}{\text {Velocity ratio}}$
4. $\dfrac{1}{\text {Mechanical advantage}}$