Correct Answer: C. \(\frac{1}{sin\theta}\)

Explanation

Velocity ratio = \(\frac{Effort distance}{Load distance}\)

On an inclined plane, it is the inverse of \(sin\theta\) = \(\frac{1}{sin\theta}\)

Correct Answer: C. Amplitude

Correct Answer: A. water pressure on the bubbles decreases

Explanation

When a bubble is deep under water, it has both atmospheric pressure and water pressure (giving it depth), acting on it but as it rises, the water pressure decreases. At this point, the basic pressre acting on the bubble is the atmospheric pressure. Recall that pressure is inversely proportional to volume (Boyles' law), hence, the less the pressure, the more the volume.

Correct Answer: C. saturated

Explanation

A saturated vapour is one which is in a dynamic equilibrium with its own liquid.

Explanation

Advantages of flourescent tubes over filament bulbs are;

(i) They produce less heat

(ii) They last longer

(iii) They are brighter

(iv) They consume less electrical energy

Correct Answer: C. Solar cell

Explanation

The solar cell converts light from the sun to electricity.

Explanation

Let R represent the horizontal distance covered at time t.

Using h = ut + \(\frac{1}{2}gt^2\)

but U\(_v\) = 0

h = \(\frac{1}{2} gt^{2}\)

20 = \(\frac{1}{2} \times 10 \times t^2\)

20 = 5t\(^2\)

t\(^2\) = \(\frac{20}{5}\) = 4

t = 2s

Range(R) = U\(_x\) x t

= 15 x 2

= 30m

or

R = u x \(\sqrt{\frac{2h}{g}}\)

= 15 x \(\sqrt{\frac{2 \times 20}{10}}\)

= 15 x \(\sqrt{4}\)

= 15 x 2

= 30m

Correct Answer: A. latent heat

Explanation

Latent heat is thermal energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process.

Correct Answer: B. 45°

Explanation

The formula is \(\frac{v^{2}sin2\theta}{g}\)

And the sine graph is highest at 1 with its inverse as 90°. Hence, \(2\theta\) = 90°

\(\theta\) = 45°

Correct Answer: C. frequency

Explanation

The time required to complete one full cycle is the period; the inverse of the period gives the frequency.