Thermal energy added or removed from a substance that changes the state of the substance is called
latent heat
heat of reaction
calorimetry
specific heat
Correct answer is A
Latent heat is thermal energy released or absorbed, by a body or a thermodynamic system, during a constant-temperature process.
25%
36%
64%
75%
Correct answer is D
No explanation has been provided for this answer.
Which of the following devices converts light energy to electrical energy?
Bulb
Television
Solar cell
Light emitting diode (LED)
Correct answer is C
The solar cell converts light from the sun to electricity.
water pressure on the bubbles decreases
density of water increases with rise in temperature
volume of water increases with rise in temperature
atmospheric pressure on the bubbles decreases
Correct answer is A
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
A plane is inclined at an angle \(\theta\) to the horizontal. Its velocity ratio is
\(sin\theta\)
\(tan\theta\)
\(\frac{1}{sin\theta}\)
\(\frac{1}{tan\theta}\)
Correct answer is C
Velocity ratio = \(\frac{Effort distance}{Load distance}\)
On an inclined plane, it is the inverse of \(sin\theta\) = \(\frac{1}{sin\theta}\)
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