The pair of musical instruments that works on the vibration of air in pipes is
piano and the organ
guitar and the flute
trumpet and the violin
flute and the trumpet
Correct answer is D
No explanation has been provided for this answer.
\(\frac{V}{L}\)
\(\frac{5VL}{2}\)
\(\frac{5L}{4V}\)
\(\frac{5V}{4L}\)
Correct answer is D
L = \(\frac{5\lambda}{4}\)
\(\lambda = \frac{4L}{5}\)
But \(\lambda = f\lambda\)
f = \(\frac{v}{\lambda} = \frac{v}{\frac{4L}{5}}\)
= \(\frac{5v}{4L}\)
Complementary colours are those which
have the same refractive index
have the same wavelength
add-up to produce black light
add-up to produce white light
Correct answer is D
No explanation has been provided for this answer.
i and ii only
i and iii only
i, ii and iii only
i, iii and iv only
Correct answer is B
No explanation has been provided for this answer.
The bowed shape of the Production possibilities curve illustrates _________
That production is inefficient
That demand is relatively inelastic
That production is unattainable
The law of increasing marginal cost
Correct answer is A
Production possibility curve (PPC) shows the possible combination of different commodities that can be produced in a given economy given the prevailing level of technology, if all the available productive resources are efficiently utilised.
The reason for the shape of the PPC is something called the law of increasing opportunity costs. Basically, what this means is that as an economy devotes more of its resources to one kind of product, it becomes less efficient because, not all resources are equally suitable for all the industries. If resources are transferred from good A to B, initially the resources to be transferred will be those which could be the least efficient for A. Later, as more of good B needs to be produced, the resources that may be very efficient for good B and not so efficient for good B may also be transferred. In this situation, the economy loses on both sides. That means, the economy is usually inefficient on both ends of the PPC curve while it is the most efficient when resources are appropriately allocated for both goods according to their suitability which make the PPC to be curved. This is why the PPC is flatter at its end point and more curved in the middle.
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