CAT Questions

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3X + 4y = 240
by substitute through options 48 is correct

Because the refractive index of glass is highest, light travels slowly in Glass. 

We know that the speed of light depends on the refraction index. The higher the index of refraction is, the slower the speed of light is.

R.I of air and vacuum = 0 (air is a teeny bit more but can be taken as 0)
R.I of water = 1.33
R.I of glass = 1.4.

Hence, Light travels slowest in Glass.

In networking, the Open Systems Interconnection is commonly called as OSI model. It has a 7 layer architecture for the communication.

In OSI network architecture, the routing is performed by network layer which is layer number 3 with the help of intermediate routers.

Quality of transmission is governed both by nature of signal and nature of communication channel/medium.

The rupee is the currency of India. Similarly, Yen is the currency of Japan.

Hence, Rupee : Indian :: Yen : Japan.