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has been will come in place of have been; as, here we are talking about one spectrum including all the fields and not the fields individually so we will be using HAS(second or third person singular) in place of HAVE.(plural)
The instrument for measuring intensity of earthquakes is called –
UNO was established on?
Which of the following statements about X-rays is INCORRECT ?
Electrical fuse is used to interrupt excess of _________.
The method of transfer of heat in liquid is
A simple microscope consists of :
What Type of Mirror Is Commonly Used as Rear-View Mirrors in Vehicles?
A bus moving along a circular track is an example of
Which of the following types of waves has the smallest wavelength?
Vivek was walking in the park. On the way he found a stone lying. He picked the stone and threw it up in the sky. After few seconds, he observed that th...