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as the whole sentence is in past so no verb of present or future can be used here, by this easily can get the correct answer.
Ratio of intensities of two waves with amplitudes 2 and 3 is:
What is the unit of electric current?
Why does a fountain pen leak on an airplane flying at high altitude?
How does the angle of minimum deviation of a glass prism of refractive index 1.5 change, if it is immersed in a liquid of refractive index 1.25?
If the velocity-time graph of an object is a straight line inclined at an angle to the time axis, then:
A negative test charge is released in a non-uniform electric field. It moves towards a region of:
Which of the following waves require a medium to travel?