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In option B past tense is used while sentence is in present tense.
In option C singular form of noun is used while in sentence plural form is required.
In option D Asia word is used in place of world.
What is the power of a lens whose focal length is 1 m?
What device is primarily used to convert alternating current (AC) into direct current (DC)?
If input frequency of a full wave rectifier be n, then output frequency would be-
A bus moving along a circular track is an example of
Velocity of the sound is minimum in-
Which of the following is the time taken for one complete oscillation of a sound wave in the density of the medium?
Foucault Experiment is the proof of
How much calorie of energy is released by a boiled egg?
The important unit of a microprocessor is –
What is the cause of hypermetropia?