Question
In the following sentences, a part of the sentence is
given in bold. Choose the best alternative that improves the sentence grammatically and contextually. If no improvement is required, choose option (D). The rapid advancement of artificial intelligence has enabled machines to perform complex cognitive tasks, raising concerns that whether such systems could eventually replace human judgment in critical domains.Solution
Error in original: “concerns that whether” → double conjunction error Correct patterns: concerns that… concerns about whether… Now check options: A → missing preposition “about” → incomplete B → removes “whether” → slightly changes meaning C → correct: concerns about whether… D → incorrect  Hence, C is correct.
Which of the following G-protein takes part in the regulation of vision?
The centre of gravity of a sprinter during the race lies –
Which of the following is the hardest substance known?
Which one of the following is responsible for nuclear fission?
The force which opposes the relative motion between different layers of liquid or gases is called –
A 50 kg object is lifted to a height of 10 meters. What is its potential energy at that height? (Take g = 9.8 m/s ² )
If cream is removed from milk, its density –
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If two bodies of different masses, initially at rest, are acted upon by the same force for the same time, then the both bodies acquire the same -
The period of revolution of a geo- stationary satellite is –