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Singular verb must be used when one singular and one plural subject is joined by ‘nor’ or ‘or’.
When the word ‘and’ is used to join two or more singular nouns or pronouns, the verb should be in singular form.
Consider the following assertions: I. Rank (ST) = Rank S = Rank T II. Rank (ST) = Rank S, if T is non-singular III. Rank (ST) = Rank T, if T is non-singular Where S, T : V → V are linear transformations of a finite dimensional vector space V. Which of these is/are correct?
Consider the following statements: 1. If A′ = A; then A is a singular matrix, where A′ is the transpose of A. 2. If A is a square matrix such that A3 = I, then A is non-singular. Which of the statements given above is/are correct ?
If two singular nouns refer to the same person or thing, the verb must be singular.
The pronoun must be in singular when a singular noun and a plural noun are joined by ‘or’ or ‘nor’
What will be the product of any two prime numbers except the smallest prime number? A. Always zero B. Always one C. Always an even number D. Always an odd number
Which combination of the following statements is correct? The incorporation of reheater in a steam power plant: P: always increases the thermal efficiency of the plant. Q: always increases the dryness fraction of steam at condenser inlet. R:  always increases the mean temperature of heat addition. S:  always increases the specific work output.
Which one is always used as singular?
Which one is always used as singular ?