1. My grandfather owns / fifty acre / of wet land
a) My grandfather owns
b) fifty acre
c) of wet land
d) No error
Explanation: Change, fifty acre → fifty acres.
2. Our history can be seen / as a long evolutionary dialectical development / in which there have been / a painstaking forgiving of rational and moral self.
a) Our history can be seen
b) as a long evolutionary dialectical development
c) in which there have been
d) No error
Explanation: Change, in which there have been → in which there has been.
3. Our knowledge of history does not come to / Our help and some times we / even fail to remember / who invented America.
a) Our knowledge of history does not come to
b) Our help and some times we
c) even fail to remember
d) who invented America
Explanation: who discovered America
4. The Committee has made / significant changes in / the rules which / will help to banks.
a) The Committee has made
b) significant change in
c) will help to banks
d) No error
Explanation: Help is a transitive verb. So, it should have an object. Here, TO doesn't require as help is transitive. Therefore, to should be replaced by The. Correct Sentence: The Committee has made significant changes in the rules which will help the banks.
5. This Project which is funded / by the united nations / has helped over four / lakh Indians overcome poverty.
a) This Project which is funded
b) by the united nations
c) lakh Indians overcome poverty
d) No Error
Explanation: lakh Indians to overcome poverty
6. Ramu is the elected leader / and also a person / who we all / can confide in.
a) Ramu is the elected leader
b) and also a person
c) who we all
d) No Error
Explanation: Sentence is correct.
7. The gambling stall / was a grand success / because almost everyone / tried their luck.
a) was a grand success
b) because almost everyone
c) tired their luck
d) No error
Explanation: Substitute, their → his/her
EVERYONE is a singular subject and must, therefore, be followed by singular pronoun.
8. Little water / that was left / in the bottle was not enough / to quench the thirst of two persons.
a) that was left
b) Little water
c) in the bottle was not enough
d) No error
Explanation: Sentence is correct.
9. The father / as well as the sons were / mysteriously missing / from the house.
a) The father
b) as well as the sons were
c) mysteriously missing
d) No Error
Explanation: Change, were into was
When two subjects are joined by as well as the verb agrees with the first subject. Above in the question the firs subject is The Father which is a singular so we need to use first firm of the verb which is 'was' instead of 'were'.
10. Every man, woman and child / is now aware / of the terrible consequences of / habit of smoking.
a) is now aware
b) of the terrible consequences of
c) habit of smoking
d) No Error
Explanation: Change, habit → the habit
Since, habit here has been particularized, i.e, the habit of smoking.