4141: There are 6 different letters and 6 correspondingly addressed envelopes. If the letters are randomly put in the envelopes, what is the probability that exactly 5 letters go into the correctly addressed envelopes?
(a) Zero
(b) 1/2
(c) 1/6
(d) 5/6
4142: In a tournament each of the participants was to play one match against each of the other participants. 3 players fell ill after each of them had played three matches and had to leave the tournament. What was the total number of participants at the beginning, if the total number of matches played was 75 ?
(A) 12
(B) 10
(C) 8
(D) 15
4143: Which of the following is not included in the list of Fundamental Duties in the Constitution?
(a) To safeguard public property and to abjure violence
(b) To uphold and protect the sovereignty, unity and integrity of India
(c) Secularism
(d) To abide by the Constitution and respect its ideals
4144: If there were no organic life on the Earth, the amount of oxygen in the atmosphere will:
(a) Remain unchanged.
(b) Be approximately hundred per cent.
(c) Be almost nil.
(d) Be approximately fifty per cent.
4145: If a block of gold weighing 100 gm in air is immersed in water with a string tied to a spring balance, what could be the probable weight indicated by the spring balance?
(a) Less than 100 gm
(b) Equal to 100 gm
(c) More than 100 gm
(d) Double of 100 gm