686: Which of the following can be inferred from the statement that "Either John is stupid or John is lazy" ?
I. John is lazy / therefore, John is not stupid.
II. John is not lazy / therefore, John is stupid.
III. John is not stupid / therefore, John is lazy.
IV. John is stupid / therefore, John is not lazy.
Choose the correct answer from the codes given below :
Codes :
(a) I and II
(b) II and III
(c) III and IV
(d) I and IV
687: Which one of the following can be used to confirm whether drinking water contains a gamma emitting isotope or not?
(a) Microscope
(b) Lead plate
(c) Scintillation counter
(d) Spectrophotometer
688: Match the names of outstanding Indian scientists given in List I with area of their specialised work given in List II and select the correct answer using the codes given below the lists :
List I-------------------List II
I. Dr. Raja Ramanna---- (A) Plant Chemistry
II. Dr. M.S. Swaminathan------(B) Nuclear Physics
III. Prof. U.R. Rao----(C) Thermodynamics and astrophysics
IV. Prof. Meghnad Saha --------(D) Space research
---------------------(E) Agricultural sciences
Codes:
(a) I-C, II-E, III-B, IV-A
(b) I-B, II-A, III-D, IV-C
(c) I-B, II-E, III-D, IV-C
(d) I-C, II-A, III-D, IV-B
689: According to ancient Indian cosmogonic ideas the sequential order of the cycle of four aeons (Yugas) is
(a) Dvapara, Krita, Treta and Kali
(b) Krita, Dvapara, Treta and Kali
(c) Krita, Treta, Dvapara and Kali
(d) Treta, Dvapara, Kali and Krita
690: India's population growth during the 29th century can be classified into four distinct phases. Match List I (Period) with List II (Phase) and select the correct answer using the using the codes given below the lists:
List I List II
(Period) (Phase)
A. 1901-21 1. Steady growth
B. 1921-51 2. Rapid high growth
C. 1951-81 3. Stagnant growth
D. 1981-2001 4. High growth with definite signs of slowdown
Codes:
A B C D
(a) 3 1 4 2
(b) 1 3 2 4
(c) 3 1 2 4
(d) 1 3 4 2