3956: Consider the following statements about acetylene :
I. It is used in welding industry.
II. It is raw material for preparing plastics.
III. It is easily obtained by mixing silicon carbide and water.
Of these statements :
(a) I and II are correct
(b) I and III are correct
(c) II and III are correct
(d) I, II and III are correct
3957: Consider the following statements:
1. The common blue green algae Spirogyra and Ulothrix are found in both fresh water ponds and oceans.
2. The chameleon can look ahead with one eye, and at the same time look behind with another.
Which of these statements is/are correct?
(a) Only 1
(b) Only 2
(c) Both 1 and 2
(d) Neither 1 nor 2
3958: The principal cause of soil damage in Punjab and Haryana is:
(a) Salinity and water-logging
(b) Deforestation
(c) Ravine erosion
(d) Overgrazing
3959: Assertion (A) :
Ganga Plain is the most densely-populated part of India.
Reason (R) :
Ganga is the most harnessed river of India.
(a) Both A and R are true, and R is the correct explanation of A
(b) Both A and R are true, but R is not a correct explanation of A
(c) A is true, but R is false
(d) A is false, but R is true
3960: In the series
AABABCABCDABCDE........
which letter occupies the 100th position?
(a) I
(b) K
(c) H
(d) J