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1316. Paper becomes brittle and yellow with age. Why ? 1. The acid content in paper causes brittleness to develop 2. In the presence of visible light, photosensitised oxidation occurs 3. The ultra-violet component of sunlight causes photolysis of cellulose by direct cleavage of the cellulose polymer
A. 1 and 2
B. 2 and 3
C. 1 and 3
D. 1, 2 and 3
Explanation:
1317. The energy of the winds and the waves is :
A. potential
B. kinetic
C. electrical
D. potential and kineitic
Explanation:
1318. Consider the following statements regarding a motor car battery : 1. The voltage is usually 12 V2. Electrolyte used is hydrochloric acid3. Electrodes are lead and copper4. Capacity is expressed in ampere - hour Which of the above statements are correct ?
A. 1 and 2
B. 2 and 3
C. 3 and 4
D. 1 and 4
Explanation:
1319. Barium in a suitable form is administered to patients before a X-ray examination of the stomach, because :
A. barium allows X-rays to pass through the stomach on account of its transparency to X-rays
B. barium compound, like magnesium sulphate helps in cleaning the stomach before X-ray examination
C. barium is a good absorber of X-rays and this helps the stomach to appear clearly in contrast with the other regions in the picture
D. barium slats are white in colour and this helps the sotmach to appear clearly in ocntrast with other regions in the picture
Explanation:
1320. The comic mirrors seen in amusement parks have reflecting surface that are :
A. entirely concave
B. irregularly curved
C. convex and spherical
D. plane at all point
Explanation:
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