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1341. The nuclides having the same number of neutrons but different number of protons or mass number are known as :
A. isobars
B. isoelectronic
C. isotopes
D. isotones
Explanation:
1342. Phenomenon of formation of three dimensional image by interference of two light beams from laser or other coherent sources of light is called :
A. Optical photography
B. X-ray photography
C. Radiography
D. Holography
Explanation:
1343. Water is neither acidic nor alkaline because :
A. it cannot accept or donate protons
B. it boils at a high temperature
C. it can dissociate into equal number of hydrogen ions
D. it cannot donate or accept electrons
Explanation:
1344. A bomb is dropped at a point from a moving aeroplane. The pilot observes that :
A. the bomb traverses a curved path and falls some distance behind that point
B. the bomb traverses a curved path and falls some distance ahead
C. the bomb drops vertically dwonward
D. the bomb remains stationary in the air for some time
Explanation:
1345. Arrange the following discoverire in chronological order : 1. Radium 2. Oxygen3. Deuterium 4. Laser
A. 1, 2, 3, 4
B. 4, 3, 2, 1
C. 3, 2, 1, 4
D. 2, 1, 3, 4
Explanation:
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