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1456. The picture tube of a black and white T.V. set has only one electron gun that produces the picture on its screen. The number of electron guns, a colour picture tube has, is :
A. five
B. three
C. four
D. six
Explanation:
1457. Soduim thiosulphate is used in photography because :
A. it is an oxidising agent
B. it is a reducing agent
C. it reacts with light
D. it helps in fixing the photograph
Explanation:
1458. In an engine run on idesel, ignition is caused through
A. friction
B. automatic starter
C. spark plug
D. compression
Explanation:
1459. A bubble of water shines because of :
A. reflection
B. refraction
C. total internal reflection
D. none of these
Explanation:
1460. One of the youngest sciences of the 20th century which deals with production, control and application of very low temperature is called :
A. Cryptography
B. Crystallograhy
C. Cryogenics
D. Acarology
Explanation:
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