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1446. Which of the following alloys is used for making magnets ?
A. duralumin
B. Stainless steel
C. Alnico
D. Magnalium
Explanation:
1447. Heads of safety matches contain which of the following ? 1. Sulphur 2. Potassium chlorate 3. Red phosphorus 4. Antimony trisulphide
A. 1, 2 and 3
B. 2, 3 and 4
C. 1, 2 and 4
D. 1, 2, 3 and 4
Explanation:
1448. Which falls down faster in a vacuum - a feather, a wooden ball or a steel ball ?
A. A wooden ball
B. A feather
C. A steel ball
D. All will fall down at the same speed in a vaccum because there will be no air resistance.
Explanation:
1449. What is the number of basic units in the International System of Units ?
A. 4
B. 5
C. 6
D. 7
Explanation:
1450. Super conductivity results when matter is :
A. heated to very high temperature
B. compressed to very high pressure
C. subjected to very low pressure
D. cooled to very low temperature
Explanation:
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