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1521. Air-pockets that cause aircrafts to lose altitude sudenly are caused by :
A. dense cloud cover
B. poor visibility
C. temperature inversions
D. intense low pressure in valley that suck in air
Explanation:
1522. If a bimetallic strip is heated, it will :
A. not bend at all
B. bend towards the metal with lower thermal expansion coeficient
C. bend towards the metal with higher thermal expanstion coefficient
D. twist itself into a helix
Explanation:
1523. Why isa cylist required to bend inwards while moving in a circular path ?
A. To keep the vehicle on the road
B. To make the centre of gravity fall within the base
C. To produce the necessary centripetal force required to keep him moving in a curved path
D. None of these
Explanation:
1524. Which of the following polymers is widely used for making bullet proof material ?
A. Polyethlene
B. Polyamides
C. Polyvinyl chloride
D. Polycarbonates
Explanation:
1525. The stars twinkle in the night because :
A. they emit light intermittently
B. the stars atmosphere absorbs light intermittently
C. the earths atmosphere absorbs light intermittently
D. the refractive index of the air in atmosphere fluctuates
Explanation:
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