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1491. Photosynthesis is
A. an exothermic process
B. an endothermic process
C. a neutral process
D. a themostatic process
Explanation:
1492. The temperature of a body is an indicator of :
A. the total energy of the molecules of the body
B. the average energy of the molecules of the body
C. the total velocity of the molecules of the body
D. the average kinetic energy of the molecules of the body
Explanation:
1493. Food is cooked faster in a pressure cooker because :
A. high pressure increases the boiling point of water
B. heat cannot escape from the cooker
C. steam is hotter than boiling water
D. water starts boiling at a lower temperature
Explanation:
1494. When a vehicle passes, TV reception gets distorted. This is because :
A. metal reflects radiowaves
B. spark plug creates electromagnetic disturbances
C. passing vehicle affects the sophisticated TV components
D. modern vehicles use electronic ignition system
Explanation:
1495. The pH water at 25 degree C is 7. When it is heated to 100 degree C is 7. When it is heated to 100 degree C, the pH of water :
A. increases
B. remains same
C. decreases
D. decreases upto 50 degree C and then it increases
Explanation:
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