Question

21. What is pres byopia/ What is the main reason for this defect.
12. 2a of electric current is passed through bulb for 5 minutes calculate the amount of electric charges flowing through the bulb.

Answer 1

21 ) Presbyopia is a defect of eye vision due to which an old person cannot see the nearby objects clearly . The main reason for presbyopia is loss of power of accommodation of eye.

12) current = 2A

time = 5hrs. = 5 × 60 × 60 sec

=5 × 3600 sec

= 18000sec

We know that ,

I = q / t

2= q/ 18000

q= 2 × 18000

q= 36000 C

Answer 2

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