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• # More Difficult Problems in Physics From Jamb 2011

Physics

12-02-2016 10:43:00 +0000

Hello everybody! Here are some questions that over 80% that attempted it got it wrong. Lets see if you can get it right. Try and see if you can solve these questions.

Question 12
A machine is used to lift a load of 20 N through a height of 10 m. If the efficiency of the machine is 40%, how much work is done?
Option A 300 J
Option B 120 J
Option C 80 J
Option D 500 J

Question 37
Three cells each of e.m.f 2V and internal resistance 2 ohms are connected in parallel, the total e.m.f and total resistance are respectively
Option A 2V, 6.0 ohms
Option B 6V, 0.7ohms
Option C 6V, 6.0ohms
Option D 2V, 0.7 ohms

Question 38
In homes, electrical appliances and lamps are connected in parallel because
Option A less current will be used
Option B less voltage will be used
Option C parallel connection does not heat up the wires
Option D series connection uses high voltage

• sulaiman kudu

12-D 37-B 38-B

0 12-02-2016 11:23:00 +0000

• Opeyemi Bamigbele

No 12,EFF=wek aotput/wek nput×100%.xo 40=20××10/x×100%=x=5/1×100/1=500/1=500jansa.optn D.

0 12-02-2016 12:07:00 +0000

• emmanuel olusegunota

12--D 37--B 38--B

0 12-02-2016 12:15:00 +0000

• AKOBUNDU EMMANUEL

12d 38b 37b

0 12-02-2016 13:01:00 +0000

• solanke samsideen

12-D 37-D 38-A

0 12-02-2016 14:29:00 +0000

• Precious Jacob

my ansa iz option c.80j

0 12-02-2016 21:47:00 +0000

• Precious Jacob

option c.6v,6.0 ohms

0 12-02-2016 21:51:00 +0000

• Precious Jacob

option b.

0 12-02-2016 21:53:00 +0000

• frankline samuel

12. b 37. d 38. a

0 13-02-2016 06:03:00 +0000

• frankline samuel

12.d 13.d 38.a

0 13-02-2016 06:03:00 +0000