Jamb 2017 Flashcards
(13 cards)
Why do soldiers march disorderly while crossing a bridge?
To prevent resonance on the bridge
Under which of the following conditions is workdone
A. A man supports a heavy food above his head with his hands
B. A boy climbs onto a table
C. A man pushes unto a table
D. A woman holds a pot of water
B
What is the function of a compressor?
Compressor is an instrument to supply air or other gas at increased pressure
What is the function of a refrigerator?
Refrigerator is an appliance to keep things cold
What is the function of a air blower?
Air blower is used to release air
Which instruments helps to maintain the correct humidity and temperature of a building?
Air conditioner
Formula for magnification in pinhole camera
M = length of camera/distance of object from pinhole
Which of the operations can be used to convert an alternative current dynamo into a direct current dynamo
Replace slip rings with split rings commutator
What is the difference between barometer and manometer?
Barometer measures atmospheric pressure while manometer measure pressure of gases
How can energy loss be minimized through Eddy-current
By using high resistance wire
Which of the following is correct about an electric cell?
A. Primary cell produces a large current for a long time
B. Secondary cell has a very high internal resistance
C. Primary cell has a very low internal resistance
D. Secondary cell has a very low internal resistanc
D
The action of blotting paper on ink is due to
Capillarity
What happens when silicon is doped with a penta or tri valent atom
When silicon is doped with a trivalent atom. A p-type semi-conductor will be formed when silicon is doped with a pentavalent atom such as arsenic, a n-type semi-conductor will be formed
Phosphorous is a pentavalent element, so it will produce a o -type semi-conductor
