```       (c) increases heavily
(d) varies continuously
Ans : (c)
319. Transformers are used in between the electric power stations and homes or factories in order to [Asstt Commdt 2011]
(a) minimize the power loss in transmission cables
(b) minimize the voltage drop in transmission cables
(c) minimize the current drop in the transmission cables
(d) provide constant voltage at the user end
Ans : (d)
320. The acceleration due to gravity on the surface of the Earth is maximum and it [Asstt Commdt 2011]
(a) increases as we go up
(b) decreases as we go up or down
(c) increases as we go down
(d) neither increases nor decreases as we go up or down
Ans : (b)
321. "Hydraulic brakes" and "Hydraulic lift" are devices in which fluids are used for transmitting [Asstt Commdt 2011]
(a) force
(b) momentum
(c) pressure
(d) power
Ans : (c)
322. Tsunami causes devastation near the coast of the sea as the speed of the sonic waves generated at the epicentre is [Asstt Commdt
2011]
(a) directly proportional to the depth of the sea
(b) inversely proportional to the depth of the sea
(c) directly proportional to the distance between the coast and epicentre
(d) inversely proportional to the distance between the coast and epicenter
Ans : (b)
323. One can distinguish a telescope from a microscope by observing [CPO SI 2011]
(a) length
(b) colour
(c) size of the lens
(d) length and size of the lens
Ans : (c)
324. The sound produced by a bat is [CPO SI 2011]
(a) audible
(b) subsonic
(c) infrasonic
(d) ultrasonic
Ans : (d)
325. When a bar magnet is cut into two equal halves, the pole strength of each piece [CPO SI 2011]
(a) becomes double
(b) becomes half
(c) becomes zero
253
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