UPSC Recruitment Paper 2016: Senior Scientific Assistant (Electrical) in Ministry of Defence

1. Inside a hollow conducting sphere the electric field

(a) changes with the distance from the centre
(b) changes with the charge given to the sphere
(c) is a non-zero constant
(d) is zero

2. The magnetic vector potential due to a single conductor carrying fixed current is

(a) Zero
(b) Infinite
(c) Definite and finite
(d) Undefined

3. In a PWM inverter the fundamental frequency is

(a) Equal to switching frequency
(b) One fifth of switching frequency
(c) Double the switching frequency
(d) Independent of switching frequency

4. A conductor carrying current towards the observer (out of plane) is under the influence of North Pole experience force in

(a) Left hand side
(b) Right hand side
(c) Upward direction
(d) Downward direction

5. A box with given dimensions encloses positive point charge ݍ . If the dimensions of the box are doubled, the flux in the box will be

(a) Four times
(b) Doubled
(c) Halved
(d) Unchanged

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Courtesy : UPSC