Deck 2: Electrical and Physics Concepts

Question 1

In transformer, alternating current is induced in

A)primary coil
B)secondary coil
C)iron core
D)resistor

Answer 1

secondary coil

Question 2

High voltages lead to

A)less power loss
B)more power loss
C)high current
D)high resistance

Answer 2

less power loss

Question 3

Graph of alternating current is a

A)cos wave
B)tan wave
C)curve
D)sine wave

Answer 3

sine wave

Question 4

A component that allows only unidirectional current to pass through it is

A)resistor
B)inductor
C)transformer
D)diode

Question 5

Average power dissipated in resistor if sinusoidal p.d of peak value 25V is connected across a 20 Ω resistor is

A)15.6 W
B)15 W
C)16 W
D)17 W

Question 6

Amount of d.c voltage as compare to Vo is

A)50%
B)60%
C)70%
D)80%

Question 7

A well designed transformer loses power under

A)10%
B)1.20%
C)0.1%
D)20%

Question 8

Ratio of voltages is equal to ratio of

A)iron sheets in core
B)coil
C)number of turns in coil
D)all of above

Question 9

Process in which A.C is converted into D.C is called

A)induction
B)rectification
C)inversion
D)dispersion

Question 10

Steady d.c voltage is also known as

A)square velocity
B)root mean square velocity
C)root velocity
D)velocity

Question 11

Ratio of voltages is inverse ratio of the

A)transformer
B)resistor
C)iron core
D)current

Question 12

If output voltage is greater than input voltage, then transformer is

A)step up
B)step down
C)faulty
D)fatal

Question 13

Highest point on AC graph is known as

A)peak value
B)amplitude
C)frequency
D)wave front

Question 14

Kinetic friction is always

A)lesser than static friction
B)greater than static friction
C)equal to static friction
D)equal to contact force

Question 15

Gravitational potential is always

A)positive
B)negative
C)zero
D)infinity

Question 16

In order to keep a body moving in a circle, there exists a force on it that is directed toward the center of the circle. This force is known as

A)Centrifugal force
B)Centripetal force
C)Gravitational Force
D)magnetic force

Question 17

A rectangle-shaped open-to-sky tank of water has a length of 2 m and a width of 1 m. If the atmospheric pressure is assumed to be 100 kPa and thickness of the tank walls is assumed to be negligible, the force exerted by the atmosphere on the surface of water is

A)20 kN
B)50 kN
C)100 kN
D)200 kN

Question 18

If we have a positive and a negative charge, then force between them is

A)positive
B)negative
C)zero
D)infinite

Question 19

Electrical force exerted by two point charges on each other is inversely proportional to

A)sum of their charges
B)product of their charges
C)distance between them
D)square of distance between them

Question 20

Unit for pressure used in weather maps is millibar. 1 millibar is equal to

A)1000 bar
B)100 kPa
C)100 Pa
D)1 atm

Question 21

If charge is placed at infinity, it's potential is

A)zero
B)infinite
C)1
D)-1

Question 22

Most appropriate instrument for measurement of internal and external diameter of a tube is

A)vernier callipers
B)micrometer screw gauge
C)meter rule
D)measuring tape

Question 23

When distance from center is doubled then electric field strength will

A)decrease by the factor of four
B)increase by factor of four
C)will be same
D)decrease by factor of two