Practice Test 3 – ePrepare Academy

Physics Practice

Electrostatic Practice Test 3 (ORG)

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Name

1 / 40

1. The electric field required to keep a water drop of mass m just to remain suspended, when charged with one electron is

A) em/g

B) mg/e

C) emg

D) mg

2 / 40

2. The capacitors of capacitance 4 μF and 6 μF are connected in series. A potential difference of500 volt is applied to the outer plates of two capacitor system. Then the charge on each plate of each capacitor is numerically

A) 6000 μC

B) 1200 μC

C) l2000 μC

D) 60000 μC

3 / 40

3. When we touch the terminal of a high voltage capacitor, even after a high voltage has been cut off. Then the capacitor has the tendency to

A) affect dangerously

B) discharge energy

C) restore energy

D) both (a) and (b)

4 / 40

4. he study of the effect associated with electric field at rest is known as

A) electrostatics

B) electromagnetism

C) magneto static

D) none of these

5 / 40

5. Three capacitors of 2.0, 3.0. and 6.0 μF connected in series to a 10 V source. The charge on 3.0 μ F capacitor is

A) 15μC

B) 12μC

C) 5 μ C

D) 10 μ C

6 / 40

Two charges of Q coulombs are a distance d apart from each other. Which of the following would reduce the force exerted between the charges by a factor of 4?

A) Decrease the each charge Q by a factor of four.

B) Increase distance D by a factor of 4.

C) Increase distance D by a factor of two.

D) Decrease distance D by a factor of two.

7 / 40

Which of the following is not true regarding electric potential?

A) The positive terminal of a battery has higher electric potential than the negative terminal

B) Electric potential can be expressed with units of Volts or Joules per Coulomb

C) A negative charge moving from low potential to high potential will accelerate

D) When a positive charge moves from a region of low potential to high potential, the electric field does positive work on the charge

E) All of these are true statements

8 / 40

If the electrical potential energy between two equal charges quadruples, describe the change in the distance between the particles.

A) The distance was halved

B) The distance was not changed

C) The distance was quadrupled

D) The distance was quartered

9 / 40

9. The potential taken between two points across a resistor will be

A) Positive

B) Negative

C) Infinity

D) Zero

10 / 40

10. A capacitor consists of_________

A) Two conductors

B) Two semiconductors

C) Two dielectrics

D) Two insulators

11 / 40

11. For very low frequencies, capacitor acts as ________

A) Open circuit

B) Short circuit

C) Amplifier

D) Rectifier

12 / 40

12. For high frequencies, capacitor acts as _________

A) Open circuit

B) Short circuit

C) Amplifier

D) Amplifier

13 / 40

13. If 2V is supplied to a 3F capacitor, calculate the charge stored in the capacitor.

A) 1.5C

B) 6C

C) 3C

D) 3C

14 / 40

14. What is the relation between current and voltage in a capacitor?

A) I=1/C*∫Vdt)

B) I=CdV/dt

C) I=1/CdV/dt

D) I=Ct

15 / 40

15. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of charging current.

A) 10A

B) 0A

C) Infinity

D) 20A

16 / 40

16. What happens to the capacitor when the capacitor voltage is equal to the source voltage?

A) The charging phase of the capacitor is over

B) The discharging phase of the capacitor is over

C) The capacitor is switched off

D) The capacitor is switched on

17 / 40

17. When will be capacitors fully charged?

A) When voltage is zero

B) When the supply voltage is equal to the capacitor voltage

C) When voltage is infinity

D) When capacitor voltage is equal to half the supply voltage

18 / 40

18. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the final value of the discharge current.

A) 10A

B) 0A

C) Infinity

D) 20A

19 / 40

19. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of the discharge current.

A) 10A

B) 0A

C) Infinity

D) 20A

20 / 40

20. Two point charges +4 mC and -1 mC are separated by a distance of d. The ratio of force acting on them will be

A) 4:1

B) 1:4

C) 2:1

D) 1:1

21 / 40

21. A capacitor is charged to a voltage of 400V and has a resistance of 20ohm. Calculate the initial value of charging current.

A) 10A

B) 0A

C) Infinity

D) 20A

22 / 40

22. What is the final current while charging a capacitor?

A) High

B) Zero

C) Infinity

D) Low

23 / 40

23. What is the initial current while charging a capacitor?

A) High

B) Low

C) 0

D) Cannot be determined

24 / 40

24. Which of the following depends on charging and discharging rate of a capacitor?

A) Time constant

B) Current

C) Power

D) Voltage

25 / 40

25. a point charge Q_{1 =}-9 microcoloumbis at x=0 while Q₂=4microcoloumbis at x=1m . at what point would the net force on a positive charge Q_{3 be 0?}

A) 3m

B) 6m

C) 7m

D) 9m

26 / 40

26. To obtain 3 mF capacity from three capacitors of 2 mF each,
they will be arranged.

A) all the three in series

B) all the three in parallel

C) two capacitors in series and the third in parallel with the combinatioin of first two

D) two capacitors in parallel and the third in series with the combinatioin of first two

27 / 40

27. What is the total capacitance when two capacitors C1 and C2 are connected in series?

A) (C1+C2)/C1C2

B) 1/C1+1/C2

C) C1C2/(C1+C2)

D) C1+C2

28 / 40

28. In a charged capacitor, the energy resides

A) in the positive charges

B) in both the positive and negative charges

C) in the field between the plates.

D) around the edges of the capacitor plates

29 / 40

29. The potential gradient at which the dielectric of a condenser just gets punctured is called

A) dielectric constant

B) dielectric strength

C) dielectric resistance

D) dielectric number

30 / 40

30. A sheet of aluminium foil of negligible thickness is introduced between the plates of a capacitor. The capacitance of the capacitor

A) decreases

B) remains unchanged

C) becomes infinite

D) increases

31 / 40

31. The work done in placing a charge of 8 × 10^–18 coulomb on
a condenser of capacity 100 micro-farad is

A) 3.1 × 10^–26 joule

B) 4 × 10–^10 joule

C) 32 × 10^–32 joule

D) 16 × 10^–232 joule

32 / 40

32. Capacitors are used in electrical circuits where appliances
need more

A) voltage

B) current

C) resistance

D) power

33 / 40

33. The energy stored in a condenser of capacity C which
has been raised to a potential V is given by

A) = 1/2 CV

B) = 1/2 CV^2

C) u = CV

D) none

34 / 40

34. A conductor carries a certain charge. When it is connected
to another uncharged conductor of finite capacity, then the
energy of the combined system is

A) more than that of the first conductor

B) less than that of the first conductor

C) equal to that of the first conductor

D) uncertain

35 / 40

35. When air in a capacitor is replaced by a medium of
dielectric constant K, the capacity

A) decreases K times

B) increases K times

C) increases K^2 times

D) remains constant

36 / 40

36. If in a parallel plate capacitor, which is connected to a battery,
we fill dielectrics in whole space of its plates, then which of
the following increases?

A) Q and V

B) V and E

C) E and C

D) Q and C

37 / 40

37. Energy is stored in a capacitor in the form of

A) electrostatic energy

B) magnetic energy

C) light energy

D) heat energy

38 / 40

38. On decreasing the distance between the plates of a parallel
plate capacitor, its capacitance

A) remains unaffected

B) decreases

C) first increases then decreases

D) increases

39 / 40

39. If a unit positive charge is taken from one point to another
over an equipotential surface, then

A) work is done on the charge

B) work is done by the charge

C) work done is constant

D) no work is done

40 / 40

40. Which of the following about potential difference between
any two points is true?
I. It depends only on the initial and final position.
II. It is the work done per unit positive charge in moving
from one point to other.
III. It is more for a positive charge of two units as compared
to a positive charge of one unit

A) I only

B) II only

C) I and II

D) I, II and III

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The average score is 79%

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Pos.	Name	Duration	Points
1	Barakna Zia	1 minutes 58 seconds	40
2	Hilal Riffat	4 minutes 5 seconds	40
3	Nabiha Saeed	15 minutes 43 seconds	40
4	Mudasir Rafiq	18 minutes 9 seconds	40
5	Marwa Arshad Afridi	46 minutes 54 seconds	40
6	Ahmad khan	56 minutes 28 seconds	40
7	Mehrunisah	3 minutes	39
8	....	6 minutes 6 seconds	39
9	Ayesha Bibi	6 minutes 38 seconds	39
10	a ahmed	17 minutes 31 seconds	39
11	Sayeda Muqaddas Miftah	20 minutes 7 seconds	39
12	Sofia Talat	22 minutes 22 seconds	39
13	SHEHLA NOOR	59 minutes 56 seconds	39
14	Laiba	1 hours 6 minutes 54 seconds	39
15	Anum khan	13 minutes 53 seconds	38
16	Muhammad Adnan	30 minutes 9 seconds	38
17	Dua Aleem	11 minutes	36
18	Aasia ikram	14 minutes 28 seconds	35
19	kashif	27 minutes 10 seconds	35
20	mahzaib Gul	5 minutes 42 seconds	34
21	Muhammad zakir	22 minutes 47 seconds	34
22	Muhammad Saad	25 minutes 46 seconds	34
23	Zainab Shaffi	28 minutes 7 seconds	34
24	Eqan Ahmad	1 hours 2 minutes 7 seconds	34
25	Azra bibi	43 minutes 23 seconds	33
26	Shehzad Khan	1 hours 9 minutes 32 seconds	31
27	Fatima	2 hours 21 minutes 21 seconds	31
28	Hina saeed	19 minutes 46 seconds	30
29	shahid ali	28 minutes 5 seconds	30
30	Dua	36 minutes 37 seconds	30
31	Muhammad Izhar	39 minutes 52 seconds	30
32	Dr. Dilan	43 minutes 1 seconds	29
33	Laiba Raza	1 hours 18 minutes 34 seconds	29
34	Muhammad Sharjeel Raza	30 minutes 11 seconds	28
35	Yahya khan	1 hours 8 minutes 33 seconds	28
36	MARIA SAEED	23 minutes 16 seconds	27
37	SAADi	26 minutes 52 seconds	27
38	Akbar Siddique	16 minutes 7 seconds	26
39	Romesa Maqsood	29 minutes 3 seconds	26
40	Laik	54 minutes 26 seconds	26
41	Maryam Batool	43 minutes 54 seconds	25
42	Muhammad Hamid	1 hours 6 minutes 37 seconds	25
43	Wasim ullah	1 hours 6 minutes 57 seconds	25
44	fareeha saeed	1 hours 18 minutes 16 seconds	25
45	Kadmore khan	56 minutes 11 seconds	24
46	M.talha	1 hours 45 minutes 56 seconds	24
47	fazal hadi	1 hours 29 minutes 30 seconds	23
48	shamaila	30 minutes 47 seconds	21

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