Physics Test 7: Current Electricity

Physics Test 7: Current Electricity

This test contains 20 questions. There are 10 questions on each page.You will be given 60 minutes to answer. You can do this quiz an number of times

Time limit: 0

Test Summary

0 of 20 Questions completed

Questions:

Information

You have already completed the test before. Hence you can not start it again.

Test is loading…

You must sign in or sign up to start the test.

You must first complete the following:

Results

Test complete. Results are being recorded.

Results

0 of 20 Questions answered correctly

Your time:

Time has elapsed

You have reached 0 of 0 point(s), (0)

Earned Point(s): 0 of 0, (0)
0 Essay(s) Pending (Possible Point(s): 0)

Categories

Current Electricity 0%

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20

Current
Review
Answered
Correct
Incorrect

Question 1 of 20

1. Question

A glass rod is rubbed with a piece of silk and is positively charged. The glass rod became charged by

gaining protons
Correct Incorrect Correct answer

losing protons
Correct Incorrect Correct answer

losing electrons
Correct Incorrect Correct answer

gaining electrons
Correct Incorrect Correct answer

Correct

Incorrect
Question 2 of 20

2. Question

The current in a wire is one ampere if a charge of

10 coulombs flows through it in 10 seconds
Correct Incorrect Correct answer

1 coulomb flows through it in 10 second
Correct Incorrect Correct answer

10 coulombs flow through it in 1 second
Correct Incorrect Correct answer

100 coulombs flows through it in 10 seconds
Correct Incorrect Correct answer

Correct

Incorrect
Question 3 of 20

3. Question

Which of the following statements about alternating current is TRUE?

It can be changed into direct current by a transformer.
Correct Incorrect Correct answer

It can be rectified by using a semiconductor diode.
Correct Incorrect Correct answer

It can be used to recharge a battery.
Correct Incorrect Correct answer

It can be used to transmit electrical energy because of its high frequency.
Correct Incorrect Correct answer

Correct

Incorrect
Question 4 of 20

4. Question

Which of the following statements about insulators is/are true?

I. In an insulator all electrons are bound firmly to their atoms.
II. In an insulator many electrons can move freely from atom to atom.
III. An insulator cannot be charged by rubbing.
IV. A good insulator retains the charge better than a conductor.

I only
Correct Incorrect Correct answer

I and II only
Correct Incorrect Correct answer

II and III only
Correct Incorrect Correct answer

II and IV
Correct Incorrect Correct answer

Correct

Incorrect
Question 5 of 20

5. Question

The graph below shows the variation of altemating Current with time.

The value of the current I₁ at time t₁ is called the

sinusoidal value
Correct Incorrect Correct answer

peak value
Correct Incorrect Correct answer

root mean square value
Correct Incorrect Correct answer

average value
Correct Incorrect Correct answer

Correct

Incorrect
Question 6 of 20

6. Question

The current in wire P in the diagram is 0.9 A. The current in the wire Q is

12 A
Correct Incorrect Correct answer

0.8 A
Correct Incorrect Correct answer

0.9 A
Correct Incorrect Correct answer

l.0 A
Correct Incorrect Correct answer

Correct

Incorrect
Question 7 of 20

7. Question

Which of the following formulae (in which the symbols have their usual meaning) is a mathematical expression of Ohm’s Law?

V=IR
Correct Incorrect Correct answer

P= VI
Correct Incorrect Correct answer

Q=IT
Correct Incorrect Correct answer

E=PT
Correct Incorrect Correct answer

Correct

Incorrect
Question 8 of 20

8. Question

The resistance of an IDEAL ammeter is assumed to be

zero
Correct Incorrect Correct answer

0.1 ohm
Correct Incorrect Correct answer

1 to 2 ohm
Correct Incorrect Correct answer

infinite
Correct Incorrect Correct answer

Correct

Incorrect
Question 9 of 20

9. Question

Which of the following diagrams represents the curent/potential difference relationship for a metallic conductor at a constant temperature?

A
Correct Incorrect Correct answer

B
Correct Incorrect Correct answer

C
Correct Incorrect Correct answer

D
Correct Incorrect Correct answer

Correct

Incorrect
Question 10 of 20

10. Question

In which of the following diagrams are resistors P and Q in series with each other and parallel with R?

A
Correct Incorrect Correct answer

B
Correct Incorrect Correct answer

C
Correct Incorrect Correct answer

D
Correct Incorrect Correct answer

Correct

Incorrect
Question 11 of 20

11. Question

In domestic installation systems, which of the following should be placed in the live wire?

I. Switches
II. Circuit breakers
III. Fuses

I only
Correct Incorrect Correct answer

III only
Correct Incorrect Correct answer

II and Ill only
Correct Incorrect Correct answer

I, II and Ill
Correct Incorrect Correct answer

Correct

Incorrect
Question 12 of 20

12. Question

An appliance is connected to the mains by a cable which has three wires. What colour should the insulation be on the lead connected to the fuse?

Brown
Correct Incorrect Correct answer

Black
Correct Incorrect Correct answer

Blue
Correct Incorrect Correct answer

Green/yellow
Correct Incorrect Correct answer

Correct

Incorrect
Question 13 of 20

13. Question

Which of the following statements is true of a secondary cell?

It is formed by connecting two or more primary cells.
Correct Incorrect Correct answer

It can be recharged by passing a direct current in the opposite direction to which it delivers current.
Correct Incorrect Correct answer

It can be recharged by passing a direct current in the same direction as it delivers current
Correct Incorrect Correct answer

It can be recharged by 'topping up' with dilute sulphuric acid.
Correct Incorrect Correct answer

Correct

Incorrect
Question 14 of 20

14. Question

The diagram below shows a battery connected across three resistors connected in parallel.

It is ALWAYS true that the

potential difference is the same across each resistor
Correct Incorrect Correct answer

current is the same in each resistor
Correct Incorrect Correct answer

applied voltage is proportional to the net resistance
Correct Incorrect Correct answer

voltage across a given resistance is dependent on the value of the resistors
Correct Incorrect Correct answer

Correct

Incorrect
Question 15 of 20

15. Question

Which of the following gives the correct colour code for electrical wiring?

Live: Brown Neutral: Blue Earth: Green/yellow
Correct Incorrect Correct answer

Live: Red Neutral: Blue Earth: Green
Correct Incorrect Correct answer

Live: Blue Neutral: Green/yellow Earth: Brown
Correct Incorrect Correct answer

Live: Green Neutral: Brown Earth: Blue
Correct Incorrect Correct answer

Correct

Incorrect
Question 16 of 20

16. Question

Which of the following concerning voltmeters is correct?

A
Correct Incorrect Correct answer

B
Correct Incorrect Correct answer

C
Correct Incorrect Correct answer

D
Correct Incorrect Correct answer

Correct

Incorrect
Question 17 of 20

17. Question

A current I flows for a time t between two points at a potential difference of V. The power P expended is equal to

IV/t
Correct Incorrect Correct answer

IVt
Correct Incorrect Correct answer

IV
Correct Incorrect Correct answer

It
Correct Incorrect Correct answer

Correct

Incorrect
Question 18 of 20

18. Question

Which of the following equations CANNOT be used to determine the power dissipated in a resistor?

P=I²R

Correct Incorrect Correct answer

P=V²/R

Correct Incorrect Correct answer

P=VI
Correct Incorrect Correct answer

P=R/V²

Correct Incorrect Correct answer

Correct

Incorrect
Question 19 of 20

19. Question

The electric power supplied to homes and to factories is alternating rather than direct because

the use of A.C. reduces electrical hazards
Correct Incorrect Correct answer

the use of A.C. reduces transmission losses
Correct Incorrect Correct answer

A.C. enables a wider variety of appliances to be used
Correct Incorrect Correct answer

A.C. power lines are less likely to be struck by lightning than D.C. power lines
Correct Incorrect Correct answer

Correct

Incorrect
Question 20 of 20

20. Question

Which of the following equations is NOT correct?

A
Correct Incorrect Correct answer

B
Correct Incorrect Correct answer

C
Correct Incorrect Correct answer

D
Correct Incorrect Correct answer

Correct

Incorrect

Login

Accessing this course requires a login. Please enter your credentials below!

Username or Email Address

Password

Remember Me

Lost Your Password?

Register

Don't have an account? Register one!

Register an Account