Computer Science - Study24x7
Social learning Network

Warning: include(./views/auth.php): failed to open stream: Permission denied in /var/www/html/live/loginRightSlider.php on line 18

Warning: include(): Failed opening './views/auth.php' for inclusion (include_path='.:/usr/share/php') in /var/www/html/live/loginRightSlider.php on line 18
computersciencequestions Cover image
computersciencequestions
Computer Science

  • Warning: Use of undefined constant Followers - assumed 'Followers' (this will throw an Error in a future version of PHP) in /var/www/html/live/makepage.php on line 1760
    Followers
  • Latest Feeds
  • Articles
  • Question
  • Course
  • About
  • Review
Interests
Computer Science
Articles
Question
Course
About
Review
Gallery

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 16 Jan 2026 01:24 PM study24x7 study24x7

The transistor has a collector current of 10 mA and a base current of 40 mA. What is the current gain of the transistor?

A

250 μA

B

350 μA

C

0.25 μA

D

300 μA

Computer Science
Like | 2 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 16 Jan 2026 01:23 PM study24x7 study24x7

How much current flows through a 0.02-H choke that is operating from a 12-V ac, 100-Hz source?

A

0.02 A

B

0.955 A

C

10 A

D

2.02 A

Computer Science
Like | 2 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 16 Jan 2026 01:22 PM study24x7 study24x7

Doubling the operating voltage of a purely capacitive circuit:

A

has no effect on the capacitive reactance

B

doubles the amount of capacitive reactance

C

multiplies the capacitive reactance by 7

D

cuts the capacitive reactance in half

Computer Science
Like | 2 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 12 Jan 2026 01:27 PM study24x7 study24x7

A battery is a device composed of one or more:

A

chemical cells

B

voltage generators

C

solar cells

D

piezoeletric cells

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 12 Jan 2026 01:26 PM study24x7 study24x7

A high-pass filter:

A

passes lower-frequency signals and reduces higher-frequency signals

B

passes higher-frequency signals and reduces lower-frequency signals

C

has no effect on ac signals

D

increases the level of all frequencies by a significant amount

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 12 Jan 2026 01:25 PM study24x7 study24x7

The rms value of a sine waveform is:

A

the number of cycles completed in one second

B

the time required to complete one full cycle

C

equal to 0.707 times the peak amplitude

D

equal to 1.41 times the peak amplitude

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 09 Jan 2026 12:21 PM study24x7 study24x7

A zener regulator has an input voltage from 15 to 20 V and a load current from 5 to 20 mA. If the zener voltage is 6.8 V, what value should the series resistor have?

A

310 Ohm

B

400 Ohm

C

410 Ohm

D

550 Ohm

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 09 Jan 2026 12:20 PM study24x7 study24x7

The knee voltage of a diode is approximately equal to the

A

Applied voltage

B

Barrier potential

C

Breakdown voltage

D

Forward voltage

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 09 Jan 2026 12:19 PM study24x7 study24x7

Which one of the following phrases most accurately describes a purely inductive circuit?

A

Resistances provide the only opposition to current flow

B

Inductive reactance provides the only opposition to current flow

C

Combinations of resistance and inductive reactance provide any opposition to current flow

D

The ac voltage lags the current by 90 degree

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 09 Jan 2026 12:18 PM study24x7 study24x7

Household light bulbs have a given power rating, and they operate at 120 V. Which one of the following equations most directly provides the current rating of these light bulbs?

A

P = I2R

B

P = IE

C

P = E2/R

D

I = P/E

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 08 Jan 2026 01:27 PM study24x7 study24x7

A transformer has a primary voltage of 120 V rms and a secondary voltage of 25 V rms. If the secondary current is 1A rms, what is the primary current?

A

7.8 mA

B

208 mA

C

200 mA

D

300 mA

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 08 Jan 2026 01:27 PM study24x7 study24x7

Which one of the following phrases best describes residual magnetism?

A

Magnetism that remains in the core of an electromagnet after the current through the coil is turned off

B

The force of attraction between the poles of a permanent and temporary magnetic field

C

The amount of magnetic flux that is not confined to the core material of an electromagnet

D

The circular magnetic field that surrounds a conductor carrying a current

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 08 Jan 2026 01:26 PM study24x7 study24x7

Which one of the following statements best describes magnetic hysteresis?

A

Hysteresis is the amount of magnetic flux that is not confined to the core material of an electromagnet

B

Hysteresis is most apparent when a steady amount of current is lowing through the coil of an electromagnet

C

Hysteresis is most apparent when the current through the coil of an electromagnet changes frequently

D

Hysteresis is most apparent when the core material is saturated

Computer Science
Like | 4 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 07 Jan 2026 01:20 PM study24x7 study24x7

The equivalent of 1 micro A is:

A

10000A

B

1000 A

C

one-millionth of an ampere

D

one million amperes

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 07 Jan 2026 01:19 PM study24x7 study24x7

What form of energy is used to maintain an imbalance of charges between the terminals of a battery?

A

Electronical energy

B

Mechanical energy

C

Chemical energy

D

Solar energy

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 07 Jan 2026 01:18 PM study24x7 study24x7

Which one of the following devices is most often used for measuring opposition to current flow in a circuit?

A

Ammeter

B

Voltmeter

C

Ohmmeter

D

Wattmeter

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 06 Jan 2026 03:50 PM study24x7 study24x7

How many types of flow are there in a semiconductor?

A

0

B

1

C

2

D

3

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 06 Jan 2026 03:30 PM study24x7 study24x7

When the collector current increases, what does the current gain do?

A

decreases

B

stays the same

C

increases

D

any of the above

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 06 Jan 2026 03:28 PM study24x7 study24x7

Waveforms are graphs that show:

A

frequency on the vertical axis and amplitude on the horizontal axis

B

amplitude on the vertical axis and frequency on the horizontal axis

C

amplitude on the vertical axis and the passage of time on the horizontal axis

D

the passage of time on the vertical axis and amplitude on the horizontal axis

Computer Science
Like | 5 Comment Share
study24x7
Write a comment

Warning: count(): Parameter must be an array or an object that implements Countable in /var/www/html/live/makepost.php on line 52
Computer Science
8 followers study24x7 05 Jan 2026 04:42 PM study24x7 study24x7

In a pure inductor:

A

ac current leads the voltage by 90 degree

B

ac current and voltage are exactly in phase

C

ac current lags the voltage by 90 degree

D

ac current is converted to dc voltage

Computer Science
Like | 5 Comment Share
study24x7
Write a comment
Ratings
0.0
out of 5 0 Ratings
5 study24x7
 
0.0
4 study24x7
 
0.0
3 study24x7
 
0.0
2 study24x7
 
0.0
1 study24x7
 
0.0
Related Pages
❮ ❯