Computer and information technology MCQs with Explanations
Computer and Information Technology covers computer fundamentals, hardware, software, networking, operating systems, internet technologies, cybersecurity and digital communication. This topic is essential for SSC, Banking, Railway, UPSC and other government examinations.
Correct Answer:
(C) A removable secondary storage unit
A pen drive or a USB flash drive is a portable data storage device. Pen drives have replaced the floppy drives of the past and have become the most popular data-storage devices among consumers. It is smaller and handy.
Ques: 2
Due to the improper/indiscriminate disposal of old and used computers or their parts, which of the following are released into the environment as e-waste?
Select the correct answer using the codes given below
Correct Answer:
(B) 1, 2, 3, 5 and 6
Heptachlor is not an e-waste. In fact, it is an organochlorine compound which is used as an insecticide usually sold as a white or tan powder. Heptachlor is one of the cyclodiene insecticides. Plutonium is a radioactive metal and hence not used in computers. So, option (b) is correct.
Ques: 3
The internet works on:
Correct Answer:
(B) Packet switching only
Packet switching is a digital networking communication method that groups all the transmitted data into suitably sized blocks called packets, which are transmitted via a medium. The best-known use of packet switching is the internet and most local area networks.
Ques: 4
What is the difference between Bluetooth and Wi-Fi devices?
Bluetooth uses 2.4 GHz radio frequency band whereas Wi-Fi can use 2.4 GHz or 5GHz frequency band.
Correct Answer:
(A) Bluetooth is used for Wireless Local Area Networks (WLAN) only, whereas Wi-Fi is used for Wireless Wide Area Networks (WWAN) only.
Bluetooth is a wireless technology standard for exchanging data over short distance using short-wavelength UHF radio waves in the ISM band from 2.4 to 2.485 GHz from fixed and mobile devices and building personal area networks, Wi-Fi means a local area wireless computer network technology that allows electronic devices to connect with network, mainly using the 2.4 gigahertz UAF and 5 gigahertz SHF ISM radio band.
Ques: 5
In the field of computer, VIRUS stands for:
Correct Answer:
(B) Vital Information Resource Under Siege
In the field of computer, VIRUS stands for 'Vital Information Resources Under Siege'. A computer virus is a malicious program or software which is designed to interfere with the normal functioning of a computer together with its files.
Ques: 6
Firewall is used in Communication Network/system for protection from –
Correct Answer:
(A) Unauthorized attack
Firewall is a system designed to prevent an unauthorized private network to be created. Firewalls can be implemented in both hardware and software or a combination of both. Firewalls are frequently used to prevent unauthorized internet users from accessing private networks connected to the internet. All messages entering or leaving the internet pass through the firewall which examines each message and blocks those that do not meet the specified security criteria.
Ques: 7
One Byte equals to how many Bits?
Correct Answer:
(A) 8
The computer memory is expressed in kilobytes or megabytes or gigabytes. 1 byte equals to 8 binary digits (bits).
1 kilobyte = 1024 byte
1 megabyte = 1024 kilobyte
1 gigabyte = 1024 megabyte
1 terabyte = 1024 gigabyte