Skip to content

Online Transactions, Payments and Security, ISC 11

questionbuddy.in/isc/class-11/business-studies/e-business/online-transactions-payment-mechanisms-and-security

Business StudiesISC Class 11 · e-Business

Online Transactions, Payments, Blockchain and Security: ISC Class 11 Business Studies

Updated 17 October 2026 · Fact-checked

An online transaction passes through registration and login, selecting goods and placing the order, payment, confirmation and delivery. Payment mechanisms include cash on delivery, cards, net banking, UPI, e-wallets and payment gateways. Blockchain is a shared, tamper-resistant digital ledger of linked blocks; crypto-assets are digital assets built on it. Security rests on passwords, encryption, firewalls, digital signatures and user caution.

Understand Online Transactions, Payment Mechanisms, Blockchain and Security

Steps of an online transaction. (1) Registration/log-in on the site or app. (2) Choosing items and adding to the cart. (3) Placing the order with address and details. (4) Making payment. (5) Order confirmation and invoice. (6) Dispatch, delivery and tracking. (7) After-sales service: returns, refund, feedback.

Payment mechanisms.

  • *Cash on delivery (COD):* payment when goods arrive; no online risk, but risk of refusal and cost of handling.
  • *Cards (debit/credit):* entered on a secure payment page; instant.
  • *Net banking:* direct transfer from the bank account via the bank's website.
  • *UPI and wallets:* mobile based, instant.
  • *Payment gateway:* a service between customer and merchant that securely passes payment data and confirms the payment.

Blockchain (meaning). A shared digital ledger in which records (transactions) are grouped in blocks; each block is linked to the previous one by a cryptographic code, so changing an old record would break the chain. It is kept by many computers, with no single owner, which makes tampering difficult.

Crypto-assets (meaning). Digital assets that use cryptography and blockchain and are not issued by a central bank. Their prices can swing sharply and they are not the legal tender; users should understand the risk and the rules before dealing in them. The digital rupee, by contrast, is central bank currency in digital form.

Security and safety.

  • *Encryption:* scrambling data so only the intended receiver can read it (shown as https and the padlock).
  • *Firewall:* blocks unauthorised access to a network.
  • *Digital signature and certificate:* prove the sender's identity and that the message is unchanged.
  • *Passwords, PIN, OTP, two-step verification.*
  • *Antivirus and updates; avoid public Wi-Fi for payments; check URLs.*

Risks. Phishing, fake sites, data breach, non-delivery, unauthorised payments.

Online Transactions, Payment Mechanisms, Blockchain and Security: key facts

Transaction flow
  • Register
  • Select
  • Order
  • Pay
  • Confirm
  • Deliver
  • Service
Seven stages.
Payment options
  • COD
  • Card
  • Net banking
  • UPI
  • Wallet
  • Gateway
Choose by speed and safety.
Security tools
  • Encryption
  • Firewall
  • Digital signature
  • OTP
  • Antivirus
Layers of protection.

How to answer Online Transactions, Payment Mechanisms, Blockchain and Security questions

Describe the steps in order and tie each mechanism to a risk or benefit.

  1. 1List the stages of the transaction.
  2. 2Match the payment method to the case.
  3. 3Explain the security tool relevant to the risk.
  4. 4State the meaning (not trading advice) when asked about blockchain or crypto-assets.

Online Transactions, Payment Mechanisms, Blockchain and Security in real life

The idea, met in an everyday situation. Answer the question in your own words, then compare with the model answer. The one-line hook is what to remember.

Payment choice

Suppose Rahul is ordering a gift from a seller he has never dealt with before and is worried about a fake site.

Which payment mechanism lowers his risk, and why?

Try it first, then show the solutionSolution
  1. Cash on delivery means he pays only when the parcel arrives.
  2. He can check the goods before paying.

Answer: Cash on delivery lowers the risk.

Memory hook: Unknown seller? Pay on delivery.

Tricks to remember Online Transactions, Payment Mechanisms, Blockchain and Security

Short memory aids. Say each one aloud once, then use it on a question the same day.

  • ROP-PCD

    Register, Order, Pay, Confirm, Deliver.

    Use it when: Stages.

  • https = secure

    Look for https and the padlock before paying.

    Use it when: Safety.

  • Block chain

    Blocks linked by codes; hard to alter.

    Use it when: Blockchain.

Online Transactions, Payment Mechanisms, Blockchain and Security: solved examples

Ordered from board level to HOTS. Try each one before you open the solution.

Example 1: Encryption · 1 mark · MCQBoard level

The process of converting data into a code so that only authorised persons can read it is:
(a) hacking (b) encryption (c) phishing (d) spamming

Try it first, then show the solutionSolution
  1. Scrambling data is encryption.

Answer: (b) encryption

Example 2: Steps · 4 marks · Short answerBoard level

Describe the steps involved in an online purchase. (4 marks)

Try it first, then show the solutionSolution
  1. Log in or register.
  2. Select items and place the order.
  3. Pay by a chosen mechanism.
  4. Confirmation, delivery and after-sales service.

Answer: Registration/log-in, selection and order, payment, confirmation, delivery and after-sales service.

Example 3: Payment mechanisms · 6 marks · Long answerHarder board level

Compare cash on delivery, card payment and UPI on two merits and one limitation each. (6 marks)

Try it first, then show the solutionSolution
  1. COD: no online risk, trust for new sellers; limitation: delivery person must collect, risk of refusal.
  2. Card: instant, widely accepted; limitation: card data theft risk.
  3. UPI: instant, 24x7; limitation: needs mobile network and risk of fake collect requests.

Answer: COD: safe for new customers, no need for an account; limitation, refusal at delivery. Card: instant and global; limitation, data theft. UPI: instant and simple; limitation, requires network and caution against fraud.

Example 4: Transaction cost · 4 marks · Short answerHarder board level

An online seller charges Rs 25 for COD handling, 2% of the price for cards and no charge for UPI. A buyer orders goods of Rs 1,500 with a delivery fee of Rs 40. Find the amount he pays under each method. (4 marks)

Try it first, then show the solutionSolution
  1. COD: 1,500 + 40 + 25 = Rs 1,565.
  2. Card: 2% of 1,500 = 30; total 1,500 + 40 + 30 = Rs 1,570.
  3. UPI: 1,500 + 40 = Rs 1,540.

Answer: COD Rs 1,565; card Rs 1,570; UPI Rs 1,540.

Example 5: Security case · 4 marks · Short answerHOTS / competency

A shopping site address starts with "http" without the padlock and asks for card details. Explain the risk and what the customer should do, naming two safety tools. (4 marks)

Try it first, then show the solutionSolution
  1. Without https, data is not encrypted and can be intercepted.
  2. Do not enter card details; check the web address and use only secure official sites.
  3. Safety tools: encryption (https) and a firewall; use OTP verification.

Answer: The data may be intercepted; avoid the site and use only encrypted (https) pages with OTP verification.

Where students lose marks in Online Transactions, Payment Mechanisms, Blockchain and Security

The slips examiners see most often, and what to write instead.

  • Mistake: Treating a crypto-asset as legal tender

    Name confusion.

    Wrong working

    Crypto-assets are currency of the country

    Right working

    Digital assets not issued by the central bank

    Do this: State meaning and risk.

    Usually costs: 1-2 marks.

  • Mistake: Mixing COD and net banking

    Both are payment modes.

    Wrong working

    COD uses the bank website

    Right working

    Net banking uses the bank website

    Do this: Define each in one line.

    Usually costs: 1 mark.

  • Mistake: Omitting after-sales service as a step

    Ending at delivery.

    Wrong working

    Delivery is the last step

    Right working

    Returns and feedback follow

    Do this: Include service.

    Usually costs: 1 mark.

Exam tips

  • Number the stages of the transaction.
  • Pair every security tool with the risk it handles.
  • Keep blockchain and crypto answers to meaning only, unless asked more.

Practice questions on Online Transactions, Payment Mechanisms, Blockchain and Security

Write each answer on paper first. Open the hint only if you are stuck, and the answer only when you have finished.

  1. Q1 · 1 mark · MCQBoard level

    A firewall is used to:
    (a) increase internet speed (b) block unauthorised access to a network (c) make payments (d) design a website

    Hint

    Wall against intrusion.

    Answer

    (b) block unauthorised access to a network

  2. Q2 · 3 marks · Short answerBoard level

    What is a payment gateway? State its role in an online transaction. (3 marks)

    Hint

    Between customer and merchant.

    Answer

    A payment gateway is a service that securely passes the customer's payment details to the bank and confirms the result to the merchant, completing the online payment.

  3. Q3 · 4 marks · Short answerHarder board level

    Explain blockchain in simple terms and state two reasons it is considered difficult to tamper with. (4 marks)

    Hint

    Chain of blocks.

    Answer

    Blockchain is a shared digital ledger in which transactions are grouped into blocks that are linked by cryptographic codes. Changing an old block breaks the chain, and the ledger is held by many computers rather than one authority.

  4. Q4 · 4 marks · Short answerHarder board level

    A buyer purchases goods priced Rs 2,400 with 5% discount, delivery Rs 60 and a payment-gateway charge of 1.5% on the discounted price if a card is used. Find the amount payable by card and by COD (COD fee Rs 30). (4 marks)

    Hint

    Discounted price 2,280.

    Answer

    Discounted price = 2,400 - 120 = 2,280. Card: gateway charge = 34.20; total = 2,280 + 60 + 34.20 = Rs 2,374.20. COD: 2,280 + 60 + 30 = Rs 2,370.

  5. Q5 · 3 marks · Short answerHOTS / competency

    A friend urges a classmate to put all her savings in a crypto-asset because "prices only go up". Evaluate with two facts from the meaning and risks of crypto-assets. (3 marks)

    Hint

    Volatility.

    Answer

    Crypto-assets are not issued by a central bank, are not legal tender and can swing sharply in price, so putting all savings in them is risky. A sound plan spreads savings and uses regulated options.

Test your recall

Answer in your head or on paper first, then open the card. Pulling an answer out of memory makes it stick far better than re-reading.

  1. 1.First step of an online purchase?Show answer

    Registration or log-in.

  2. 2.COD means?Show answer

    Cash on delivery.

  3. 3.Encryption does what?Show answer

    Scrambles data for secrecy.

  4. 4.Blockchain stores records as?Show answer

    Linked blocks.

  5. 5.Digital signature proves?Show answer

    Identity and integrity of a message.

Online Transactions, Payment Mechanisms, Blockchain and Security: frequently asked questions

Is COD safe?

Low online risk but collection issues exist.

Is crypto banned?

Not covered; follow the law in force.

What is two-step verification?

An extra code besides the password.

Is public Wi-Fi safe for payments?

Avoid it.