PPC Fundamentals
1. What is PPC?
PPC (Pay-Per-Click) is an online advertising model where advertisers pay a fee each time one of their ads is clicked. It’s a way of buying visits to a site rather than earning them organically.
2. What are the main PPC platforms?
Google Ads (largest), Microsoft Advertising (Bing), Amazon Ads, Facebook/Instagram Ads (social PPC), LinkedIn Ads, Twitter/X Ads, and programmatic platforms like Display & Video 360.
3. What is the difference between PPC and SEM?
SEM (Search Engine Marketing) is the umbrella term for paid search advertising. PPC is the specific pricing model most SEM uses. Some definitions include organic SEO under SEM, but in practice, SEM = paid search.
4. Why would a business invest in PPC when SEO is free?
PPC provides immediate visibility, targets specific audiences precisely, offers complete budget and message control, generates instant data for testing, and complements SEO by dominating the full SERP or filling gaps where organic ranking is difficult.
5. What is the Google Ads auction?
Every time a user searches, Google runs an auction to determine which ads appear and in which order. Ad Rank is calculated using bid amount, Quality Score, and the expected impact of ad extensions and other formats.
6. What is Ad Rank?
The value that determines your ad position. Formula: (Bid × Quality Score) + expected impact of extensions. The advertiser with the highest Ad Rank gets the top spot.
7. What is CPC?
Cost Per Click – the actual amount you pay each time someone clicks your ad. Actual CPC is often less than your maximum bid because you only pay just enough to beat the competitor below you.
8. What is CPM?
Cost Per Mille (thousand impressions) – the cost an advertiser pays for 1,000 ad impressions. Used mainly for display and video campaigns focused on awareness rather than clicks.
9. What is CPA?
Cost Per Acquisition (or Cost Per Action) – the average cost you pay for a conversion (sale, lead, sign-up). Target CPA is a common automated bidding strategy.
10. What is ROAS?
Return On Ad Spend. Formula: Revenue from Ads / Ad Spend. If you spend 1,000andgenerate5,000 in revenue, your ROAS is 5x or 500%.
11. What is CTR?
Click-Through Rate – the percentage of people who see your ad and click on it. Formula: (Clicks / Impressions) × 100. It’s a key indicator of ad relevance and appeal.
12. What is a conversion in PPC?
A meaningful action completed by a user after clicking an ad — purchase, form submission, phone call, app install, newsletter sign-up, etc., defined by the advertiser.
13. What is impression share?
The percentage of impressions your ads received compared to the total number of impressions they were eligible for. Lost impression share (due to budget or rank) tells you where you’re missing opportunities.
14. What is Quality Score?
A diagnostic tool (1-10 scale) measuring the relevance of your keywords, ads, and landing pages. Components: expected click-through rate, ad relevance, and landing page experience. Higher Quality Score lowers CPC and improves ad position.
15. What is a keyword match type?
Match types control how broadly a keyword matches a user’s search query. Types: Broad match, Phrase match, Exact match, and (deprecated) Broad match modifier.
Keywords & Targeting
16. Explain the four main keyword match types in Google Ads.
- Broad match: Shows ads for searches related to your keyword, including synonyms and related concepts. Widest reach.
- Phrase match: Shows ads for searches that include the meaning of your keyword, in order, with additional words before or after. Moderate reach.
- Exact match: Shows ads for searches with the same meaning or intent as the keyword. Narrowest reach, highest control.
- Broad match modifier (legacy): Now absorbed into broad match; used “+” signs to lock specific words.
17. When would you use broad match vs. exact match?
Broad match for discovery, maximizing reach, and feeding data to smart bidding. Exact match for tightly controlled, high-intent terms where precision matters above scale.
18. What are negative keywords?
Keywords you add to prevent your ads from showing on irrelevant search queries. They reduce wasted spend and improve CTR and Quality Score by refining targeting.
19. How do you conduct keyword research for a PPC campaign?
Use Google Keyword Planner, analyze competitor keywords with tools like Semrush/SpyFu, leverage search term reports from existing campaigns, study audience intent, and cluster keywords into tightly themed ad groups.
20. What is the difference between a search term and a keyword?
A keyword is what you bid on (e.g., “buy running shoes”). A search term is what a user actually types into Google (e.g., “best running shoes to buy online sale”). The search terms report shows this actual query data.
21. What are long-tail keywords, and why are they valuable in PPC?
Longer, more specific search phrases (3+ words) with lower search volume but higher purchase intent and lower competition. They typically have lower CPC and higher conversion rates.
22. What is audience targeting in Google Ads?
Layering audience signals on your campaigns: affinity audiences (interests), in-market audiences (actively researching), remarketing lists (site visitors), custom intent (keywords/URLs), and demographics.
23. What is RLSA?
Remarketing Lists for Search Ads. Adjusting your search bids or targeting ads specifically to users who have previously visited your site when they later search for relevant terms.
24. How is location targeting used in PPC?
You can target campaigns to specific countries, regions, cities, or a radius around a point. Options include “Presence” (people in the location) or “Presence or Interest” (people interested in the location).
25. What is ad scheduling, and when would you use it?
Controlling what days and times your ads show. Use it when your business converts better at specific hours, when customer support is available, or to manage budget during peak demand.
Ad Copy & Creative
26. What are the components of a responsive search ad (RSA)?
Multiple headlines (up to 15) and descriptions (up to 4) provided by the advertiser. Google’s machine learning automatically tests combinations and learns which perform best for different queries.
27. Best practices for writing effective PPC ad copy.
Include target keyword in headlines, highlight a clear value proposition or unique selling point, include numbers/specifics (prices, percentages), use a strong CTA, and leverage ad extensions to add more information.
28. What is an ad extension?
Additional pieces of information you can add to your search ads, like call buttons, location, site links, callouts, structured snippets, and prices. They increase ad real estate and typically improve CTR.
29. Name five types of ad extensions.
Sitelink, Callout, Structured Snippet, Call, Location, Price, App, Promotion, Lead Form.
30. How do you A/B test an ad?
Create at least two versions of an ad within an ad group, varying one element (headline, description, CTA). Let them run until statistically significant data is collected, then pause the lower performer and iterate with a new challenger.
31. What is ad relevance, and why does it matter?
How closely your ad matches the intent behind a user’s search. High ad relevance improves Quality Score, reduces CPC, and improves CTR, creating a more efficient account.
32. What is a call-to-action (CTA), and give three examples.
A clear instruction prompting the user to take the next step. Examples: “Get Your Free Quote,” “Shop the Sale Now,” “Download the Guide.”
33. How would you write an ad for a brand with zero awareness?
Focus on the customer’s problem and the solution’s benefit, not the brand name. Use problem-aware language, strong emotional hooks (“Tired of…?”), and a risk-reducing offer like “Free Trial” or “Money-Back Guarantee.”
34. How do you tailor ad copy for mobile vs. desktop?
Mobile copy is shorter, more urgent, uses click-to-call CTAs, and leverages location extensions. Desktop can be more detailed. Google Ads allows setting a preference for mobile-optimized creatives.
35. What is dynamic keyword insertion (DKI), and what’s the risk?
A feature that automatically inserts the search query into your ad text if relevant. Risk: if the query is misspelled, includes competitor names, or is inappropriate, it can look unprofessional or violate policies. Use cautiously.
Bidding & Budget Management
36. What is manual CPC bidding?
You set maximum cost-per-click bids at the keyword or ad group level. You have full control but must monitor and adjust constantly based on performance.
37. What is Enhanced CPC (ECPC)?
A semi-automated strategy: you set manual bids, and Google automatically adjusts them up or down based on the likelihood of a conversion, within a flexible range.
38. What is Target CPA bidding?
A Smart Bidding strategy where you set a target cost per acquisition, and Google automatically sets bids to get as many conversions as possible at or near that target cost.
39. What is Target ROAS bidding?
A Smart Bidding strategy where you set a target return on ad spend (e.g., 400%), and Google automatically sets bids to maximize conversion value based on that target.
40. What is Maximize Conversions bidding?
An automated strategy that sets bids to generate the most conversions possible within your daily budget, without targeting a specific CPA.
41. What is Maximize Clicks bidding?
An automated strategy that sets bids to get as many clicks as possible within your budget. Good for traffic-focused campaigns, not necessarily conversions.
42. What is Target Impression Share bidding?
A strategy where you set a desired impression share (e.g., 90% top of page) and Google sets bids to show your ad in that position as often as possible. Used for brand defense or highly strategic terms.
43. When would you use Portfolio bid strategies?
When you want to apply a single smart bidding strategy (like Target CPA) across multiple campaigns, ad groups, or keywords, allowing shared data and efficiency optimization.
44. How do you set a daily budget for a new campaign?
Start by reverse-engineering from the target monthly spend. If monthly budget is 3,000,dailybudget≈100. Consider how quickly the campaign will spend (accelerated vs. standard delivery) and expected CPCs. Always monitor and adjust.
45. What is budget pacing?
Managing how evenly or aggressively a campaign spends its budget throughout the day/month. Standard delivery spreads it smoothly; accelerated delivery shows ads at every eligible opportunity until budget runs out.
46. What is ad spend wasted on irrelevant clicks called?
Wasted spend. This is minimized by using negative keywords, refining match types, optimizing geographic and demographic targeting, and analyzing search term reports.
47. How do you handle a campaign that’s hitting its daily budget too early?
Increase budget if ROAS is positive and scaling opportunity exists. Otherwise, reduce bids, use ad scheduling to spread spend, add negative keywords to cut low-quality traffic, or switch to standard delivery.
48. What is the difference between bid adjustments and setting a new bid?
Bid adjustments are percentage increases or decreases applied on top of a base bid for specific segments (device, location, time, audience). They don’t replace the base bid; they modify it conditionally.
49. If a campaign has a high CPA, what’s your first step before lowering bids?
Analyze conversion data: is the issue in the search term (low intent), the ad (misleading), the landing page (poor experience), or the conversion tracking (flawed)? Lowering bids without diagnosis can mask the real problem.
50. How do you adjust bids for mobile vs. desktop?
Review performance by device. If mobile CPA is 20% lower than desktop, apply a +20% mobile bid adjustment to capture more cost-effective mobile traffic, or reduce desktop bids accordingly.
Campaign Types & Strategy
51. When would you use a Search campaign vs. a Display campaign?
Search captures high-intent demand (someone looking for what you offer). Display generates awareness, reaches passive audiences, and retargets using visual ads across millions of sites/apps.
52. What is a Shopping campaign?
A campaign type for e-commerce that uses product feed data (images, prices, titles) to show product listings directly in Google Search and Shopping tab. It targets based on product attributes, not keywords.
53. What is Performance Max (P-Max)?
A goal-based campaign type that uses AI to find converting customers across all Google channels (Search, Display, YouTube, Discover, Gmail, Maps) using a single campaign setup, leveraging provided assets, audience signals, and product feeds.
54. What is a Discovery campaign?
Visually rich, personalized ads delivered across the YouTube Home feed, Discover feed, and Gmail Promotions tab. Good for reaching users ready to explore content without an active search query.
55. What is a Video campaign on YouTube?
Campaigns using video ads (skippable in-stream, bumper, non-skippable, etc.) to build awareness, consideration, or drive conversions on YouTube and Google video partners.
56. What is a Demand Gen campaign?
Google’s evolution of Discovery campaigns, designed for social-like, visually engaging ads across YouTube (Shorts, In-feed), Discover, and Gmail to drive conversions and demand with richer storytelling.
57. What is a Brand campaign, and why run it?
A campaign bidding on your own branded keywords. It defends your branded SERP real estate from competitors, controls messaging exactly, and captures high-intent traffic at typically very low CPC.
58. What is a Competitor campaign?
Bidding on competitor brand names or product keywords. Legal in most countries, but competitor names can’t appear in your ad copy (unless allowed). Often lower CTR and higher CPC, requiring a strong value proposition.
59. What is a DSA (Dynamic Search Ads) campaign?
Google crawls your website and automatically generates ads and matches users’ searches to relevant landing pages on your site. Good for covering a wide inventory or finding keyword gaps.
60. What is the difference between a standard Shopping campaign and a Performance Max campaign with a feed?
Standard Shopping gives you more manual control (bidding, audiences, negative keywords at campaign level). P-Max uses the same feed but automates across all Google channels with less granular control but broader reach.
61. How would you structure a Google Ads account for a medium-sized e-commerce store?
Campaigns organized by product category or profitability tier. Separate campaigns for Brand, Non-Brand, Competitor, and PMax/Shopping. Within campaigns, ad groups by sub-category or product type, each with tightly themed keywords and ads.
62. What’s your approach to launching a new PPC campaign from scratch?
Research (keyword/competitor/audience), create account structure, build campaigns with tightly themed ad groups, write RSA ads with all assets, set up conversion tracking, launch with conservative budget, monitor search term reports aggressively, and optimize after gathering enough data.
Measurement, Tracking & Analytics
63. How do you set up conversion tracking in Google Ads?
By installing the Google Ads conversion tag (or Google Tag Manager) on the conversion page (e.g., thank-you page), or importing goals from Google Analytics. Also supports phone calls, app installs, and offline conversion imports.
64. What is a conversion window in Google Ads?
The time period after a click (or interaction) during which a conversion can be attributed to that ad. Default is 30 days, but can be customized based on purchase cycle length.
65. What attribution model do you prefer, and why?
Data-driven attribution if account volume supports it, because it distributes credit based on actual conversion paths. If not, I’d start with a position-based or time-decay model, and move away from last-click as soon as possible.
66. What’s the difference between Google Ads conversion and Google Analytics conversion?
Google Ads counts conversions based on its own tag’s tracking, including view-through conversions for display. Google Analytics uses its session-based data, which can differ due to attribution windows, deduplication, and cookie/blocker issues.
67. What is a view-through conversion?
A conversion that occurs after a user sees (but doesn’t click) a display or video ad, and later converts on your site. It’s useful for measuring display/video impact but can overstate if not evaluated carefully.
68. Why do conversion numbers sometimes differ between Google Ads, Analytics, and a CRM?
Different attribution models, tracking methodologies (pixel vs. session), deduplication rules, time zones, and the ability to track offline events. Each platform reflects a slice of the same truth.
69. How do you use Google Tag Manager for PPC tracking?
GTM manages all tracking tags in one container. For PPC, you add Google Ads conversion tracking, remarketing tags, and custom event triggers (e.g., button clicks, scroll depth) without editing site code.
70. What is offline conversion tracking?
Importing conversions that start online (via an ad click) but complete offline, like a phone sale or in-store visit. Uses GCLID (Google Click ID) matching to tie the offline event back to the ad.
71. Which metrics matter most for a lead generation campaign?
Cost per lead (CPL), conversion rate, lead quality (if trackable downstream), total leads, impression share for relevant terms. Volume without quality is vanity.
72. How do you measure the ROI of a PPC campaign?
ROI = (Revenue from campaign – Total spend) / Total spend × 100. If revenue data isn’t available, use a proxy: value per lead × conversion number minus spend to approximate.
73. What is the Google Click ID (GCLID)?
A unique parameter appended to the URL when a user clicks a Google Ads ad. It’s used for conversion tracking, auto-tagging, and offline conversion import to match conversions to specific clicks.
74. What is ValueTrack?
Google Ads parameters (like {keyword}, {matchtype}, {device}) that dynamically insert values into your ad landing page URL, allowing granular tracking of what triggered the click in your analytics.
Optimization & Troubleshooting
75. CTR is high but conversion rate is very low. What could be wrong?
The ad likely promises something the landing page doesn’t deliver (message mismatch), or the landing page has friction (slow load, broken form, unclear CTA). Improve post-click experience.
76. Conversions suddenly dropped to zero overnight. What do you check first?
Verify conversion tracking is still firing (check Tag Assistant, real-time GA, test a conversion yourself). Then check if ads/budgets are active, landing pages are up, and automated rules haven’t paused things.
77. CPA is steadily increasing over weeks. What’s your diagnostic process?
Check for rising CPCs (new competition, Quality Score drops), declining conversion rates (landing page issues, seasonality, ad fatigue), or audience saturation in remarketing. Segment everything by campaign, keyword, device, and time.
78. Impression share lost due to budget is high. What do you do?
If the campaign is profitable, increase budget. If not, find efficiency: add negative keywords, improve Quality Score to lower CPCs, narrow targeting, or shift budget from underperforming campaigns.
79. Impression share lost due to rank is high. How do you improve it?
Improve Quality Score (better ad relevance, CTR, landing page), increase bids, or refine targeting so we’re competing on terms where we’re stronger.
80. What is ad fatigue, and how do you fix it?
When the same audience sees your ad too often, engagement and CTR decline, and costs rise. Fix by regularly refreshing creative, adding new ads into rotation, rotating audiences, and applying frequency caps in display/video.
81. A campaign targeting many keywords has a few terms consuming all the budget. What do you do?
Segment those high-spend keywords into their own campaign with a controlled budget and bid strategy, so they don’t starve the rest. Or add negatives/pause if they’re not converting.
82. How do you handle seasonality in PPC?
Analyze historical performance around seasonal peaks. Adjust budgets and bids proactively. Use seasonal ad copy (“Summer Sale”). Look at conversion rate shifts, not just traffic. Consider ad scheduling and inventory.
83. Your Shopping ads aren’t showing even though the feed is uploaded. What’s wrong?
Check the Diagnostics tab in Merchant Center for disapproval issues. Verify the feed isn’t outdated, products are in stock, and campaign priority settings aren’t being overridden by a higher-priority campaign. Check negative keywords accidentally blocking them.
84. How do you optimize a campaign that has high spend but no conversions?
Halt or pivot immediately. Analyze search terms for intent mismatch. Review landing page experience. Check if conversion tracking is properly set up. Re-evaluate keyword list and tighten match types. Test a radically different ad approach.
Advanced & Strategic Concepts
85. What is Smart Bidding, and which signals does it use?
Automated bid strategies using machine learning to optimize for conversions or conversion value in each auction. Signals: device, location, time of day, query, browser, remarketing list, ad characteristics, and more.
86. Explain a full-funnel PPC strategy.
Top of funnel: Display/Video for awareness (CPM/CPV). Mid-funnel: Search for consideration (keywords around “best,” “reviews”), RLSA to re-engage. Bottom of funnel: high-intent exact match search and Shopping for “buy now” terms, retargeting for cart abandoners.
87. How do you properly A/B test landing pages in PPC?
Send equal traffic to two distinct landing page URLs using the same ads (campaign experiment or rotating ad destinations). Ensure statistical significance before declaring a winner. Test one major element or layout at a time.
88. What is the Google Ads Editor?
A free, downloadable desktop application for managing Google Ads accounts offline in bulk. It allows you to make large-scale changes (campaigns, keywords, ads) quickly, review them, and upload them.
89. How do you manage PPC for a multi-language or international market?
Separate campaigns by language and target country. Use appropriate language keywords, local currency, localized ad copy and landing pages. Use location and language settings precisely. Ensure Merchant Center feeds match local regulations if applicable.
90. How do you integrate PPC with other marketing channels?
Share search term data with SEO for content ideas. Align paid and organic strategy to own more SERP real estate. Use PPC audiences for email nurture sequences. Retarget blog visitors with PPC. Consistent messaging across all channels.
91. What is a Performance Planner in Google Ads?
A tool that uses machine learning to forecast campaign performance and recommend budget changes to meet specific goals, showing how different spend levels might impact key metrics.
92. What is the Microsoft Advertising platform, and how does it differ from Google Ads?
Microsoft’s PPC platform for Bing, Yahoo, and AOL search. Smaller audience, often lower competition/CPC, older demographic, and unique features like LinkedIn profile targeting. Many Google Ads campaigns can be imported directly.
93. What is a P-Max campaign’s biggest limitation?
Less transparency and control: you can’t see detailed performance by channel (Search, Display, etc.), can’t add standard negative keywords at the campaign level (only account-level or via support), and reliance on creative asset strength.
94. What is a data exclusion in Smart Bidding?
A feature that tells Smart Bidding to ignore conversion data during a specified period — typically used when there’s a conversion tracking outage or unusual spike, preventing the algorithm from learning faulty patterns.
95. What is a fraud click, and how can you handle it?
Invalid clicks generated with malicious intent (competitors, bots). Google automatically filters many, but you can monitor via invalid clicks reports, exclude suspicious IPs, and use third-party fraud prevention tools for display and video.
Behavioral & Scenario-Based Questions
96. A client wants to spend more money because “we’re not showing up all the time.” Their impression share is already 95%. How do you respond?
Explain that the remaining 5% might be captured at an extremely high cost with diminishing returns. Show the data: we’re visible in nearly all relevant searches. Suggest redirecting the extra budget to new high-opportunity keywords or channels.
97. A client insists on bidding on a competitor’s expensive, low-ROI keyword. What do you do?
Present the performance data showing the low ROI. If they still want it, I’ll comply, but I’ll suggest a smaller test budget, monitor it closely, and agree to a review point where we either scale or kill it based on hard numbers.
98. Walk me through a time you significantly improved a failing campaign.
(Structure your own story): I inherited a campaign with high CPA and low volume. I restructured ad groups from broad to tight theme, rewrote ads around specific USPs, added 200 negative keywords, fixed the broken tracking, and shifted to Target CPA bidding. In 2 months, CPA dropped 40% and lead volume tripled.
99. How do you present PPC results to a non-technical stakeholder?
I focus on business outcomes: leads generated, cost per lead, total revenue, ROAS. I use simple visualizations and avoid jargon. I map ad spend to pipeline or sales and connect everything to the company’s larger goals.
100. What do you think is the future of PPC?
Increased automation and AI, wider use of Performance Max and similar goal-based campaigns, first-party data becoming the most valuable asset due to privacy changes, the rise of visual and voice search ads, and deeper integration of PPC into full customer journey orchestration rather than standalone channel management.