Wrong.

From the object management settings for Lead, you can map custom Lead fields to custom fields of Accounts, Contacts and Opportunities.

Link to Salesforce Help : Map Custom Lead Fields for Lead Conversion

Wrong.

Chatter users can invite customers to a private group they own, and customer invitations are enabled by default (you can disable it by deselecting Allow Customer Invitations in the Chatter Settings section of Setup). Chatter users can receive notifications when there are changes to a record, and they can choose to follow a specific record. Chatter also allows users to add a profile picture to their profile.

Link to Salesforce help : Customer Invitations

Link to Salesforce help : Chatter

Wrong.

Using the “Manage Campaign Members” button on the “Campaign Members” related list of a Campaign record, you can add new record and/or update existing records, and you can import up to 50,000 records at a time.
You can add Leads, Contacts or person Accounts to Campaigns, but you can’t associate Opportunities to Campaigns.

Link to Salesforce Help : Manage Campaign Members

Wrong.

You can use a screen element, and add the “File Upload” component to the screen.

Wrong.

To be able to access a particular record from a flow launched using a Quick Action on the record page, you just have to create a “recordId” record variable in the flow, and make it available for input. The Quick Action will automatically pass the record to the “recordId” variable.

You don’t need to add a “Get Records” element in the flow, nor to edit the record page to pass the record to the flow.

Link to Salesforce help : Pass in the record to a Flow

Wrong.

There’s 2 places in Setup where you can see the number of remaining licenses : System Overview page and Company Information page.

Wrong.

A cross-object formula can reference fields up to 10 relationships away from master or parent object.

Link to Salesforce Help : Formulas

Wrong.

The 3 types of access you can grant to report folders are Viewer access, Editor access and Manager access.

Link to Salesforce help : Access Levels for Reports and Dashboards Folders

Wrong.

Accounts, Contacts and Leads objects can be used to create Campaign Members (for Accounts, you have to enable Accounts as Campaign Members setting).

Link to Salesforce help : Get to Know Salesforce Campaigns

Wrong.

You can delete 250 records at once with Mass Delete Records.

Link to Salesforce help : Notes on Using Mass Delete