False. The resize operation can be done any time, even when it is running queries.

For an auto scale multi cluster virtual warehouse 1) only minimum required clusters are started 2&3) The running clusters may be scaled up and down within the maximum and minimum cluster defined

https://docs.snowflake.net/manuals/user-guide/warehouses-multicluster.html#maximized-vs-auto-scale

Correct. The number of server grows with the size e.g. Small has 2 servers while Medium has 4 servers.

The order & the number of columns in the file and the table can be different

Correct. The credit consumption starts only once all the servers are provisioned. In rare cases if one or more servers fail to provision, credits are only charged for the servers which were successfully provisioned.

See rules for stage cloning at the below link https://docs.snowflake.net/manuals/user-guide/object-clone.html#cloning-and-snowpipe

Incorrect. A snowflake share can be defined without a consumer added to it. One or more consumers can be added to the share after wards

Users are not able to see the results of queries executed by other users.

The COPY command provides the VALIDATION_MODE parameter, which can be configured to validate files without actually loading.

Please see https://docs.snowflake.com/en/sql-reference/sql/copy-into-table.html