CMT Device Hardware & Software 3

Question 1

What is the purpose of the IMEI number on a mobile device?

Accepted Answer

It uniquely identifies the physical device on cellular networks

Answer

The IMEI (International Mobile Equipment Identity) is a 15-digit number that uniquely identifies a mobile device on cellular networks.

Question 2

A smartphone's GPS is inaccurate indoors but accurate outdoors. What is the most likely explanation?

Accepted Answer

GPS relies on line-of-sight to satellites and is blocked by structures

Answer

GPS signals from satellites cannot penetrate most building materials, so indoor accuracy is naturally poor without assisted GPS (A-GPS) via Wi-Fi or cell data.

Question 3

Which storage interface standard offers faster read/write speeds on modern flagship smartphones compared to eMMC?

Accepted Answer

UFS (Universal Flash Storage)

Answer

UFS (Universal Flash Storage) uses a serial full-duplex interface enabling simultaneous reads and writes, significantly outperforming eMMC.

Question 4

After installing a third-party screen protector, a customer reports Face ID no longer works. What is the most likely cause?

Accepted Answer

The protector is blocking the TrueDepth camera or IR sensor

Answer

Face ID depends on the TrueDepth camera system and IR sensors; a protector covering or reflecting IR light prevents accurate face mapping.

Question 5

A technician notices swelling in a lithium-ion battery during a repair. What is the correct action?

Accepted Answer

Safely remove the battery and follow hazardous materials disposal procedures

Answer

A swollen Li-ion battery has dangerous gas buildup and must be carefully removed and disposed of through proper hazardous/e-waste channels.

(CMT) Certified Mobile Tech Practice Test

(CMT) Certified Mobile Tech Practice Test

CMT Device Hardware & Software 3