Vivo X21 - Full Phone Specifications Quiz

The aperture size of the X21 primary rear camera is f/1.8. Aperture size refers to the size of the opening in the camera lens that allows light to pass through. A smaller aperture number indicates a larger opening, which allows more light to enter the camera sensor. A larger aperture size like f/1.8 is beneficial in low-light conditions as it allows more light to reach the sensor, resulting in brighter and clearer images.

The correct answer is AK4376A. This is the HI-FI chipset used in X21.

The given correct answer is 6GB Ram. This implies that the Ram of x21 is 6GB.

The ROM of x21 is 128 GB expandable up to 256 GB. This means that the device comes with a built-in storage capacity of 128 GB, but it can be expanded further using a memory card up to a maximum of 256 GB.

The Funtouch version of x21 is OS 4.0.

Live photo is available in X21 because it is a feature that allows users to capture a few seconds of video before and after taking a photo. This feature adds movement and life to the captured image, making it more dynamic and engaging. With Live photo, users can relive the moment by simply pressing and holding the photo, which plays the video clip. This feature enhances the overall photography experience and is a popular feature in many smartphones, including the X21.

The correct answer is Oreo 8.1. This version of Android is commonly known as Oreo and it is the 8th major release of the Android operating system. The version number 8.1 indicates that it is a minor update to the Oreo 8.0 version, which means it includes bug fixes, performance improvements, and possibly some new features.

The correct answer is Infrared Sensor. Infrared sensors are commonly used for facial recognition at night because they can detect infrared radiation emitted by the human body, even in low light conditions. This allows the sensor to capture the unique thermal patterns of a person's face, which are then used for identification or authentication purposes. Light sensors and GPUs are not typically used for facial recognition at night.

The battery size of the X21 is 3200mAh.

The correct answer is Snapdragon 660(AIE) 2.2Ghz. This processor is used in the X21.

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The correct answer is 3D Curved Glass. This type of glass is used to make the back of X21 look stylish and upscale. The term "3D" suggests that the glass has a three-dimensional curved shape, which adds a sleek and modern aesthetic to the device. The curved design also enhances the overall user experience by providing a more comfortable grip and a seamless transition between the glass and the frame of the phone.

The correct answer is 6.28. This suggests that the screen size of the X21 is 6.28 inches.

The photoelectric effect refers to the emission of electrons when light or other electromagnetic radiation is incident on a material. In the context of an under-display scanner, it implies that the scanner will only function under dark or lock screen conditions. This suggests that the scanner requires minimal ambient light interference to accurately detect fingerprints or perform its intended function.