Technological Knowledge MCQs with Answers and Explanations

What unique findings did the Perseverance rover detect in Mars' Jezero Crater in 2025?

A. Liquid water lakes
B. Leopard-like spots on rocks, hinting at past life
C. Active volcanic vents
D. Earth-like atmosphere samples

Explanation:
It found reddish "leopard spots" on rocks that may be linked to ancient microbial activity.

Recent data from the Dark Energy Spectroscopic Instrument (DESI) suggests that dark energy:

A. Is constant over time
B. Is weakening over time
C. Has been proven not to exist
D. Is stronger than gravity

Explanation:
DESI findings indicate dark energy's strength appears to have decreased in the last few billion years.

Astronomers identified "little red dots" in deep James Webb images as:

A. Distant galaxies
B. Black holes forming in the early universe
C. Nearby nebulae
D. Cosmic strings

Explanation:
Spectral analysis showed they are supermassive black holes in formation shortly after the Big Bang.

The interstellar object 3I/ATLAS, discovered in 2025, is classified as which of the following?

A. Asteroid
B. Comet
C. Planet
D. Spacecraft

Explanation:
3I/ATLAS is a comet from interstellar space, not bound to the Sun's orbit.

Why might a roboticist use sensors like accelerometers or gyroscopes?

A. To convert electrical energy into motion
B. To measure motion, orientation, and acceleration
C. To provide power to the robot
D. To store data

Explanation:
Accelerometers and gyroscopes measure acceleration and rotational motion, respectively, to support the robot's navigation and balance.

What is a key feature of a humanoid robot compared to other robots?

A. It has a fixed operating radius
B. It has a human-like body structure
C. It operates only underwater
D. It mimics insect movement

Explanation:
Humanoid robots are designed with a human-like body form, usually with two arms, two legs, and a torso.

Which coordinate system is typically used to represent a robot's end-effector orientation in 3D space?

A. Euler angles
B. RGB color space
C. Cartesian coordinates
D. Binary coordinates

Explanation:
Euler angles (or quaternions) are often used to describe the 3D orientation of a robot's end-effector.

What is an advantage of using electric motors over hydraulic actuators in robotics?

A. Higher power-to-weight ratio
B. Safer, with easier control and less maintenance
C. No need for electricity
D. Unlimited torque output

Explanation:
Electric motors provide precise control and are generally cleaner and simpler to maintain than hydraulic systems.

In terms of robot classification, what distinguishes an industrial robot?

A. Operated remotely via telepresence
B. Designed specifically for factory automation tasks
C. Uses only biological components
D. Lack of any sensors

Explanation:
Industrial robots are designed for tasks such as assembly and welding in manufacturing environments.

What does a PID controller do in robotics?

A. Manages power distribution
B. Controls position/speed by minimizing error
C. Encrypts communication
D. Processes sensor data into images

Explanation:
PID (Proportional-Integral-Derivative) controllers use feedback to minimize the error in movement by adjusting control inputs.