Tag: science & technology

Quizzes (551) Questions (11015)

Questions Related to science & technology

Multiple choice general knowledge science & technology

Juan drives around a circular bend at constant speed. We can infer that his car :

  1. accelarates.

  2. retards.

  3. remains at constant velocity.

  4. no such inference can be made.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

When an object moves in a circle at constant speed, its velocity is constantly changing direction. Acceleration is defined as change in velocity (which includes direction). The car accelerates toward the center of the circle (centripetal acceleration).

Multiple choice general knowledge science & technology

If a feather and hammer are dropped on the Moon at the same time from the same height they will hit the Moon’s surface at virtually the same time.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

On the Moon, there is no air resistance, so all objects fall with the same acceleration regardless of mass. Both the feather and hammer would hit the surface simultaneously, as demonstrated by Apollo 15 astronaut David Scott.

Multiple choice general knowledge science & technology

The weight of a 1 kg stone is :

  1. 1 kg

  2. 1 N

  3. 9.8 N

  4. Depends on the distance from the earth
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Weight is the force of gravity on an object and depends on gravitational acceleration (g). Since g varies with distance from Earth's center, the weight of a 1 kg stone is not constant. The weight would be about 9.8 N on Earth's surface but less at higher altitudes or on other celestial bodies. Mass (1 kg) stays constant.

Multiple choice general knowledge science & technology

The pressure at the bottom of a 10-meter-deep, 20-kilometer-wide lake is higher than the pressure at the bottom of a 10-meter-deep well which is only 1 meter across. (Assume all things are equal except the parameters mentioned.)

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Pressure in a fluid depends only on depth, not on the width or volume of the container. Both the lake and the well are 10 meters deep, so the pressure at the bottom is identical (P = ρgh, where h is depth). The large width of the lake doesn't increase pressure.