This General Science quiz on Gravitation and Pressure puts 10 multiple-choice questions to you, the verified MCQs published with GK24's note on the topic. Every question carries a full explanation of why the correct option is right and why the other options are wrong, so you learn the fact behind the answer rather than the letter. Attempt it right after reading the note, keep to the timer, and use the explanations at the end to mark what needs another look. Sit it again before the exam as a quick revision of the topic.
10 questions with answers and explanations
What is the SI unit of pressure?
Pressure is thrust per unit area, so its unit is one newton per square metre, and this unit is named the pascal after Blaise Pascal.
Read the full explanation →The value of acceleration due to gravity on the earth is maximum at which of the following?
The earth is flattened at the poles, so the distance from the centre is least there, and since g varies inversely as the square of that distance, g is largest at the poles.
Read the full explanation →The escape velocity from the surface of the earth is approximately
Escape velocity is the minimum speed a body must be given so that it leaves the gravitational pull of the planet and never returns.
Read the full explanation →Hydraulic brakes used in automobiles work on which principle?
Pascal's law states that pressure applied to an enclosed fluid is transmitted undiminished in every direction to all parts of the fluid and to the walls of the container.
Read the full explanation →The upward force experienced by a body immersed in a fluid is equal to the weight of the fluid displaced by it. This statement is known as
It states that a body immersed wholly or partly in a fluid experiences an upward buoyant force equal to the weight of the fluid displaced, so the apparent loss in weight of the body equals the weight of the displaced fluid.
Read the full explanation →The weight of a body on the surface of the moon is about how much of its weight on the surface of the earth?
Weight equals mass times the acceleration due to gravity, and the acceleration due to gravity on the moon is about one-sixth of its value on the earth because the moon has a much smaller mass and a smaller radius.
Read the full explanation →A barometer is used to measure which of the following?
A mercury barometer balances the pressure of the atmosphere against a column of mercury, which stands about 76 centimetres high at sea level.
Read the full explanation →The universal gravitational constant G was first measured experimentally by
In 1798 Cavendish used a delicate torsion balance to measure the extremely small attraction between lead spheres in a laboratory and from it obtained a value of G, about 6.674 times ten to the power minus eleven newton metre squared per kilogram squared.
Read the full explanation →The pressure exerted by a liquid at a point inside it does not depend upon
The pressure at a point inside a liquid equals the depth multiplied by the density of the liquid and by the acceleration due to gravity.
Read the full explanation →An astronaut inside a spacecraft orbiting the earth feels weightless because
In orbit the gravitational pull of the earth is the very force that keeps the craft curving around the planet, and the craft, the astronaut and everything inside accelerate towards the earth at the same rate.
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