Physics - Study Mode

[#471] Parsec is the unit of
Correct Answer

(A) Distance

Explanation

Solution: One parsec is the distance to an object whose parallax angle is one arc second. The radius of the Earth's orbit equals one astronomical unit (AU), so an object that is one parsec distant is 206,265 AU (or 3.26 light-years) away.

[#472] One nanometer is equal to ________ meters.
Correct Answer

(C) 10 raised to the power (-9)

Explanation

Solution: One nanometer is equal to 10 raised to the power (-9) meters.

[#473] The Length of the Day is determined in
Correct Answer

(C) Astronomical units

Explanation

Solution: The length of the day is determined in astronomical units.

[#474] Which of the following pairs of physical quantities have the same dimensions?
Correct Answer

(C) Work and Energy

Explanation

Solution: Work and Energy have the same physical quantities.

[#475] The motion of a body that repeats itself after a regular interval of time is
Correct Answer

(A) A periodic motion

Explanation

Solution: A motion that repeats itself after equal intervals of time is known as periodic motion. Examples of periodic motion are a tuning fork or motion of a pendulum if you analyze the motion you will find that the pendulum passes through the mean position only after a definite interval of time.