Physics - Study Mode

[#546] The term ''equinox' means
Correct Answer

(C) When the day and night are of equal duration

Explanation

Solution: The time when the sun crosses the plane of the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (vernal equinox, or spring equinox ) and September 22 (autumnal equinox).

[#547] If the earth suddenly stop rotating, the value of "g" will be
Correct Answer

(B) Increase

Explanation

Solution: If the earth stops rotating then the value of 'g' at equator will increase because when the earth rotates the gravity at every point remains uniform and when it stops rotating, the gravity increases as pressure is exerted on only one point at the equator.

[#548] If an empty cylinder is half filled with a liquid, its center of gravity is
Correct Answer

(B) Shifted downwards

Explanation

Solution: If an empty cylinder is half filled with a liquid, its center of gravity is shifted downwards.

[#549] Temperature of distant luminous bodies can be determined by
Correct Answer

(C) Pyrometers

Explanation

Solution: A pyrometer is a type of remote-sensing thermometer used to measure the temperature of a surface. It is a device that from a distance determines the temperature of a luminous surface from the spectrum of the thermal radiation it emits, a process known as pyrometry.

[#550] The three famous law of Kepler is related to
Correct Answer

(D) Planetary Motion

Explanation

Solution: The three famous law of Kepler is related to planetary motion.