Physics - Study Mode

[#1126] What does the slope of a velocity time graph represent?
Correct Answer

(A) Acceleration

Explanation

Solution: The slope of a velocity graph represents the acceleration of the object. So, the value of the slope at a particular time represents the acceleration of the object at that instant.

[#1127] The slope of a velocity-time graph represents
Correct Answer

(A) Acceleration

Explanation

Solution: The slope of a velocity graph represents the acceleration of the object. So, the value of the slope at a particular time represents the acceleration of the object at that instant.

[#1128] Who measured the velocity of light first ?
Correct Answer

(C) Romer

Explanation

Solution: Galileo attempted to record the time between lantern signals but was unsuccessful because the distance involved was too small and light simply moved too fast to be measured this way. Around 1676, Danish astronomer Ole Romer became the first person to prove that light travels at a finite speed.

[#1129] Light houses are places with powerful lights to :
Correct Answer

(D) Guide and warn the ships coming from different directions in the ocean

Explanation

Solution: Light houses are places with powerful lights to guide and warn the ships coming from different directions in the ocean.

[#1130] It is dangerous to observe Solar eclipse with naked eyes because
Correct Answer

(B) Ultraviolet radiations from Sun burn our retina

Explanation

Solution: Exposing your eyes to the sun without proper eye protection during a solar eclipse can cause “eclipse blindness” or retinal burns, also known as solar retinopathy. This exposure to the light can cause damage or even destroy cells in the retina (the back of the eye) that transmit what you see to the brain.