General Science GK Quiz for Competitive Exams

The internal structures of the eye consist of three layers of tissue arranged concentrically: The sclera and cornea make up the exterior layers. The uvea is the vascular layer in the middle, subdivided into the iris, ciliary body, and choroid. The retina constitutes the innermost layer and is made up of nervous tissue.

The hinge joints of the body include the elbow, knee, interphalangeal (IP) joints of the hand and foot and the tibiotalar joint of the ankle.

Epithelial tissue and connective tissues are tissues that have the greatest capacity to regenerate.

The eyes of frogs are protected by a nictitating membrane.

As a result, the Sun appears to be raised above the horizon and we are able to see the Sun 2 minutes before the actual sunrise. Same phenomenon occurs during sunset, i.e., we can see the Sun 2 minutes after the actual sunset. Thus, the time difference between actual sunset and the apparent sunset is about 2 minutes.

The correct answer is Mass. Mass is a quantitative measure of inertia, a fundamental property of all matter. It is the resistance that a body of matter offers to a change in its speed or position upon the application of a force. Mass is represented by the ratio of momentum and velocity of the body.

Everything is pulled towards center of the Earth because of the force of gravity. Gravity is an invisible pull which attracts the objects towards the center of a planet.

Light-year is the unit of length to measure large distances (astronomical distances).

The total distance travelled by light in 1 year is called 1 light year.

1 light-year = 9.46 × 1012 km.

Explanation for the incorrect options

The second (sec) is the unit of time.

A kg is the unit of mass.

Therefore, the Light year is the unit of distance. So, option (D) is correct.

Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.