Questions

Atoms of the same element can differ in

The scientific name of human being is?

In the following question, out of the four alternatives, select the alternative which is the best substitute of the words/sentence.

Interrupt (a public speaker) with derisive or aggressive comments or abuse

Select the word with the correct spelling.

Read the following passage carefully and choose the most appropriate answer to the question out of the four alternatives.

The human eye is a complex part of the body that is used for seeing. Eyes enable people to perform daily tasks and to learn about the world that surrounds them. Sight, or vision, is a rapidly occurring process that involves continuous interaction between the eye, the nervous system, and the brain. When someone looks at an object, what he really sees is the light reflected from the object. This reflected light passes through the lens and falls on the retina of the eye. Here the light induces nerve impulses that travel through the optic nerve to the brain and then over other nerves to muscles and glands.

The eye is similar to a television camera. Both the eye and the television camera convert light energy to electrical energy. The eye converts light to nerve impulses that are interpreted by the brain as the sense perception called sight. A television camera converts light to electronic signals that are broadcast and transformed into light images in a television receiver. It is wonderful that human eyes blink an average of once every six seconds. This washes the eye with the salty secretion from the tear or lachrymal glands. Each tear gland is about the size and shape of an almond. These glands are situated behind the upper eyelid at the outer corner of the eye. After passing over the eye, the liquid from the gland is drained into the nose through the tear duct at the inner corner of the eye.

The average rate of blinking of an eye is

In the following question the 1st and the last part of the sentence/passage are numbered 1 and 6. The rest of the sentence/ passage is split into four parts and named P, Q, R and S. These four parts are not given in their proper order. Read the sentence/passage and find out which of the four combinations is correct.

1. Don't ask what we are doing this time.
P. On other occasions we have time in hand.
Q. It is difficult to say if the programme can be put up at all.
R. This time we are not only facing a lack of time but of resources as well.
S. I am losing confidence gradually, so please see what you can do for us.
6. We don't want to give up trying.

Temperature of distant luminous bodies can be determined by

Which Indian armed force has conducted ‘Exercise Topchi 2019’?