INSIGHT UPSC QUIZ

 In the context of nature of light, read the following statements carefully: 

1. Light does not travel in the same direction in all mediums. 

2. Light propagates with different speeds in different mediums. 

3. Light travels fastest in air with speed of 3×10⁸ m/s. 

4. Speed of light reduces considerably in glass or water.

Which of the statements given above is/are correct?

Which of the following phenomena are caused due to ‘atmospheric refraction’?

1. Flickering of objects seen through a turbulent stream of hot air rising above a fire.

2. The reddening of the sun at sunrise and the sunset.

3. The apparent flattening of the Sun’s disc at sunrise and sunset.

4. The Sun is visible to us about 2 minutes before the actual sunrise, and about 2 minutes after the actual sunset.

Select the correct answer using the code given below.

 Which of the following statement(s) about Acquired Immuno Deficiency Syndrome (AIDS) is/are correct?

1. AIDS is a congenital disease caused by a retrovirus known as Human Immuno deficiency Virus (HIV).

2. AIDS is characterised by a progressive decrease in the number of T-lymphocytes in the body of the infected person. 

Select the correct answer using the code given below.

According to Archimedes’ principle - When a body is immersed fully or partially in a fluid, it experiences an upward force that is equal to the weight of the fluid displaced by it. Which among the following are based on the application of this principle?

1. Ships

2. Lactometer

3. Thermometer

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 Weeds are unwanted plants in a cultivated field. In this context, consider the following statements:

1. The weeds compete for food, space and light.

2. Weeds are responsible for affecting the growth of the crop.

3. Timely sowing of crops and crop rotation help in weed control.

Which of the statement(s) given above is/are correct?

 Consider the following statements:

1. Some substances like carbon dioxide or oxygen can move across the cell membrane by a process called Osmosis. 

2. In the cell’s external environment, the concentration of carbon dioxide is low as compared to that inside the cell.

Which of the statement(s) given above is/are correct?

Consider the following statements about ‘rainbow’:

1. It is caused by dispersion of sunlight by tiny water droplets present in the atmosphere. 

2. A rainbow is always formed in a direction opposite to that of the Sun.

Which of the statements given above is/are correct?

1. Which of the following statement(s) in the context of ‘Human Eye’ is/are NOT correct?

1. Most of the refraction of the light rays entering the eye occurs at the outer surface of the crystalline lens.

2. Iris is a dark muscular diaphragm that controls the size of the pupil. 

3. Pupil regulates and controls the amount of light entering the eye. 

4. Retina is a delicate membrane having enormous number of light-sensitive cells.

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Which among the following are the characteristic features of birds?

1. They are cold-blooded animals.

2. They lay eggs.

3. Two forelimbs are modified for flight.

4. They breathe through lungs.

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 In context of ‘Scrub Typhus’, which of the statements given below is/are correct?

1. It is a disease caused by a bacterium and it spreads to people through bites of infected chiggers.

2. Antibiotics are most effective form of medicine to cure this disease.

3. Recently, a special vaccine has been developed for its prevention by the Department of Biotechnology.

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