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?

Consider the following statements about the ‘scattering of light’: 

1. Very fine particles scatter mainly blue light while particles of larger size scatter light of longer wavelengths. 

2. If the size of the scattering particles is large enough, then, the scattered light may even appear white. 

Which of the statements given above is/are correct?

Which of the following diseases and their causative agents is NOT correctly matched? 

Select the correct answer using codes given below:

 With reference to heterotrophic eukaryotic organisms, Fungi, consider the following statements:

1. All fungus are parasites as they use host organism for food.

2. Lichens have a symbiotic relationship of blue-green algae and fungus.

3. Yeasts and mushrooms are varities of fungus.

Select the correct answer using the code given below:

A lemon kept in water in a glass tumbler appears to be bigger than its actual size, when viewed from the sides. This is because of which of the following reasons:

Consider the following statements: 

1. Small intestine is the longest part of the human alimentary canal.

2. Carnivores have a longer small intestine than herbivores.

Which of the statements given above is/are correct?

 Manure contains large quantities of organic matter and also supplies small quantities of nutrients to the soil. In this context, consider the following statements:

1. The organic matter in manure helps in improving the soil structure.

2. It increases the water holding capacity in sandy soils.

3. It causes water logging in clayey soils.

Select the correct answer using the code given below:

Which of the following statements about ‘Sponges’ is/are correct?

1. Sponges are generally marine organisms and are multicellular symmetrical animals. 

2. In sponges, eggs and sperms are produced by the same individual. 

3. Sponges reproduce asexually by formation of gametes and sexually by fragmentation. 

Select the correct answer using the code given below.

 Some countries now use alcohol as an additive in petrol. In context of this, consider the following statements: 

1. Addition of alcohol increases the burning efficiency of petrol and reduces knocking.

2. Petrol added with small quantities of alcohol becomes more stable and doesn’t become too hot in warm areas or too cold in freezing temperatures.

3. Alcohol is a cleaner fuel which gives rise to only carbon dioxide and water on burning in sufficient oxygen.

Which of the statements given above is the correct reason for using alcohol as an additive in petrol?

 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.