INSIGHT UPSC QUIZ

If an opaque object on the path of light becomes very small, light has a tendency to bend around it and not walk in a straight line. This effect is known as:

2. Consider the following statements: 

1. Typhoid fever in human beings is caused by a virus. 

2. Plasmodium is a tiny protozoan responsible for causing malaria.

3. Plasmodium enters the human body through the bite of infected female Anopheles mosquito.

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.

Select the correct answer using codes given below:

Desirable characteristics of a crop variety helps in easy adoption of that crop by the farmers. In this context, consider the following statements:

1. Incorporating desirable characters into crop varieties can be done through fertilisation.

2. Dwarfness is desired in cereals, so that less nutrients are consumed by these crops. 

3. Hybridisation refers to crossing between genetically similar plants.

Which of the statement(s) 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:

Match the following pairs with reference to different types of ‘Phyla’ with their most distinctive features:

Select the correct answer using the code given below.

The ‘scattering of light’ is responsible for which of the following phenomena in nature?

1. Tyndall effect.

2. Colour of water in deep sea.

3. Blue colour of the sky.

4. Rainbow formation.

Select the correct answer using the code given below.

Consider the following statements about ‘Acid Rain’: 

1. Oxides of sulphur and nitrogen are major contributors to acid rain.

2. Acid rain is good for agriculture as it provides nitrogen for the growth of plants.

3. When acid rain flows into the river, it increases the pH level of river water. 

Which of the statements given above is/are correct?

 Consider the following statements with reference to the ‘magnetic field’ of a bar magnet:

1. Magnetic field is a quantity that has both direction and magnitude. 

2. Inside the magnet, the direction of field lines is from its south pole to north pole.

3. Magnetic field-lines of two different magnets can intersect each other.

Which of the statement(s) 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?