INSIGHT UPSC QUIZ

 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?

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:

 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:

 Compass is an important tool used for navigation since old days. In this context, consider the following statements:

1. The compass needle is a magnet which align itself in a particular direction.

2. The compass needle always points towards the magnetic south pole of the earth.

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

Read the following statements carefully and select the correct answer from codes given below:

1. Working of electric motors involves the electric effect of electric current.

2. Working of electric generators involves the magnetic effect of moving magnets. 

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

With reference to ‘blood’ present in the human body, consider the following statements:

1. It carries oxygen and food to all the cells in human body. 

2. It collects wastes from the cells for disposal. 

3. It is a type of connective tissue. 

Which of the statements given above is/are correct?

Consider the following statements about pesticide residue in our food chain:

1. It is introduced in the food chain by aquatic plants and animals.

2. These chemicals get accumulated progressively at each trophic level. 

3. Human body accumulates minimum concentration of these chemicals.

Select the correct answer using the code given below:

 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 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.

Select the correct answer using the code given below:

Read the following statements carefully in the context of ‘particulate pollutants’?

1. Smoke particulates consist of gaseous or mixture of gaseous and liquid particles formed during combustion of organic matter.

2. Dust is composed of fine solid particles produced during crushing, grinding and attribution of solid materials.

3. Mists are produced by particles of spray liquids and by condensation of vapours in air.

4. Fumes are generally obtained by the condensation of vapours during sublimation, and boiling.

Which of the statements given above are correct?