INSIGHT UPSC QUIZ

With reference to the uses of ‘concave mirrors’, read the following statements carefully:

1. They are commonly used in vehicles headlights to get powerful parallel beams of light. 

2. They are often used as shaving mirrors to see a larger image of the face. 

3. They are fitted on the sides of the vehicle to have a wider field of view.

4. Large concave mirrors are used to concentrate sunlight to produce heat in solar furnaces.

Which of the statements given above is/are correct?

Read the following statements carefully:

1. Vector-borne diseases are caused by parasites, viruses and bacteria. 

2. Skin infections are generally caused by different kinds of fungi.

3. Elephantiasis is a disease caused by different species of worms.

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

Consider the following statements: 

1. The ‘danger’ signal lights are red in colour as the red is least scattered by fog or smoke.

2. The sky appears dark to passengers flying at very high altitudes because of scattering of light. 

Which of the statements given above is/are correct?

 The parasitic nutritive strategy, by which some organisms derive nutrition from plants or animals without killing them, is used by which of the following organisms?

1. Cuscuta (amar-bel)

2. Ticks

3. Bread moulds

4. Tape-worms

Select the correct answer using the code given below.

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?

 Consider the following statements about ‘Photochemical Smog’: 

1. It is a phenomenon of cool humid climate. 

2. It occurs when sunlight acts on unburnt hydrocarbons and nitrogen oxides.

3. Ozone in photochemical smog is responsible for the haze. 

Which of the statements given above is/are correct?

The presence of certain minerals is essential in water, however, if found in excess they can be harmful to our body. In this context, which of the following statements are correct?

1. Deficiency of fluoride in drinking water causes diseases such as tooth decay.

2. Excessive sulphate in drinking water causes laxative effect.

3. Excess lead in drinking water can cause disease such as ‘blue baby’ syndrome.

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

Select the correct answer using the code given below:

 With reference to ‘Magnetic Field’, consider the following statements:

1. The magnetic field produced by a current-carrying wire at a given point depends directly on the current passing through it.

2. The magnetic field inside a long straight solenoid-carrying current is zero.

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

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.