Challenge Prelims V1.0 – Day 76 – GS Paper (Science and Technology)

1. A person stands on loose sand and then lies down on it. He goes deeper into the sand while standing than while lying down. Which one of the following is the reason?

2. A sound created in a big hall will persist by repeated reflection from the walls until it is reduced to a value where it is no longer audible. The repeated reflection that results in this persistence of sound is called as

3. How many of the following are the potential applications of lasers?

1. It is used to measure the distance between two celestial bodies.
2. It provides information on continental drifting.
3. It detects and measures the pollutants in vehicular exhaust gases.
4. It is used in the barcode scanners.

Select the correct answer using the code given below.

4. What is the direction of conventional current flow in an electrical circuit?

5. The colour of the sun appears reddish during sunset. Which of the following is the reason behind this phenomenon?

6. Which polymer is used in making non-stick cookware, such as Teflon?

7. Consider the following pairs:

Noble Gas: Use

1. Helium: Balloons
2. Krypton: Fog lights
3. Xenon: Anaesthetic

How many of the pairs given above is/are correctly matched?

8. With reference to Benzo(a)pyrene, consider the following statements:

1. It is released due to the incomplete combustion of organic matter.
2. It is found in grilled and smoked meat and fish.
3. It is a monitored pollutant under the National Ambient Air Quality Standards

How many of the statements given above is/are correct?

9. In chemistry, the Octet rule is related to

10. Which of the following statements with reference to allotropes is/are correct?

1. It is the property of some chemical elements to exist in two or more different forms, in the different physical state.
2. Diamond and fullerenes are allotropes of carbon

Select the correct answer using the code given below.

11. Consider the following statements with respect to cell division:

1. Mitotic cell division occurs in somatic cells only and meiosis occurs in germ cells only.
2. All mitotic progeny is genetically similar whereas in meiosis, a new combination of genes is obtained.

Which of the statements given above is/are correct?

12. Consider the following statements:

1. Chloroplasts are green-coloured plastids, which comprise pigments called chlorophyll.
2. Chloroplasts are found in all green plants and algae.

Which of the statements given above is/are correct?

13. How many of the following is/are white blood cells?

1. Neutrophils
2. Lymphocytes
3. Basophils
4. Erythrocytes

Select the correct answer using the code given below.

14. Consider the following pairs with respect to cell organelles and their functions:

Cell organelle: Function

1. Ribosomes: Site for protein synthesis
2. Plasma membrane: Control movement of ions and molecules
3. Golgi apparatus: Modification and sorting of proteins
4. Lysosomes: Cellular digestion

How many of the above pairs are correctly matched?

15. Consider the following pairs with respect to plant growth regulators and their functions:

Growth regulator: Function

1. Auxin: Promotes cell elongation
2. Gibberlin: Induces dormancy of seeds
3. Cytokinins: Prevent aging of plant parts
4. Ethylene: Promotes senescence and abscission of leaf

How many of the above pairs is/are correctly matched?