SSC CHSL 2017 PYQs

Question 1

The process of pollination by birds is also known as

Accepted Answer

Pollination by birds is specifically termed Ornithophily. This term is derived from 'ornithos' meaning bird, and 'philein' meaning to love.

Question 2

Octopus belongs to the phylum

Accepted Answer

Octopus is an invertebrate with a soft body and a mantle, which are defining characteristics of the phylum Mollusca. This makes option 1 correct.

Question 3

Bacteria was discovered by

Accepted Answer

Antonie van Leeuwenhoek is credited with the discovery of bacteria in 1676, observing them through his self-made microscopes.

Question 4

Prawn belongs to the phylum

Accepted Answer

Prawns are invertebrates with an exoskeleton and segmented bodies, which are defining characteristics of the phylum Arthropoda. This is a direct classification fact.

Question 5

Earth-worms belongs to the phylum

Accepted Answer

Earthworms are segmented worms belonging to the phylum Annelida. This phylum includes all segmented worms, characterized by their metameric segmentation.

Question 6

Sea-Anemones belongs to the phylum

Accepted Answer

Sea-Anemones are marine invertebrates characterized by stinging cells, placing them in the phylum Cnidaria. This is a direct recall of biological classification.

Question 7

Equus Caballus is the scientific name of _________.

Accepted Answer

Equus Caballus is the binomial nomenclature for the domestic horse. This is a direct recall of a common scientific name.

Question 8

Which Virus causes Chicken Pox?

Accepted Answer

Chickenpox is caused by the Varicella-zoster virus, which is also known as Herpes Zoster Virus. It's a common childhood infection.

Question 9

Sponges belongs to the phylum

Accepted Answer

Sponges are simple multicellular animals characterized by pores, belonging to the phylum Porifera. This is a direct classification fact.

Question 10

Spiders belong to the phylum

Accepted Answer

Spiders are invertebrates with an exoskeleton, segmented bodies, and jointed appendages, which are defining characteristics of the phylum Arthropoda.

Question 11

Rodentia Sciurus is the scientific name of

Accepted Answer

Rodentia Sciurus is the scientific name for a squirrel. This binomial nomenclature identifies the genus (Sciurus) and order (Rodentia) of the animal.

Question 12

What is the full form of PVC?

Accepted Answer

PVC stands for Polyvinyl Chloride, a widely used synthetic plastic polymer. It is commonly used in pipes, window frames, and electrical cable insulation.

Question 13

Which among the following is false about alpha particles?

Accepted Answer

Alpha particles have low penetrating power due to their large mass and charge, which causes them to interact frequently with matter and lose energy quickly.

Question 14

What does a catalyst do in a reaction?

Accepted Answer

A catalyst provides an alternative reaction pathway with lower activation energy, thereby increasing the reaction rate without being consumed.

Question 15

The mass of proton and mass of which atomic particle is  same?

Accepted Answer

Protons and neutrons have approximately the same mass, which is about 1 atomic mass unit (amu). Electrons are significantly lighter.

Question 16

Which among the following is present inside the nucleus of an atom?

Accepted Answer

The nucleus of an atom contains protons and neutrons. Electrons orbit the nucleus in shells. This is a fundamental concept in atomic structure.

Question 17

Analgesics ________.

Accepted Answer

Analgesics are a class of drugs specifically designed to relieve pain. They work by blocking pain signals or reducing inflammation.

Question 18

Which among the following is an endothermic reaction?

Accepted Answer

Endothermic reactions absorb heat from their surroundings. Sweating cools the body by absorbing heat for evaporation, making it an endothermic process.

Question 19

Release of which among the following is the primary reason for depletion of the ozone layer?

Accepted Answer

Chlorofluorocarbons (CFCs) are the primary chemicals responsible for the depletion of the ozone layer, commonly found in refrigerants and aerosols.

Question 20

Which among the following has the maximum density?

Accepted Answer

Water has maximum density at 4°C. Ice is less dense than water, which is why it floats. Ethylene and Acetone have lower densities.