Science Questions & Answers (Compiled from previous question papers)

Science and Technology is an important topic in most of the job examinations conducting by various governmental and nongovernmental recruiting agencies. Innovations are blooming in the areas of medicine, biology, chemistry , aero science etc. Thousands of new ideas, innovations and facts have been adding every day in Science and Technology. To be updated with this latest happenings is very important to perform well in Science and Technology related questions .

We have compiled all the probable questions and answers from Science and Technology giving students a platform not to miss out any question from the topic. Most current developments have been included in our Science and Technology section.Therefore it will definetly be asked in the current affairs section of UPSC,SSC,CDS,PSC examinations. Given below are the questions from Science and Technology from areas of aeroscience,IT,Bio-technology for the coming exams of SSC CGL,PSC and UPSC Prelims.

Biology(435)

Botony(65)

Chemical Engineering(205)

Chemical Technology(7)

Textile Technology(168)

Vitamin(1)

Zoology(109)

Latest Science Questions & Answers

Plants synthesis protein from
starch
sugar
amino acids
fatty acids

Most fish do not sink in water because of the presence of
1. swim bladder
2. air bladder
3. air sacs
4. air in spongy bones
I and II are correct
II and III are correct
III and IV are correct
I, II, III and IV are correct

Photosynthesis generally takes place in which parts of the plant?
Leaf and other chloroplast bearing partsstem and leaf
stem and leaf
Roots and chloroplast bearing parts
Bark and leaf

Movement of cell against concentration gradient is called
osmosis
active transport
diffusion
passive transport

Plants receive their nutrients mainly from
chlorophyll
atmosphere
light
soil

Pollination is best defined as
transfer of pollen from anther to stigma
germination of pollen grains
growth of pollen tube in ovule
visiting flowers by insects

Pine, fir, spruce, cedar, larch and cypress are the famous timber-yielding plants of which several also occur widely in the hilly regions of India. All these belong to
angiosperms
gymnosperms
monocotyledons
dicotyledons

Ozone hole refers to
hole in ozone layer
decrease in the ozone layer in troposphere
decrease in thickness of ozone layer in stratosphere
increase in the thickness of ozone layer in troposphere

Ordinary table salt is sodium chloride. What is baking soda?
Potassium chloride
Potassium carbonate
Potassium hydroxide
Sodium bicarbonate

Which of the mentioned catalyst is used in preparation of synthetic ethanol?

(Process is hydration of ethylene)
Zirconium
Platinum
Phosphoric acid on celite
Phosphoric acid on silica
Explanation:

Synthetic ethanol is made by dehydration of ethylene using phosphoric acid on celite catalyst.

Pyrolsis of CCl₄ will result in which of the mentioned compound?
Perchloroethylene
Trichloroethylene
Dichloroethylene
Hypochlorous acid
Explanation:

Pyrolysis is breaking down of molecules, when two moles of percholoroethylene is taken and pyrolysis is done, it yields perchloroethane and chlorine.

Molecular weight of perchloroethylene is approximately? (Cl-35.5, C-12)
165
166
167
168
Explanation:

Perchloroethane’s formula is C₂Cl₄. Therefore, its weight will be 12*2+35.5*4 = 166.

Which of the mentioned is the simplest method of producing ethylene on large scale?
Thermal cracking of ethane
Deoxidation of ethylene oxide
Dehydration of ethanol
Dehalogenation of Ethyl Chloride
Explanation:

Steam/Thermal cracking if ethane is the easiest and economical means to produce ethylene on large scale, the rest of the reactions are not feasible due to low conversion, However, on laboratory scale ‘c’ can be achieved.

Natural Gas largely constitutes of which of the mentioned?
Ethane
Methane
Butane
Pentane
Explanation:

Methane is one of the major constituents of Natural Gas (about 75%).

What is the capacity of the refinery by Reliance Industry? Where is it located?
10 million ton, Assam
15 million ton, Jamnagar
10 million ton, Ahmedabad
15 million ton, Gandhinagar
Explanation:

Reliance Industry started one of the largest refineries in Jamnagar whose capacity is 15 million ton.

Which of the mentioned can also be a formula of acetic acid?
C2H4O2
C2H4O3
CH4O2
C3H4O
Explanation:

Acetic acid’s formula is CH₃COOH, summing up all Carbons, Hydrogen and Oxygen will result in C₂H₄O₂.

Which of the mentioned names is apt for Acetic Acid?
Methanoic Acid
Ethanoic Acid
Butanoic Acid
Pentanoic Acid
Explanation:

Acetic acid’s formula is CH₃COOH, which consists of acetyl group (Ethanoyl group), So Acetic Acid can also be called as ethanoic acid (presence of 2 carbons).

Identify the organic chemical from the mentioned?
Benzene
Silicates
Aluminates
Sulphur
Explanation:

Benzene’s chemical formula is C₆H₆, which help us, identify it as organic chemical whereas the rest are inorganic, as they don’t posses Carbon, Oxygen, Hydrogen as chief constituents.

Which of the mentioned are the principal constituents of an organic compound?
Carbon, Oxygen and Nitrogen
Carbon, Oxygen and Hydrogen
Carbon, Oxygen and Sulphur
Carbon, Oxygen and Sulphur
Explanation:

Any compound containing Carbon, Hydrogen and Oxygen as principal constituents is an organic compound.

See the green plants in this ocean? That's kelp! Kelp is a plant that grows in the ocean, and provides both food and habitat for many ocean animals. How does the kelp get matter to grow?
from water and air
from soil
from air, water, and soil
from sunlight

The grass on this lawn keeps growing, and so the owner of the house mows the grass. Where do the molecules that grass uses to grow taller come from?
from the soil
from water and air
from nutrients
from nutrients

Two years ago, this plant was only 1 foot tall. Now it is 3 feet tall. Where did the matter for its change in height come from?
from the soil
from water and air
from nutrients
from nutrients

The matter that these flowers use to grow mainly comes from:
air only
water only
air and water only
air, water, and soil

Plants get the matter they need to grow mainly from
Air and Water Only

What is the tube that is also known as your wind pipe?
Trachea
Alveoli
Bronchi
Esophogus

Gas we breathe in
Helium
Oxygen
Carbon

When you breathe, your lungs take in ___ and remove ___.
Oxygen/carbon dioxide
Carbon dioxide/ oxygen

What is the main function of the respiratory system?
To give oxygen and get rid of carbon dioxide for the body
To break down food and absorb nutrients

Veins carry blood with carbon dioxide back to the heart.
False
True