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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.

Latest Science Questions & Answers

Plants synthesis protein from
Astarch
Bsugar
Camino acids

Dfatty 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
AI and II are correct

BII and III are correct
CIII and IV are correct
DI, II, III and IV are correct

Photosynthesis generally takes place in which parts of the plant?
ALeaf and other chloroplast bearing partsstem and leaf

Bstem and leaf
CRoots and chloroplast bearing parts
DBark and leaf

Movement of cell against concentration gradient is called
Aosmosis
Bactive transport

Cdiffusion
Dpassive transport

Plants receive their nutrients mainly from
Achlorophyll
Batmosphere
Clight
Dsoil

Pollination is best defined as
Atransfer of pollen from anther to stigma

Bgermination of pollen grains
Cgrowth of pollen tube in ovule
Dvisiting 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
Aangiosperms
Bgymnosperms

Cmonocotyledons
Ddicotyledons

Ozone hole refers to
Ahole in ozone layer
Bdecrease in the ozone layer in troposphere
Cdecrease in thickness of ozone layer in stratosphere

Dincrease in the thickness of ozone layer in troposphere

Ordinary table salt is sodium chloride. What is baking soda?
APotassium chloride
BPotassium carbonate
CPotassium hydroxide
DSodium bicarbonate

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

(Process is hydration of ethylene)
AZirconium
BPlatinum
CPhosphoric acid on celite

DPhosphoric 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?
APerchloroethylene

BTrichloroethylene
CDichloroethylene
DHypochlorous 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)
A165
B166

C167
D168
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?
AThermal cracking of ethane

BDeoxidation of ethylene oxide
CDehydration of ethanol
DDehalogenation 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?
AEthane
BMethane

CButane
DPentane
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?
A10 million ton, Assam
B15 million ton, Jamnagar

C10 million ton, Ahmedabad
D15 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?
AC2H4O2

BC2H4O3
CCH4O2
DC3H4O
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?
AMethanoic Acid
BEthanoic Acid

CButanoic Acid
DPentanoic 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?
ABenzene

BSilicates
CAluminates
DSulphur
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?
ACarbon, Oxygen and Nitrogen
BCarbon, Oxygen and Hydrogen

CCarbon, Oxygen and Sulphur
DCarbon, 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?
Afrom water and air

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?
Afrom the soil
Bfrom water and air

Cfrom nutrients
Dfrom 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?
Afrom the soil
Bfrom water and air

Cfrom nutrients
Dfrom nutrients

The matter that these flowers use to grow mainly comes from:
Aair only
Bwater only
Cair and water only

Dair, water, and soil

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

What is the tube that is also known as your wind pipe?
ATrachea

BAlveoli
CBronchi
DEsophogus

Gas we breathe in
AHelium
BOxygen

CCarbon

When you breathe, your lungs take in ___ and remove ___.
AOxygen/carbon dioxide

BCarbon dioxide/ oxygen

What is the main function of the respiratory system?
ATo give oxygen and get rid of carbon dioxide for the body

BTo break down food and absorb nutrients

Veins carry blood with carbon dioxide back to the heart.
AFalse
BTrue