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Science GK questions 2021 for Competitive Exams



📘Science GK questions 2021 for Competitive Exams🖊️


Q: which metals forms an amalgam with other metals?
(a) Tin
(b) Lead
(c) Mercury
(d) None of these
Ans: Mercury

Q: used in pencils?
(a) Graphite
(b) all of these
(c) Charcoal
(d) None of these
Ans: Graphite

Q: Chemical formula for Benzene is
(a) C6H6
(b) C6H5-CH3
(c) C6H12
(d) C2H2
Ans: C6H6

Q: what is Water density
(a) 1.0 g/cm³
(b) 2.9 g/cm³
(c) 1.5 g/cm³
(d) 1.2 g/cm³
Ans: 1.0 g/cm³

Q: what is Unit of electricity?
(a) kWh
(b) Ohm
(c) Jule
(d) None of these
Ans: kWh

Science GK questions for Competitive Exams
Q: what is Acceleration Formula
(a) a=Time Taken/Change in velocit
(b) Angular speed=total distance traveled/total time taken
(c) a=Change in velocity/Time Taken
(d) None of these
Ans: a= Change in velocity/Time Taken

Q: what is Atomic Formula
(a) Atomic mass = Number of protons – number of neutrons – number of electrons
(b) Atomic mass = Number of protons + number of neutrons – number of electrons
(c) Atomic mass = Number of protons + number of neutrons + number of electrons
(d) None of these
Ans: Atomic mass = Number of protons + number of neutrons + number of electrons

Q: The power of a lens is measured
(a) aeon
(b) diopters
(c) candela
(d) None of these
Ans: Diopters

Q: Who is Father of Modern Chemistry?
(a) Einstein
(b) Antoine Lavoisier
(c) Theophrastus
(d) Mendel
Ans: Antoine Lavoisier

📘Science GK questions for Competitive Exams🖊️


Q: Who invented periodic table in Chemistry?
(a) Dmitri Mendeleev
(b) Alan Emtage
(c) Dennis Ritchie
(d) Tim Berners-Lee
Ans: Dmitri Mendeleev.

Q: What is marsh gas?
(a) Ozone
(b) Ethene
(c) Hydrogen
(d) Methane
Ans: Methane

Q: Which is the simplest sugar ?
(a) Fructose
(b) sucrose
(c) Glucose
(d) None of These
Ans: Glucose

Q: chemical name of Vitamin B3 ?
(a) Retinol
(b) Niacin
(c) Thiamine
(d) None of These
Ans: Niacin

Q: what is fourmula of Ascorbic acid?
(a) Hcl
(b) C6H8O7
(c) C6H8O6
(d) None of These
Ans: C6H8O6

Science GK questions for Competitive Exams
Q: What is Molar mass of Citric acid?
(a) 196.12 g/mol
(b) 176.12 g/mol
(c) 192.124 g/mol
(d) Methane
Ans: 192.124 g/mol

Q: What is laughing gas with formula?
(a) Sulfur dioxide SO2
(b) Carbon monoxide CO
(c) Nitrous Oxide N2O
(d) None of These
Ans: Nitrous Oxide N2O

Q: Diamond is allotropic of
(a) Tin
(b) iron
(c) carbon
(d) None of These
Ans: carbon

Quiz: Which animal lays eggs?
Ans: Duck

Quiz: A male cow is called?
Ans: Ox

Quiz: All animals need food, air, and ____ to survive.
Ans: Water

Quiz: What is Earth’s only natural satellite?
Ans: Moon

Quiz: The tree has a branch filled with green _____.
Ans: Leaves
 

📘Science GK questions for CDS🖊️


Quiz: What part of the body helps you move?
Ans: Muscles

Quiz: What star shines in the day and provides light?
Ans: Sun

Quiz: Legs have feet and arms have ___.
Ans: Hands

Quiz: In which of seasons will you see a rainbow more often?
Ans: Monsoon

Quiz: Which of these grows from a seed?
Ans: Grass

Quiz: which material is got from animals, and is used to make clothes?
Ans: Silk

Quiz: Fuel is used up to give the energy to make things work. Petrol is a type of fuel used in vehicles to make them run. Which of these is also fuel?
Ans: Food eaten by a person

Quiz: Shushila has brown eyes. The following people in her family have brown eyes whom could she have got her brown eyes from?
Ans: Her grandmother

Quiz: Choose the word which can be substituted for the given sentence – A doctor specialised in children and their diseases.
Ans: Cardiologist
 

📘Science GK questions for NDA🖊️


Quiz: Which planet is nearest to Earth?
Ans:Mercury

Quiz: The filament of a light bulb is made up of:
Ans: Tungsten

Quiz: Which of the following coloured light has the lowest frequency?
Ans: Red

Quiz: What is the unit of the magnitude of the weight?
Ans:Force Newton

Quiz: What is the value of Pi?
Ans:3.14159


📘Science Quiz for CDS, SSC, CGL🖊️


Quiz: Identify the pair that is correctly matched?
Ans: Albert Einstein: Photoelectric effect

Quiz: Refraction, Reflection, Dispersion and Diffraction are associated with
Ans: Light

Quiz: Which one of the following is not a part of small intestine?
Ans: Caecum

Quiz: Cell or tissue death within a living body is called as –
Ans: Necrosis

Quiz: Which of the following blood cells is compulsory for blood coagulation?
Ans: Platelets

Quiz: In the human body, Cowper’s glands produce the growth hormone (somatotrophin)?
Ans: Pituitary

Quiz: Cloves, used as a spice, are derived from which of the following plant parts?
Ans:Flower buds

Quiz: Which one among the following kinds of organisms resides in the roots of pulse to do nitrogen fixation?
Ans: Bacteria

Quiz: An organism that transmits disease from one individual to another is called –
Ans: Vector

Quiz: The part of brain which controls mood and anger in our body is
Ans: Hypothalamus

Quiz: To reduce tooth decay most toothpastes contain a –
Ans: Fluoride

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