General Science Questions (MCQs) For Competitive Exams

This section contains various important general science questions for competitive exams. Solve these best questions to check and enhance your level of preparation for competitive exams.

MCQs On General Science for competitive Exams

In the section given below, you will find many MCQs on general science. Click on the button present below each question to show the answer.

What is the SI unit of electric current?

  1. Candela
  2. Ampere
  3. Pascal
  4. Mole


The most abundant gas in atmosphere is:

  1. Nitrogen
  2. Oxygen
  3. Carbon dioxide
  4. Argon

Nitrogen. Of all the gases present in the atmosphere, the most abundant is Nitrogen (78%) followed by Oxygen (21%), then by Argon (0.9%) and Carbondioxide (0.03%).

The atomicity of Helium is:

  1. 1
  2. 2
  3. 3
  4. 4

1. Atomicity refers to the number of atoms in the molecules of an element. Since, Helium is an inert gas, therefore it does not react with other helium atoms. Owing to this reason, it exists as a single atom and therefore its atomicity is one

Which vitamin is also known as Thiamine?

  1. Vitamin C
  2. Vitamin B1
  3. Vitamin D
  4. Vitmain K

Vitamin B1

What is the audible sound range for human beings?

  1. 20 Hz to 2000 Hz
  2. 20 Hz to 200 KHz
  3. 20 Hz to 20 KHz
  4. 20 Hz to 20000 KHz

20 Hz to 20 KHz

Which of the following quantities is neither a scalar nor a vector quantity.

  1. Momentum
  2. Electric Current
  3. Speed
  4. Accelaration

Electric current

The process of breaking down of molecules in absence of oxygen is known as:

  1. Apoxia
  2. Hypoxia
  3. Aerobic respiration
  4. Anaerobic respiration

Anaerobic respiration

Eutrophication leads to:

  1. Algal death
  2. Algal bloom
  3. Algal senescence
  4. none of the above

Algal bloom. Eutrophication is the process by which an entire body of water, or parts of it, becomes progressively enriched with minerals and nutrients. Due to eutrophication, Algae enjoy a luxurious growth and this phenomenon is known as Algal Bloom

The plants that grow in shade are known as:

  1. Sciophytes
  2. Heliophytes
  3. Xerophytes
  4. Shadophytes

Sciohytes. Scio means shade and phytes means plants. SO the plants that love shade are called sciophytes. Similarly Heli means Sun and Phytes means plants. So the plants that love sunlight are called Heliophytes. In the same way, Xer means Dry or desertic and phytes means plants, so the plants growing in desertic conditions are called xerophytes.

Which of the following has the lowest frequency in an electromagnetic spectrum?

  1. Infra red rays
  2. Radio waves
  3. Micro waves
  4. Gamma Rays

Radio waves. Electromagnetic spectrum can be remembered as GXUVIMR, where G= Gamma rays, X= Xrays, U= ultraviolet rays, V=visible rays, I= infrared rays, M=micro wwaves, R=radio waves. The frequency and energy decreas from G to R, while as the wavelength increases from G to R.

Which of the following is not required for photosynthesis?

  1. Water
  2. Sunlight
  3. Carbondioxide
  4. Chloroform

Chloroform. There are 4 essential ingredents for photosynthesis to occur. They are water, sunlight, carbondioxide and chlorophyll

Which cell organelle is known as “Power House of Cell”?

  1. Chloroplasts
  2. Lysosomes
  3. Mitochondria
  4. Ribosomes

Mitochondria are called the power house of cell. Chloroplasts are the organalles where photosynthesis occurs and Ribosomes are the cell organalles where protein synthesis occurs. Lysosomes are called the suicidal bags of a cell

Which law says that “to every action, there is equal and opposite reaction”?

  1. Newtons first law
  2. Keplers first law
  3. Newtons third law
  4. Keplers third law

Newtons third law. According to Newton’s third law of motion, for every action, there is equal and opposite reaction. The kepler’s laws are related to the motion of planets around stars, so they are also known as laws of planetary motion and none of them says that to every action, there is equal and opposite reaction

The property of existence of two or more different physical forms of a chemical element is known as:

  1. Polymorphism
  2. Allotropy
  3. Ketotropy
  4. Pleiotropy


To balance a chemical equation, which of the following principles must be conserved:

  1. Principle of conservation of mass
  2. Principle of conservation of momentum
  3. Principle of conservation of energy
  4. Principle of conservation of angular momentum

Principle of conservation of mass must be followed. The other three principles are related to motion and while balancing a chemical equation, we dont take them into account.

Vitamin E is particularly important for:

  1. Development of teeth.
  2. Carbohydrate metabolism.
  3. Normal activity of sex glands.
  4. General health of epithelial tissue.

Normal activity of sex glands.

Which of the following is a deficiency disease?

  1. Asthma
  2. Jaundice
  3. Scurvy
  4. Cancer

Scurvy. It is caused by the defeciancy of Vitamin C

Deficiency of Vitamin D causes:

  1. Beri Beri
  2. Rickets
  3. Pellagra
  4. Scurvy


How many canine teeth are there in an adult human being?

  1. 2
  2. 4
  3. 6
  4. 8

4 The dental formulla for human beings is (2,1,2,3)x4

Which of the following is a vitamin?

  1. Keratin
  2. Biotin
  3. Insulin
  4. Adrenaline


The organ which stores carbohydrates as glycogen in human body is:

  1. Intestine
  2. Stomach
  3. Pancreas
  4. Liver


A man with colour blindness will see red as:

  1. Yellow
  2. Blue
  3. Green
  4. Violet


Which vitamin deficiency causes pernicious anemia?

  1. Vitamin B1
  2. Vitamin B12
  3. Vitamin B6
  4. Vitamin C

Vitamin B12

Which is known as the “immovable property” in the cell?

  1. Carbohydrate
  2. Fat
  3. Protein
  4. Nucleic Acid

Nucleic Acid

Deficiency of Iodine leads to:

  1. Hyperthyroidism
  2. Goitre
  3. Midgut
  4. Diabetes


Saprophytes get their food from:

  1. living plants
  2. living animals
  3. dead and decaying material
  4. inorganic chemical compunds

dead and decaying materials

Too much consumption of tea or coffee can lead to the deficiency of:

  1. Vitamin B12
  2. Calcium
  3. Vitamin C
  4. Albumin


Amino acids are used for the synthesis of:

  1. Alkaloids
  2. Lipids
  3. Proteins
  4. Carbohydrates


What is the SI unit of the power of the lens?

  1. watt
  2. dioptre
  3. metre
  4. per newton


What is the chemical formula for Methane?

  1. CH4
  2. C2H6
  3. C3H8
  4. C4H12


Bile is stored in:

  1. Mouth
  2. Liver
  3. Gall Bladder
  4. Stomach


Which vitamin is synthesized by sunrays in our body?

  1. Vitamin D
  2. Vitamin C
  3. Vitamin A
  4. Vitamin B

Vitamin D. This is the reason why Vitamin D is also known as sunshine vitamin

The longest part of our alimentary canal is:

  1. Large intestine
  2. Small intestine
  3. Liver
  4. Oesophagus

Small Intestine

Which lens acts as a converging lens?

  1. Concave lens
  2. Convex lens
  3. Both
  4. None

Convex lens

Lemon is sour due to the presence of:

  1. Tartaric acid
  2. Ascorbic acid
  3. Acetic acid
  4. Citric acid

Citric acid

Which gas is also known as Marsh gas?

  1. Methane
  2. Ethane
  3. Butane
  4. Propane


Who discovered magnetic effects of electric current?

  1. Max Plank
  2. Einstein
  3. Maxwell
  4. Oerested


Animal Starch means:

  1. Cellulose
  2. Glucose
  3. Chitin
  4. Glycogen


Full form of DDT is:

  1. Dichloro DiVinyl Tri-Chloro-propane
  2. DiFluro Diphenyl Tri-Chloro-propane
  3. Dichloro Diphenyl Tri-Chloro-Ethane
  4. DiFluro Diphenyl Tri-Chloro-propane

Dichloro Diphenyl Tri-Chloro-Ethane

Lactose is present in:

  1. Grapes
  2. Milk
  3. Lime
  4. Milk of Magnesia


The chemical formula for “Milk Of Magnesia” is:

  1. Mg(OH)2
  2. Ca(OH)2
  3. K(OH)2
  4. Na(OH)2


The gas used in artificial ripening of fruits is:

  1. Acetylene
  2. Ethane
  3. Propylene
  4. Propane


Which of the following is used as a shaving mirror?

  1. Convex lens
  2. Concave lens
  3. Concave mirror
  4. Convex mirror

Concave mirror

Which gas is used in LPG cylinder for detecting leakage?

  1. Propane
  2. Ethyl Mercaptan
  3. Acetylene gas
  4. Calcium Carbide

Ethyl Mercaptan

A passenger in a moving train tosses a coin upward, and it just comes back to his hand. It means that the train:

  1. Is accelerated.
  2. has uniform motion.
  3. has uniform acceleration.
  4. has negative acceleration.

has uniform motion. If the train was accelerating, the coin would fall behind the person

Nautical Mile is a unit of distance used in:

  1. Navigation
  2. Astronomy
  3. Sound
  4. measuring the boundaries of nations.


1 Nautical Mile is equal to:

  1. 1.652 Km
  2. 1.852 Km
  3. 1. 452 km
  4. 1.252 km


These were some general science questions (MCQs) for competitive exams. We are sure that you will find these MCQs on general science very useful and hope that you will share them with your friends.

Also Check: Vitamins, All Concepts and MCQs

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