Explore topic-wise MCQs in GK.

This section includes 69 Mcqs, each offering curated multiple-choice questions to sharpen your GK knowledge and support exam preparation. Choose a topic below to get started.

1.

A radio-active substance has a half life of six months. Three-fourth of the substance will decay in____.
A. Six months
B. Ten months
C. Twelve months
D. Twenty four months
Answer» D. Twenty four months
Discussion
2.

The catalyst is a substance through which the rates of chemical reactions ________.
A. Decreases
B. Changes
C. Increases
D. None of these
Answer» D. None of these
Discussion
3.

Neutron was discovered -
A. Chadwick
B. Newton
C. Rutherford
D. Thomson
Answer» B. Newton
Discussion
4.

Who was the inventor of positron?
A. Chadwick
B. Anderson
C. Rutherford
D. J.J. Thomson
Answer» C. Rutherford
Discussion
5.

Which of the following has low density and low melting point?
A. Na
B. Fe
C. Cu
D. Au
Answer» B. Fe
Discussion
6.

.______ is least reactive element belonging to group 17.
A. Bromine
B. Iodine
C. Chlorine
D. Fluorine
Answer» C. Chlorine
Discussion
7.

Which of the below allotropes of carbon is in the form of geodesic globe?
A. Fullerene
B. Carbon nanotube
C. Graphite
D. Diamond
Answer» B. Carbon nanotube
Discussion
8.

In which of the following classifications are the elements arranged in the order of their increasing atomic number?
A. The Modern Periodic Table
B. Mendeleev's Periodic Table/
C. Newland's Law of Octaves
D. Dobereiner's Triads
Answer» B. Mendeleev's Periodic Table/
Discussion
9.

Which of the following is not a Green House gas?
A. Nitrous oxide
B. Nitrogen
C. Methane
D. Carbon dioxide
Answer» C. Methane
Discussion
10.

The percentage of nitrogen present in ammonium sulphate is:

A. $$ 30.5 % $$
B. $$ 18 % $$
C. $$ 21 % $$
D. $$ 25 % $$
Answer» D. $$ 25 % $$
Discussion
11.

Which of the following gases turn lime water milky?
A. Carbon Dioxide
B. Oxygen
C. Nitrogen
D. Hydrogen
Answer» B. Oxygen
Discussion
12.

Which of the following has the least melting point?
A. Carbon
B. Silver
C. Mercury
D. Gold
Answer» D. Gold
Discussion
13.

What is the common name of CaoCl2?
A. Washing Soda
B. Bleaching Powder
C. Baking Powder
D. Baking Soda
Answer» C. Baking Powder
Discussion
14.

How are 'anions' formed?
A. Addition of electron
B. Removal of electron
C. Addition of proton
D. Removal of proton
Answer» B. Removal of electron
Discussion
15.

The coil in a heater is made of
A. Nichrome
B. Tungsten
C. Copper
D. Iron
Answer» B. Tungsten
Discussion
16.

Soda lime is a mixture of
A. NaOH + CaCO3
B. NaOH + CaO
C. NaOH + HOH
D. None of these
Answer» C. NaOH + HOH
Discussion
17.

The atomic mass of an element has the maximum number of electrons in its second orbit

A. 2
B. 8
C. 10
D. 16
Answer» C. 10
Discussion
18.

Which of the following is not necessary for photosynthesis?
A. Oxygen
B. Chlorophyll
C. Sunlight
D. Carbon dioxide
Answer» B. Chlorophyll
Discussion
19.

The melting point of tungsten is____.
A. 3,083 C
B. 3,830 C
C. 3,380 C
D. 3,308 C
Answer» D. 3,308 C
Discussion
20.

Who proposed the word 'molecule'?
A. E. Rutherford
B. J.J. Thomson
C. Democritus
D. John Dolton
Answer» D. John Dolton
Discussion
21.

Which of the following is not correct about diffusion?
A. The rate of diffusion of gases is higher than that of solid and liquid.
B. Diffusion is possible only when the particles of matter are in constant motion.
C. The rate of diffusion of gases depends on their volume.
D. Particles in diffusion move from high concentration to low concentration.
Answer» D. Particles in diffusion move from high concentration to low concentration.
Discussion
22.

The basis of classification of elements in modern periodic table is based on___.
A. Atomic number
B. Atomic mass
C. Atomic volume
D. Atomic density
Answer» B. Atomic mass
Discussion
23.

Horizontal columns are called in the Periodic table.
A. Periodic
B. Class
C. Electrical chemical sequence
D. Non-metal
Answer» B. Class
Discussion
24.

Alkali metal can
A. Be highly unstable at room temperature
B. vaporize at room temperature
C. easily lose electrons
D. easily gain electrons
Answer» D. easily gain electrons
Discussion
25.

What are the main components of Brass Alloy?
A. Copper and Zinc
B. Copper, Zinc and Nickel
C. Copper and Strontium
D. Copper and Nickel
Answer» B. Copper, Zinc and Nickel
Discussion
26.

Which gas is mostly present in Venus atmosphere?
A. Hydrogen
B. Carbon Dioxide
C. Helium
D. Nitrogen
Answer» C. Helium
Discussion
27.

'Every substance in the world is made up of very fine particles.' Who said this first?
A. Dalton
B. Kanad
C. Rutherford
D. Avogadro
Answer» B. Kanad
Discussion
28.

In the nucleus of Helium,
A. four protons
B. four neutrons
C. two neutrons and two protons
D. four protons and two electrons
Answer» D. four protons and two electrons
Discussion
29.

What happens in most toothpastes to prevent tooth decay?
A. Bromide
B. Fluoride
C. Iodide
D. Chloride
Answer» C. Iodide
Discussion
30.

Which of the following is not a normal salt?
A. $$ {Na_2SO_4}$$
B. $$ {NaHSO_4}$$
C. $$ {Na_3PO_4}$$
D. $$ {CaSO_4}$$
Answer» C. $$ {Na_3PO_4}$$
Discussion
31.

Solutions having the same osmotic pressure at a given temperature are called_____.
A. hypertonic solution
B. hypotonic solution
C. colloidal solution
D. Isotonic solution
Answer» E.
Discussion
32.

Which is not a property of Ionic bond?
A. Gain of electrons
B. Losses of electrons
C. Transfer of electrons
D. Sharing of electrons
Answer» E.
Discussion
33.

Which of the following laws suggest a direct relationship between Temperature and Volume of a gas?
A. Avogadro rule
B. Charles rule
C. Boyle rule
D. None of these
Answer» C. Boyle rule
Discussion
34.

Emulsion is a dispersion of ____.
A. Gas in Gas
B. Solid in Solid
C. Liquid in Liquid
D. All of these
Answer» D. All of these
Discussion
35.

The general name of the elements of 17th group are
A. Metals
B. Noble gases
C. Transition elements
D. Halogens
Answer» E.
Discussion
36.

Gold is alloyed with which metal to make it harder?
A. C
B. Sn
C. Cu
D. Ag
Answer» D. Ag
Discussion
37.

Isotopes of an element do not have ______.
A. Same number of electrons
B. Same number of protons
C. Same chemical properties
D. Same physical properties
Answer» E.
Discussion
38.

The stranger gas is also known as___________.

A. Helium
B. Argon
C. Xenon
D. Neon
Answer» D. Neon
Discussion
39.

Which carbohydrate is used in silvering of mirrors?
A. Glucose
B. Starch
C. Fructose
D. Sucrose
Answer» B. Starch
Discussion
40.

Which of the following is not nucleon?
A. Proton
B. Neutron
C. Both (A) and (B)
D. Positron
Answer» E.
Discussion
41.

The chemical name of limestone is?

A. Sodium Chloride
B. Sodium Sulphide
C. Calcium carbonate
D. Magnesium Chloride
Answer» D. Magnesium Chloride
Discussion
42.

In atom, neutron was discovered by

A. Rutherford
B. Newton
C. J.J . Thomson
D. Chadwick
Answer» E.
Discussion
43.

The atoms, in which the number of Protons is same but the number of neutrons is different, are known as

A. Isotones
B. Isotopes
C. Isobars
D. Isomers
Answer» C. Isobars
Discussion
44.

The atomic nucleus was discovered by

A. Einstein
B. Thompson
C. Rutherford
D. Dalton
Answer» D. Dalton
Discussion
45.

The flavor of apple is mainly due to which one of the following?

A. Ethanol
B. Acetone
C. Formalin
D. Benzene
Answer» B. Acetone
Discussion
46.

Kerosene oil rises up in the wick of lantern because of

A. The gravitational pull of the wick
B. Surface tension
C. Buoyant force of air
D. Diffusion of the oil through the wick
Answer» C. Buoyant force of air
Discussion
47.

Halogens are belonging to:
A. Group17
B. Group 8
C. Group 18
D. Group 7
Answer» B. Group 8
Discussion
48.

During uniform motion of an object along a straight line, its ___________ remains constant with time.
A. acceleration
B. velocity
C. force
D. deceleration
Answer» C. force
Discussion
49.

Burning of Hydrogen produces

A. Soil
B. Water
C. Oxygen
D. Ash
Answer» C. Oxygen
Discussion
50.

Baking soda is

A. Sodium Sulphate
B. Sodium Hydroxide
C. Sodium Chloride
D. Sodium Bicarbonate
Answer» E.
Discussion