Ruby is primarily made of:
- A) Pure rubidium
- B) Aluminium oxide with chromium
- C) Silicon dioxide
- D) Calcium carbonate
The speed of sound is highest in:
- A) Air at 0 °C
- B) Water at 25 °C
- C) Steel (or solids in general)
- D) Vacuum
When a ball is thrown vertically upwards, acceleration due to gravity is:
- A) 9.8 m/s² downward
- B) 9.8 m/s² upward
- C) Zero at the top
- D) Variable
The theory of evolution by natural selection was proposed by:
- A) Louis Pasteur
- B) Charles Darwin
- C) Robert Koch
- D) Gregor Mendel
Insects breathe through tiny openings called:
[Image of insect spiracles respiratory system]- A) Spiracles
- B) Trachea only
- C) Gills
- D) Lungs
The proton was discovered by:
- A) Ernest Rutherford
- B) J.J. Thomson
- C) Chadwick
- D) Bohr
An adult human has how many bones?
- A) 200
- B) 201
- C) 206
- D) 208
The acid present in ant stings is:
- A) Formic acid
- B) Acetic acid
- C) Citric acid
- D) Tartaric acid
Dr. Abdus Salam received the Nobel Prize for work on:
- A) Strong nuclear force
- B) Electroweak unification
- C) Gravity
- D) Quantum mechanics
Thomas Edison is most famously credited with inventing the practical:
- A) Electric motor
- B) Incandescent light bulb
- C) Telephone
- D) Phonograph only
To give an uncharged object a negative charge, we should:
- A) Remove protons
- B) Add protons
- C) Add electrons
- D) Remove neutrons
Polio vaccine was developed by:
- A) Alexander Fleming
- B) Louis Pasteur
- C) Jonas Salk
- D) Edward Jenner
Anemometer measures:
- A) Wind speed
- B) Air pressure
- C) Humidity
- D) Temperature
Vitamin D is primarily obtained from:
- A) Citrus fruits
- B) Sunlight exposure
- C) Green vegetables
- D) Milk only
The thinnest layer of the Earth is the:
[Image of earth layers crust mantle core]- A) Mantle
- B) Crust
- C) Outer core
- D) Inner core
The atomic number of oxygen is:
- A) 7
- B) 8
- C) 9
- D) 10
Rusting of iron is a process of:
- A) Reduction
- B) Oxidation
- C) Decomposition only
- D) Substitution
The first step in petroleum refining is:
[Image of fractional distillation of petroleum]- A) Cracking
- B) Distillation
- C) Reforming
- D) Polymerization
Diamond is an allotrope of:
- A) Carbon
- B) Silicon
- C) Sulphur
- D) Phosphorus
The reaction in nuclear reactors or atomic bombs is:
- A) Fusion
- B) Fission
- C) Combustion
- D) Neutralization
The study of stars is called:
- A) Astrology
- B) Astronomy
- C) Meteorology
- D) Cosmology
Silicon is widely used in making:
- A) Solar cells and transistors
- B) Batteries
- C) Optical fibres
- D) LEDs only
The basic building block of all living organisms is the:
- A) Cell
- B) Chromosome
- C) Nucleus
- D) Tissue
The thyroid gland mainly secretes:
[Image of thyroid gland anatomy]- A) Thyroxine
- B) Insulin
- C) Adrenaline
- D) Estrogen
Energy possessed by an object due to its position or height is:
- A) Kinetic energy
- B) Potential energy
- C) Thermal energy
- D) Chemical energy
The most penetrating radiation is:
- A) Alpha
- B) Beta
- C) Gamma
- D) X-ray
Isotopes of an element have the same number of:
[Image of isotopes of hydrogen]- A) Protons
- B) Neutrons
- C) Electrons
- D) Nucleons
Which acid is mainly used in food fermentation?
- A) Sulphuric acid
- B) Lactic acid
- C) Citric acid
- D) Acetic acid
The hydrogen bomb works on the principle of:
- A) Nuclear fusion
- B) Nuclear fission
- C) Chemical explosion
- D) Radioactive decay
Humidity refers to the amount of:
- A) Dust in air
- B) Water vapour in air
- C) Oxygen in air
- D) Carbon dioxide in air
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