General Science

Choose the correct answer: the pH of a neutral solution at 25°C is approximately:

A 1
B 0
C 14
D 7

Select the best answer: the chemical symbol for sodium is:

A Sn
B So
C Na
D S

Which option is correct? the chemical symbol for potassium is:

A P
B Pt
C K
D Po

Identify the correct answer: the most abundant gas in Earth's atmosphere is:

A hydrogen
B oxygen
C carbon dioxide
D nitrogen

For competitive-exam preparation, answer: the basic unit of life is the:

A tissue
B organ system
C organ
D cell

Choose the correct answer: the functional unit of the kidney is the:

A villus
B nephron
C neuron
D alveolus

Select the best answer: photosynthesis mainly occurs in the:

A mitochondrion
B chloroplast
C ribosome
D nucleus

Which option is correct? DNA stands for:

A deoxyribonucleic acid
B deoxygenated nucleic acid
C double nitrogen acid
D dinucleic acid

Identify the correct answer: vitamin C deficiency causes:

A scurvy
B beriberi
C rickets
D night blindness

For competitive-exam preparation, answer: vitamin D deficiency can cause:

A rickets
B scurvy
C beriberi
D pellagra

Choose the correct answer: the largest organ of the human body is the:

A brain
B liver
C lung
D skin

Select the best answer: insulin is produced by the:

A pancreas
B thyroid
C pituitary
D adrenal gland

Which option is correct? red blood cells mainly transport:

A oxygen
B hormones only
C bile
D digestive enzymes

Identify the correct answer: the speed of light in vacuum is approximately:

A 3 × 10^8 m/s
B 3 × 10^6 m/s
C 3 × 10^4 m/s
D 3 × 10^2 m/s

For competitive-exam preparation, answer: which organ pumps blood through the body?

A lung
B heart
C kidney
D liver

In general science, Pascal law refers to:

A heat absorbed or released during a phase change without temperature change
B force opposing relative motion or its tendency between surfaces
C pressure applied to an enclosed fluid is transmitted throughout the fluid
D separation of white light into component colours

Which statement correctly identifies kinetic energy?

A spontaneous emission from unstable nuclei
B unit of energy
C machine converting electrical energy into mechanical energy
D energy due to motion

Which statement correctly identifies frequency?

A increase in dimensions with temperature rise
B number of oscillations per second
C energy associated with position or configuration
D measure related to average kinetic energy of particles

Which of the following is most closely associated with hertz?

A SI unit of frequency
B time for one complete oscillation
C SI unit of electric charge
D large oscillation when driving frequency matches natural frequency

What is the best description of watt?

A change in momentum produced by a force acting over time
B SI unit of power
C ideal oscillating bob suspended by a light string
D production of emf by changing magnetic flux

In general science, nuclear fusion refers to:

A electromagnetic radiation strongly associated with thermal radiation
B semiconductor device that primarily permits current in one direction
C combining light nuclei with energy release
D SI unit of force

Which of the following is most closely associated with magnetic field?

A increase in dimensions with temperature rise
B diverging lens
C sound above about 20 kHz
D region where magnetic forces can act

Which statement correctly identifies pressure?

A time for one complete oscillation
B SI unit of electric current
C force per unit area
D electrostatic force varies with charges and inverse square of distance in vacuum

Which of the following is most closely associated with transformer?

A repetition of sound caused by reflection
B device changing AC voltage through electromagnetic induction
C long-sightedness generally corrected with a convex lens
D change in direction of light when entering another medium

In general science, convection refers to:

A magnet produced by electric current
B heat transfer by bulk movement of a fluid
C opposition to electric current
D device converting light directly into electrical energy