Everyday Science MCQs

59 Questions
41
Medium fpsc ppsc nts

Which gas law states that pressure and volume of a gas are inversely proportional at constant temperature?

  • A Boyle's law
  • B Charles's law
  • C Gay-Lussac's law
  • D Avogadro's law
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Correct Answer: Option A — Boyle's law
Explanation: Boyle's law states that at constant temperature the pressure of a gas is inversely proportional to its volume meaning increased pressure results in decreased volume and vice versa.
42
Medium fpsc ppsc nts

Which principle explains the lift generated by an aircraft wing due to differences in air pressure?

  • A Pascal's law
  • B Bernoulli's principle
  • C Archimedes' principle
  • D Boyle's law
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Correct Answer: Option B — Bernoulli's principle
Explanation: Bernoulli's principle explains that faster moving air over an aircraft wing creates lower pressure compared to slower air beneath generating the lift needed for flight.
43
Medium fpsc ppsc nts

Which scientific principle explains why objects float or sink in a fluid?

  • A Archimedes' principle
  • B Pascal's law
  • C Bernoulli's principle
  • D Newton's law
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Correct Answer: Option A — Archimedes' principle
Explanation: Archimedes' principle states that an object submerged in a fluid experiences an upward buoyant force equal to the weight of fluid displaced determining whether it floats or sinks.
44
Medium fpsc ppsc nts

Which law explains the equal and opposite reaction observed when a rocket launches?

  • A Newton's first law
  • B Newton's second law
  • C Newton's third law
  • D Law of conservation of energy
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Correct Answer: Option C — Newton's third law
Explanation: Newton's third law states that for every action there is an equal and opposite reaction explaining how a rocket is propelled forward by expelling gases backward at high speed.
45
Medium fpsc ppsc nts

Which law of motion explains why passengers lurch forward when a moving bus suddenly stops?

  • A Newton's first law
  • B Newton's second law
  • C Newton's third law
  • D Law of gravitation
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Correct Answer: Option A — Newton's first law
Explanation: Newton's first law of inertia explains that passengers continue moving forward when a bus suddenly stops because objects in motion tend to remain in motion unless acted upon by an external force.
46
Medium fpsc ppsc nts

Which element is the primary component of natural gas used for cooking and heating?

  • A Propane
  • B Methane
  • C Butane
  • D Ethane
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Correct Answer: Option B — Methane
Explanation: Methane is the primary component of natural gas commonly used for cooking and heating due to its high combustion efficiency and widespread availability through pipeline distribution.
47
Medium fpsc ppsc nts

Which vitamin deficiency commonly causes night blindness in humans?

  • A Vitamin A
  • B Vitamin B1
  • C Vitamin C
  • D Vitamin E
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Correct Answer: Option A — Vitamin A
Explanation: Vitamin A deficiency commonly causes night blindness because this vitamin is essential for producing rhodopsin a pigment in the retina necessary for vision in low light conditions.
48
Medium fpsc ppsc nts

Which vitamin deficiency commonly causes the disease scurvy?

  • A Vitamin A
  • B Vitamin B12
  • C Vitamin C
  • D Vitamin D
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Correct Answer: Option C — Vitamin C
Explanation: Scurvy is caused by a deficiency of Vitamin C which is essential for collagen synthesis and its absence leads to symptoms such as bleeding gums and joint pain.
49
Medium fpsc ppsc nts

Which gland in the human body is often referred to as the master gland because it controls other endocrine glands?

  • A Thyroid gland
  • B Pituitary gland
  • C Adrenal gland
  • D Pancreas
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Correct Answer: Option B — Pituitary gland
Explanation: The pituitary gland is referred to as the master gland because it secretes hormones that regulate the activity of other endocrine glands throughout the human body.
50
Medium fpsc ppsc nts

Which part of the human brain regulates vital involuntary functions such as breathing and heartbeat?

  • A Cerebrum
  • B Cerebellum
  • C Medulla oblongata
  • D Hypothalamus
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Correct Answer: Option C — Medulla oblongata
Explanation: The medulla oblongata located in the brainstem regulates vital involuntary functions including breathing heart rate and blood pressure essential for sustaining basic life processes.
51
Medium fpsc ppsc nts

Which part of the human brain is primarily responsible for controlling balance and coordination?

  • A Cerebrum
  • B Cerebellum
  • C Medulla oblongata
  • D Hypothalamus
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Correct Answer: Option B — Cerebellum
Explanation: The cerebellum located at the back of the brain is primarily responsible for controlling balance posture and fine motor coordination during voluntary muscle movements.
52
Medium fpsc ppsc nts

Which blood type is known as the universal recipient for blood transfusions?

  • A O negative
  • B AB positive
  • C A negative
  • D B positive
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Correct Answer: Option B — AB positive
Explanation: AB positive blood is known as the universal recipient type because it contains both A and B antigens along with the Rh factor allowing it to accept blood from all other types.
53
Medium fpsc ppsc nts

Which blood type is known as the universal donor for blood transfusions?

  • A A positive
  • B AB positive
  • C O negative
  • D B negative
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Correct Answer: Option C — O negative
Explanation: O negative blood is known as the universal donor type because it lacks A B and Rh antigens making it compatible with recipients of nearly any blood type in emergency transfusions.
54
Medium fpsc ppsc nts

Which layer of the atmosphere contains the ozone layer that absorbs harmful ultraviolet radiation?

  • A Troposphere
  • B Stratosphere
  • C Mesosphere
  • D Thermosphere
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Correct Answer: Option B — Stratosphere
Explanation: The stratosphere contains the ozone layer which absorbs most of the sun's harmful ultraviolet radiation protecting living organisms on Earth from excessive UV exposure.
55
Medium fpsc ppsc nts

Which process explains why sweating helps cool the human body?

  • A Conduction
  • B Convection
  • C Evaporation
  • D Radiation
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Correct Answer: Option C — Evaporation
Explanation: Sweating cools the body through evaporation as sweat absorbs heat from the skin and turns into vapor effectively removing thermal energy and lowering body temperature.
56
Medium fpsc ppsc nts

Which household appliance operates on the principle of electromagnetic induction to heat food?

  • A Microwave oven
  • B Induction stove
  • C Electric kettle
  • D Toaster
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Correct Answer: Option B — Induction stove
Explanation: Induction stoves use electromagnetic induction to generate heat directly within ferromagnetic cookware making them more energy efficient than traditional electric or gas stoves.
57
Medium fpsc ppsc nts

Which property of light explains why a straw appears bent when placed in a glass of water?

  • A Reflection
  • B Refraction
  • C Diffraction
  • D Dispersion
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Correct Answer: Option B — Refraction
Explanation: Refraction is the bending of light as it passes from one medium to another with different optical densities causing the straw to appear bent at the water's surface.
58
Medium fpsc ppsc nts

Which type of mirror is commonly used in vehicle side mirrors to provide a wider field of view?

  • A Concave mirror
  • B Convex mirror
  • C Plane mirror
  • D Parabolic mirror
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Correct Answer: Option B — Convex mirror
Explanation: Convex mirrors are used in vehicle side mirrors because they diverge light rays producing a smaller but wider field of view helping drivers see more of their surroundings.
59
Medium fpsc ppsc nts

Which simple machine is used in a pair of scissors?

  • A Lever
  • B Pulley
  • C Wheel and axle
  • D Inclined plane
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Correct Answer: Option A — Lever
Explanation: Scissors function as a compound lever where two blades pivot around a fixed point allowing mechanical advantage to cut through materials with reduced applied force.