All Free Everyday Science MCQs with Answers

1491. The alpha particles are compact clusters of______________?

• A. Electron and Proton
• B. Two Protons and two Neutrons
• C. Three protons and three Neutrons
• D. None

Explanation: An alpha particle is the nucleus of a helium-4 atom, containing two protons and two neutrons. It has no electrons, so the first option describes a different combination.

1492. One of these scientists formulated basic laws of Geometry?

• A. Pythagorus
• B. Archimedes
• C. Aristotle
• D. None

Explanation: Pythagoras is traditionally associated with the Pythagorean theorem, a foundational result in geometry relating the sides of a right triangle. Aristotle is primarily associated with philosophy and logic, not the basic laws of geometry.

1493. Coulomb is the scientific unit to measure?

• A. Velocity
• B. Temperature
• C. Mass
• D. None OF These

Explanation: The coulomb is the SI unit of electric charge, equal to the charge transferred by one ampere in one second. None of the listed quantities is measured in coulombs.

1494. For being able to see three-dimensional pictures we have to use_________?

• A. A binocular
• B. A camera
• C. An epidiascope
• D. A stereoscope

Explanation: A stereoscope presents slightly different views to the two eyes, allowing the brain to combine them into a three-dimensional image. A binocular is mainly for viewing distant objects, not specially designed 3-D pictures.

1495. Materials for rain-proof coats and tents owe their water proof properties to________?

• A. Surface tension
• B. Viscosity
• C. Specific gravity
• D. Elasticity

Explanation: Surface tension makes water form droplets and resist spreading across the fibres of a treated coat or tent. Viscosity and specific gravity describe fluid behaviour and density, not waterproofing.

1496. The absorption of ink by blotting paper involves__________?

• A. Viscosity of ink
• B. Capillary action phenomenon
• C. Diffusion of ink through the blotting
• D. Siphon action

Explanation: Blotting paper contains very fine pores, and adhesion plus capillary action draws the ink into these narrow spaces. Siphon action requires a connected liquid column and is not involved here.

1497. Detergents dissolved in water help in cleaning clothes by_________?

• A. Increasing the temperature of water
• B. Reacting chemically with dirt
• C. Reducing the surface tension of water
• D. Dissolving dirt

Explanation: Detergents lower water's surface tension, allowing it to spread through cloth and reach dirt more easily. They also help suspend grease, but the characteristic physical action tested here is reduced surface tension.

1498. The cracking sound heard when dry hair is combed with a hard rubber comb is due to_________?

• A. The hair barging against the charged comb
• B. Small electric sparks
• C. The rubbing of the comb with the hair
• D. None of the above

Explanation: Rubbing the rubber comb against dry hair transfers electric charges to the comb and hair. The sudden discharge of these charges produces tiny sparks and the cracking sound.

1499. Scalding with steam is more severe than scalding by boiling water because_______?

• A. Steam can penetrate the skin
• B. Steam is at a higher temperature
• C. Steam contains more energy than boiling water
• D. Steam is at a higher pressure

Explanation: Steam transfers extra energy when it condenses into water on the skin, releasing its latent heat of vaporization. Therefore steam at the same nominal boiling temperature can cause a more severe burn than boiling water.

1500. Water is a highly effective coolant for a car engine because _________?

• A. Water is good conductor of heat
• B. Water has very high specific heat capacity
• C. Water boils at a comparatively high temperature
• D. Evaporation of water produces lot of cooling

Explanation: Water has a high specific heat capacity, so it absorbs a large amount of engine heat while its own temperature rises relatively slowly. This makes it effective for circulating heat away from the engine.