All Free Everyday Science MCQs with Answers

1481. Which famous scientist formulated the laws of motion and universal gravitation?

• A. Isaac Newton
• B. Galileo Galilei
• C. Albert Einstein
• D. Nikola Tesla

Explanation: Isaac Newton formulated the three laws of motion and the law of universal gravitation. Galileo influenced the study of motion, while Einstein later developed relativity.

1482. The waves which are used for line of sight (LOS) communication are called:

• A. Space waves
• B. Cable waves
• C. Antenna waves
• D. None of thesePhysics Mcqs

Explanation: Line-of-sight radio communication uses space waves, which travel directly through the lower atmosphere from transmitting to receiving antennas. Cable and so-called antenna waves are not the standard propagation categories.

1483. In the structure of fiber, the light is guided through the core due to total internal:

• A. Reflection
• B. Refraction
• C. Diffraction
• D. None of these

Explanation: Optical fibre guides light by total internal reflection at the boundary between its denser core and less-dense cladding. Refraction changes direction at a boundary, but it is not the guiding principle named here.

1484. Which of the following is a neutral particle ?

• A. Alpha particle
• B. Neutron
• C. Electron
• D. Proton
• E. All of theseExam preparation materials

Explanation: A neutron has no net electric charge, whereas an alpha particle and proton are positive and an electron is negative. Thus only the neutron is neutral among the listed particles.

1485. A chronometer meter measures __________ ?

• A. Water waves
• B. Color contrast
• C. Time
• D. Sound waves

Explanation: A chronometer is a precision instrument for measuring or keeping time, so its measured quantity is time. Water waves and sound waves are physical phenomena, not what a chronometer measures.

1486. The blotting paper helps observe liquid by__________?

• A. Surface Action
• B. Capillary Action
• C. Viscosity
• D. Boldness

Explanation: Tiny pores in blotting paper act like narrow tubes, drawing liquid through them by capillary action. This is why ink or water spreads through the paper without being poured.

1487. The SI unit of charge is __________?

• A. Ampere
• B. Coulomb
• C. Ohm
• D. Volt

Explanation: The coulomb is the SI unit of electric charge, equal to the charge transferred by a current of one ampere in one second. Ampere measures current, while volt measures potential difference and ohm measures resistance.

1488. When water is filled in a bottle and is allowed to freeze, the bottle breaks because

• A. Water expands on freezing
• B. Bottle contracts at freezing point
• C. temperature outside the bottle is less than that inside the bottle.
• D. None of the above

Explanation: Water expands when it freezes because its molecules form an open crystal structure, increasing its volume. The expansion exerts pressure on a rigid bottle until the bottle cracks or breaks.

1489. A tight-rope walker carries a long pole which he holds across his body. The purpose of this pole is to__________?

• A. Prop him up if he falls
• B. Spread out his weight and reduce the pressure on the rope
• C. Add extra weight to keep the rope tightly stretched
• D. To keep the Center of gravity always above vertically above the rope

Explanation: The long pole helps the walker control balance by keeping the combined centre of gravity vertically above the rope. It also increases rotational inertia, giving more time to correct a tilt.

1490. The Beta particles are fast moving___________?

• A. Protons
• B. Electrons
• C. Neutrons
• D. None

Explanation: Beta-minus particles are fast-moving electrons emitted when a neutron changes into a proton. They are therefore different from alpha particles, which are helium nuclei.