All Free Everyday Science MCQs with Answers

1611. Max plank is famous for his discovery of?

• A. Energy quanta
• B. photon
• C. both of these
• D. None of these

Explanation: Max Planck introduced the idea that energy is emitted or absorbed in discrete packets called quanta. The photon was later proposed as the quantum of electromagnetic radiation, especially through Einstein’s work.

1612. Unit of surface tension in cgs system is?

• A. Pascal
• B. N/m
• C. Dyn/cm
• D. None of these

Explanation: Surface tension has the dimensions of force per unit length, so its CGS unit is dyne per centimetre. Pascal and newton per metre are SI pressure and SI surface-tension units respectively.

1613. Who gave the idea of law of inertia?

• A. Dalton
• B. Galileo Galilei
• C. Bacon
• D. Einstein

Explanation: Galileo developed the principle of inertia through his studies of motion and inclined planes. Newton later stated it formally as the first law of motion.

1614. Which of the following is a positively charged particle emitted by a radioactive element?

• A. Beta Rays
• B. Alpha Rays
• C. Gamma Rays
• D. None of these

Explanation: Alpha radiation consists of positively charged helium nuclei, containing two protons and two neutrons. Beta and gamma radiation have different properties, with gamma rays carrying no charge.

1615. The fastest bird is the Peregrine Falcon, clocked at speeds of up to _____ miles per hour?

• A. 240
• B. 250
• C. 260
• D. 230

Explanation: A peregrine falcon can reach about 240 miles per hour during its high-speed hunting dive, making it the fastest bird by diving speed.

1616. Most gases conduct electricity at:

• A. Normal pressure
• B. Very low pressure
• C. Very high pressure
• D. None of these

Explanation: Most gases become better electrical conductors at very low pressure because energetic electrons can travel farther and ionise more gas molecules. At normal pressure, frequent collisions limit this process.

1617. Refraction of sound can occur in:

• A. Water
• B. Air
• C. Both A & B
• D. None of these

Explanation: Sound changes direction when its speed varies between media or across layers of a medium, so refraction can occur in both air and water.

1618. The frequency of a turning fork determined by a:

• A. Magnetic tape
• B. Modulator
• C. Sonometer
• D. Reed instrument

Explanation: A sonometer determines the frequency of a tuning fork by comparing its vibration with the vibration of a stretched string. The other devices are not used for this measurement.

1619. A definite area or a space where some thermodynamic process takes place is known as?

• A. Thermodynamic system
• B. Thermodynamic cycle
• C. Thermodynamic process
• D. Thermodynamic law

Explanation: A thermodynamic system is the defined region or quantity of matter selected for study. A process describes a change in the system, while a cycle is a sequence returning it to its initial state.

1620. A moving object always possesses?

• A. Potential Energy
• B. Kinetic Energy
• C. Thermal energy
• D. Magnetic energy

Explanation: Motion gives an object kinetic energy, calculated as one-half its mass multiplied by the square of its speed. Potential energy may also be present, but it is not guaranteed merely by motion.