All Free Everyday Science MCQs with Answers

1551. Which of the following phenomena of light are involved in the formation of a rainbow?

• A. Refraction
• B. Dispersion
• C. Total internal reflection
• D. All of the above

Explanation: Rainbows form when sunlight is refracted and dispersed into colours inside raindrops, then undergoes internal reflection before being refracted again as it exits. Thus all three listed optical effects are involved.

1552. What colour is called magenta?

• A. Black
• B. White
• C. Yellow
• D. Reddish-Purple

Explanation: Magenta is a purplish-red colour produced by combining red and blue light or pigments. It is not one of the basic black, white, or yellow choices listed.

1553. A Cheetah can accelerate to 100 kmph in just__________.

• A. 3 seconds
• B. 6 seconds
• C. 9 seconds
• D. 12 seconds

Explanation: A cheetah can reach about 100 km/h from rest in roughly three seconds, making its acceleration exceptional among land animals. The longer times listed are less consistent with its famous short sprint acceleration.

1554. Natural Radioactivity was discovered by Becquerel in ____________?

• A. 1766
• B. 1896
• C. 1935
• D. 2001

Explanation: Henri Becquerel discovered natural radioactivity in 1896 while studying uranium salts. His observation preceded the later work of Marie and Pierre Curie.

1555. Rainbow is seen after rain because of hanging molecules of water which act as __________?

• A. Lens
• B. Prism
• C. Mirror
• D. Slabs

Explanation: Raindrops disperse sunlight by refraction, internal reflection, and refraction again, acting approximately like tiny prisms. This separates white sunlight into the colours of a rainbow.

1556. The frequency of ultrasound wave is typically?

• A. Above 20 kHz
• B. Above 20,000 kHz
• C. Below 20 kHz
• D. Below 02 kHz

Explanation: Ultrasound consists of sound waves above the upper human hearing limit of about 20 kHz. Frequencies below 20 kHz are generally within the audible range for humans.

1557. Kinetics is the study of________.

• A. Motion and its causes
• B. Force and energy
• C. Friction
• D. Heat and temperature

Explanation: Kinetics studies motion together with the forces and torques that cause or change it. Kinematics describes motion without considering its causes, which is the common distinction.

1558. An optical instrument which is used measure the properties of visible light is called?

• A. Microscope
• B. Telescope
• C. Spectroscope
• D. Oscilloscope

Explanation: A spectroscope separates or analyses visible light according to wavelength, revealing a spectrum and often identifying substances from their lines. A microscope magnifies small objects, while a telescope collects light from distant objects.

1559. Which of the following lens are useful in microscope?

• A. Convex lens
• B. Concave lens
• C. Curved lens
• D. None of These

Explanation: A compound microscope uses convex lenses because they converge light and produce magnified images. Concave lenses diverge light and are not used as the main magnifying lenses in an ordinary microscope.

1560. Elastic rebound theory explains:

• A. formation of rocks
• B. structure of solids
• C. causes of earthquake
• D. None of these

Explanation: Elastic rebound theory states that rocks deform under tectonic stress and suddenly snap back when the stress exceeds their strength, releasing energy as an earthquake. It therefore explains the cause and energy release of earthquakes.