Free Physics in Daily Life MCQs with Answers

211. Water is 50 times more viscous than ____________ ?

• A. Oil
• B. Alcohol
• C. Gases
• D. Solid

Explanation: Water is roughly 50 to 55 times more viscous than air at room temperature, so gases is the intended comparison. Liquids such as oil are generally more viscous than water, not less by this ratio.

212. Newton's Third Law of Motion?

• A. every action there is an equal and opposite reaction.
• B. attraction or repulsion between two charges
• C. volume of a given mass of gas increases or decreases
• D. temperature remaining constant, volume of a given mass of a gas varies inversely

Explanation: Newton’s third law states that interacting bodies exert forces on each other that are equal in magnitude and opposite in direction. The other statements refer to electrostatic force or gas laws, not motion’s third law.

213. Oil rises up to wick in a lamp because_____________?

• A. Oil is very light
• B. Oil is volatile
• C. Diffusion of oil through the wick
• D. Capillary action phenomenon

Explanation: Liquid oil climbs through the narrow pores of a wick because of capillary action, produced by adhesion to the wick and cohesion within the oil. Its lightness or volatility is not the cause.

214. The discovery of neutron became very late because _______ ?

• A. It does not carry any charge
• B. It does not move
• C. It is a fundamental particle
• D. It is present in nucleus

Explanation: The neutron was difficult to detect because it has no electric charge and therefore does not respond directly to electric or magnetic fields. Its presence in the nucleus was established only after indirect experiments.

215. The absolute value of charge on electron was determined by ________ ?

• A. J.J.Thomson
• B. Chadwick
• C. Rutherford
• D. Robert Millikan

Explanation: Robert Millikan determined the electron's charge magnitude through his oil-drop experiment. J. J. Thomson measured the charge-to-mass ratio, not the absolute charge alone.

216. The M.K.S. system was first introduced by _________ ?

• A. Giorgi
• B. Archimedes
• C. Eienstein
• D. Newton

Explanation: The MKS system, based on metre, kilogram and second, was introduced by Giovanni Giorgi. It later formed the foundation of the SI system when electrical units were added.

217. Hydrogen bomb is based on the principle of ________ ?

• A. Nuclear fusion
• B. Artificial radioactivity
• C. Natural radioactivity
• D. Nuclear fission

Explanation: A hydrogen bomb releases energy through nuclear fusion, in which light hydrogen nuclei combine to form heavier nuclei. Nuclear fission may be used as a trigger, but it is not the main principle of the hydrogen bomb.

218. During rainy season Wooden doors are difficult to open or closure because of ________ ?

• A. Plasmolysis
• B. Imbibition
• C. Osmosis
• D. Diffusion

Explanation: Wood absorbs moisture from humid air and swells, making a rainy-season door tight in its frame. This swelling by absorption is commonly described as imbibition, not osmosis or plasmolysis.

219. What is the photometer?

• A. Testing picture Quality
• B. Measuring light Intensity
• C. Measuring Size of Picture
• D. Checking colors and Pictures

Explanation: A photometer measures the intensity or brightness of light. It is different from a camera or colorimeter, which may assess images or colors.

220. What type of a mirror is used in anti-shop-lifting-devices?

• A. Convex mirror
• B. Concave mirror
• C. Plane mirror
• D. Both (b) and (c)

Explanation: Convex mirrors provide a wide field of view, allowing one device to monitor a larger shop area. They form upright, virtual, and reduced images, which is useful for surveillance.