All Free Everyday Science MCQs with Answers

1691. 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.

1692. 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.

1693. 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.

1694. 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.

1695. 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.

1696. 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.

1697. 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.

1698. Why the colour of the Ocean appears blue?

• A. Because the sunlight falling on it is scattered.
• B. Because the sunlight falling on it is absorbed.
• C. Because the sunlight falling on it is refracted.
• D. Because the sunlight falling on it is reflected.Chemistry

Explanation: Water absorbs much of the red part of sunlight, while blue light is scattered back toward the observer more effectively, making deep ocean water appear blue. Reflection contributes to surface appearance but is not the main explanation here.

1699. The distance between the optical centre of a convex lens and its principal focus is called its_______?

• A. Focal Length
• B. Radius of Curvature
• C. Power
• D. Magnification

Explanation: The focal length is the distance from the optical centre of a lens to its principal focus. Radius of curvature refers to the curvature of a lens surface, not this centre-to-focus distance.

1700. A convex mirror always ___________ ?

• A. Forms a real image
• B. Forms a virtual image
• C. Forms an inverted image
• D. Produces a larger image

Explanation: A convex mirror always produces a virtual, upright, and diminished image because reflected rays diverge and only appear to come from behind the mirror. It therefore does not form a real or enlarged image for an ordinary object.