All Free Analytical and Logical Reasoning MCQs with Answers

• A. Men do not take care of their eyes well enough
• B. Men spend more time in front of digital screens than women
• C. Color blindness is a sex-linked genetic disorder
• D. Men usually aren't able to distinguish between colors due to some circuitry in their right hemisphere of the brain

Explanation: Color blindness is more common in males because it is a sex-linked genetic disorder primarily associated with the X chromosome.

• A. Lactic acid bacteria
• B. Bacillus radicicola
• C. Lactobacillus aureus
• D. Lactobacillus acidophilus

Explanation: Curd may contain a wide variety of bacteria like Lactobacillus acidophilus, Lactococcus lactis, Lactococcus lactis cremoris, etc.

• A. During sunset, the sun's rays travel through more atmosphere, scattering shorter wavelengths and leaving red light to dominate.
• B. The Sun emits different colors from different areas, and at sunset, we see the red part.
• C. The Sun's nuclear reactions change intensity at sunset, altering its color to red.
• D. Plants emit red pigments at sunset, which color the sky red.

Explanation: The Sun appears red at sunset and sunrise due to the scattering of light in the Earth's atmosphere.

• A. 5.2 million billion metric tons
• B. 12 billion kilograms
• C. 1000 kilograms
• D. The sky does not have weight

Explanation: The correct answer is that the sky, or more accurately the Earth's atmosphere, weighs approximately 5.2 million billion metric tons.

• A. 7 billion kg
• B. 320 billion kg
• C. 320 million kg
• D. 2 billion kg

Explanation: The total weight of all humans on Earth can be calculated by multiplying the average weight of a person, 40 kg, by the global population…

• A. Fructose
• B. Lactose
• C. Sucrose
• D. Dextrose

Explanation: DFructose is present in honey which is sweeter than sucrose present in corn syrup or cane sugar

• A. Meat from mountainous animals is stronger than animals on the ground level.
• B. The boiling point of water is lower at higher altitudes.
• C. Pathogens and pollutants in urban cities cause the meat to rot a bit before we begin to cook it.
• D. None of the above

Explanation: Because water boils at a lower temperature at higher elevations, foods that are prepared by boiling or simmering will cook at a lower…

• A. To prevent someone from bumping into them and hurting themselves
• B. So that the cool air can efficiently circulate and cool the entire room
• C. To set up convection currents to cool the room since the cool air is denser and settles down
• D. It's just a standard, you can place the units anywhere you like

Explanation: Air-conditioning units are installed on the upper side of a room to facilitate effective cooling through convection currents.

• A. Water has a high specific heat capacity so does not heat up or cool down easily.
• B. Water reflects more light than buildings and land
• C. Water evaporates to give cloud cover
• D. Water extinguishes the Sun.

Explanation: The high heat capacity of water also explains why the temperatures of land near a body of water are more moderate.

• A. Aquatic organisms produce antifreeze proteins that prevent their bodies from freezing.
• B. In water bodies, the top layer freezes, forming an insulating layer, allowing aquatic life to survive beneath it.
• C. Aquatic life migrates to warmer parts of the water body to escape freezing temperatures.
• D. They perish in winter but leave behind resilient eggs to hatch in spring.

Explanation: The correct answer is that only the top layer of a water body freezes, creating an insulating barrier that keeps the water below from…

• A. The greenhouse effect is named for the environmental goal of planting more trees to combat global warming.
• B. The greenhouse effect is named because it describes the process by which greenhouse gases trap heat, similar to how a greenhouse's glass structure traps heat.
• C. The term was coined by a scientist who had a preference for the color green.
• D. None of the above options accurately describes the origin of the term 'greenhouse effect.'

Explanation: The term 'greenhouse effect' is used because Earth's atmosphere acts in a manner similar to a greenhouse.

• A. The fast-moving train creates a strong air pressure that can pull you towards it, risking serious injury.
• B. The train's speed might make you feel dizzy, potentially causing you to faint.
• C. Objects falling from the train could hit you due to the train's high velocity, causing injury.
• D. There is no real danger; it's just a safety guideline.

Explanation: When you stand close to a fast-moving train, the train's rapid movement creates a lower air pressure between the train and the person…

• A. The slippery nature of the soap causes the germs to slip off
• B. The soap traps germs and dirt and is washed off with them
• C. The soap disintegrates grease on the skin due to its non-polar tail
• D. The soap produces free radicals which destroy the germs on our hands

Explanation: Soap works through its molecular structure, which consists of a hydrophobic (non-polar) tail and a hydrophilic head.

• A. Heated in a vacuum
• B. Distilled from a solution
• C. Reacts with a liquid
• D. Melted

Explanation: The assembled apparatus is specifically used for a reaction where a solid reacts with a liquid, producing a gas that is subsequently…

• A. 30 degrees
• B. As less of an angle as possible
• C. 45 degrees
• D. 90 degrees

Explanation: The range (x) for an angle theta is given by the following: For x to be the largest, cos θ sinθ should be the largest.

• A. 1
• B. 2
• C. 3
• D. 4

Explanation: The ball moves in a tangential direction when released because the centripetal force is no longer acting on it.

• A. Nuclear fission
• B. Condensation
• C. Reduction
• D. Combustion

Explanation: Nuclear fission involves the greatest change in energy as indicated by the amount of energy released which is used to run nuclear power…

• A. Removing sodium chloride from water
• B. Boiling water
• C. Lighting a matchstick
• D. Increasing the height of a ball from the ground to an elevated table

Explanation: A spontaneous reaction is one that proceeds on its own once initiated. Lighting a matchstick is spontaneous after the initial ignition…

• A. Dust sticks to the rust in fans
• B. The momentum of the fan is so high that the dust particles which have low inertia are instantly caught in the motion of the blades and adopt the motion of the blades
• C. The dust settles in and sticks to fans when they are not moving
• D. The electrostatically charged fan blades attract dust particles

Explanation: The correct answer is that the electrostatically charged fan blades attract dust particles.

• A. III>I>IV>II
• B. II>III>IV>I
• C. I>III>IV>II
• D. I>II>III>IV

Explanation: To obtain dry iron, we first hold a magnet above the mixture. We then mix the remaining salt and sand into water.