Latest Science and Technology General Knowledge(GK) Questions and answers

1 .

Through which microscope were cells first observed?

A)

Electron

B)

Compound

C)

Simple

D)

Tunneling

Correct Answer : Option (B) - Compound

A microscope is an instrument that magnifies objects. Cells that were first observed by Robert Hooke in the year 1665 in the compound microscope.

2 .

Which one of the following statements with regard to the winter solstice is correct?

A)

It occurs on June 21.

B)

The Sun is at aphelion.

C)

The South Pole experiences 24 hours of darkness.

D)

The North Pole experiences 24 hours of darkness.

Correct Answer : Option (D) - The North Pole experiences 24 hours of darkness.

On December 21, the earth is in an equivalent position on the opposite points in its orbit, So the South pole is tipped towards the sun and North pole away from it resulting in 24 hours of darkness at the North pole, as the sun is overhead on the Tropic of Capricorn. This phenomenon is winter solstice; while on June 21, North pole is tipped towards the Sun but the South pole is tipped away from the sun resulting in 24 hours of darkness on the South Pole, as the sun is overhead on the Tropic of Cancer.This phenomenon is summer solstice; while Aphelion is the position of the earth in its orbit when it is at its distant point from the sun.

3 .

Which is an example of an endothermic reaction?

A)

Photosynthesis

B)

Combustion

C)

Coal is burnt

D)

Mix of CaO with water

Correct Answer : Option (A) - Photosynthesis

A chemical reaction in which involves the absorption of heat from the environment is called a Endothermic reaction.

Examples : Dissolving ammonium chloride in water, photosynthesis, melting ice cubes, mixing of potassium chloride with water,...

In the contrast, chemical reactions involving release of heat are known as exothermic reactions.

Examples : Combustion, coal is burnt, mix of CaO with water,...

4 .

Which is an example of a physical change?

A)

Breaking glass

B)

Melting of ice

C)

Dissolving sugar in water

D)

All of the above

Correct Answer : Option (D) - All of the above

In all the above given options, there is no chemical change or reactions takes place only the shape or physical state is changed.

5 .

As water is cooled from 4 deg C to 0 deg C, its density

A)

remains same

B)

zero

C)

decreases

D)

increases

Correct Answer : Option (C) - decreases

When water is cooled from 4°C to 0°C, its density decreases.

When water cools from 4°C to 0°C, ice crystals begin to form because the water is approaching its freezing point. When water freezes, the water molecules form a lattice that increases the volume. As a result, the density decreases. This is why ice will float on top of water; ice has a lower density than the water.

6 .

Where does transcription occur in the cell?

A)

Ribosome

B)

Nucleus

C)

Cytoplasm

D)

None of the above

Correct Answer : Option (B) - Nucleus

Transcription is a process of production of mRNA which occurs in the nucleus of the cell. After transcription, translation which occurs in the cytoplasm.

7 .

Why does a black board appears black in colour?

A)

It absorbs black colour

B)

It reflects black colour

C)

It absorbs all the colours

D)

It reflects all colours

Correct Answer : Option (C) - It absorbs all the colours

Actually a black board has all colours in light or white light . So when light falls on it board absorbs all colours because all are present so no light is reflected back . That is the case when board has all colours and so it will appear black as it absorbs all colours of light that fall on it.

8 .

One who eats everything

A)

Omnivores

B)

Omniscient

C)

Herbivores

D)

Carnivores

Correct Answer : Option (A) - Omnivores

One the person or a animal who eats everything i.e, no kind of food is refused are called as Omnivores.

9 .

Common alcoholic beverages include

A)

Wine

B)

Beer

C)

brandy

D)

All of the above

Correct Answer : Option (D) - All of the above

Alcoholic beverages comprise a large group of beverages that contain varying amounts of alcohol (ethanol). Alcoholic beverages produced on an industrial scale include beer, wine, and China rice wine, and distilled spirits such as brandy, whisky, rum, gin, cognac, vodka, tequila, pisco, and China distilled spirit.

10 .

The diploid generation of the plant life cycle always

A)

Is called the gametophyte

B)

produces eggs and sperm

C)

develops from a spore

D)

produces spores

Correct Answer : Option (D) - produces spores