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

1 .

The bright colour of fire crackers is due to

A)

Redox reaction

B)

Explosion of metal

C)

Reduction of Magnesium

D)

Oxidation of Magnesium

Correct Answer : Oxidation of Magnesium

2 .

Which type of chemical process is tarnishing of silver ?

A)

Corrosion

B)

Oxidation

C)

Cleaning

D)

Neutralization

Correct Answer : Corrosion

3 .

What is the name of the instrument used to record and measure ionizing radiation in human beings

A)

Radiometer

B)

Dosimeter

C)

Geiger Counter

D)

Ionization Chamber

Correct Answer : Dosimeter

A Geiger counter is an instrument used for detecting and measuring ionizing radiation. Also known as a Geiger–Müller counter (or Geiger–Muller counter), it is widely used in applications such as radiation dosimetry, radiological protection, experimental physics, and the nuclear industry.

4 .

Eclipses occur due to which optical phenomena

A)

Diffraction

B)

Refraction

C)

Reflection

D)

Rectilinear propagation

Correct Answer : Rectilinear propagation

5 .

At what temperature (in Fahrenheit) pure water freezes

A)

0

B)

16

C)

32

D)

64

Correct Answer : 32

At temperatures below 32°F (0°C), liquid water freezes; 32°F (0°C) is the freezing point of water. At temperatures above 32°F (0°C), pure water ice melts and changes state from a solid to a liquid (water); 32°F (0°C) is the melting point.

6 .

X-ray was discovered by

A)

William Crookes

B)

Wilhelm Roentgen

C)

Philipp Lenard

D)

Max von Laue

Correct Answer : Wilhelm Roentgen

Wilhelm Roentgen, Professor of Physics in Wurzburg, Bavaria, discovered X-rays in 1895—accidentally—while testing whether cathode rays could pass through glass.

7 .

Microbial degradation of nitrates into atmospheric nitogen is known as

A)

Denitrification

B)

Ammonification

C)

Nitrification

D)

Putrefacation

Correct Answer : Denitrification

8 .

A time series graph is also known as

A)

Ogive

B)

Histogram

C)

Bar diagram

D)

Frequency polygon

Correct Answer : Histogram

9 .

The group of stars arranged in a definite pattern is called

A)

Andromeda

B)

Milky way

C)

Solar system

D)

Constellation

Correct Answer : Constellation

The patterns of stars seen in the sky are usually called constellations, although more acurately, a group of stars that forms a pattern in the sky is called an asterism. ... Astronomers use the term constellation to refer to an area of the sky.

10 .

Which of the following gets deficient in the human body due to Dengue fever

A)

Haemoglobin

B)

Platelets

C)

Water

D)

Sugar

Correct Answer : Platelets