Question

Match the following columns and select the correct option from the codes given below.

Column 1	Column 2
i. Pressure	p. pattern formed due to multiple reflections
ii. Decibels	q. unit of loudness
iii. Richter	r. force per unit area
iv. Kaleidoscope	s. scale to measure the intensity of an earthquake

A. (i) (r), (ii) (q), (iii) (s), (iv) (p)
B. (i) (q), (ii) (p), (iii) (s), (iv) (r)
C. (i) (p), (ii) (s), (iii) (r), (iv) (q)
D. (i) (q), (ii) (r), (iii) (s), (iv) (p)

Answer 1

Hint:
The International Standard unit of pressure is Pascal.
The maximum value ever recorded on a Richter scale is 9.5 in 1960.
Kaleidoscope is an optical instrument

Complete answer:
Pressure is defined as the force applied perpendicular to the surface on which it is applied. The International Standard unit of pressure is Pascal. Mathematically it is expressed as P = F/A, where P is the pressure, F is the force and A is the area on which the force is applied.
Decibels are the unit of measurement of loudness. The higher the decibel the louder is the sound. It is denoted as ‘dB’. A normal conversation is at around 60dB. Any sound which is louder than 85 dB is considered to be harmful.
Richter scale is a scale used to measure the intensity of an earthquake. It was developed by Charles Richter in 1935. The units on the Richter Scale is corresponding to the increase in amplitude by a factor of 10, thus making it a logarithmic scale. The maximum value ever recorded on a Richter scale is 9.5 in 1960. No earthquake has ever reached the mark of 10 on the scale.
Kaleidoscope is an optical instrument. It has two or more mirrors and some materials inside it. The materials inside the kaleidoscope move and form different patterns with its reflection. These patterns are always changing and they never repeat. It is a source of ideas for artists and designers. It was invented by David Brewster in Scotland, 1817.

Therefore the correct answer is A

Note
The most devastating earthquake in India was the one that occurred in Bihar on January 15, 1934. The magnitude recorded was 8.1 on the Richter scale.
The epicentre of the earthquake was located in eastern Nepal.
The intensity of the earthquake was so strong that its effect was felt in Kolkata-650 km from the epicentre.